mirror of https://gitee.com/openkylin/linux.git
4015 lines
111 KiB
C
4015 lines
111 KiB
C
/*
|
|
* Copyright © 2014 Red Hat
|
|
*
|
|
* Permission to use, copy, modify, distribute, and sell this software and its
|
|
* documentation for any purpose is hereby granted without fee, provided that
|
|
* the above copyright notice appear in all copies and that both that copyright
|
|
* notice and this permission notice appear in supporting documentation, and
|
|
* that the name of the copyright holders not be used in advertising or
|
|
* publicity pertaining to distribution of the software without specific,
|
|
* written prior permission. The copyright holders make no representations
|
|
* about the suitability of this software for any purpose. It is provided "as
|
|
* is" without express or implied warranty.
|
|
*
|
|
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
|
|
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
|
|
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
|
|
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
|
|
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
|
|
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
|
|
* OF THIS SOFTWARE.
|
|
*/
|
|
|
|
#include <linux/delay.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/seq_file.h>
|
|
|
|
#include <drm/drm_atomic.h>
|
|
#include <drm/drm_atomic_helper.h>
|
|
#include <drm/drm_dp_mst_helper.h>
|
|
#include <drm/drm_drv.h>
|
|
#include <drm/drm_fixed.h>
|
|
#include <drm/drm_print.h>
|
|
#include <drm/drm_probe_helper.h>
|
|
|
|
/**
|
|
* DOC: dp mst helper
|
|
*
|
|
* These functions contain parts of the DisplayPort 1.2a MultiStream Transport
|
|
* protocol. The helpers contain a topology manager and bandwidth manager.
|
|
* The helpers encapsulate the sending and received of sideband msgs.
|
|
*/
|
|
static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
|
|
char *buf);
|
|
static int test_calc_pbn_mode(void);
|
|
|
|
static void drm_dp_mst_topology_put_port(struct drm_dp_mst_port *port);
|
|
|
|
static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
|
|
int id,
|
|
struct drm_dp_payload *payload);
|
|
|
|
static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_port *port,
|
|
int offset, int size, u8 *bytes);
|
|
|
|
static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_branch *mstb);
|
|
static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_branch *mstb,
|
|
struct drm_dp_mst_port *port);
|
|
static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
|
|
u8 *guid);
|
|
|
|
static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux);
|
|
static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux);
|
|
static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr);
|
|
|
|
#define DP_STR(x) [DP_ ## x] = #x
|
|
|
|
static const char *drm_dp_mst_req_type_str(u8 req_type)
|
|
{
|
|
static const char * const req_type_str[] = {
|
|
DP_STR(GET_MSG_TRANSACTION_VERSION),
|
|
DP_STR(LINK_ADDRESS),
|
|
DP_STR(CONNECTION_STATUS_NOTIFY),
|
|
DP_STR(ENUM_PATH_RESOURCES),
|
|
DP_STR(ALLOCATE_PAYLOAD),
|
|
DP_STR(QUERY_PAYLOAD),
|
|
DP_STR(RESOURCE_STATUS_NOTIFY),
|
|
DP_STR(CLEAR_PAYLOAD_ID_TABLE),
|
|
DP_STR(REMOTE_DPCD_READ),
|
|
DP_STR(REMOTE_DPCD_WRITE),
|
|
DP_STR(REMOTE_I2C_READ),
|
|
DP_STR(REMOTE_I2C_WRITE),
|
|
DP_STR(POWER_UP_PHY),
|
|
DP_STR(POWER_DOWN_PHY),
|
|
DP_STR(SINK_EVENT_NOTIFY),
|
|
DP_STR(QUERY_STREAM_ENC_STATUS),
|
|
};
|
|
|
|
if (req_type >= ARRAY_SIZE(req_type_str) ||
|
|
!req_type_str[req_type])
|
|
return "unknown";
|
|
|
|
return req_type_str[req_type];
|
|
}
|
|
|
|
#undef DP_STR
|
|
#define DP_STR(x) [DP_NAK_ ## x] = #x
|
|
|
|
static const char *drm_dp_mst_nak_reason_str(u8 nak_reason)
|
|
{
|
|
static const char * const nak_reason_str[] = {
|
|
DP_STR(WRITE_FAILURE),
|
|
DP_STR(INVALID_READ),
|
|
DP_STR(CRC_FAILURE),
|
|
DP_STR(BAD_PARAM),
|
|
DP_STR(DEFER),
|
|
DP_STR(LINK_FAILURE),
|
|
DP_STR(NO_RESOURCES),
|
|
DP_STR(DPCD_FAIL),
|
|
DP_STR(I2C_NAK),
|
|
DP_STR(ALLOCATE_FAIL),
|
|
};
|
|
|
|
if (nak_reason >= ARRAY_SIZE(nak_reason_str) ||
|
|
!nak_reason_str[nak_reason])
|
|
return "unknown";
|
|
|
|
return nak_reason_str[nak_reason];
|
|
}
|
|
|
|
#undef DP_STR
|
|
|
|
/* sideband msg handling */
|
|
static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles)
|
|
{
|
|
u8 bitmask = 0x80;
|
|
u8 bitshift = 7;
|
|
u8 array_index = 0;
|
|
int number_of_bits = num_nibbles * 4;
|
|
u8 remainder = 0;
|
|
|
|
while (number_of_bits != 0) {
|
|
number_of_bits--;
|
|
remainder <<= 1;
|
|
remainder |= (data[array_index] & bitmask) >> bitshift;
|
|
bitmask >>= 1;
|
|
bitshift--;
|
|
if (bitmask == 0) {
|
|
bitmask = 0x80;
|
|
bitshift = 7;
|
|
array_index++;
|
|
}
|
|
if ((remainder & 0x10) == 0x10)
|
|
remainder ^= 0x13;
|
|
}
|
|
|
|
number_of_bits = 4;
|
|
while (number_of_bits != 0) {
|
|
number_of_bits--;
|
|
remainder <<= 1;
|
|
if ((remainder & 0x10) != 0)
|
|
remainder ^= 0x13;
|
|
}
|
|
|
|
return remainder;
|
|
}
|
|
|
|
static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes)
|
|
{
|
|
u8 bitmask = 0x80;
|
|
u8 bitshift = 7;
|
|
u8 array_index = 0;
|
|
int number_of_bits = number_of_bytes * 8;
|
|
u16 remainder = 0;
|
|
|
|
while (number_of_bits != 0) {
|
|
number_of_bits--;
|
|
remainder <<= 1;
|
|
remainder |= (data[array_index] & bitmask) >> bitshift;
|
|
bitmask >>= 1;
|
|
bitshift--;
|
|
if (bitmask == 0) {
|
|
bitmask = 0x80;
|
|
bitshift = 7;
|
|
array_index++;
|
|
}
|
|
if ((remainder & 0x100) == 0x100)
|
|
remainder ^= 0xd5;
|
|
}
|
|
|
|
number_of_bits = 8;
|
|
while (number_of_bits != 0) {
|
|
number_of_bits--;
|
|
remainder <<= 1;
|
|
if ((remainder & 0x100) != 0)
|
|
remainder ^= 0xd5;
|
|
}
|
|
|
|
return remainder & 0xff;
|
|
}
|
|
static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr)
|
|
{
|
|
u8 size = 3;
|
|
size += (hdr->lct / 2);
|
|
return size;
|
|
}
|
|
|
|
static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr,
|
|
u8 *buf, int *len)
|
|
{
|
|
int idx = 0;
|
|
int i;
|
|
u8 crc4;
|
|
buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf);
|
|
for (i = 0; i < (hdr->lct / 2); i++)
|
|
buf[idx++] = hdr->rad[i];
|
|
buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) |
|
|
(hdr->msg_len & 0x3f);
|
|
buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4);
|
|
|
|
crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1);
|
|
buf[idx - 1] |= (crc4 & 0xf);
|
|
|
|
*len = idx;
|
|
}
|
|
|
|
static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr,
|
|
u8 *buf, int buflen, u8 *hdrlen)
|
|
{
|
|
u8 crc4;
|
|
u8 len;
|
|
int i;
|
|
u8 idx;
|
|
if (buf[0] == 0)
|
|
return false;
|
|
len = 3;
|
|
len += ((buf[0] & 0xf0) >> 4) / 2;
|
|
if (len > buflen)
|
|
return false;
|
|
crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1);
|
|
|
|
if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) {
|
|
DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]);
|
|
return false;
|
|
}
|
|
|
|
hdr->lct = (buf[0] & 0xf0) >> 4;
|
|
hdr->lcr = (buf[0] & 0xf);
|
|
idx = 1;
|
|
for (i = 0; i < (hdr->lct / 2); i++)
|
|
hdr->rad[i] = buf[idx++];
|
|
hdr->broadcast = (buf[idx] >> 7) & 0x1;
|
|
hdr->path_msg = (buf[idx] >> 6) & 0x1;
|
|
hdr->msg_len = buf[idx] & 0x3f;
|
|
idx++;
|
|
hdr->somt = (buf[idx] >> 7) & 0x1;
|
|
hdr->eomt = (buf[idx] >> 6) & 0x1;
|
|
hdr->seqno = (buf[idx] >> 4) & 0x1;
|
|
idx++;
|
|
*hdrlen = idx;
|
|
return true;
|
|
}
|
|
|
|
static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req,
|
|
struct drm_dp_sideband_msg_tx *raw)
|
|
{
|
|
int idx = 0;
|
|
int i;
|
|
u8 *buf = raw->msg;
|
|
buf[idx++] = req->req_type & 0x7f;
|
|
|
|
switch (req->req_type) {
|
|
case DP_ENUM_PATH_RESOURCES:
|
|
buf[idx] = (req->u.port_num.port_number & 0xf) << 4;
|
|
idx++;
|
|
break;
|
|
case DP_ALLOCATE_PAYLOAD:
|
|
buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 |
|
|
(req->u.allocate_payload.number_sdp_streams & 0xf);
|
|
idx++;
|
|
buf[idx] = (req->u.allocate_payload.vcpi & 0x7f);
|
|
idx++;
|
|
buf[idx] = (req->u.allocate_payload.pbn >> 8);
|
|
idx++;
|
|
buf[idx] = (req->u.allocate_payload.pbn & 0xff);
|
|
idx++;
|
|
for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) {
|
|
buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) |
|
|
(req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf);
|
|
idx++;
|
|
}
|
|
if (req->u.allocate_payload.number_sdp_streams & 1) {
|
|
i = req->u.allocate_payload.number_sdp_streams - 1;
|
|
buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4;
|
|
idx++;
|
|
}
|
|
break;
|
|
case DP_QUERY_PAYLOAD:
|
|
buf[idx] = (req->u.query_payload.port_number & 0xf) << 4;
|
|
idx++;
|
|
buf[idx] = (req->u.query_payload.vcpi & 0x7f);
|
|
idx++;
|
|
break;
|
|
case DP_REMOTE_DPCD_READ:
|
|
buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4;
|
|
buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf;
|
|
idx++;
|
|
buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8;
|
|
idx++;
|
|
buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff);
|
|
idx++;
|
|
buf[idx] = (req->u.dpcd_read.num_bytes);
|
|
idx++;
|
|
break;
|
|
|
|
case DP_REMOTE_DPCD_WRITE:
|
|
buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4;
|
|
buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf;
|
|
idx++;
|
|
buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8;
|
|
idx++;
|
|
buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff);
|
|
idx++;
|
|
buf[idx] = (req->u.dpcd_write.num_bytes);
|
|
idx++;
|
|
memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes);
|
|
idx += req->u.dpcd_write.num_bytes;
|
|
break;
|
|
case DP_REMOTE_I2C_READ:
|
|
buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4;
|
|
buf[idx] |= (req->u.i2c_read.num_transactions & 0x3);
|
|
idx++;
|
|
for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) {
|
|
buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f;
|
|
idx++;
|
|
buf[idx] = req->u.i2c_read.transactions[i].num_bytes;
|
|
idx++;
|
|
memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes);
|
|
idx += req->u.i2c_read.transactions[i].num_bytes;
|
|
|
|
buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 5;
|
|
buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf);
|
|
idx++;
|
|
}
|
|
buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f;
|
|
idx++;
|
|
buf[idx] = (req->u.i2c_read.num_bytes_read);
|
|
idx++;
|
|
break;
|
|
|
|
case DP_REMOTE_I2C_WRITE:
|
|
buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4;
|
|
idx++;
|
|
buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f;
|
|
idx++;
|
|
buf[idx] = (req->u.i2c_write.num_bytes);
|
|
idx++;
|
|
memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes);
|
|
idx += req->u.i2c_write.num_bytes;
|
|
break;
|
|
|
|
case DP_POWER_DOWN_PHY:
|
|
case DP_POWER_UP_PHY:
|
|
buf[idx] = (req->u.port_num.port_number & 0xf) << 4;
|
|
idx++;
|
|
break;
|
|
}
|
|
raw->cur_len = idx;
|
|
}
|
|
|
|
static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len)
|
|
{
|
|
u8 crc4;
|
|
crc4 = drm_dp_msg_data_crc4(msg, len);
|
|
msg[len] = crc4;
|
|
}
|
|
|
|
static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep,
|
|
struct drm_dp_sideband_msg_tx *raw)
|
|
{
|
|
int idx = 0;
|
|
u8 *buf = raw->msg;
|
|
|
|
buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f);
|
|
|
|
raw->cur_len = idx;
|
|
}
|
|
|
|
/* this adds a chunk of msg to the builder to get the final msg */
|
|
static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg,
|
|
u8 *replybuf, u8 replybuflen, bool hdr)
|
|
{
|
|
int ret;
|
|
u8 crc4;
|
|
|
|
if (hdr) {
|
|
u8 hdrlen;
|
|
struct drm_dp_sideband_msg_hdr recv_hdr;
|
|
ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen);
|
|
if (ret == false) {
|
|
print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false);
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* ignore out-of-order messages or messages that are part of a
|
|
* failed transaction
|
|
*/
|
|
if (!recv_hdr.somt && !msg->have_somt)
|
|
return false;
|
|
|
|
/* get length contained in this portion */
|
|
msg->curchunk_len = recv_hdr.msg_len;
|
|
msg->curchunk_hdrlen = hdrlen;
|
|
|
|
/* we have already gotten an somt - don't bother parsing */
|
|
if (recv_hdr.somt && msg->have_somt)
|
|
return false;
|
|
|
|
if (recv_hdr.somt) {
|
|
memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr));
|
|
msg->have_somt = true;
|
|
}
|
|
if (recv_hdr.eomt)
|
|
msg->have_eomt = true;
|
|
|
|
/* copy the bytes for the remainder of this header chunk */
|
|
msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen));
|
|
memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx);
|
|
} else {
|
|
memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen);
|
|
msg->curchunk_idx += replybuflen;
|
|
}
|
|
|
|
if (msg->curchunk_idx >= msg->curchunk_len) {
|
|
/* do CRC */
|
|
crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1);
|
|
/* copy chunk into bigger msg */
|
|
memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1);
|
|
msg->curlen += msg->curchunk_len - 1;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw,
|
|
struct drm_dp_sideband_msg_reply_body *repmsg)
|
|
{
|
|
int idx = 1;
|
|
int i;
|
|
memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16);
|
|
idx += 16;
|
|
repmsg->u.link_addr.nports = raw->msg[idx] & 0xf;
|
|
idx++;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
for (i = 0; i < repmsg->u.link_addr.nports; i++) {
|
|
if (raw->msg[idx] & 0x80)
|
|
repmsg->u.link_addr.ports[i].input_port = 1;
|
|
|
|
repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7;
|
|
repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf);
|
|
|
|
idx++;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1;
|
|
repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1;
|
|
if (repmsg->u.link_addr.ports[i].input_port == 0)
|
|
repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1;
|
|
idx++;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
if (repmsg->u.link_addr.ports[i].input_port == 0) {
|
|
repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]);
|
|
idx++;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16);
|
|
idx += 16;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf;
|
|
repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf);
|
|
idx++;
|
|
|
|
}
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
}
|
|
|
|
return true;
|
|
fail_len:
|
|
DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);
|
|
return false;
|
|
}
|
|
|
|
static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw,
|
|
struct drm_dp_sideband_msg_reply_body *repmsg)
|
|
{
|
|
int idx = 1;
|
|
repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf;
|
|
idx++;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx];
|
|
idx++;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
|
|
memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes);
|
|
return true;
|
|
fail_len:
|
|
DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen);
|
|
return false;
|
|
}
|
|
|
|
static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw,
|
|
struct drm_dp_sideband_msg_reply_body *repmsg)
|
|
{
|
|
int idx = 1;
|
|
repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf;
|
|
idx++;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
return true;
|
|
fail_len:
|
|
DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen);
|
|
return false;
|
|
}
|
|
|
|
static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw,
|
|
struct drm_dp_sideband_msg_reply_body *repmsg)
|
|
{
|
|
int idx = 1;
|
|
|
|
repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf);
|
|
idx++;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx];
|
|
idx++;
|
|
/* TODO check */
|
|
memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes);
|
|
return true;
|
|
fail_len:
|
|
DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen);
