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linux/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2016 Allwinnertech Co., Ltd.
* Copyright (C) 2017-2018 Bootlin
*
* Maxime Ripard <maxime.ripard@bootlin.com>
*/
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/crc-ccitt.h>
#include <linux/of_address.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include <linux/slab.h>
#include <linux/phy/phy.h>
#include <linux/phy/phy-mipi-dphy.h>
#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_panel.h>
#include <drm/drm_probe_helper.h>
#include "sun4i_drv.h"
#include "sun6i_mipi_dsi.h"
#include <video/mipi_display.h>
#define SUN6I_DSI_CTL_REG 0x000
#define SUN6I_DSI_CTL_EN BIT(0)
#define SUN6I_DSI_BASIC_CTL_REG 0x00c
#define SUN6I_DSI_BASIC_CTL_HBP_DIS BIT(2)
#define SUN6I_DSI_BASIC_CTL_HSA_HSE_DIS BIT(1)
#define SUN6I_DSI_BASIC_CTL_VIDEO_BURST BIT(0)
#define SUN6I_DSI_BASIC_CTL0_REG 0x010
#define SUN6I_DSI_BASIC_CTL0_HS_EOTP_EN BIT(18)
#define SUN6I_DSI_BASIC_CTL0_CRC_EN BIT(17)
#define SUN6I_DSI_BASIC_CTL0_ECC_EN BIT(16)
#define SUN6I_DSI_BASIC_CTL0_INST_ST BIT(0)
#define SUN6I_DSI_BASIC_CTL1_REG 0x014
#define SUN6I_DSI_BASIC_CTL1_VIDEO_ST_DELAY(n) (((n) & 0x1fff) << 4)
#define SUN6I_DSI_BASIC_CTL1_VIDEO_FILL BIT(2)
#define SUN6I_DSI_BASIC_CTL1_VIDEO_PRECISION BIT(1)
#define SUN6I_DSI_BASIC_CTL1_VIDEO_MODE BIT(0)
#define SUN6I_DSI_BASIC_SIZE0_REG 0x018
#define SUN6I_DSI_BASIC_SIZE0_VBP(n) (((n) & 0xfff) << 16)
#define SUN6I_DSI_BASIC_SIZE0_VSA(n) ((n) & 0xfff)
#define SUN6I_DSI_BASIC_SIZE1_REG 0x01c
#define SUN6I_DSI_BASIC_SIZE1_VT(n) (((n) & 0xfff) << 16)
#define SUN6I_DSI_BASIC_SIZE1_VACT(n) ((n) & 0xfff)
#define SUN6I_DSI_INST_FUNC_REG(n) (0x020 + (n) * 0x04)
#define SUN6I_DSI_INST_FUNC_INST_MODE(n) (((n) & 0xf) << 28)
#define SUN6I_DSI_INST_FUNC_ESCAPE_ENTRY(n) (((n) & 0xf) << 24)
#define SUN6I_DSI_INST_FUNC_TRANS_PACKET(n) (((n) & 0xf) << 20)
#define SUN6I_DSI_INST_FUNC_LANE_CEN BIT(4)
#define SUN6I_DSI_INST_FUNC_LANE_DEN(n) ((n) & 0xf)
#define SUN6I_DSI_INST_LOOP_SEL_REG 0x040
#define SUN6I_DSI_INST_LOOP_NUM_REG(n) (0x044 + (n) * 0x10)
#define SUN6I_DSI_INST_LOOP_NUM_N1(n) (((n) & 0xfff) << 16)
#define SUN6I_DSI_INST_LOOP_NUM_N0(n) ((n) & 0xfff)
#define SUN6I_DSI_INST_JUMP_SEL_REG 0x048
#define SUN6I_DSI_INST_JUMP_CFG_REG(n) (0x04c + (n) * 0x04)
#define SUN6I_DSI_INST_JUMP_CFG_TO(n) (((n) & 0xf) << 20)
#define SUN6I_DSI_INST_JUMP_CFG_POINT(n) (((n) & 0xf) << 16)