|
|
return false;
|
|
}
|
|
|
|
static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw,
|
|
struct drm_dp_sideband_msg_reply_body *repmsg)
|
|
{
|
|
int idx = 1;
|
|
repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf;
|
|
idx++;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
|
|
idx += 2;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
|
|
idx += 2;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
return true;
|
|
fail_len:
|
|
DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen);
|
|
return false;
|
|
}
|
|
|
|
static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw,
|
|
struct drm_dp_sideband_msg_reply_body *repmsg)
|
|
{
|
|
int idx = 1;
|
|
repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf;
|
|
idx++;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
repmsg->u.allocate_payload.vcpi = raw->msg[idx];
|
|
idx++;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]);
|
|
idx += 2;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
return true;
|
|
fail_len:
|
|
DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen);
|
|
return false;
|
|
}
|
|
|
|
static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw,
|
|
struct drm_dp_sideband_msg_reply_body *repmsg)
|
|
{
|
|
int idx = 1;
|
|
repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf;
|
|
idx++;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);
|
|
idx += 2;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
return true;
|
|
fail_len:
|
|
DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen);
|
|
return false;
|
|
}
|
|
|
|
static bool drm_dp_sideband_parse_power_updown_phy_ack(struct drm_dp_sideband_msg_rx *raw,
|
|
struct drm_dp_sideband_msg_reply_body *repmsg)
|
|
{
|
|
int idx = 1;
|
|
|
|
repmsg->u.port_number.port_number = (raw->msg[idx] >> 4) & 0xf;
|
|
idx++;
|
|
if (idx > raw->curlen) {
|
|
DRM_DEBUG_KMS("power up/down phy parse length fail %d %d\n",
|
|
idx, raw->curlen);
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw,
|
|
struct drm_dp_sideband_msg_reply_body *msg)
|
|
{
|
|
memset(msg, 0, sizeof(*msg));
|
|
msg->reply_type = (raw->msg[0] & 0x80) >> 7;
|
|
msg->req_type = (raw->msg[0] & 0x7f);
|
|
|
|
if (msg->reply_type == DP_SIDEBAND_REPLY_NAK) {
|
|
memcpy(msg->u.nak.guid, &raw->msg[1], 16);
|
|
msg->u.nak.reason = raw->msg[17];
|
|
msg->u.nak.nak_data = raw->msg[18];
|
|
return false;
|
|
}
|
|
|
|
switch (msg->req_type) {
|
|
case DP_LINK_ADDRESS:
|
|
return drm_dp_sideband_parse_link_address(raw, msg);
|
|
case DP_QUERY_PAYLOAD:
|
|
return drm_dp_sideband_parse_query_payload_ack(raw, msg);
|
|
case DP_REMOTE_DPCD_READ:
|
|
return drm_dp_sideband_parse_remote_dpcd_read(raw, msg);
|
|
case DP_REMOTE_DPCD_WRITE:
|
|
return drm_dp_sideband_parse_remote_dpcd_write(raw, msg);
|
|
case DP_REMOTE_I2C_READ:
|
|
return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg);
|
|
case DP_ENUM_PATH_RESOURCES:
|
|
return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg);
|
|
case DP_ALLOCATE_PAYLOAD:
|
|
return drm_dp_sideband_parse_allocate_payload_ack(raw, msg);
|
|
case DP_POWER_DOWN_PHY:
|
|
case DP_POWER_UP_PHY:
|
|
return drm_dp_sideband_parse_power_updown_phy_ack(raw, msg);
|
|
default:
|
|
DRM_ERROR("Got unknown reply 0x%02x (%s)\n", msg->req_type,
|
|
drm_dp_mst_req_type_str(msg->req_type));
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw,
|
|
struct drm_dp_sideband_msg_req_body *msg)
|
|
{
|
|
int idx = 1;
|
|
|
|
msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;
|
|
idx++;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
|
|
memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16);
|
|
idx += 16;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
|
|
msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1;
|
|
msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1;
|
|
msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1;
|
|
msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1;
|
|
msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7);
|
|
idx++;
|
|
return true;
|
|
fail_len:
|
|
DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen);
|
|
return false;
|
|
}
|
|
|
|
static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw,
|
|
struct drm_dp_sideband_msg_req_body *msg)
|
|
{
|
|
int idx = 1;
|
|
|
|
msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4;
|
|
idx++;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
|
|
memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16);
|
|
idx += 16;
|
|
if (idx > raw->curlen)
|
|
goto fail_len;
|
|
|
|
msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]);
|
|
idx++;
|
|
return true;
|
|
fail_len:
|
|
DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen);
|
|
return false;
|
|
}
|
|
|
|
static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw,
|
|
struct drm_dp_sideband_msg_req_body *msg)
|
|
{
|
|
memset(msg, 0, sizeof(*msg));
|
|
msg->req_type = (raw->msg[0] & 0x7f);
|
|
|
|
switch (msg->req_type) {
|
|
case DP_CONNECTION_STATUS_NOTIFY:
|
|
return drm_dp_sideband_parse_connection_status_notify(raw, msg);
|
|
case DP_RESOURCE_STATUS_NOTIFY:
|
|
return drm_dp_sideband_parse_resource_status_notify(raw, msg);
|
|
default:
|
|
DRM_ERROR("Got unknown request 0x%02x (%s)\n", msg->req_type,
|
|
drm_dp_mst_req_type_str(msg->req_type));
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes)
|
|
{
|
|
struct drm_dp_sideband_msg_req_body req;
|
|
|
|
req.req_type = DP_REMOTE_DPCD_WRITE;
|
|
req.u.dpcd_write.port_number = port_num;
|
|
req.u.dpcd_write.dpcd_address = offset;
|
|
req.u.dpcd_write.num_bytes = num_bytes;
|
|
req.u.dpcd_write.bytes = bytes;
|
|
drm_dp_encode_sideband_req(&req, msg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int build_link_address(struct drm_dp_sideband_msg_tx *msg)
|
|
{
|
|
struct drm_dp_sideband_msg_req_body req;
|
|
|
|
req.req_type = DP_LINK_ADDRESS;
|
|
drm_dp_encode_sideband_req(&req, msg);
|
|
return 0;
|
|
}
|
|
|
|
static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num)
|
|
{
|
|
struct drm_dp_sideband_msg_req_body req;
|
|
|
|
req.req_type = DP_ENUM_PATH_RESOURCES;
|
|
req.u.port_num.port_number = port_num;
|
|
drm_dp_encode_sideband_req(&req, msg);
|
|
msg->path_msg = true;
|
|
return 0;
|
|
}
|
|
|
|
static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num,
|
|
u8 vcpi, uint16_t pbn,
|
|
u8 number_sdp_streams,
|
|
u8 *sdp_stream_sink)
|
|
{
|
|
struct drm_dp_sideband_msg_req_body req;
|
|
memset(&req, 0, sizeof(req));
|
|
req.req_type = DP_ALLOCATE_PAYLOAD;
|
|
req.u.allocate_payload.port_number = port_num;
|
|
req.u.allocate_payload.vcpi = vcpi;
|
|
req.u.allocate_payload.pbn = pbn;
|
|
req.u.allocate_payload.number_sdp_streams = number_sdp_streams;
|
|
memcpy(req.u.allocate_payload.sdp_stream_sink, sdp_stream_sink,
|
|
number_sdp_streams);
|
|
drm_dp_encode_sideband_req(&req, msg);
|
|
msg->path_msg = true;
|
|
return 0;
|
|
}
|
|
|
|
static int build_power_updown_phy(struct drm_dp_sideband_msg_tx *msg,
|
|
int port_num, bool power_up)
|
|
{
|
|
struct drm_dp_sideband_msg_req_body req;
|
|
|
|
if (power_up)
|
|
req.req_type = DP_POWER_UP_PHY;
|
|
else
|
|
req.req_type = DP_POWER_DOWN_PHY;
|
|
|
|
req.u.port_num.port_number = port_num;
|
|
drm_dp_encode_sideband_req(&req, msg);
|
|
msg->path_msg = true;
|
|
return 0;
|
|
}
|
|
|
|
static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_vcpi *vcpi)
|
|
{
|
|
int ret, vcpi_ret;
|
|
|
|
mutex_lock(&mgr->payload_lock);
|
|
ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1);
|
|
if (ret > mgr->max_payloads) {
|
|
ret = -EINVAL;
|
|
DRM_DEBUG_KMS("out of payload ids %d\n", ret);
|
|
goto out_unlock;
|
|
}
|
|
|
|
vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1);
|
|
if (vcpi_ret > mgr->max_payloads) {
|
|
ret = -EINVAL;
|
|
DRM_DEBUG_KMS("out of vcpi ids %d\n", ret);
|
|
goto out_unlock;
|
|
}
|
|
|
|
set_bit(ret, &mgr->payload_mask);
|
|
set_bit(vcpi_ret, &mgr->vcpi_mask);
|
|
vcpi->vcpi = vcpi_ret + 1;
|
|
mgr->proposed_vcpis[ret - 1] = vcpi;
|
|
out_unlock:
|
|
mutex_unlock(&mgr->payload_lock);
|
|
return ret;
|
|
}
|
|
|
|
static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr,
|
|
int vcpi)
|
|
{
|
|
int i;
|
|
if (vcpi == 0)
|
|
return;
|
|
|
|
mutex_lock(&mgr->payload_lock);
|
|
DRM_DEBUG_KMS("putting payload %d\n", vcpi);
|
|
clear_bit(vcpi - 1, &mgr->vcpi_mask);
|
|
|
|
for (i = 0; i < mgr->max_payloads; i++) {
|
|
if (mgr->proposed_vcpis[i])
|
|
if (mgr->proposed_vcpis[i]->vcpi == vcpi) {
|
|
mgr->proposed_vcpis[i] = NULL;
|
|
clear_bit(i + 1, &mgr->payload_mask);
|
|
}
|
|
}
|
|
mutex_unlock(&mgr->payload_lock);
|
|
}
|
|
|
|
static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_sideband_msg_tx *txmsg)
|
|
{
|
|
unsigned int state;
|
|
|
|
/*
|
|
* All updates to txmsg->state are protected by mgr->qlock, and the two
|
|
* cases we check here are terminal states. For those the barriers
|
|
* provided by the wake_up/wait_event pair are enough.
|
|
*/
|
|
state = READ_ONCE(txmsg->state);
|
|
return (state == DRM_DP_SIDEBAND_TX_RX ||
|
|
state == DRM_DP_SIDEBAND_TX_TIMEOUT);
|
|
}
|
|
|
|
static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb,
|
|
struct drm_dp_sideband_msg_tx *txmsg)
|
|
{
|
|
struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;
|
|
int ret;
|
|
|
|
ret = wait_event_timeout(mgr->tx_waitq,
|
|
check_txmsg_state(mgr, txmsg),
|
|
(4 * HZ));
|
|
mutex_lock(&mstb->mgr->qlock);
|
|
if (ret > 0) {
|
|
if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
} else {
|
|
DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno);
|
|
|
|
/* dump some state */
|
|
ret = -EIO;
|
|
|
|
/* remove from q */
|
|
if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED ||
|
|
txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) {
|
|
list_del(&txmsg->next);
|
|
}
|
|
|
|
if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND ||
|
|
txmsg->state == DRM_DP_SIDEBAND_TX_SENT) {
|
|
mstb->tx_slots[txmsg->seqno] = NULL;
|
|
}
|
|
}
|
|
out:
|
|
mutex_unlock(&mgr->qlock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad)
|
|
{
|
|
struct drm_dp_mst_branch *mstb;
|
|
|
|
mstb = kzalloc(sizeof(*mstb), GFP_KERNEL);
|
|
if (!mstb)
|
|
return NULL;
|
|
|
|
mstb->lct = lct;
|
|
if (lct > 1)
|
|
memcpy(mstb->rad, rad, lct / 2);
|
|
INIT_LIST_HEAD(&mstb->ports);
|
|
kref_init(&mstb->topology_kref);
|
|
kref_init(&mstb->malloc_kref);
|
|
return mstb;
|
|
}
|
|
|
|
static void drm_dp_free_mst_branch_device(struct kref *kref)
|
|
{
|
|
struct drm_dp_mst_branch *mstb =
|
|
container_of(kref, struct drm_dp_mst_branch, malloc_kref);
|
|
|
|
if (mstb->port_parent)
|
|
drm_dp_mst_put_port_malloc(mstb->port_parent);
|
|
|
|
kfree(mstb);
|
|
}
|
|
|
|
/**
|
|
* DOC: Branch device and port refcounting
|
|
*
|
|
* Topology refcount overview
|
|
* ~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
*
|
|
* The refcounting schemes for &struct drm_dp_mst_branch and &struct
|
|
* drm_dp_mst_port are somewhat unusual. Both ports and branch devices have
|
|
* two different kinds of refcounts: topology refcounts, and malloc refcounts.
|
|
*
|
|
* Topology refcounts are not exposed to drivers, and are handled internally
|
|
* by the DP MST helpers. The helpers use them in order to prevent the
|
|
* in-memory topology state from being changed in the middle of critical
|
|
* operations like changing the internal state of payload allocations. This
|
|
* means each branch and port will be considered to be connected to the rest
|
|
* of the topology until its topology refcount reaches zero. Additionally,
|
|
* for ports this means that their associated &struct drm_connector will stay
|
|
* registered with userspace until the port's refcount reaches 0.
|
|
*
|
|
* Malloc refcount overview
|
|
* ~~~~~~~~~~~~~~~~~~~~~~~~
|
|
*
|
|
* Malloc references are used to keep a &struct drm_dp_mst_port or &struct
|
|
* drm_dp_mst_branch allocated even after all of its topology references have
|
|
* been dropped, so that the driver or MST helpers can safely access each
|
|
* branch's last known state before it was disconnected from the topology.
|
|
* When the malloc refcount of a port or branch reaches 0, the memory
|
|
* allocation containing the &struct drm_dp_mst_branch or &struct
|
|
* drm_dp_mst_port respectively will be freed.
|
|
*
|
|
* For &struct drm_dp_mst_branch, malloc refcounts are not currently exposed
|
|
* to drivers. As of writing this documentation, there are no drivers that
|
|
* have a usecase for accessing &struct drm_dp_mst_branch outside of the MST
|
|
* helpers. Exposing this API to drivers in a race-free manner would take more
|
|
* tweaking of the refcounting scheme, however patches are welcome provided
|
|
* there is a legitimate driver usecase for this.
|
|
*
|
|
* Refcount relationships in a topology
|
|
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
*
|
|
* Let's take a look at why the relationship between topology and malloc
|
|
* refcounts is designed the way it is.
|
|
*
|
|
* .. kernel-figure:: dp-mst/topology-figure-1.dot
|
|
*
|
|
* An example of topology and malloc refs in a DP MST topology with two
|
|
* active payloads. Topology refcount increments are indicated by solid
|
|
* lines, and malloc refcount increments are indicated by dashed lines.
|
|
* Each starts from the branch which incremented the refcount, and ends at
|
|
* the branch to which the refcount belongs to, i.e. the arrow points the
|
|
* same way as the C pointers used to reference a structure.
|
|
*
|
|
* As you can see in the above figure, every branch increments the topology
|
|
* refcount of its children, and increments the malloc refcount of its
|
|
* parent. Additionally, every payload increments the malloc refcount of its
|
|
* assigned port by 1.
|
|
*
|
|
* So, what would happen if MSTB #3 from the above figure was unplugged from
|
|
* the system, but the driver hadn't yet removed payload #2 from port #3? The
|
|
* topology would start to look like the figure below.
|
|
*
|
|
* .. kernel-figure:: dp-mst/topology-figure-2.dot
|
|
*
|
|
* Ports and branch devices which have been released from memory are
|
|
* colored grey, and references which have been removed are colored red.
|
|
*
|
|
* Whenever a port or branch device's topology refcount reaches zero, it will
|
|
* decrement the topology refcounts of all its children, the malloc refcount
|
|
* of its parent, and finally its own malloc refcount. For MSTB #4 and port
|
|
* #4, this means they both have been disconnected from the topology and freed
|
|
* from memory. But, because payload #2 is still holding a reference to port
|
|
* #3, port #3 is removed from the topology but its &struct drm_dp_mst_port
|
|
* is still accessible from memory. This also means port #3 has not yet
|
|
* decremented the malloc refcount of MSTB #3, so its &struct
|
|
* drm_dp_mst_branch will also stay allocated in memory until port #3's
|
|
* malloc refcount reaches 0.
|
|
*
|
|
* This relationship is necessary because in order to release payload #2, we
|
|
* need to be able to figure out the last relative of port #3 that's still
|
|
* connected to the topology. In this case, we would travel up the topology as
|
|
* shown below.
|
|
*
|
|
* .. kernel-figure:: dp-mst/topology-figure-3.dot
|
|
*
|
|
* And finally, remove payload #2 by communicating with port #2 through
|
|
* sideband transactions.
|
|
*/
|
|
|
|
/**
|
|
* drm_dp_mst_get_mstb_malloc() - Increment the malloc refcount of a branch
|
|
* device
|
|
* @mstb: The &struct drm_dp_mst_branch to increment the malloc refcount of
|
|
*
|
|
* Increments &drm_dp_mst_branch.malloc_kref. When
|
|
* &drm_dp_mst_branch.malloc_kref reaches 0, the memory allocation for @mstb
|
|
* will be released and @mstb may no longer be used.