#define SUN6I_DSI_INST_JUMP_CFG_NUM(n) ((n) & 0xffff)
#define SUN6I_DSI_TRANS_START_REG 0x060
#define SUN6I_DSI_TRANS_ZERO_REG 0x078
#define SUN6I_DSI_TCON_DRQ_REG 0x07c
#define SUN6I_DSI_TCON_DRQ_ENABLE_MODE BIT(28)
#define SUN6I_DSI_TCON_DRQ_SET(n) ((n) & 0x3ff)
#define SUN6I_DSI_PIXEL_CTL0_REG 0x080
#define SUN6I_DSI_PIXEL_CTL0_PD_PLUG_DISABLE BIT(16)
#define SUN6I_DSI_PIXEL_CTL0_FORMAT(n) ((n) & 0xf)
#define SUN6I_DSI_PIXEL_CTL1_REG 0x084
#define SUN6I_DSI_PIXEL_PH_REG 0x090
#define SUN6I_DSI_PIXEL_PH_ECC(n) (((n) & 0xff) << 24)
#define SUN6I_DSI_PIXEL_PH_WC(n) (((n) & 0xffff) << 8)
#define SUN6I_DSI_PIXEL_PH_VC(n) (((n) & 3) << 6)
#define SUN6I_DSI_PIXEL_PH_DT(n) ((n) & 0x3f)
#define SUN6I_DSI_PIXEL_PF0_REG 0x098
#define SUN6I_DSI_PIXEL_PF0_CRC_FORCE(n) ((n) & 0xffff)
#define SUN6I_DSI_PIXEL_PF1_REG 0x09c
#define SUN6I_DSI_PIXEL_PF1_CRC_INIT_LINEN(n) (((n) & 0xffff) << 16)
#define SUN6I_DSI_PIXEL_PF1_CRC_INIT_LINE0(n) ((n) & 0xffff)
#define SUN6I_DSI_SYNC_HSS_REG 0x0b0
#define SUN6I_DSI_SYNC_HSE_REG 0x0b4
#define SUN6I_DSI_SYNC_VSS_REG 0x0b8
#define SUN6I_DSI_SYNC_VSE_REG 0x0bc
#define SUN6I_DSI_BLK_HSA0_REG 0x0c0
#define SUN6I_DSI_BLK_HSA1_REG 0x0c4
#define SUN6I_DSI_BLK_PF(n) (((n) & 0xffff) << 16)
#define SUN6I_DSI_BLK_PD(n) ((n) & 0xff)
#define SUN6I_DSI_BLK_HBP0_REG 0x0c8
#define SUN6I_DSI_BLK_HBP1_REG 0x0cc
#define SUN6I_DSI_BLK_HFP0_REG 0x0d0
#define SUN6I_DSI_BLK_HFP1_REG 0x0d4
#define SUN6I_DSI_BLK_HBLK0_REG 0x0e0
#define SUN6I_DSI_BLK_HBLK1_REG 0x0e4
#define SUN6I_DSI_BLK_VBLK0_REG 0x0e8
#define SUN6I_DSI_BLK_VBLK1_REG 0x0ec
#define SUN6I_DSI_BURST_LINE_REG 0x0f0
#define SUN6I_DSI_BURST_LINE_SYNC_POINT(n) (((n) & 0xffff) << 16)
#define SUN6I_DSI_BURST_LINE_NUM(n) ((n) & 0xffff)
#define SUN6I_DSI_BURST_DRQ_REG 0x0f4
#define SUN6I_DSI_BURST_DRQ_EDGE1(n) (((n) & 0xffff) << 16)
#define SUN6I_DSI_BURST_DRQ_EDGE0(n) ((n) & 0xffff)
#define SUN6I_DSI_CMD_CTL_REG 0x200
#define SUN6I_DSI_CMD_CTL_RX_OVERFLOW BIT(26)
#define SUN6I_DSI_CMD_CTL_RX_FLAG BIT(25)
#define SUN6I_DSI_CMD_CTL_TX_FLAG BIT(9)
#define SUN6I_DSI_CMD_RX_REG(n) (0x240 + (n) * 0x04)
#define SUN6I_DSI_DEBUG_DATA_REG 0x2f8
#define SUN6I_DSI_CMD_TX_REG(n) (0x300 + (n) * 0x04)
enum sun6i_dsi_start_inst {
DSI_START_LPRX,
DSI_START_LPTX,
DSI_START_HSC,
DSI_START_HSD,
};
enum sun6i_dsi_inst_id {
DSI_INST_ID_LP11 = 0,
DSI_INST_ID_TBA,
DSI_INST_ID_HSC,
DSI_INST_ID_HSD,
DSI_INST_ID_LPDT,