|
|
*
|
|
* See also: drm_dp_mst_put_mstb_malloc()
|
|
*/
|
|
static void
|
|
drm_dp_mst_get_mstb_malloc(struct drm_dp_mst_branch *mstb)
|
|
{
|
|
kref_get(&mstb->malloc_kref);
|
|
DRM_DEBUG("mstb %p (%d)\n", mstb, kref_read(&mstb->malloc_kref));
|
|
}
|
|
|
|
/**
|
|
* drm_dp_mst_put_mstb_malloc() - Decrement the malloc refcount of a branch
|
|
* device
|
|
* @mstb: The &struct drm_dp_mst_branch to decrement the malloc refcount of
|
|
*
|
|
* Decrements &drm_dp_mst_branch.malloc_kref. When
|
|
* &drm_dp_mst_branch.malloc_kref reaches 0, the memory allocation for @mstb
|
|
* will be released and @mstb may no longer be used.
|
|
*
|
|
* See also: drm_dp_mst_get_mstb_malloc()
|
|
*/
|
|
static void
|
|
drm_dp_mst_put_mstb_malloc(struct drm_dp_mst_branch *mstb)
|
|
{
|
|
DRM_DEBUG("mstb %p (%d)\n", mstb, kref_read(&mstb->malloc_kref) - 1);
|
|
kref_put(&mstb->malloc_kref, drm_dp_free_mst_branch_device);
|
|
}
|
|
|
|
static void drm_dp_free_mst_port(struct kref *kref)
|
|
{
|
|
struct drm_dp_mst_port *port =
|
|
container_of(kref, struct drm_dp_mst_port, malloc_kref);
|
|
|
|
drm_dp_mst_put_mstb_malloc(port->parent);
|
|
kfree(port);
|
|
}
|
|
|
|
/**
|
|
* drm_dp_mst_get_port_malloc() - Increment the malloc refcount of an MST port
|
|
* @port: The &struct drm_dp_mst_port to increment the malloc refcount of
|
|
*
|
|
* Increments &drm_dp_mst_port.malloc_kref. When &drm_dp_mst_port.malloc_kref
|
|
* reaches 0, the memory allocation for @port will be released and @port may
|
|
* no longer be used.
|
|
*
|
|
* Because @port could potentially be freed at any time by the DP MST helpers
|
|
* if &drm_dp_mst_port.malloc_kref reaches 0, including during a call to this
|
|
* function, drivers that which to make use of &struct drm_dp_mst_port should
|
|
* ensure that they grab at least one main malloc reference to their MST ports
|
|
* in &drm_dp_mst_topology_cbs.add_connector. This callback is called before
|
|
* there is any chance for &drm_dp_mst_port.malloc_kref to reach 0.
|
|
*
|
|
* See also: drm_dp_mst_put_port_malloc()
|
|
*/
|
|
void
|
|
drm_dp_mst_get_port_malloc(struct drm_dp_mst_port *port)
|
|
{
|
|
kref_get(&port->malloc_kref);
|
|
DRM_DEBUG("port %p (%d)\n", port, kref_read(&port->malloc_kref));
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_get_port_malloc);
|
|
|
|
/**
|
|
* drm_dp_mst_put_port_malloc() - Decrement the malloc refcount of an MST port
|
|
* @port: The &struct drm_dp_mst_port to decrement the malloc refcount of
|
|
*
|
|
* Decrements &drm_dp_mst_port.malloc_kref. When &drm_dp_mst_port.malloc_kref
|
|
* reaches 0, the memory allocation for @port will be released and @port may
|
|
* no longer be used.
|
|
*
|
|
* See also: drm_dp_mst_get_port_malloc()
|
|
*/
|
|
void
|
|
drm_dp_mst_put_port_malloc(struct drm_dp_mst_port *port)
|
|
{
|
|
DRM_DEBUG("port %p (%d)\n", port, kref_read(&port->malloc_kref) - 1);
|
|
kref_put(&port->malloc_kref, drm_dp_free_mst_port);
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_put_port_malloc);
|
|
|
|
static void drm_dp_destroy_mst_branch_device(struct kref *kref)
|
|
{
|
|
struct drm_dp_mst_branch *mstb =
|
|
container_of(kref, struct drm_dp_mst_branch, topology_kref);
|
|
struct drm_dp_mst_topology_mgr *mgr = mstb->mgr;
|
|
struct drm_dp_mst_port *port, *tmp;
|
|
bool wake_tx = false;
|
|
|
|
mutex_lock(&mgr->lock);
|
|
list_for_each_entry_safe(port, tmp, &mstb->ports, next) {
|
|
list_del(&port->next);
|
|
drm_dp_mst_topology_put_port(port);
|
|
}
|
|
mutex_unlock(&mgr->lock);
|
|
|
|
/* drop any tx slots msg */
|
|
mutex_lock(&mstb->mgr->qlock);
|
|
if (mstb->tx_slots[0]) {
|
|
mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
|
|
mstb->tx_slots[0] = NULL;
|
|
wake_tx = true;
|
|
}
|
|
if (mstb->tx_slots[1]) {
|
|
mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
|
|
mstb->tx_slots[1] = NULL;
|
|
wake_tx = true;
|
|
}
|
|
mutex_unlock(&mstb->mgr->qlock);
|
|
|
|
if (wake_tx)
|
|
wake_up_all(&mstb->mgr->tx_waitq);
|
|
|
|
drm_dp_mst_put_mstb_malloc(mstb);
|
|
}
|
|
|
|
/**
|
|
* drm_dp_mst_topology_try_get_mstb() - Increment the topology refcount of a
|
|
* branch device unless it's zero
|
|
* @mstb: &struct drm_dp_mst_branch to increment the topology refcount of
|
|
*
|
|
* Attempts to grab a topology reference to @mstb, if it hasn't yet been
|
|
* removed from the topology (e.g. &drm_dp_mst_branch.topology_kref has
|
|
* reached 0). Holding a topology reference implies that a malloc reference
|
|
* will be held to @mstb as long as the user holds the topology reference.
|
|
*
|
|
* Care should be taken to ensure that the user has at least one malloc
|
|
* reference to @mstb. If you already have a topology reference to @mstb, you
|
|
* should use drm_dp_mst_topology_get_mstb() instead.
|
|
*
|
|
* See also:
|
|
* drm_dp_mst_topology_get_mstb()
|
|
* drm_dp_mst_topology_put_mstb()
|
|
*
|
|
* Returns:
|
|
* * 1: A topology reference was grabbed successfully
|
|
* * 0: @port is no longer in the topology, no reference was grabbed
|
|
*/
|
|
static int __must_check
|
|
drm_dp_mst_topology_try_get_mstb(struct drm_dp_mst_branch *mstb)
|
|
{
|
|
int ret = kref_get_unless_zero(&mstb->topology_kref);
|
|
|
|
if (ret)
|
|
DRM_DEBUG("mstb %p (%d)\n", mstb,
|
|
kref_read(&mstb->topology_kref));
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* drm_dp_mst_topology_get_mstb() - Increment the topology refcount of a
|
|
* branch device
|
|
* @mstb: The &struct drm_dp_mst_branch to increment the topology refcount of
|
|
*
|
|
* Increments &drm_dp_mst_branch.topology_refcount without checking whether or
|
|
* not it's already reached 0. This is only valid to use in scenarios where
|
|
* you are already guaranteed to have at least one active topology reference
|
|
* to @mstb. Otherwise, drm_dp_mst_topology_try_get_mstb() must be used.
|
|
*
|
|
* See also:
|
|
* drm_dp_mst_topology_try_get_mstb()
|
|
* drm_dp_mst_topology_put_mstb()
|
|
*/
|
|
static void drm_dp_mst_topology_get_mstb(struct drm_dp_mst_branch *mstb)
|
|
{
|
|
WARN_ON(kref_read(&mstb->topology_kref) == 0);
|
|
kref_get(&mstb->topology_kref);
|
|
DRM_DEBUG("mstb %p (%d)\n", mstb, kref_read(&mstb->topology_kref));
|
|
}
|
|
|
|
/**
|
|
* drm_dp_mst_topology_put_mstb() - release a topology reference to a branch
|
|
* device
|
|
* @mstb: The &struct drm_dp_mst_branch to release the topology reference from
|
|
*
|
|
* Releases a topology reference from @mstb by decrementing
|
|
* &drm_dp_mst_branch.topology_kref.
|
|
*
|
|
* See also:
|
|
* drm_dp_mst_topology_try_get_mstb()
|
|
* drm_dp_mst_topology_get_mstb()
|
|
*/
|
|
static void
|
|
drm_dp_mst_topology_put_mstb(struct drm_dp_mst_branch *mstb)
|
|
{
|
|
DRM_DEBUG("mstb %p (%d)\n",
|
|
mstb, kref_read(&mstb->topology_kref) - 1);
|
|
kref_put(&mstb->topology_kref, drm_dp_destroy_mst_branch_device);
|
|
}
|
|
|
|
static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt)
|
|
{
|
|
struct drm_dp_mst_branch *mstb;
|
|
|
|
switch (old_pdt) {
|
|
case DP_PEER_DEVICE_DP_LEGACY_CONV:
|
|
case DP_PEER_DEVICE_SST_SINK:
|
|
/* remove i2c over sideband */
|
|
drm_dp_mst_unregister_i2c_bus(&port->aux);
|
|
break;
|
|
case DP_PEER_DEVICE_MST_BRANCHING:
|
|
mstb = port->mstb;
|
|
port->mstb = NULL;
|
|
drm_dp_mst_topology_put_mstb(mstb);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void drm_dp_destroy_port(struct kref *kref)
|
|
{
|
|
struct drm_dp_mst_port *port =
|
|
container_of(kref, struct drm_dp_mst_port, topology_kref);
|
|
struct drm_dp_mst_topology_mgr *mgr = port->mgr;
|
|
|
|
if (!port->input) {
|
|
kfree(port->cached_edid);
|
|
|
|
/*
|
|
* The only time we don't have a connector
|
|
* on an output port is if the connector init
|
|
* fails.
|
|
*/
|
|
if (port->connector) {
|
|
/* we can't destroy the connector here, as
|
|
* we might be holding the mode_config.mutex
|
|
* from an EDID retrieval */
|
|
|
|
mutex_lock(&mgr->destroy_connector_lock);
|
|
list_add(&port->next, &mgr->destroy_connector_list);
|
|
mutex_unlock(&mgr->destroy_connector_lock);
|
|
schedule_work(&mgr->destroy_connector_work);
|
|
return;
|
|
}
|
|
/* no need to clean up vcpi
|
|
* as if we have no connector we never setup a vcpi */
|
|
drm_dp_port_teardown_pdt(port, port->pdt);
|
|
port->pdt = DP_PEER_DEVICE_NONE;
|
|
}
|
|
drm_dp_mst_put_port_malloc(port);
|
|
}
|
|
|
|
/**
|
|
* drm_dp_mst_topology_try_get_port() - Increment the topology refcount of a
|
|
* port unless it's zero
|
|
* @port: &struct drm_dp_mst_port to increment the topology refcount of
|
|
*
|
|
* Attempts to grab a topology reference to @port, if it hasn't yet been
|
|
* removed from the topology (e.g. &drm_dp_mst_port.topology_kref has reached
|
|
* 0). Holding a topology reference implies that a malloc reference will be
|
|
* held to @port as long as the user holds the topology reference.
|
|
*
|
|
* Care should be taken to ensure that the user has at least one malloc
|
|
* reference to @port. If you already have a topology reference to @port, you
|
|
* should use drm_dp_mst_topology_get_port() instead.
|
|
*
|
|
* See also:
|
|
* drm_dp_mst_topology_get_port()
|
|
* drm_dp_mst_topology_put_port()
|
|
*
|
|
* Returns:
|
|
* * 1: A topology reference was grabbed successfully
|
|
* * 0: @port is no longer in the topology, no reference was grabbed
|
|
*/
|
|
static int __must_check
|
|
drm_dp_mst_topology_try_get_port(struct drm_dp_mst_port *port)
|
|
{
|
|
int ret = kref_get_unless_zero(&port->topology_kref);
|
|
|
|
if (ret)
|
|
DRM_DEBUG("port %p (%d)\n", port,
|
|
kref_read(&port->topology_kref));
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* drm_dp_mst_topology_get_port() - Increment the topology refcount of a port
|
|
* @port: The &struct drm_dp_mst_port to increment the topology refcount of
|
|
*
|
|
* Increments &drm_dp_mst_port.topology_refcount without checking whether or
|
|
* not it's already reached 0. This is only valid to use in scenarios where
|
|
* you are already guaranteed to have at least one active topology reference
|
|
* to @port. Otherwise, drm_dp_mst_topology_try_get_port() must be used.
|
|
*
|
|
* See also:
|
|
* drm_dp_mst_topology_try_get_port()
|
|
* drm_dp_mst_topology_put_port()
|
|
*/
|
|
static void drm_dp_mst_topology_get_port(struct drm_dp_mst_port *port)
|
|
{
|
|
WARN_ON(kref_read(&port->topology_kref) == 0);
|
|
kref_get(&port->topology_kref);
|
|
DRM_DEBUG("port %p (%d)\n", port, kref_read(&port->topology_kref));
|
|
}
|
|
|
|
/**
|
|
* drm_dp_mst_topology_put_port() - release a topology reference to a port
|
|
* @port: The &struct drm_dp_mst_port to release the topology reference from
|
|
*
|
|
* Releases a topology reference from @port by decrementing
|
|
* &drm_dp_mst_port.topology_kref.
|
|
*
|
|
* See also:
|
|
* drm_dp_mst_topology_try_get_port()
|
|
* drm_dp_mst_topology_get_port()
|
|
*/
|
|
static void drm_dp_mst_topology_put_port(struct drm_dp_mst_port *port)
|
|
{
|
|
DRM_DEBUG("port %p (%d)\n",
|
|
port, kref_read(&port->topology_kref) - 1);
|
|
kref_put(&port->topology_kref, drm_dp_destroy_port);
|
|
}
|
|
|
|
static struct drm_dp_mst_branch *
|
|
drm_dp_mst_topology_get_mstb_validated_locked(struct drm_dp_mst_branch *mstb,
|
|
struct drm_dp_mst_branch *to_find)
|
|
{
|
|
struct drm_dp_mst_port *port;
|
|
struct drm_dp_mst_branch *rmstb;
|
|
|
|
if (to_find == mstb)
|
|
return mstb;
|
|
|
|
list_for_each_entry(port, &mstb->ports, next) {
|
|
if (port->mstb) {
|
|
rmstb = drm_dp_mst_topology_get_mstb_validated_locked(
|
|
port->mstb, to_find);
|
|
if (rmstb)
|
|
return rmstb;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct drm_dp_mst_branch *
|
|
drm_dp_mst_topology_get_mstb_validated(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_branch *mstb)
|
|
{
|
|
struct drm_dp_mst_branch *rmstb = NULL;
|
|
|
|
mutex_lock(&mgr->lock);
|
|
if (mgr->mst_primary) {
|
|
rmstb = drm_dp_mst_topology_get_mstb_validated_locked(
|
|
mgr->mst_primary, mstb);
|
|
|
|
if (rmstb && !drm_dp_mst_topology_try_get_mstb(rmstb))
|
|
rmstb = NULL;
|
|
}
|
|
mutex_unlock(&mgr->lock);
|
|
return rmstb;
|
|
}
|
|
|
|
static struct drm_dp_mst_port *
|
|
drm_dp_mst_topology_get_port_validated_locked(struct drm_dp_mst_branch *mstb,
|
|
struct drm_dp_mst_port *to_find)
|
|
{
|
|
struct drm_dp_mst_port *port, *mport;
|
|
|
|
list_for_each_entry(port, &mstb->ports, next) {
|
|
if (port == to_find)
|
|
return port;
|
|
|
|
if (port->mstb) {
|
|
mport = drm_dp_mst_topology_get_port_validated_locked(
|
|
port->mstb, to_find);
|
|
if (mport)
|
|
return mport;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct drm_dp_mst_port *
|
|
drm_dp_mst_topology_get_port_validated(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_port *port)
|
|
{
|
|
struct drm_dp_mst_port *rport = NULL;
|
|
|
|
mutex_lock(&mgr->lock);
|
|
if (mgr->mst_primary) {
|
|
rport = drm_dp_mst_topology_get_port_validated_locked(
|
|
mgr->mst_primary, port);
|
|
|
|
if (rport && !drm_dp_mst_topology_try_get_port(rport))
|
|
rport = NULL;
|
|
}
|
|
mutex_unlock(&mgr->lock);
|
|
return rport;
|
|
}
|
|
|
|
static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num)
|
|
{
|
|
struct drm_dp_mst_port *port;
|
|
int ret;
|
|
|
|
list_for_each_entry(port, &mstb->ports, next) {
|
|
if (port->port_num == port_num) {
|
|
ret = drm_dp_mst_topology_try_get_port(port);
|
|
return ret ? port : NULL;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* calculate a new RAD for this MST branch device
|
|
* if parent has an LCT of 2 then it has 1 nibble of RAD,
|
|
* if parent has an LCT of 3 then it has 2 nibbles of RAD,
|
|
*/
|
|
static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port,
|
|
u8 *rad)
|
|
{
|
|
int parent_lct = port->parent->lct;
|
|
int shift = 4;
|
|
int idx = (parent_lct - 1) / 2;
|
|
if (parent_lct > 1) {
|
|
memcpy(rad, port->parent->rad, idx + 1);
|
|
shift = (parent_lct % 2) ? 4 : 0;
|
|
} else
|
|
rad[0] = 0;
|
|
|
|
rad[idx] |= port->port_num << shift;
|
|
return parent_lct + 1;
|
|
}
|
|
|
|
/*
|
|
* return sends link address for new mstb
|
|
*/
|
|
static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port)
|
|
{
|
|
int ret;
|
|
u8 rad[6], lct;
|
|
bool send_link = false;
|
|
switch (port->pdt) {
|
|
case DP_PEER_DEVICE_DP_LEGACY_CONV:
|
|
case DP_PEER_DEVICE_SST_SINK:
|
|
/* add i2c over sideband */
|
|
ret = drm_dp_mst_register_i2c_bus(&port->aux);
|
|
break;
|
|
case DP_PEER_DEVICE_MST_BRANCHING:
|
|
lct = drm_dp_calculate_rad(port, rad);
|
|
|
|
port->mstb = drm_dp_add_mst_branch_device(lct, rad);
|
|
if (port->mstb) {
|
|
port->mstb->mgr = port->mgr;
|
|
port->mstb->port_parent = port;
|
|
/*
|
|
* Make sure this port's memory allocation stays
|
|
* around until its child MSTB releases it
|
|
*/
|
|
drm_dp_mst_get_port_malloc(port);
|
|
|
|
send_link = true;
|
|
}
|
|
break;
|
|
}
|
|
return send_link;
|
|
}
|
|
|
|
static void drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid)
|
|
{
|
|
int ret;
|
|
|
|
memcpy(mstb->guid, guid, 16);
|
|
|
|
if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) {
|
|
if (mstb->port_parent) {
|
|
ret = drm_dp_send_dpcd_write(
|
|
mstb->mgr,
|
|
mstb->port_parent,
|
|
DP_GUID,
|
|
16,
|
|
mstb->guid);
|
|
} else {
|
|
|
|
ret = drm_dp_dpcd_write(
|
|
mstb->mgr->aux,
|
|
DP_GUID,
|
|
mstb->guid,
|
|
16);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb,
|
|
int pnum,
|
|
char *proppath,
|
|
size_t proppath_size)
|
|
{
|
|
int i;
|
|
char temp[8];
|
|
snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id);
|
|
for (i = 0; i < (mstb->lct - 1); i++) {
|
|
int shift = (i % 2) ? 0 : 4;
|
|
int port_num = (mstb->rad[i / 2] >> shift) & 0xf;
|
|
snprintf(temp, sizeof(temp), "-%d", port_num);
|
|
strlcat(proppath, temp, proppath_size);
|
|
}
|
|
snprintf(temp, sizeof(temp), "-%d", pnum);
|
|
strlcat(proppath, temp, proppath_size);
|
|
}
|
|
|
|
static void drm_dp_add_port(struct drm_dp_mst_branch *mstb,
|
|
struct drm_device *dev,
|
|
struct drm_dp_link_addr_reply_port *port_msg)
|
|
{
|
|
struct drm_dp_mst_port *port;
|
|
bool ret;
|
|
bool created = false;
|
|
int old_pdt = 0;
|
|
int old_ddps = 0;
|
|
|
|
port = drm_dp_get_port(mstb, port_msg->port_number);
|
|
if (!port) {
|
|
port = kzalloc(sizeof(*port), GFP_KERNEL);
|
|
if (!port)
|
|
return;
|
|
kref_init(&port->topology_kref);
|
|
kref_init(&port->malloc_kref);
|
|
port->parent = mstb;
|
|
port->port_num = port_msg->port_number;
|
|
port->mgr = mstb->mgr;
|
|
port->aux.name = "DPMST";
|
|
port->aux.dev = dev->dev;
|
|
|
|
/*
|
|
* Make sure the memory allocation for our parent branch stays
|
|
* around until our own memory allocation is released
|
|
*/
|
|
drm_dp_mst_get_mstb_malloc(mstb);
|
|
|
|
created = true;
|
|
} else {
|
|
old_pdt = port->pdt;
|
|
old_ddps = port->ddps;
|
|
}
|
|
|
|
port->pdt = port_msg->peer_device_type;
|
|
port->input = port_msg->input_port;
|
|
port->mcs = port_msg->mcs;
|
|
port->ddps = port_msg->ddps;
|
|
port->ldps = port_msg->legacy_device_plug_status;
|
|
port->dpcd_rev = port_msg->dpcd_revision;
|
|
port->num_sdp_streams = port_msg->num_sdp_streams;
|
|
port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks;
|
|
|
|
/* manage mstb port lists with mgr lock - take a reference
|
|
for this list */
|
|
if (created) {
|
|
mutex_lock(&mstb->mgr->lock);
|
|
drm_dp_mst_topology_get_port(port);
|
|
list_add(&port->next, &mstb->ports);
|
|
mutex_unlock(&mstb->mgr->lock);
|
|
}
|
|
|
|
if (old_ddps != port->ddps) {
|
|
if (port->ddps) {
|
|
if (!port->input) {
|
|
drm_dp_send_enum_path_resources(mstb->mgr,
|
|
mstb, port);
|
|
}
|
|
} else {
|
|
port->available_pbn = 0;
|
|
}
|
|
}
|
|
|
|
if (old_pdt != port->pdt && !port->input) {
|
|
drm_dp_port_teardown_pdt(port, old_pdt);
|
|
|
|
ret = drm_dp_port_setup_pdt(port);
|
|
if (ret == true)
|
|
drm_dp_send_link_address(mstb->mgr, port->mstb);
|
|
}
|
|
|
|
if (created && !port->input) {
|
|
char proppath[255];
|
|
|
|
build_mst_prop_path(mstb, port->port_num, proppath,
|
|
sizeof(proppath));
|
|
port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr,
|
|
port,
|
|
proppath);
|
|
if (!port->connector) {
|
|
/* remove it from the port list */
|
|
mutex_lock(&mstb->mgr->lock);
|
|
list_del(&port->next);
|
|
mutex_unlock(&mstb->mgr->lock);
|
|
/* drop port list reference */
|
|
drm_dp_mst_topology_put_port(port);
|
|
goto out;
|
|
}
|
|
if ((port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV ||
|
|
port->pdt == DP_PEER_DEVICE_SST_SINK) &&
|
|
port->port_num >= DP_MST_LOGICAL_PORT_0) {
|
|
port->cached_edid = drm_get_edid(port->connector,
|
|
&port->aux.ddc);
|
|
drm_connector_set_tile_property(port->connector);
|
|
}
|
|
(*mstb->mgr->cbs->register_connector)(port->connector);
|
|
}
|
|
|
|
out:
|
|
/* put reference to this port */
|
|
drm_dp_mst_topology_put_port(port);
|
|
}
|
|
|
|
static void drm_dp_update_port(struct drm_dp_mst_branch *mstb,
|
|
struct drm_dp_connection_status_notify *conn_stat)
|
|
{
|
|
struct drm_dp_mst_port *port;
|
|
int old_pdt;
|
|
int old_ddps;
|
|
bool dowork = false;
|
|
port = drm_dp_get_port(mstb, conn_stat->port_number);
|
|
if (!port)
|
|
return;
|
|
|
|
old_ddps = port->ddps;
|
|
old_pdt = port->pdt;
|
|
port->pdt = conn_stat->peer_device_type;
|
|
port->mcs = conn_stat->message_capability_status;
|
|
port->ldps = conn_stat->legacy_device_plug_status;
|
|
port->ddps = conn_stat->displayport_device_plug_status;
|
|
|
|
if (old_ddps != port->ddps) {
|
|
if (port->ddps) {
|
|
dowork = true;
|
|
} else {
|
|
port->available_pbn = 0;
|
|
}
|
|
}
|
|
if (old_pdt != port->pdt && !port->input) {
|
|
drm_dp_port_teardown_pdt(port, old_pdt);
|
|
|
|
if (drm_dp_port_setup_pdt(port))
|
|
dowork = true;
|
|
}
|
|
|
|
drm_dp_mst_topology_put_port(port);
|
|
if (dowork)
|
|
queue_work(system_long_wq, &mstb->mgr->work);
|
|
|
|
}
|
|
|
|
static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr,
|
|
u8 lct, u8 *rad)
|
|
{
|
|
struct drm_dp_mst_branch *mstb;
|
|
struct drm_dp_mst_port *port;
|
|
int i, ret;
|
|
/* find the port by iterating down */
|
|
|
|
mutex_lock(&mgr->lock);
|
|
mstb = mgr->mst_primary;
|
|
|
|
if (!mstb)
|
|
goto out;
|
|
|
|
for (i = 0; i < lct - 1; i++) {
|
|
int shift = (i % 2) ? 0 : 4;
|
|
int port_num = (rad[i / 2] >> shift) & 0xf;
|
|
|
|
list_for_each_entry(port, &mstb->ports, next) {
|
|
if (port->port_num == port_num) {
|
|
mstb = port->mstb;
|
|
if (!mstb) {
|
|
DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]);
|
|
goto out;
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
ret = drm_dp_mst_topology_try_get_mstb(mstb);
|
|
if (!ret)
|
|
mstb = NULL;
|
|
out:
|
|
mutex_unlock(&mgr->lock);
|
|
return mstb;
|
|
}
|
|
|
|
static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper(
|
|
struct drm_dp_mst_branch *mstb,
|
|
uint8_t *guid)
|
|
{
|
|
struct drm_dp_mst_branch *found_mstb;
|
|
struct drm_dp_mst_port *port;
|
|
|
|
if (memcmp(mstb->guid, guid, 16) == 0)
|
|
return mstb;
|
|
|
|
|
|
list_for_each_entry(port, &mstb->ports, next) {
|
|
if (!port->mstb)
|
|
continue;
|
|
|
|
found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid);
|
|
|
|
if (found_mstb)
|
|
return found_mstb;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct drm_dp_mst_branch *
|
|
drm_dp_get_mst_branch_device_by_guid(struct drm_dp_mst_topology_mgr *mgr,
|
|
uint8_t *guid)
|
|
{
|
|
struct drm_dp_mst_branch *mstb;
|
|
int ret;
|
|
|
|
/* find the port by iterating down */
|
|
mutex_lock(&mgr->lock);
|
|
|
|
mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid);
|
|
if (mstb) {
|
|
ret = drm_dp_mst_topology_try_get_mstb(mstb);
|
|
if (!ret)
|
|
mstb = NULL;
|
|
}
|
|
|
|
mutex_unlock(&mgr->lock);
|
|
return mstb;
|
|
}
|
|
|
|
static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_branch *mstb)
|
|
{
|
|
struct drm_dp_mst_port *port;
|
|
struct drm_dp_mst_branch *mstb_child;
|
|
if (!mstb->link_address_sent)
|
|
drm_dp_send_link_address(mgr, mstb);
|
|
|
|
list_for_each_entry(port, &mstb->ports, next) {
|
|
if (port->input)
|
|
continue;
|
|
|
|
if (!port->ddps)
|
|
continue;
|
|
|
|
if (!port->available_pbn)
|
|
drm_dp_send_enum_path_resources(mgr, mstb, port);
|
|
|
|
if (port->mstb) {
|
|
mstb_child = drm_dp_mst_topology_get_mstb_validated(
|
|
mgr, port->mstb);
|
|
if (mstb_child) {
|
|
drm_dp_check_and_send_link_address(mgr, mstb_child);
|
|
drm_dp_mst_topology_put_mstb(mstb_child);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void drm_dp_mst_link_probe_work(struct work_struct *work)
|
|
{
|
|
struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work);
|
|
struct drm_dp_mst_branch *mstb;
|
|
int ret;
|
|
|
|
mutex_lock(&mgr->lock);
|
|
mstb = mgr->mst_primary;
|
|
if (mstb) {
|
|
ret = drm_dp_mst_topology_try_get_mstb(mstb);
|
|
if (!ret)
|
|
mstb = NULL;
|
|
}
|
|
mutex_unlock(&mgr->lock);
|
|
if (mstb) {
|
|
drm_dp_check_and_send_link_address(mgr, mstb);
|
|
drm_dp_mst_topology_put_mstb(mstb);
|
|
}
|
|
}
|
|
|
|
static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
|
|
u8 *guid)
|
|
{
|
|
u64 salt;
|
|
|
|
if (memchr_inv(guid, 0, 16))
|
|
return true;
|
|
|
|
salt = get_jiffies_64();
|
|
|
|
memcpy(&guid[0], &salt, sizeof(u64));
|
|
memcpy(&guid[8], &salt, sizeof(u64));
|
|
|
|
return false;
|
|
}
|
|
|
|
#if 0
|
|
static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes)
|
|
{
|
|
struct drm_dp_sideband_msg_req_body req;
|
|
|
|
req.req_type = DP_REMOTE_DPCD_READ;
|
|
req.u.dpcd_read.port_number = port_num;
|
|
req.u.dpcd_read.dpcd_address = offset;
|
|
req.u.dpcd_read.num_bytes = num_bytes;
|
|
drm_dp_encode_sideband_req(&req, msg);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr,
|
|
bool up, u8 *msg, int len)
|
|
{
|
|
int ret;
|
|
int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE;
|
|
int tosend, total, offset;
|
|
int retries = 0;
|
|
|
|
retry:
|
|
total = len;
|
|
offset = 0;
|
|
do {
|
|
tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total);
|
|
|
|
ret = drm_dp_dpcd_write(mgr->aux, regbase + offset,
|
|
&msg[offset],
|
|
tosend);
|
|
if (ret != tosend) {
|
|
if (ret == -EIO && retries < 5) {
|
|
retries++;
|
|
goto retry;
|
|
}
|
|
DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret);
|
|
|
|
return -EIO;
|
|
}
|
|
offset += tosend;
|
|
total -= tosend;
|
|
} while (total > 0);
|
|
return 0;
|
|
}
|
|
|
|
static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr,
|
|
struct drm_dp_sideband_msg_tx *txmsg)
|
|
{
|
|
struct drm_dp_mst_branch *mstb = txmsg->dst;
|
|
u8 req_type;
|
|
|
|
/* both msg slots are full */
|
|
if (txmsg->seqno == -1) {
|
|
if (mstb->tx_slots[0] && mstb->tx_slots[1]) {
|
|
DRM_DEBUG_KMS("%s: failed to find slot\n", __func__);
|
|
return -EAGAIN;
|
|
}
|
|
if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) {
|
|
txmsg->seqno = mstb->last_seqno;
|
|
mstb->last_seqno ^= 1;
|
|
} else if (mstb->tx_slots[0] == NULL)
|
|
txmsg->seqno = 0;
|
|
else
|
|
txmsg->seqno = 1;
|
|
mstb->tx_slots[txmsg->seqno] = txmsg;
|
|
}
|
|
|
|
req_type = txmsg->msg[0] & 0x7f;
|
|
if (req_type == DP_CONNECTION_STATUS_NOTIFY ||
|
|
req_type == DP_RESOURCE_STATUS_NOTIFY)
|
|
hdr->broadcast = 1;
|
|
else
|
|
hdr->broadcast = 0;
|
|
hdr->path_msg = txmsg->path_msg;
|
|
hdr->lct = mstb->lct;
|
|
hdr->lcr = mstb->lct - 1;
|
|
if (mstb->lct > 1)
|
|
memcpy(hdr->rad, mstb->rad, mstb->lct / 2);
|
|
hdr->seqno = txmsg->seqno;
|
|
return 0;
|
|
}
|
|
/*
|
|
* process a single block of the next message in the sideband queue
|
|
*/
|
|
static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_sideband_msg_tx *txmsg,
|
|
bool up)
|
|
{
|
|
u8 chunk[48];
|
|
struct drm_dp_sideband_msg_hdr hdr;
|
|
int len, space, idx, tosend;
|
|
int ret;
|
|
|
|
memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr));
|
|
|
|
if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) {
|
|
txmsg->seqno = -1;
|
|
txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND;
|
|
}
|
|
|
|
/* make hdr from dst mst - for replies use seqno
|
|
otherwise assign one */
|
|
ret = set_hdr_from_dst_qlock(&hdr, txmsg);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* amount left to send in this message */
|
|
len = txmsg->cur_len - txmsg->cur_offset;
|
|
|
|
/* 48 - sideband msg size - 1 byte for data CRC, x header bytes */
|
|
space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr);
|
|
|
|
tosend = min(len, space);
|
|
if (len == txmsg->cur_len)
|
|
hdr.somt = 1;
|
|
if (space >= len)
|
|
hdr.eomt = 1;
|
|
|
|
|
|
hdr.msg_len = tosend + 1;
|
|
drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx);
|
|
memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend);
|
|
/* add crc at end */
|
|
drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend);
|
|
idx += tosend + 1;
|
|
|
|
ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx);
|
|
if (ret) {
|
|
DRM_DEBUG_KMS("sideband msg failed to send\n");
|
|
return ret;
|
|
}
|
|
|
|
txmsg->cur_offset += tosend;
|
|
if (txmsg->cur_offset == txmsg->cur_len) {
|
|
txmsg->state = DRM_DP_SIDEBAND_TX_SENT;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
struct drm_dp_sideband_msg_tx *txmsg;
|
|
int ret;
|
|
|
|
WARN_ON(!mutex_is_locked(&mgr->qlock));
|
|
|
|
/* construct a chunk from the first msg in the tx_msg queue */
|
|
if (list_empty(&mgr->tx_msg_downq))
|
|
return;
|
|
|
|
txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next);
|
|
ret = process_single_tx_qlock(mgr, txmsg, false);
|
|
if (ret == 1) {
|
|
/* txmsg is sent it should be in the slots now */
|
|
list_del(&txmsg->next);
|
|
} else if (ret) {
|
|
DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
|
|
list_del(&txmsg->next);
|
|
if (txmsg->seqno != -1)
|
|
txmsg->dst->tx_slots[txmsg->seqno] = NULL;
|
|
txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT;
|
|
wake_up_all(&mgr->tx_waitq);
|
|
}
|
|
}
|
|
|
|
/* called holding qlock */
|
|
static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_sideband_msg_tx *txmsg)
|
|
{
|
|
int ret;
|
|
|
|
/* construct a chunk from the first msg in the tx_msg queue */
|
|
ret = process_single_tx_qlock(mgr, txmsg, true);
|
|
|
|
if (ret != 1)
|
|
DRM_DEBUG_KMS("failed to send msg in q %d\n", ret);
|
|
|
|
txmsg->dst->tx_slots[txmsg->seqno] = NULL;
|
|
}
|
|
|
|
static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_sideband_msg_tx *txmsg)
|
|
{
|
|
mutex_lock(&mgr->qlock);
|
|
list_add_tail(&txmsg->next, &mgr->tx_msg_downq);
|
|
if (list_is_singular(&mgr->tx_msg_downq))
|
|
process_single_down_tx_qlock(mgr);
|
|
mutex_unlock(&mgr->qlock);
|
|
}
|
|
|
|
static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_branch *mstb)
|
|
{
|
|
int len;
|
|
struct drm_dp_sideband_msg_tx *txmsg;
|
|
int ret;
|
|
|
|
txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
|
|
if (!txmsg)
|
|
return;
|
|
|
|
txmsg->dst = mstb;
|
|
len = build_link_address(txmsg);
|
|
|
|
mstb->link_address_sent = true;
|
|
drm_dp_queue_down_tx(mgr, txmsg);
|
|
|
|
ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
|
|
if (ret > 0) {
|
|
int i;
|
|
|
|
if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {
|
|
DRM_DEBUG_KMS("link address nak received\n");
|
|
} else {
|
|
DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports);
|
|
for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
|
|
DRM_DEBUG_KMS("port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n", i,
|
|
txmsg->reply.u.link_addr.ports[i].input_port,
|
|
txmsg->reply.u.link_addr.ports[i].peer_device_type,
|
|
txmsg->reply.u.link_addr.ports[i].port_number,
|
|
txmsg->reply.u.link_addr.ports[i].dpcd_revision,
|
|
txmsg->reply.u.link_addr.ports[i].mcs,
|
|
txmsg->reply.u.link_addr.ports[i].ddps,
|
|
txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status,
|
|
txmsg->reply.u.link_addr.ports[i].num_sdp_streams,
|
|
txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks);
|
|
}
|
|
|
|
drm_dp_check_mstb_guid(mstb, txmsg->reply.u.link_addr.guid);
|
|
|
|
for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) {
|
|
drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]);
|
|
}
|
|
drm_kms_helper_hotplug_event(mgr->dev);
|
|
}
|
|
} else {
|
|
mstb->link_address_sent = false;
|
|
DRM_DEBUG_KMS("link address failed %d\n", ret);
|
|
}
|
|
|
|
kfree(txmsg);
|
|
}
|
|
|
|
static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_branch *mstb,
|
|
struct drm_dp_mst_port *port)
|
|
{
|
|
int len;
|
|
struct drm_dp_sideband_msg_tx *txmsg;
|
|
int ret;
|
|
|
|
txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
|
|
if (!txmsg)
|
|
return -ENOMEM;
|
|
|
|
txmsg->dst = mstb;
|
|
len = build_enum_path_resources(txmsg, port->port_num);
|
|
|
|
drm_dp_queue_down_tx(mgr, txmsg);
|
|
|
|
ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
|
|
if (ret > 0) {
|
|
if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {
|
|
DRM_DEBUG_KMS("enum path resources nak received\n");
|
|
} else {
|
|
if (port->port_num != txmsg->reply.u.path_resources.port_number)
|
|
DRM_ERROR("got incorrect port in response\n");
|
|
DRM_DEBUG_KMS("enum path resources %d: %d %d\n", txmsg->reply.u.path_resources.port_number, txmsg->reply.u.path_resources.full_payload_bw_number,
|
|
txmsg->reply.u.path_resources.avail_payload_bw_number);
|
|
port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number;
|
|
}
|
|
}
|
|
|
|
kfree(txmsg);
|
|
return 0;
|
|
}
|
|
|
|
static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb)
|
|
{
|
|
if (!mstb->port_parent)
|
|
return NULL;
|
|
|
|
if (mstb->port_parent->mstb != mstb)
|
|
return mstb->port_parent;
|
|
|
|
return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent);
|
|
}
|
|
|
|
/*
|
|
* Searches upwards in the topology starting from mstb to try to find the
|
|
* closest available parent of mstb that's still connected to the rest of the
|
|
* topology. This can be used in order to perform operations like releasing
|
|
* payloads, where the branch device which owned the payload may no longer be
|
|
* around and thus would require that the payload on the last living relative
|
|
* be freed instead.