DSI_INST_ID_HSCEXIT,
DSI_INST_ID_NOP,
DSI_INST_ID_DLY,
DSI_INST_ID_END = 15,
};
enum sun6i_dsi_inst_mode {
DSI_INST_MODE_STOP = 0,
DSI_INST_MODE_TBA,
DSI_INST_MODE_HS,
DSI_INST_MODE_ESCAPE,
DSI_INST_MODE_HSCEXIT,
DSI_INST_MODE_NOP,
};
enum sun6i_dsi_inst_escape {
DSI_INST_ESCA_LPDT = 0,
DSI_INST_ESCA_ULPS,
DSI_INST_ESCA_UN1,
DSI_INST_ESCA_UN2,
DSI_INST_ESCA_RESET,
DSI_INST_ESCA_UN3,
DSI_INST_ESCA_UN4,
DSI_INST_ESCA_UN5,
};
enum sun6i_dsi_inst_packet {
DSI_INST_PACK_PIXEL = 0,
DSI_INST_PACK_COMMAND,
};
static const u32 sun6i_dsi_ecc_array[] = {
[0] = (BIT(0) | BIT(1) | BIT(2) | BIT(4) | BIT(5) | BIT(7) | BIT(10) |
BIT(11) | BIT(13) | BIT(16) | BIT(20) | BIT(21) | BIT(22) |
BIT(23)),
[1] = (BIT(0) | BIT(1) | BIT(3) | BIT(4) | BIT(6) | BIT(8) | BIT(10) |
BIT(12) | BIT(14) | BIT(17) | BIT(20) | BIT(21) | BIT(22) |
BIT(23)),
[2] = (BIT(0) | BIT(2) | BIT(3) | BIT(5) | BIT(6) | BIT(9) | BIT(11) |
BIT(12) | BIT(15) | BIT(18) | BIT(20) | BIT(21) | BIT(22)),
[3] = (BIT(1) | BIT(2) | BIT(3) | BIT(7) | BIT(8) | BIT(9) | BIT(13) |
BIT(14) | BIT(15) | BIT(19) | BIT(20) | BIT(21) | BIT(23)),
[4] = (BIT(4) | BIT(5) | BIT(6) | BIT(7) | BIT(8) | BIT(9) | BIT(16) |
BIT(17) | BIT(18) | BIT(19) | BIT(20) | BIT(22) | BIT(23)),
[5] = (BIT(10) | BIT(11) | BIT(12) | BIT(13) | BIT(14) | BIT(15) |
BIT(16) | BIT(17) | BIT(18) | BIT(19) | BIT(21) | BIT(22) |
BIT(23)),
};
static u32 sun6i_dsi_ecc_compute(unsigned int data)
{
int i;
u8 ecc = 0;
for (i = 0; i < ARRAY_SIZE(sun6i_dsi_ecc_array); i++) {
u32 field = sun6i_dsi_ecc_array[i];
bool init = false;
u8 val = 0;
int j;
for (j = 0; j < 24; j++) {
if (!(BIT(j) & field))
continue;
if (!init) {
val = (BIT(j) & data) ? 1 : 0;
init = true;
} else {
val ^= (BIT(j) & data) ? 1 : 0;
}
}
ecc |= val << i;
}
return ecc;
}
static u16 sun6i_dsi_crc_compute(u8 const *buffer, size_t len)
{
return crc_ccitt(0xffff, buffer, len);
}
static u16 sun6i_dsi_crc_repeat(u8 pd, u8 *buffer, size_t len)
{
memset(buffer, pd, len);
return sun6i_dsi_crc_compute(buffer, len);
}
static u32 sun6i_dsi_build_sync_pkt(u8 dt, u8 vc, u8 d0, u8 d1)
{
u32 val = dt & 0x3f;
val |= (vc & 3) << 6;
val |= (d0 & 0xff) << 8;
val |= (d1 & 0xff) << 16;
val |= sun6i_dsi_ecc_compute(val) << 24;
return val;
}
static u32 sun6i_dsi_build_blk0_pkt(u8 vc, u16 wc)
{
return sun6i_dsi_build_sync_pkt(MIPI_DSI_BLANKING_PACKET, vc,
wc & 0xff, wc >> 8);
}
static u32 sun6i_dsi_build_blk1_pkt(u16 pd, u8 *buffer, size_t len)