|
|
*/
|
|
static struct drm_dp_mst_branch *
|
|
drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_branch *mstb,
|
|
int *port_num)
|
|
{
|
|
struct drm_dp_mst_branch *rmstb = NULL;
|
|
struct drm_dp_mst_port *found_port;
|
|
|
|
mutex_lock(&mgr->lock);
|
|
if (!mgr->mst_primary)
|
|
goto out;
|
|
|
|
do {
|
|
found_port = drm_dp_get_last_connected_port_to_mstb(mstb);
|
|
if (!found_port)
|
|
break;
|
|
|
|
if (drm_dp_mst_topology_try_get_mstb(found_port->parent)) {
|
|
rmstb = found_port->parent;
|
|
*port_num = found_port->port_num;
|
|
} else {
|
|
/* Search again, starting from this parent */
|
|
mstb = found_port->parent;
|
|
}
|
|
} while (!rmstb);
|
|
out:
|
|
mutex_unlock(&mgr->lock);
|
|
return rmstb;
|
|
}
|
|
|
|
static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_port *port,
|
|
int id,
|
|
int pbn)
|
|
{
|
|
struct drm_dp_sideband_msg_tx *txmsg;
|
|
struct drm_dp_mst_branch *mstb;
|
|
int len, ret, port_num;
|
|
u8 sinks[DRM_DP_MAX_SDP_STREAMS];
|
|
int i;
|
|
|
|
port_num = port->port_num;
|
|
mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent);
|
|
if (!mstb) {
|
|
mstb = drm_dp_get_last_connected_port_and_mstb(mgr,
|
|
port->parent,
|
|
&port_num);
|
|
|
|
if (!mstb)
|
|
return -EINVAL;
|
|
}
|
|
|
|
txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
|
|
if (!txmsg) {
|
|
ret = -ENOMEM;
|
|
goto fail_put;
|
|
}
|
|
|
|
for (i = 0; i < port->num_sdp_streams; i++)
|
|
sinks[i] = i;
|
|
|
|
txmsg->dst = mstb;
|
|
len = build_allocate_payload(txmsg, port_num,
|
|
id,
|
|
pbn, port->num_sdp_streams, sinks);
|
|
|
|
drm_dp_queue_down_tx(mgr, txmsg);
|
|
|
|
/*
|
|
* FIXME: there is a small chance that between getting the last
|
|
* connected mstb and sending the payload message, the last connected
|
|
* mstb could also be removed from the topology. In the future, this
|
|
* needs to be fixed by restarting the
|
|
* drm_dp_get_last_connected_port_and_mstb() search in the event of a
|
|
* timeout if the topology is still connected to the system.
|
|
*/
|
|
ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
|
|
if (ret > 0) {
|
|
if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK)
|
|
ret = -EINVAL;
|
|
else
|
|
ret = 0;
|
|
}
|
|
kfree(txmsg);
|
|
fail_put:
|
|
drm_dp_mst_topology_put_mstb(mstb);
|
|
return ret;
|
|
}
|
|
|
|
int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_port *port, bool power_up)
|
|
{
|
|
struct drm_dp_sideband_msg_tx *txmsg;
|
|
int len, ret;
|
|
|
|
port = drm_dp_mst_topology_get_port_validated(mgr, port);
|
|
if (!port)
|
|
return -EINVAL;
|
|
|
|
txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
|
|
if (!txmsg) {
|
|
drm_dp_mst_topology_put_port(port);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
txmsg->dst = port->parent;
|
|
len = build_power_updown_phy(txmsg, port->port_num, power_up);
|
|
drm_dp_queue_down_tx(mgr, txmsg);
|
|
|
|
ret = drm_dp_mst_wait_tx_reply(port->parent, txmsg);
|
|
if (ret > 0) {
|
|
if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK)
|
|
ret = -EINVAL;
|
|
else
|
|
ret = 0;
|
|
}
|
|
kfree(txmsg);
|
|
drm_dp_mst_topology_put_port(port);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_send_power_updown_phy);
|
|
|
|
static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
|
|
int id,
|
|
struct drm_dp_payload *payload)
|
|
{
|
|
int ret;
|
|
|
|
ret = drm_dp_dpcd_write_payload(mgr, id, payload);
|
|
if (ret < 0) {
|
|
payload->payload_state = 0;
|
|
return ret;
|
|
}
|
|
payload->payload_state = DP_PAYLOAD_LOCAL;
|
|
return 0;
|
|
}
|
|
|
|
static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_port *port,
|
|
int id,
|
|
struct drm_dp_payload *payload)
|
|
{
|
|
int ret;
|
|
ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn);
|
|
if (ret < 0)
|
|
return ret;
|
|
payload->payload_state = DP_PAYLOAD_REMOTE;
|
|
return ret;
|
|
}
|
|
|
|
static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_port *port,
|
|
int id,
|
|
struct drm_dp_payload *payload)
|
|
{
|
|
DRM_DEBUG_KMS("\n");
|
|
/* it's okay for these to fail */
|
|
if (port) {
|
|
drm_dp_payload_send_msg(mgr, port, id, 0);
|
|
}
|
|
|
|
drm_dp_dpcd_write_payload(mgr, id, payload);
|
|
payload->payload_state = DP_PAYLOAD_DELETE_LOCAL;
|
|
return 0;
|
|
}
|
|
|
|
static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr,
|
|
int id,
|
|
struct drm_dp_payload *payload)
|
|
{
|
|
payload->payload_state = 0;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* drm_dp_update_payload_part1() - Execute payload update part 1
|
|
* @mgr: manager to use.
|
|
*
|
|
* This iterates over all proposed virtual channels, and tries to
|
|
* allocate space in the link for them. For 0->slots transitions,
|
|
* this step just writes the VCPI to the MST device. For slots->0
|
|
* transitions, this writes the updated VCPIs and removes the
|
|
* remote VC payloads.
|
|
*
|
|
* after calling this the driver should generate ACT and payload
|
|
* packets.
|
|
*/
|
|
int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
struct drm_dp_payload req_payload;
|
|
struct drm_dp_mst_port *port;
|
|
int i, j;
|
|
int cur_slots = 1;
|
|
|
|
mutex_lock(&mgr->payload_lock);
|
|
for (i = 0; i < mgr->max_payloads; i++) {
|
|
struct drm_dp_vcpi *vcpi = mgr->proposed_vcpis[i];
|
|
struct drm_dp_payload *payload = &mgr->payloads[i];
|
|
bool put_port = false;
|
|
|
|
/* solve the current payloads - compare to the hw ones
|
|
- update the hw view */
|
|
req_payload.start_slot = cur_slots;
|
|
if (vcpi) {
|
|
port = container_of(vcpi, struct drm_dp_mst_port,
|
|
vcpi);
|
|
|
|
/* Validated ports don't matter if we're releasing
|
|
* VCPI
|
|
*/
|
|
if (vcpi->num_slots) {
|
|
port = drm_dp_mst_topology_get_port_validated(
|
|
mgr, port);
|
|
if (!port) {
|
|
mutex_unlock(&mgr->payload_lock);
|
|
return -EINVAL;
|
|
}
|
|
put_port = true;
|
|
}
|
|
|
|
req_payload.num_slots = vcpi->num_slots;
|
|
req_payload.vcpi = vcpi->vcpi;
|
|
} else {
|
|
port = NULL;
|
|
req_payload.num_slots = 0;
|
|
}
|
|
|
|
payload->start_slot = req_payload.start_slot;
|
|
/* work out what is required to happen with this payload */
|
|
if (payload->num_slots != req_payload.num_slots) {
|
|
|
|
/* need to push an update for this payload */
|
|
if (req_payload.num_slots) {
|
|
drm_dp_create_payload_step1(mgr, vcpi->vcpi,
|
|
&req_payload);
|
|
payload->num_slots = req_payload.num_slots;
|
|
payload->vcpi = req_payload.vcpi;
|
|
|
|
} else if (payload->num_slots) {
|
|
payload->num_slots = 0;
|
|
drm_dp_destroy_payload_step1(mgr, port,
|
|
payload->vcpi,
|
|
payload);
|
|
req_payload.payload_state =
|
|
payload->payload_state;
|
|
payload->start_slot = 0;
|
|
}
|
|
payload->payload_state = req_payload.payload_state;
|
|
}
|
|
cur_slots += req_payload.num_slots;
|
|
|
|
if (put_port)
|
|
drm_dp_mst_topology_put_port(port);
|
|
}
|
|
|
|
for (i = 0; i < mgr->max_payloads; i++) {
|
|
if (mgr->payloads[i].payload_state != DP_PAYLOAD_DELETE_LOCAL)
|
|
continue;
|
|
|
|
DRM_DEBUG_KMS("removing payload %d\n", i);
|
|
for (j = i; j < mgr->max_payloads - 1; j++) {
|
|
mgr->payloads[j] = mgr->payloads[j + 1];
|
|
mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1];
|
|
|
|
if (mgr->proposed_vcpis[j] &&
|
|
mgr->proposed_vcpis[j]->num_slots) {
|
|
set_bit(j + 1, &mgr->payload_mask);
|
|
} else {
|
|
clear_bit(j + 1, &mgr->payload_mask);
|
|
}
|
|
}
|
|
|
|
memset(&mgr->payloads[mgr->max_payloads - 1], 0,
|
|
sizeof(struct drm_dp_payload));
|
|
mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL;
|
|
clear_bit(mgr->max_payloads, &mgr->payload_mask);
|
|
}
|
|
mutex_unlock(&mgr->payload_lock);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_update_payload_part1);
|
|
|
|
/**
|
|
* drm_dp_update_payload_part2() - Execute payload update part 2
|
|
* @mgr: manager to use.
|
|
*
|
|
* This iterates over all proposed virtual channels, and tries to
|
|
* allocate space in the link for them. For 0->slots transitions,
|
|
* this step writes the remote VC payload commands. For slots->0
|
|
* this just resets some internal state.
|
|
*/
|
|
int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
struct drm_dp_mst_port *port;
|
|
int i;
|
|
int ret = 0;
|
|
mutex_lock(&mgr->payload_lock);
|
|
for (i = 0; i < mgr->max_payloads; i++) {
|
|
|
|
if (!mgr->proposed_vcpis[i])
|
|
continue;
|
|
|
|
port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
|
|
|
|
DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state);
|
|
if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) {
|
|
ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
|
|
} else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) {
|
|
ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]);
|
|
}
|
|
if (ret) {
|
|
mutex_unlock(&mgr->payload_lock);
|
|
return ret;
|
|
}
|
|
}
|
|
mutex_unlock(&mgr->payload_lock);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_update_payload_part2);
|
|
|
|
#if 0 /* unused as of yet */
|
|
static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_port *port,
|
|
int offset, int size)
|
|
{
|
|
int len;
|
|
struct drm_dp_sideband_msg_tx *txmsg;
|
|
|
|
txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
|
|
if (!txmsg)
|
|
return -ENOMEM;
|
|
|
|
len = build_dpcd_read(txmsg, port->port_num, 0, 8);
|
|
txmsg->dst = port->parent;
|
|
|
|
drm_dp_queue_down_tx(mgr, txmsg);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_port *port,
|
|
int offset, int size, u8 *bytes)
|
|
{
|
|
int len;
|
|
int ret;
|
|
struct drm_dp_sideband_msg_tx *txmsg;
|
|
struct drm_dp_mst_branch *mstb;
|
|
|
|
mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent);
|
|
if (!mstb)
|
|
return -EINVAL;
|
|
|
|
txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
|
|
if (!txmsg) {
|
|
ret = -ENOMEM;
|
|
goto fail_put;
|
|
}
|
|
|
|
len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes);
|
|
txmsg->dst = mstb;
|
|
|
|
drm_dp_queue_down_tx(mgr, txmsg);
|
|
|
|
ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
|
|
if (ret > 0) {
|
|
if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK)
|
|
ret = -EINVAL;
|
|
else
|
|
ret = 0;
|
|
}
|
|
kfree(txmsg);
|
|
fail_put:
|
|
drm_dp_mst_topology_put_mstb(mstb);
|
|
return ret;
|
|
}
|
|
|
|
static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type)
|
|
{
|
|
struct drm_dp_sideband_msg_reply_body reply;
|
|
|
|
reply.reply_type = DP_SIDEBAND_REPLY_ACK;
|
|
reply.req_type = req_type;
|
|
drm_dp_encode_sideband_reply(&reply, msg);
|
|
return 0;
|
|
}
|
|
|
|
static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_branch *mstb,
|
|
int req_type, int seqno, bool broadcast)
|
|
{
|
|
struct drm_dp_sideband_msg_tx *txmsg;
|
|
|
|
txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
|
|
if (!txmsg)
|
|
return -ENOMEM;
|
|
|
|
txmsg->dst = mstb;
|
|
txmsg->seqno = seqno;
|
|
drm_dp_encode_up_ack_reply(txmsg, req_type);
|
|
|
|
mutex_lock(&mgr->qlock);
|
|
|
|
process_single_up_tx_qlock(mgr, txmsg);
|
|
|
|
mutex_unlock(&mgr->qlock);
|
|
|
|
kfree(txmsg);
|
|
return 0;
|
|
}
|
|
|
|
static bool drm_dp_get_vc_payload_bw(int dp_link_bw,
|
|
int dp_link_count,
|
|
int *out)
|
|
{
|
|
switch (dp_link_bw) {
|
|
default:
|
|
DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n",
|
|
dp_link_bw, dp_link_count);
|
|
return false;
|
|
|
|
case DP_LINK_BW_1_62:
|
|
*out = 3 * dp_link_count;
|
|
break;
|
|
case DP_LINK_BW_2_7:
|
|
*out = 5 * dp_link_count;
|
|
break;
|
|
case DP_LINK_BW_5_4:
|
|
*out = 10 * dp_link_count;
|
|
break;
|
|
case DP_LINK_BW_8_1:
|
|
*out = 15 * dp_link_count;
|
|
break;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager
|
|
* @mgr: manager to set state for
|
|
* @mst_state: true to enable MST on this connector - false to disable.
|
|
*
|
|
* This is called by the driver when it detects an MST capable device plugged
|
|
* into a DP MST capable port, or when a DP MST capable device is unplugged.
|
|
*/
|
|
int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state)
|
|
{
|
|
int ret = 0;
|
|
struct drm_dp_mst_branch *mstb = NULL;
|
|
|
|
mutex_lock(&mgr->lock);
|
|
if (mst_state == mgr->mst_state)
|
|
goto out_unlock;
|
|
|
|
mgr->mst_state = mst_state;
|
|
/* set the device into MST mode */
|
|
if (mst_state) {
|
|
WARN_ON(mgr->mst_primary);
|
|
|
|
/* get dpcd info */
|
|
ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
|
|
if (ret != DP_RECEIVER_CAP_SIZE) {
|
|
DRM_DEBUG_KMS("failed to read DPCD\n");
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1],
|
|
mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK,
|
|
&mgr->pbn_div)) {
|
|
ret = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
|
|
/* add initial branch device at LCT 1 */
|
|
mstb = drm_dp_add_mst_branch_device(1, NULL);
|
|
if (mstb == NULL) {
|
|
ret = -ENOMEM;
|
|
goto out_unlock;
|
|
}
|
|
mstb->mgr = mgr;
|
|
|
|
/* give this the main reference */
|
|
mgr->mst_primary = mstb;
|
|
drm_dp_mst_topology_get_mstb(mgr->mst_primary);
|
|
|
|
ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
|
|
DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
|
|
if (ret < 0) {
|
|
goto out_unlock;
|
|
}
|
|
|
|
{
|
|
struct drm_dp_payload reset_pay;
|
|
reset_pay.start_slot = 0;
|
|
reset_pay.num_slots = 0x3f;
|
|
drm_dp_dpcd_write_payload(mgr, 0, &reset_pay);
|
|
}
|
|
|
|
queue_work(system_long_wq, &mgr->work);
|
|
|
|
ret = 0;
|
|
} else {
|
|
/* disable MST on the device */
|
|
mstb = mgr->mst_primary;
|
|
mgr->mst_primary = NULL;
|
|
/* this can fail if the device is gone */
|
|
drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0);
|
|
ret = 0;
|
|
memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload));
|
|
mgr->payload_mask = 0;
|
|
set_bit(0, &mgr->payload_mask);
|
|
mgr->vcpi_mask = 0;
|
|
}
|
|
|
|
out_unlock:
|
|
mutex_unlock(&mgr->lock);
|
|
if (mstb)
|
|
drm_dp_mst_topology_put_mstb(mstb);
|
|
return ret;
|
|
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst);
|
|
|
|
/**
|
|
* drm_dp_mst_topology_mgr_suspend() - suspend the MST manager
|
|
* @mgr: manager to suspend
|
|
*
|
|
* This function tells the MST device that we can't handle UP messages
|
|
* anymore. This should stop it from sending any since we are suspended.
|
|
*/
|
|
void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
mutex_lock(&mgr->lock);
|
|
drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
|
|
DP_MST_EN | DP_UPSTREAM_IS_SRC);
|
|
mutex_unlock(&mgr->lock);
|
|
flush_work(&mgr->work);
|
|
flush_work(&mgr->destroy_connector_work);
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend);
|
|
|
|
/**
|
|
* drm_dp_mst_topology_mgr_resume() - resume the MST manager
|
|
* @mgr: manager to resume
|
|
*
|
|
* This will fetch DPCD and see if the device is still there,
|
|
* if it is, it will rewrite the MSTM control bits, and return.
|
|
*
|
|
* if the device fails this returns -1, and the driver should do
|
|
* a full MST reprobe, in case we were undocked.
|
|
*/
|
|
int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
int ret = 0;
|
|
|
|
mutex_lock(&mgr->lock);
|
|
|
|
if (mgr->mst_primary) {
|
|
int sret;
|
|
u8 guid[16];
|
|
|
|
sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
|
|
if (sret != DP_RECEIVER_CAP_SIZE) {
|
|
DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n");
|
|
ret = -1;
|
|
goto out_unlock;
|
|
}
|
|
|
|
ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
|
|
DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
|
|
if (ret < 0) {
|
|
DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n");
|
|
ret = -1;
|
|
goto out_unlock;
|
|
}
|
|
|
|
/* Some hubs forget their guids after they resume */
|
|
sret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16);
|
|
if (sret != 16) {
|
|
DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n");
|
|
ret = -1;
|
|
goto out_unlock;
|
|
}
|
|
drm_dp_check_mstb_guid(mgr->mst_primary, guid);
|
|
|
|
ret = 0;
|
|
} else
|
|
ret = -1;
|
|
|
|
out_unlock:
|
|
mutex_unlock(&mgr->lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume);
|
|
|
|
static bool drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up)
|
|
{
|
|
int len;
|
|
u8 replyblock[32];
|
|
int replylen, origlen, curreply;
|
|
int ret;
|
|
struct drm_dp_sideband_msg_rx *msg;
|
|
int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE;
|
|
msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv;
|
|
|
|
len = min(mgr->max_dpcd_transaction_bytes, 16);
|
|
ret = drm_dp_dpcd_read(mgr->aux, basereg,
|
|
replyblock, len);
|
|
if (ret != len) {
|
|
DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret);
|
|
return false;
|
|
}
|
|
ret = drm_dp_sideband_msg_build(msg, replyblock, len, true);
|
|
if (!ret) {
|
|
DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]);
|
|
return false;
|
|
}
|
|
replylen = msg->curchunk_len + msg->curchunk_hdrlen;
|
|
|
|
origlen = replylen;
|
|
replylen -= len;
|
|
curreply = len;
|
|
while (replylen > 0) {
|
|
len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16);
|
|
ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply,
|
|
replyblock, len);
|
|
if (ret != len) {
|
|
DRM_DEBUG_KMS("failed to read a chunk (len %d, ret %d)\n",
|
|
len, ret);
|
|
return false;
|
|
}
|
|
|
|
ret = drm_dp_sideband_msg_build(msg, replyblock, len, false);
|
|
if (!ret) {
|
|
DRM_DEBUG_KMS("failed to build sideband msg\n");
|
|
return false;
|
|
}
|
|
|
|
curreply += len;
|
|
replylen -= len;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!drm_dp_get_one_sb_msg(mgr, false)) {
|
|
memset(&mgr->down_rep_recv, 0,
|
|
sizeof(struct drm_dp_sideband_msg_rx));
|
|
return 0;
|
|
}
|
|
|
|
if (mgr->down_rep_recv.have_eomt) {
|
|
struct drm_dp_sideband_msg_tx *txmsg;
|
|
struct drm_dp_mst_branch *mstb;
|
|
int slot = -1;
|
|
mstb = drm_dp_get_mst_branch_device(mgr,
|
|
mgr->down_rep_recv.initial_hdr.lct,
|
|
mgr->down_rep_recv.initial_hdr.rad);
|
|
|
|
if (!mstb) {
|
|
DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct);
|
|
memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
|
|
return 0;
|
|
}
|
|
|
|
/* find the message */
|
|
slot = mgr->down_rep_recv.initial_hdr.seqno;
|
|
mutex_lock(&mgr->qlock);
|
|
txmsg = mstb->tx_slots[slot];
|
|
/* remove from slots */
|
|
mutex_unlock(&mgr->qlock);
|
|
|
|
if (!txmsg) {
|
|
DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n",
|
|
mstb,
|
|
mgr->down_rep_recv.initial_hdr.seqno,
|
|
mgr->down_rep_recv.initial_hdr.lct,
|
|
mgr->down_rep_recv.initial_hdr.rad[0],
|
|
mgr->down_rep_recv.msg[0]);
|
|
drm_dp_mst_topology_put_mstb(mstb);
|
|
memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
|
|
return 0;
|
|
}
|
|
|
|
drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply);
|
|
|
|
if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK)
|
|
DRM_DEBUG_KMS("Got NAK reply: req 0x%02x (%s), reason 0x%02x (%s), nak data 0x%02x\n",
|
|
txmsg->reply.req_type,
|
|
drm_dp_mst_req_type_str(txmsg->reply.req_type),
|
|
txmsg->reply.u.nak.reason,
|
|
drm_dp_mst_nak_reason_str(txmsg->reply.u.nak.reason),
|
|
txmsg->reply.u.nak.nak_data);
|
|
|
|
memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
|
|
drm_dp_mst_topology_put_mstb(mstb);
|
|
|
|
mutex_lock(&mgr->qlock);
|
|
txmsg->state = DRM_DP_SIDEBAND_TX_RX;
|
|
mstb->tx_slots[slot] = NULL;
|
|
mutex_unlock(&mgr->qlock);
|
|
|
|
wake_up_all(&mgr->tx_waitq);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!drm_dp_get_one_sb_msg(mgr, true)) {
|
|
memset(&mgr->up_req_recv, 0,
|
|
sizeof(struct drm_dp_sideband_msg_rx));
|
|
return 0;
|
|
}
|
|
|
|
if (mgr->up_req_recv.have_eomt) {
|
|
struct drm_dp_sideband_msg_req_body msg;
|
|
struct drm_dp_mst_branch *mstb = NULL;
|
|
bool seqno;
|
|
|
|
if (!mgr->up_req_recv.initial_hdr.broadcast) {
|
|
mstb = drm_dp_get_mst_branch_device(mgr,
|
|
mgr->up_req_recv.initial_hdr.lct,
|
|
mgr->up_req_recv.initial_hdr.rad);
|
|
if (!mstb) {
|
|
DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
|
|
memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
seqno = mgr->up_req_recv.initial_hdr.seqno;
|
|
drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg);
|
|
|
|
if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) {
|
|
drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false);
|
|
|
|
if (!mstb)
|
|
mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.conn_stat.guid);
|
|
|
|
if (!mstb) {
|
|
DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
|
|
memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
|
|
return 0;
|
|
}
|
|
|
|
drm_dp_update_port(mstb, &msg.u.conn_stat);
|
|
|
|
DRM_DEBUG_KMS("Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n", msg.u.conn_stat.port_number, msg.u.conn_stat.legacy_device_plug_status, msg.u.conn_stat.displayport_device_plug_status, msg.u.conn_stat.message_capability_status, msg.u.conn_stat.input_port, msg.u.conn_stat.peer_device_type);
|
|
drm_kms_helper_hotplug_event(mgr->dev);
|
|
|
|
} else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) {
|
|
drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false);
|
|
if (!mstb)
|
|
mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.resource_stat.guid);
|
|
|
|
if (!mstb) {
|
|
DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct);
|
|
memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
|
|
return 0;
|
|
}
|
|
|
|
DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn);
|
|
}
|
|
|
|
if (mstb)
|
|
drm_dp_mst_topology_put_mstb(mstb);
|
|
|
|
memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx));
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* drm_dp_mst_hpd_irq() - MST hotplug IRQ notify
|
|
* @mgr: manager to notify irq for.
|
|
* @esi: 4 bytes from SINK_COUNT_ESI
|
|
* @handled: whether the hpd interrupt was consumed or not
|
|
*
|
|
* This should be called from the driver when it detects a short IRQ,
|
|
* along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The
|
|
* topology manager will process the sideband messages received as a result
|
|
* of this.
|
|
*/
|
|
int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled)
|
|
{
|
|
int ret = 0;
|
|
int sc;
|
|
*handled = false;
|
|
sc = esi[0] & 0x3f;
|
|
|
|
if (sc != mgr->sink_count) {
|
|
mgr->sink_count = sc;
|
|
*handled = true;
|
|
}
|
|
|
|
if (esi[1] & DP_DOWN_REP_MSG_RDY) {
|
|
ret = drm_dp_mst_handle_down_rep(mgr);
|
|
*handled = true;
|
|
}
|
|
|
|
if (esi[1] & DP_UP_REQ_MSG_RDY) {
|
|
ret |= drm_dp_mst_handle_up_req(mgr);
|
|
*handled = true;
|
|
}
|
|
|
|
drm_dp_mst_kick_tx(mgr);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_hpd_irq);
|
|
|
|
/**
|
|
* drm_dp_mst_detect_port() - get connection status for an MST port
|
|
* @connector: DRM connector for this port
|
|
* @mgr: manager for this port
|
|
* @port: unverified pointer to a port
|
|
*
|
|
* This returns the current connection state for a port. It validates the
|
|
* port pointer still exists so the caller doesn't require a reference
|
|
*/
|
|
enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector,
|
|
struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
|
|
{
|
|
enum drm_connector_status status = connector_status_disconnected;
|
|
|
|
/* we need to search for the port in the mgr in case it's gone */
|
|
port = drm_dp_mst_topology_get_port_validated(mgr, port);
|
|
if (!port)
|
|
return connector_status_disconnected;
|
|
|
|
if (!port->ddps)
|
|
goto out;
|
|
|
|
switch (port->pdt) {
|
|
case DP_PEER_DEVICE_NONE:
|
|
case DP_PEER_DEVICE_MST_BRANCHING:
|
|
break;
|
|
|
|
case DP_PEER_DEVICE_SST_SINK:
|
|
status = connector_status_connected;
|
|
/* for logical ports - cache the EDID */
|
|
if (port->port_num >= 8 && !port->cached_edid) {
|
|
port->cached_edid = drm_get_edid(connector, &port->aux.ddc);
|
|
}
|
|
break;
|
|
case DP_PEER_DEVICE_DP_LEGACY_CONV:
|
|
if (port->ldps)
|
|
status = connector_status_connected;
|
|
break;
|
|
}
|
|
out:
|
|
drm_dp_mst_topology_put_port(port);
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_detect_port);
|
|
|
|
/**
|
|
* drm_dp_mst_port_has_audio() - Check whether port has audio capability or not
|
|
* @mgr: manager for this port
|
|
* @port: unverified pointer to a port.
|
|
*
|
|
* This returns whether the port supports audio or not.
|
|
*/
|
|
bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_port *port)
|
|
{
|
|
bool ret = false;
|
|
|
|
port = drm_dp_mst_topology_get_port_validated(mgr, port);
|
|
if (!port)
|
|
return ret;
|
|
ret = port->has_audio;
|
|
drm_dp_mst_topology_put_port(port);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_port_has_audio);
|
|
|
|
/**
|
|
* drm_dp_mst_get_edid() - get EDID for an MST port
|
|
* @connector: toplevel connector to get EDID for
|
|
* @mgr: manager for this port
|
|
* @port: unverified pointer to a port.
|
|
*
|
|
* This returns an EDID for the port connected to a connector,
|
|
* It validates the pointer still exists so the caller doesn't require a
|
|
* reference.
|
|
*/
|
|
struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
|
|
{
|
|
struct edid *edid = NULL;
|
|
|
|
/* we need to search for the port in the mgr in case it's gone */
|
|
port = drm_dp_mst_topology_get_port_validated(mgr, port);
|
|
if (!port)
|
|
return NULL;
|
|
|
|
if (port->cached_edid)
|
|
edid = drm_edid_duplicate(port->cached_edid);
|
|
else {
|
|
edid = drm_get_edid(connector, &port->aux.ddc);
|
|
}
|
|
port->has_audio = drm_detect_monitor_audio(edid);
|
|
drm_dp_mst_topology_put_port(port);
|
|
return edid;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_get_edid);
|
|
|
|
/**
|
|
* drm_dp_find_vcpi_slots() - Find VCPI slots for this PBN value
|
|
* @mgr: manager to use
|
|
* @pbn: payload bandwidth to convert into slots.
|
|
*
|
|
* Calculate the number of VCPI slots that will be required for the given PBN
|
|
* value. This function is deprecated, and should not be used in atomic
|
|
* drivers.
|
|
*
|
|
* RETURNS:
|
|
* The total slots required for this port, or error.