{
u32 val = SUN6I_DSI_BLK_PD(pd);
return val | SUN6I_DSI_BLK_PF(sun6i_dsi_crc_repeat(pd, buffer, len));
}
static void sun6i_dsi_inst_abort(struct sun6i_dsi *dsi)
{
regmap_update_bits(dsi->regs, SUN6I_DSI_BASIC_CTL0_REG,
SUN6I_DSI_BASIC_CTL0_INST_ST, 0);
}
static void sun6i_dsi_inst_commit(struct sun6i_dsi *dsi)
{
regmap_update_bits(dsi->regs, SUN6I_DSI_BASIC_CTL0_REG,
SUN6I_DSI_BASIC_CTL0_INST_ST,
SUN6I_DSI_BASIC_CTL0_INST_ST);
}
static int sun6i_dsi_inst_wait_for_completion(struct sun6i_dsi *dsi)
{
u32 val;
return regmap_read_poll_timeout(dsi->regs, SUN6I_DSI_BASIC_CTL0_REG,
val,
!(val & SUN6I_DSI_BASIC_CTL0_INST_ST),
100, 5000);
}
static void sun6i_dsi_inst_setup(struct sun6i_dsi *dsi,
enum sun6i_dsi_inst_id id,
enum sun6i_dsi_inst_mode mode,
bool clock, u8 data,
enum sun6i_dsi_inst_packet packet,
enum sun6i_dsi_inst_escape escape)
{
regmap_write(dsi->regs, SUN6I_DSI_INST_FUNC_REG(id),
SUN6I_DSI_INST_FUNC_INST_MODE(mode) |
SUN6I_DSI_INST_FUNC_ESCAPE_ENTRY(escape) |
SUN6I_DSI_INST_FUNC_TRANS_PACKET(packet) |
(clock ? SUN6I_DSI_INST_FUNC_LANE_CEN : 0) |
SUN6I_DSI_INST_FUNC_LANE_DEN(data));
}
static void sun6i_dsi_inst_init(struct sun6i_dsi *dsi,
struct mipi_dsi_device *device)
{
u8 lanes_mask = GENMASK(device->lanes - 1, 0);
sun6i_dsi_inst_setup(dsi, DSI_INST_ID_LP11, DSI_INST_MODE_STOP,
true, lanes_mask, 0, 0);
sun6i_dsi_inst_setup(dsi, DSI_INST_ID_TBA, DSI_INST_MODE_TBA,
false, 1, 0, 0);
sun6i_dsi_inst_setup(dsi, DSI_INST_ID_HSC, DSI_INST_MODE_HS,
true, 0, DSI_INST_PACK_PIXEL, 0);
sun6i_dsi_inst_setup(dsi, DSI_INST_ID_HSD, DSI_INST_MODE_HS,
false, lanes_mask, DSI_INST_PACK_PIXEL, 0);
sun6i_dsi_inst_setup(dsi, DSI_INST_ID_LPDT, DSI_INST_MODE_ESCAPE,
false, 1, DSI_INST_PACK_COMMAND,
DSI_INST_ESCA_LPDT);
sun6i_dsi_inst_setup(dsi, DSI_INST_ID_HSCEXIT, DSI_INST_MODE_HSCEXIT,
true, 0, 0, 0);
sun6i_dsi_inst_setup(dsi, DSI_INST_ID_NOP, DSI_INST_MODE_STOP,
false, lanes_mask, 0, 0);
sun6i_dsi_inst_setup(dsi, DSI_INST_ID_DLY, DSI_INST_MODE_NOP,
true, lanes_mask, 0, 0);
regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_CFG_REG(0),
SUN6I_DSI_INST_JUMP_CFG_POINT(DSI_INST_ID_NOP) |
SUN6I_DSI_INST_JUMP_CFG_TO(DSI_INST_ID_HSCEXIT) |
SUN6I_DSI_INST_JUMP_CFG_NUM(1));
};
static u16 sun6i_dsi_get_video_start_delay(struct sun6i_dsi *dsi,
struct drm_display_mode *mode)
{
return mode->vtotal - (mode->vsync_end - mode->vdisplay) + 1;
}
static void sun6i_dsi_setup_burst(struct sun6i_dsi *dsi,