|
|
*/
|
|
int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
|
|
int pbn)
|
|
{
|
|
int num_slots;
|
|
|
|
num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
|
|
|
|
/* max. time slots - one slot for MTP header */
|
|
if (num_slots > 63)
|
|
return -ENOSPC;
|
|
return num_slots;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_find_vcpi_slots);
|
|
|
|
static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_vcpi *vcpi, int pbn, int slots)
|
|
{
|
|
int ret;
|
|
|
|
/* max. time slots - one slot for MTP header */
|
|
if (slots > 63)
|
|
return -ENOSPC;
|
|
|
|
vcpi->pbn = pbn;
|
|
vcpi->aligned_pbn = slots * mgr->pbn_div;
|
|
vcpi->num_slots = slots;
|
|
|
|
ret = drm_dp_mst_assign_payload_id(mgr, vcpi);
|
|
if (ret < 0)
|
|
return ret;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* drm_dp_atomic_find_vcpi_slots() - Find and add VCPI slots to the state
|
|
* @state: global atomic state
|
|
* @mgr: MST topology manager for the port
|
|
* @port: port to find vcpi slots for
|
|
* @pbn: bandwidth required for the mode in PBN
|
|
*
|
|
* Allocates VCPI slots to @port, replacing any previous VCPI allocations it
|
|
* may have had. Any atomic drivers which support MST must call this function
|
|
* in their &drm_encoder_helper_funcs.atomic_check() callback to change the
|
|
* current VCPI allocation for the new state, but only when
|
|
* &drm_crtc_state.mode_changed or &drm_crtc_state.connectors_changed is set
|
|
* to ensure compatibility with userspace applications that still use the
|
|
* legacy modesetting UAPI.
|
|
*
|
|
* Allocations set by this function are not checked against the bandwidth
|
|
* restraints of @mgr until the driver calls drm_dp_mst_atomic_check().
|
|
*
|
|
* Additionally, it is OK to call this function multiple times on the same
|
|
* @port as needed. It is not OK however, to call this function and
|
|
* drm_dp_atomic_release_vcpi_slots() in the same atomic check phase.
|
|
*
|
|
* See also:
|
|
* drm_dp_atomic_release_vcpi_slots()
|
|
* drm_dp_mst_atomic_check()
|
|
*
|
|
* Returns:
|
|
* Total slots in the atomic state assigned for this port, or a negative error
|
|
* code if the port no longer exists
|
|
*/
|
|
int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
|
|
struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_port *port, int pbn)
|
|
{
|
|
struct drm_dp_mst_topology_state *topology_state;
|
|
struct drm_dp_vcpi_allocation *pos, *vcpi = NULL;
|
|
int prev_slots, req_slots, ret;
|
|
|
|
topology_state = drm_atomic_get_mst_topology_state(state, mgr);
|
|
if (IS_ERR(topology_state))
|
|
return PTR_ERR(topology_state);
|
|
|
|
/* Find the current allocation for this port, if any */
|
|
list_for_each_entry(pos, &topology_state->vcpis, next) {
|
|
if (pos->port == port) {
|
|
vcpi = pos;
|
|
prev_slots = vcpi->vcpi;
|
|
|
|
/*
|
|
* This should never happen, unless the driver tries
|
|
* releasing and allocating the same VCPI allocation,
|
|
* which is an error
|
|
*/
|
|
if (WARN_ON(!prev_slots)) {
|
|
DRM_ERROR("cannot allocate and release VCPI on [MST PORT:%p] in the same state\n",
|
|
port);
|
|
return -EINVAL;
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
if (!vcpi)
|
|
prev_slots = 0;
|
|
|
|
req_slots = DIV_ROUND_UP(pbn, mgr->pbn_div);
|
|
|
|
DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] [MST PORT:%p] VCPI %d -> %d\n",
|
|
port->connector->base.id, port->connector->name,
|
|
port, prev_slots, req_slots);
|
|
|
|
/* Add the new allocation to the state */
|
|
if (!vcpi) {
|
|
vcpi = kzalloc(sizeof(*vcpi), GFP_KERNEL);
|
|
if (!vcpi)
|
|
return -ENOMEM;
|
|
|
|
drm_dp_mst_get_port_malloc(port);
|
|
vcpi->port = port;
|
|
list_add(&vcpi->next, &topology_state->vcpis);
|
|
}
|
|
vcpi->vcpi = req_slots;
|
|
|
|
ret = req_slots;
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_atomic_find_vcpi_slots);
|
|
|
|
/**
|
|
* drm_dp_atomic_release_vcpi_slots() - Release allocated vcpi slots
|
|
* @state: global atomic state
|
|
* @mgr: MST topology manager for the port
|
|
* @port: The port to release the VCPI slots from
|
|
*
|
|
* Releases any VCPI slots that have been allocated to a port in the atomic
|
|
* state. Any atomic drivers which support MST must call this function in
|
|
* their &drm_connector_helper_funcs.atomic_check() callback when the
|
|
* connector will no longer have VCPI allocated (e.g. because its CRTC was
|
|
* removed) when it had VCPI allocated in the previous atomic state.
|
|
*
|
|
* It is OK to call this even if @port has been removed from the system.
|
|
* Additionally, it is OK to call this function multiple times on the same
|
|
* @port as needed. It is not OK however, to call this function and
|
|
* drm_dp_atomic_find_vcpi_slots() on the same @port in a single atomic check
|
|
* phase.
|
|
*
|
|
* See also:
|
|
* drm_dp_atomic_find_vcpi_slots()
|
|
* drm_dp_mst_atomic_check()
|
|
*
|
|
* Returns:
|
|
* 0 if all slots for this port were added back to
|
|
* &drm_dp_mst_topology_state.avail_slots or negative error code
|
|
*/
|
|
int drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
|
|
struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_port *port)
|
|
{
|
|
struct drm_dp_mst_topology_state *topology_state;
|
|
struct drm_dp_vcpi_allocation *pos;
|
|
bool found = false;
|
|
|
|
topology_state = drm_atomic_get_mst_topology_state(state, mgr);
|
|
if (IS_ERR(topology_state))
|
|
return PTR_ERR(topology_state);
|
|
|
|
list_for_each_entry(pos, &topology_state->vcpis, next) {
|
|
if (pos->port == port) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
if (WARN_ON(!found)) {
|
|
DRM_ERROR("no VCPI for [MST PORT:%p] found in mst state %p\n",
|
|
port, &topology_state->base);
|
|
return -EINVAL;
|
|
}
|
|
|
|
DRM_DEBUG_ATOMIC("[MST PORT:%p] VCPI %d -> 0\n", port, pos->vcpi);
|
|
if (pos->vcpi) {
|
|
drm_dp_mst_put_port_malloc(port);
|
|
pos->vcpi = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_atomic_release_vcpi_slots);
|
|
|
|
/**
|
|
* drm_dp_mst_allocate_vcpi() - Allocate a virtual channel
|
|
* @mgr: manager for this port
|
|
* @port: port to allocate a virtual channel for.
|
|
* @pbn: payload bandwidth number to request
|
|
* @slots: returned number of slots for this PBN.
|
|
*/
|
|
bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_port *port, int pbn, int slots)
|
|
{
|
|
int ret;
|
|
|
|
port = drm_dp_mst_topology_get_port_validated(mgr, port);
|
|
if (!port)
|
|
return false;
|
|
|
|
if (slots < 0)
|
|
return false;
|
|
|
|
if (port->vcpi.vcpi > 0) {
|
|
DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n",
|
|
port->vcpi.vcpi, port->vcpi.pbn, pbn);
|
|
if (pbn == port->vcpi.pbn) {
|
|
drm_dp_mst_topology_put_port(port);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn, slots);
|
|
if (ret) {
|
|
DRM_DEBUG_KMS("failed to init vcpi slots=%d max=63 ret=%d\n",
|
|
DIV_ROUND_UP(pbn, mgr->pbn_div), ret);
|
|
goto out;
|
|
}
|
|
DRM_DEBUG_KMS("initing vcpi for pbn=%d slots=%d\n",
|
|
pbn, port->vcpi.num_slots);
|
|
|
|
/* Keep port allocated until its payload has been removed */
|
|
drm_dp_mst_get_port_malloc(port);
|
|
drm_dp_mst_topology_put_port(port);
|
|
return true;
|
|
out:
|
|
return false;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi);
|
|
|
|
int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
|
|
{
|
|
int slots = 0;
|
|
port = drm_dp_mst_topology_get_port_validated(mgr, port);
|
|
if (!port)
|
|
return slots;
|
|
|
|
slots = port->vcpi.num_slots;
|
|
drm_dp_mst_topology_put_port(port);
|
|
return slots;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots);
|
|
|
|
/**
|
|
* drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI
|
|
* @mgr: manager for this port
|
|
* @port: unverified pointer to a port.
|
|
*
|
|
* This just resets the number of slots for the ports VCPI for later programming.
|
|
*/
|
|
void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
|
|
{
|
|
/*
|
|
* A port with VCPI will remain allocated until its VCPI is
|
|
* released, no verified ref needed
|
|
*/
|
|
|
|
port->vcpi.num_slots = 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots);
|
|
|
|
/**
|
|
* drm_dp_mst_deallocate_vcpi() - deallocate a VCPI
|
|
* @mgr: manager for this port
|
|
* @port: port to deallocate vcpi for
|
|
*
|
|
* This can be called unconditionally, regardless of whether
|
|
* drm_dp_mst_allocate_vcpi() succeeded or not.
|
|
*/
|
|
void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_port *port)
|
|
{
|
|
if (!port->vcpi.vcpi)
|
|
return;
|
|
|
|
drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi);
|
|
port->vcpi.num_slots = 0;
|
|
port->vcpi.pbn = 0;
|
|
port->vcpi.aligned_pbn = 0;
|
|
port->vcpi.vcpi = 0;
|
|
drm_dp_mst_put_port_malloc(port);
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi);
|
|
|
|
static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr,
|
|
int id, struct drm_dp_payload *payload)
|
|
{
|
|
u8 payload_alloc[3], status;
|
|
int ret;
|
|
int retries = 0;
|
|
|
|
drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS,
|
|
DP_PAYLOAD_TABLE_UPDATED);
|
|
|
|
payload_alloc[0] = id;
|
|
payload_alloc[1] = payload->start_slot;
|
|
payload_alloc[2] = payload->num_slots;
|
|
|
|
ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3);
|
|
if (ret != 3) {
|
|
DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret);
|
|
goto fail;
|
|
}
|
|
|
|
retry:
|
|
ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
|
|
if (ret < 0) {
|
|
DRM_DEBUG_KMS("failed to read payload table status %d\n", ret);
|
|
goto fail;
|
|
}
|
|
|
|
if (!(status & DP_PAYLOAD_TABLE_UPDATED)) {
|
|
retries++;
|
|
if (retries < 20) {
|
|
usleep_range(10000, 20000);
|
|
goto retry;
|
|
}
|
|
DRM_DEBUG_KMS("status not set after read payload table status %d\n", status);
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
ret = 0;
|
|
fail:
|
|
return ret;
|
|
}
|
|
|
|
|
|
/**
|
|
* drm_dp_check_act_status() - Check ACT handled status.
|
|
* @mgr: manager to use
|
|
*
|
|
* Check the payload status bits in the DPCD for ACT handled completion.
|
|
*/
|
|
int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
u8 status;
|
|
int ret;
|
|
int count = 0;
|
|
|
|
do {
|
|
ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status);
|
|
|
|
if (ret < 0) {
|
|
DRM_DEBUG_KMS("failed to read payload table status %d\n", ret);
|
|
goto fail;
|
|
}
|
|
|
|
if (status & DP_PAYLOAD_ACT_HANDLED)
|
|
break;
|
|
count++;
|
|
udelay(100);
|
|
|
|
} while (count < 30);
|
|
|
|
if (!(status & DP_PAYLOAD_ACT_HANDLED)) {
|
|
DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count);
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
return 0;
|
|
fail:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_check_act_status);
|
|
|
|
/**
|
|
* drm_dp_calc_pbn_mode() - Calculate the PBN for a mode.
|
|
* @clock: dot clock for the mode
|
|
* @bpp: bpp for the mode.
|
|
*
|
|
* This uses the formula in the spec to calculate the PBN value for a mode.
|
|
*/
|
|
int drm_dp_calc_pbn_mode(int clock, int bpp)
|
|
{
|
|
u64 kbps;
|
|
s64 peak_kbps;
|
|
u32 numerator;
|
|
u32 denominator;
|
|
|
|
kbps = clock * bpp;
|
|
|
|
/*
|
|
* margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006
|
|
* The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on
|
|
* common multiplier to render an integer PBN for all link rate/lane
|
|
* counts combinations
|
|
* calculate
|
|
* peak_kbps *= (1006/1000)
|
|
* peak_kbps *= (64/54)
|
|
* peak_kbps *= 8 convert to bytes
|
|
*/
|
|
|
|
numerator = 64 * 1006;
|
|
denominator = 54 * 8 * 1000 * 1000;
|
|
|
|
kbps *= numerator;
|
|
peak_kbps = drm_fixp_from_fraction(kbps, denominator);
|
|
|
|
return drm_fixp2int_ceil(peak_kbps);
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_calc_pbn_mode);
|
|
|
|
static int test_calc_pbn_mode(void)
|
|
{
|
|
int ret;
|
|
ret = drm_dp_calc_pbn_mode(154000, 30);
|
|
if (ret != 689) {
|
|
DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
|
|
154000, 30, 689, ret);
|
|
return -EINVAL;
|
|
}
|
|
ret = drm_dp_calc_pbn_mode(234000, 30);
|
|
if (ret != 1047) {
|
|
DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
|
|
234000, 30, 1047, ret);
|
|
return -EINVAL;
|
|
}
|
|
ret = drm_dp_calc_pbn_mode(297000, 24);
|
|
if (ret != 1063) {
|
|
DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n",
|
|
297000, 24, 1063, ret);
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* we want to kick the TX after we've ack the up/down IRQs. */
|
|
static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
queue_work(system_long_wq, &mgr->tx_work);
|
|
}
|
|
|
|
static void drm_dp_mst_dump_mstb(struct seq_file *m,
|
|
struct drm_dp_mst_branch *mstb)
|
|
{
|
|
struct drm_dp_mst_port *port;
|
|
int tabs = mstb->lct;
|
|
char prefix[10];
|
|
int i;
|
|
|
|
for (i = 0; i < tabs; i++)
|
|
prefix[i] = '\t';
|
|
prefix[i] = '\0';
|
|
|
|
seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports);
|
|
list_for_each_entry(port, &mstb->ports, next) {
|
|
seq_printf(m, "%sport: %d: input: %d: pdt: %d, ddps: %d ldps: %d, sdp: %d/%d, %p, conn: %p\n", prefix, port->port_num, port->input, port->pdt, port->ddps, port->ldps, port->num_sdp_streams, port->num_sdp_stream_sinks, port, port->connector);
|
|
if (port->mstb)
|
|
drm_dp_mst_dump_mstb(m, port->mstb);
|
|
}
|
|
}
|
|
|
|
#define DP_PAYLOAD_TABLE_SIZE 64
|
|
|
|
static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr,
|
|
char *buf)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < DP_PAYLOAD_TABLE_SIZE; i += 16) {
|
|
if (drm_dp_dpcd_read(mgr->aux,
|
|
DP_PAYLOAD_TABLE_UPDATE_STATUS + i,
|
|
&buf[i], 16) != 16)
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static void fetch_monitor_name(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_port *port, char *name,
|
|
int namelen)
|
|
{
|
|
struct edid *mst_edid;
|
|
|
|
mst_edid = drm_dp_mst_get_edid(port->connector, mgr, port);
|
|
drm_edid_get_monitor_name(mst_edid, name, namelen);
|
|
}
|
|
|
|
/**
|
|
* drm_dp_mst_dump_topology(): dump topology to seq file.
|
|
* @m: seq_file to dump output to
|
|
* @mgr: manager to dump current topology for.
|
|
*
|
|
* helper to dump MST topology to a seq file for debugfs.
|
|
*/
|
|
void drm_dp_mst_dump_topology(struct seq_file *m,
|
|
struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
int i;
|
|
struct drm_dp_mst_port *port;
|
|
|
|
mutex_lock(&mgr->lock);
|
|
if (mgr->mst_primary)
|
|
drm_dp_mst_dump_mstb(m, mgr->mst_primary);
|
|
|
|
/* dump VCPIs */
|
|
mutex_unlock(&mgr->lock);
|
|
|
|
mutex_lock(&mgr->payload_lock);
|
|
seq_printf(m, "vcpi: %lx %lx %d\n", mgr->payload_mask, mgr->vcpi_mask,
|
|
mgr->max_payloads);
|
|
|
|
for (i = 0; i < mgr->max_payloads; i++) {
|
|
if (mgr->proposed_vcpis[i]) {
|
|
char name[14];
|
|
|
|
port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi);
|
|
fetch_monitor_name(mgr, port, name, sizeof(name));
|
|
seq_printf(m, "vcpi %d: %d %d %d sink name: %s\n", i,
|
|
port->port_num, port->vcpi.vcpi,
|
|
port->vcpi.num_slots,
|
|
(*name != 0) ? name : "Unknown");
|
|
} else
|
|
seq_printf(m, "vcpi %d:unused\n", i);
|
|
}
|
|
for (i = 0; i < mgr->max_payloads; i++) {
|
|
seq_printf(m, "payload %d: %d, %d, %d\n",
|
|
i,
|
|
mgr->payloads[i].payload_state,
|
|
mgr->payloads[i].start_slot,
|
|
mgr->payloads[i].num_slots);
|
|
|
|
|
|
}
|
|
mutex_unlock(&mgr->payload_lock);
|
|
|
|
mutex_lock(&mgr->lock);
|
|
if (mgr->mst_primary) {
|
|
u8 buf[DP_PAYLOAD_TABLE_SIZE];
|
|
int ret;
|
|
|
|
ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE);
|
|
seq_printf(m, "dpcd: %*ph\n", DP_RECEIVER_CAP_SIZE, buf);
|
|
ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2);
|
|
seq_printf(m, "faux/mst: %*ph\n", 2, buf);
|
|
ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1);
|
|
seq_printf(m, "mst ctrl: %*ph\n", 1, buf);
|
|
|
|
/* dump the standard OUI branch header */
|
|
ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE);
|
|
seq_printf(m, "branch oui: %*phN devid: ", 3, buf);
|
|
for (i = 0x3; i < 0x8 && buf[i]; i++)
|
|
seq_printf(m, "%c", buf[i]);
|
|
seq_printf(m, " revision: hw: %x.%x sw: %x.%x\n",
|
|
buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]);
|
|
if (dump_dp_payload_table(mgr, buf))
|
|
seq_printf(m, "payload table: %*ph\n", DP_PAYLOAD_TABLE_SIZE, buf);
|
|
}
|
|
|
|
mutex_unlock(&mgr->lock);
|
|
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_dump_topology);
|
|
|
|
static void drm_dp_tx_work(struct work_struct *work)
|
|
{
|
|
struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work);
|
|
|
|
mutex_lock(&mgr->qlock);
|
|
if (!list_empty(&mgr->tx_msg_downq))
|
|
process_single_down_tx_qlock(mgr);
|
|
mutex_unlock(&mgr->qlock);
|
|
}
|
|
|
|
static void drm_dp_destroy_connector_work(struct work_struct *work)
|
|
{
|
|
struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, destroy_connector_work);
|
|
struct drm_dp_mst_port *port;
|
|
bool send_hotplug = false;
|
|
/*
|
|
* Not a regular list traverse as we have to drop the destroy
|
|
* connector lock before destroying the connector, to avoid AB->BA
|
|
* ordering between this lock and the config mutex.
|
|
*/
|
|
for (;;) {
|
|
mutex_lock(&mgr->destroy_connector_lock);
|
|
port = list_first_entry_or_null(&mgr->destroy_connector_list, struct drm_dp_mst_port, next);
|
|
if (!port) {
|
|
mutex_unlock(&mgr->destroy_connector_lock);
|
|
break;
|
|
}
|
|
list_del(&port->next);
|
|
mutex_unlock(&mgr->destroy_connector_lock);
|
|
|
|
INIT_LIST_HEAD(&port->next);
|
|
|
|
mgr->cbs->destroy_connector(mgr, port->connector);
|
|
|
|
drm_dp_port_teardown_pdt(port, port->pdt);
|
|
port->pdt = DP_PEER_DEVICE_NONE;
|
|
|
|
drm_dp_mst_put_port_malloc(port);
|
|
send_hotplug = true;
|
|
}
|
|
if (send_hotplug)
|
|
drm_kms_helper_hotplug_event(mgr->dev);
|
|
}
|
|
|
|
static struct drm_private_state *
|
|
drm_dp_mst_duplicate_state(struct drm_private_obj *obj)
|
|
{
|
|
struct drm_dp_mst_topology_state *state, *old_state =
|
|
to_dp_mst_topology_state(obj->state);
|
|
struct drm_dp_vcpi_allocation *pos, *vcpi;
|
|
|
|
state = kmemdup(old_state, sizeof(*state), GFP_KERNEL);
|
|
if (!state)
|
|
return NULL;
|
|
|
|
__drm_atomic_helper_private_obj_duplicate_state(obj, &state->base);
|
|
|
|
INIT_LIST_HEAD(&state->vcpis);
|
|
|
|
list_for_each_entry(pos, &old_state->vcpis, next) {
|
|
/* Prune leftover freed VCPI allocations */
|
|
if (!pos->vcpi)
|
|
continue;
|
|
|
|
vcpi = kmemdup(pos, sizeof(*vcpi), GFP_KERNEL);
|
|
if (!vcpi)
|
|
goto fail;
|
|
|
|
drm_dp_mst_get_port_malloc(vcpi->port);
|
|
list_add(&vcpi->next, &state->vcpis);
|
|
}
|
|
|
|
return &state->base;
|
|
|
|
fail:
|
|
list_for_each_entry_safe(pos, vcpi, &state->vcpis, next) {
|
|
drm_dp_mst_put_port_malloc(pos->port);
|
|
kfree(pos);
|
|
}
|
|
kfree(state);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void drm_dp_mst_destroy_state(struct drm_private_obj *obj,
|
|
struct drm_private_state *state)
|
|
{
|
|
struct drm_dp_mst_topology_state *mst_state =
|
|
to_dp_mst_topology_state(state);
|
|
struct drm_dp_vcpi_allocation *pos, *tmp;
|
|
|
|
list_for_each_entry_safe(pos, tmp, &mst_state->vcpis, next) {
|
|
/* We only keep references to ports with non-zero VCPIs */
|
|
if (pos->vcpi)
|
|
drm_dp_mst_put_port_malloc(pos->port);
|
|
kfree(pos);
|
|
}
|
|
|
|
kfree(mst_state);
|
|
}
|
|
|
|
static inline int
|
|
drm_dp_mst_atomic_check_topology_state(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_dp_mst_topology_state *mst_state)
|
|
{
|
|
struct drm_dp_vcpi_allocation *vcpi;
|
|
int avail_slots = 63, payload_count = 0;
|
|
|
|
list_for_each_entry(vcpi, &mst_state->vcpis, next) {
|
|
/* Releasing VCPI is always OK-even if the port is gone */
|
|
if (!vcpi->vcpi) {
|
|
DRM_DEBUG_ATOMIC("[MST PORT:%p] releases all VCPI slots\n",
|
|
vcpi->port);
|
|
continue;
|
|
}
|
|
|
|
DRM_DEBUG_ATOMIC("[MST PORT:%p] requires %d vcpi slots\n",
|
|
vcpi->port, vcpi->vcpi);
|
|
|
|
avail_slots -= vcpi->vcpi;
|
|
if (avail_slots < 0) {
|
|
DRM_DEBUG_ATOMIC("[MST PORT:%p] not enough VCPI slots in mst state %p (avail=%d)\n",
|
|
vcpi->port, mst_state,
|
|
avail_slots + vcpi->vcpi);
|
|
return -ENOSPC;
|
|
}
|
|
|
|
if (++payload_count > mgr->max_payloads) {
|
|
DRM_DEBUG_ATOMIC("[MST MGR:%p] state %p has too many payloads (max=%d)\n",
|
|
mgr, mst_state, mgr->max_payloads);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
DRM_DEBUG_ATOMIC("[MST MGR:%p] mst state %p VCPI avail=%d used=%d\n",
|
|
mgr, mst_state, avail_slots,
|
|
63 - avail_slots);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* drm_dp_mst_atomic_check - Check that the new state of an MST topology in an
|
|
* atomic update is valid
|
|
* @state: Pointer to the new &struct drm_dp_mst_topology_state
|
|
*
|
|
* Checks the given topology state for an atomic update to ensure that it's
|
|
* valid. This includes checking whether there's enough bandwidth to support
|
|
* the new VCPI allocations in the atomic update.
|
|
*
|
|
* Any atomic drivers supporting DP MST must make sure to call this after
|
|
* checking the rest of their state in their
|
|
* &drm_mode_config_funcs.atomic_check() callback.
|
|
*
|
|
* See also:
|
|
* drm_dp_atomic_find_vcpi_slots()
|
|
* drm_dp_atomic_release_vcpi_slots()
|
|
*
|
|
* Returns:
|
|
*
|
|
* 0 if the new state is valid, negative error code otherwise.
|
|
*/
|
|
int drm_dp_mst_atomic_check(struct drm_atomic_state *state)
|
|
{
|
|
struct drm_dp_mst_topology_mgr *mgr;
|
|
struct drm_dp_mst_topology_state *mst_state;
|
|
int i, ret = 0;
|
|
|
|
for_each_new_mst_mgr_in_state(state, mgr, mst_state, i) {
|
|
ret = drm_dp_mst_atomic_check_topology_state(mgr, mst_state);
|
|
if (ret)
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_atomic_check);
|
|
|
|
const struct drm_private_state_funcs drm_dp_mst_topology_state_funcs = {
|
|
.atomic_duplicate_state = drm_dp_mst_duplicate_state,
|
|
.atomic_destroy_state = drm_dp_mst_destroy_state,
|
|
};
|
|
EXPORT_SYMBOL(drm_dp_mst_topology_state_funcs);
|
|
|
|
/**
|
|
* drm_atomic_get_mst_topology_state: get MST topology state
|
|
*
|
|
* @state: global atomic state
|
|
* @mgr: MST topology manager, also the private object in this case
|
|
*
|
|
* This function wraps drm_atomic_get_priv_obj_state() passing in the MST atomic
|
|
* state vtable so that the private object state returned is that of a MST
|
|
* topology object. Also, drm_atomic_get_private_obj_state() expects the caller
|
|
* to care of the locking, so warn if don't hold the connection_mutex.
|
|
*
|
|
* RETURNS:
|
|
*
|
|
* The MST topology state or error pointer.
|
|
*/
|
|
struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
|
|
struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
struct drm_device *dev = mgr->dev;
|
|
|
|
WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
|
|
return to_dp_mst_topology_state(drm_atomic_get_private_obj_state(state, &mgr->base));
|
|
}
|
|
EXPORT_SYMBOL(drm_atomic_get_mst_topology_state);
|
|
|
|
/**
|
|
* drm_dp_mst_topology_mgr_init - initialise a topology manager
|
|
* @mgr: manager struct to initialise
|
|
* @dev: device providing this structure - for i2c addition.
|
|
* @aux: DP helper aux channel to talk to this device
|
|
* @max_dpcd_transaction_bytes: hw specific DPCD transaction limit
|
|
* @max_payloads: maximum number of payloads this GPU can source
|
|
* @conn_base_id: the connector object ID the MST device is connected to.
|
|
*
|
|
* Return 0 for success, or negative error code on failure
|
|
*/
|
|
int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
|
|
struct drm_device *dev, struct drm_dp_aux *aux,
|
|
int max_dpcd_transaction_bytes,
|
|
int max_payloads, int conn_base_id)
|
|
{
|
|
struct drm_dp_mst_topology_state *mst_state;
|
|
|
|
mutex_init(&mgr->lock);
|
|
mutex_init(&mgr->qlock);
|
|
mutex_init(&mgr->payload_lock);
|
|
mutex_init(&mgr->destroy_connector_lock);
|
|
INIT_LIST_HEAD(&mgr->tx_msg_downq);
|
|
INIT_LIST_HEAD(&mgr->destroy_connector_list);
|
|
INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work);
|
|
INIT_WORK(&mgr->tx_work, drm_dp_tx_work);
|
|
INIT_WORK(&mgr->destroy_connector_work, drm_dp_destroy_connector_work);
|
|
init_waitqueue_head(&mgr->tx_waitq);
|
|
mgr->dev = dev;
|
|
mgr->aux = aux;
|
|
mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes;
|
|
mgr->max_payloads = max_payloads;
|
|
mgr->conn_base_id = conn_base_id;
|
|
if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 ||
|
|
max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8)
|
|
return -EINVAL;
|
|
mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL);
|
|
if (!mgr->payloads)
|
|
return -ENOMEM;
|
|
mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL);
|
|
if (!mgr->proposed_vcpis)
|
|
return -ENOMEM;
|
|
set_bit(0, &mgr->payload_mask);
|
|
if (test_calc_pbn_mode() < 0)
|
|
DRM_ERROR("MST PBN self-test failed\n");
|
|
|
|
mst_state = kzalloc(sizeof(*mst_state), GFP_KERNEL);
|
|
if (mst_state == NULL)
|
|
return -ENOMEM;
|
|
|
|
mst_state->mgr = mgr;
|
|
INIT_LIST_HEAD(&mst_state->vcpis);
|
|
|
|
drm_atomic_private_obj_init(dev, &mgr->base,
|
|
&mst_state->base,
|
|
&drm_dp_mst_topology_state_funcs);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init);
|
|
|
|
/**
|
|
* drm_dp_mst_topology_mgr_destroy() - destroy topology manager.
|
|
* @mgr: manager to destroy
|
|
*/
|
|
void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr)
|
|
{
|
|
drm_dp_mst_topology_mgr_set_mst(mgr, false);
|
|
flush_work(&mgr->work);
|
|
flush_work(&mgr->destroy_connector_work);
|
|
mutex_lock(&mgr->payload_lock);
|
|
kfree(mgr->payloads);
|
|
mgr->payloads = NULL;
|
|
kfree(mgr->proposed_vcpis);
|
|
mgr->proposed_vcpis = NULL;
|
|
mutex_unlock(&mgr->payload_lock);
|
|
mgr->dev = NULL;
|
|
mgr->aux = NULL;
|
|
drm_atomic_private_obj_fini(&mgr->base);
|
|
mgr->funcs = NULL;
|
|
}
|
|
EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy);
|
|
|
|
static bool remote_i2c_read_ok(const struct i2c_msg msgs[], int num)
|
|
{
|
|
int i;
|
|
|
|
if (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)
|
|
return false;
|
|
|
|
for (i = 0; i < num - 1; i++) {
|
|
if (msgs[i].flags & I2C_M_RD ||
|
|
msgs[i].len > 0xff)
|
|
return false;
|
|
}
|
|
|
|
return msgs[num - 1].flags & I2C_M_RD &&
|
|
msgs[num - 1].len <= 0xff;
|
|
}
|
|
|
|
/* I2C device */
|
|
static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
|
|
int num)
|
|
{
|
|
struct drm_dp_aux *aux = adapter->algo_data;
|
|
struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux);
|
|
struct drm_dp_mst_branch *mstb;
|
|
struct drm_dp_mst_topology_mgr *mgr = port->mgr;
|
|
unsigned int i;
|
|
struct drm_dp_sideband_msg_req_body msg;
|
|
struct drm_dp_sideband_msg_tx *txmsg = NULL;
|
|
int ret;
|
|
|
|
mstb = drm_dp_mst_topology_get_mstb_validated(mgr, port->parent);
|
|
if (!mstb)
|
|
return -EREMOTEIO;
|
|
|
|
if (!remote_i2c_read_ok(msgs, num)) {
|
|
DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n");
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
memset(&msg, 0, sizeof(msg));
|
|
msg.req_type = DP_REMOTE_I2C_READ;
|
|
msg.u.i2c_read.num_transactions = num - 1;
|
|
msg.u.i2c_read.port_number = port->port_num;
|
|
for (i = 0; i < num - 1; i++) {
|
|
msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr;
|
|
msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len;
|
|
msg.u.i2c_read.transactions[i].bytes = msgs[i].buf;
|
|
msg.u.i2c_read.transactions[i].no_stop_bit = !(msgs[i].flags & I2C_M_STOP);
|
|
}
|
|
msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr;
|
|
msg.u.i2c_read.num_bytes_read = msgs[num - 1].len;
|
|
|
|
txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
|
|
if (!txmsg) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
txmsg->dst = mstb;
|
|
drm_dp_encode_sideband_req(&msg, txmsg);
|
|
|
|
drm_dp_queue_down_tx(mgr, txmsg);
|
|
|
|
ret = drm_dp_mst_wait_tx_reply(mstb, txmsg);
|
|
if (ret > 0) {
|
|
|
|
if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {
|
|
ret = -EREMOTEIO;
|
|
goto out;
|
|
}
|
|
if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len);
|
|
ret = num;
|
|
}
|
|
out:
|
|
kfree(txmsg);
|
|
drm_dp_mst_topology_put_mstb(mstb);
|
|
return ret;
|
|
}
|
|
|
|
static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter)
|
|
{
|
|
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
|
|
I2C_FUNC_SMBUS_READ_BLOCK_DATA |
|
|
I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
|
|
I2C_FUNC_10BIT_ADDR;
|
|
}
|
|
|
|
static const struct i2c_algorithm drm_dp_mst_i2c_algo = {
|
|
.functionality = drm_dp_mst_i2c_functionality,
|
|
.master_xfer = drm_dp_mst_i2c_xfer,
|
|
};
|
|
|
|
/**
|
|
* drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX
|
|
* @aux: DisplayPort AUX channel
|
|
*
|
|
* Returns 0 on success or a negative error code on failure.
|
|
*/
|
|
static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux)
|
|
{
|
|
aux->ddc.algo = &drm_dp_mst_i2c_algo;
|
|
aux->ddc.algo_data = aux;
|
|
aux->ddc.retries = 3;
|
|
|
|
aux->ddc.class = I2C_CLASS_DDC;
|
|
aux->ddc.owner = THIS_MODULE;
|
|
aux->ddc.dev.parent = aux->dev;
|
|
aux->ddc.dev.of_node = aux->dev->of_node;
|
|
|
|
strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev),
|
|
sizeof(aux->ddc.name));
|
|
|
|
return i2c_add_adapter(&aux->ddc);
|
|
}
|
|
|
|
/**
|
|
* drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter
|
|
* @aux: DisplayPort AUX channel
|
|
*/
|
|
static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux)
|
|
{
|
|
i2c_del_adapter(&aux->ddc);
|
|
}
|