struct drm_display_mode *mode)
{
struct mipi_dsi_device *device = dsi->device;
u32 val = 0;
if ((mode->hsync_end - mode->hdisplay) > 20) {
/* Maaaaaagic */
u16 drq = (mode->hsync_end - mode->hdisplay) - 20;
drq *= mipi_dsi_pixel_format_to_bpp(device->format);
drq /= 32;
val = (SUN6I_DSI_TCON_DRQ_ENABLE_MODE |
SUN6I_DSI_TCON_DRQ_SET(drq));
}
regmap_write(dsi->regs, SUN6I_DSI_TCON_DRQ_REG, val);
}
static void sun6i_dsi_setup_inst_loop(struct sun6i_dsi *dsi,
struct drm_display_mode *mode)
{
u16 delay = 50 - 1;
regmap_write(dsi->regs, SUN6I_DSI_INST_LOOP_NUM_REG(0),
SUN6I_DSI_INST_LOOP_NUM_N0(50 - 1) |
SUN6I_DSI_INST_LOOP_NUM_N1(delay));
regmap_write(dsi->regs, SUN6I_DSI_INST_LOOP_NUM_REG(1),
SUN6I_DSI_INST_LOOP_NUM_N0(50 - 1) |
SUN6I_DSI_INST_LOOP_NUM_N1(delay));
}
static void sun6i_dsi_setup_format(struct sun6i_dsi *dsi,
struct drm_display_mode *mode)
{
struct mipi_dsi_device *device = dsi->device;
u32 val = SUN6I_DSI_PIXEL_PH_VC(device->channel);
u8 dt, fmt;
u16 wc;
/*
* TODO: The format defines are only valid in video mode and
* change in command mode.
*/
switch (device->format) {
case MIPI_DSI_FMT_RGB888:
dt = MIPI_DSI_PACKED_PIXEL_STREAM_24;
fmt = 8;
break;
case MIPI_DSI_FMT_RGB666:
dt = MIPI_DSI_PIXEL_STREAM_3BYTE_18;
fmt = 9;
break;
case MIPI_DSI_FMT_RGB666_PACKED:
dt = MIPI_DSI_PACKED_PIXEL_STREAM_18;
fmt = 10;
break;
case MIPI_DSI_FMT_RGB565:
dt = MIPI_DSI_PACKED_PIXEL_STREAM_16;
fmt = 11;
break;
default:
return;
}
val |= SUN6I_DSI_PIXEL_PH_DT(dt);
wc = mode->hdisplay * mipi_dsi_pixel_format_to_bpp(device->format) / 8;
val |= SUN6I_DSI_PIXEL_PH_WC(wc);
val |= SUN6I_DSI_PIXEL_PH_ECC(sun6i_dsi_ecc_compute(val));
regmap_write(dsi->regs, SUN6I_DSI_PIXEL_PH_REG, val);
regmap_write(dsi->regs, SUN6I_DSI_PIXEL_PF0_REG,
SUN6I_DSI_PIXEL_PF0_CRC_FORCE(0xffff));
regmap_write(dsi->regs, SUN6I_DSI_PIXEL_PF1_REG,
SUN6I_DSI_PIXEL_PF1_CRC_INIT_LINE0(0xffff) |
SUN6I_DSI_PIXEL_PF1_CRC_INIT_LINEN(0xffff));
regmap_write(dsi->regs, SUN6I_DSI_PIXEL_CTL0_REG,
SUN6I_DSI_PIXEL_CTL0_PD_PLUG_DISABLE |
SUN6I_DSI_PIXEL_CTL0_FORMAT(fmt));
}
static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
struct drm_display_mode *mode)
{
struct mipi_dsi_device *device = dsi->device;
unsigned int Bpp = mipi_dsi_pixel_format_to_bpp(device->format) / 8;
u16 hbp, hfp, hsa, hblk, vblk;
size_t bytes;
u8 *buffer;
/* Do all timing calculations up front to allocate buffer space */
/*
* A sync period is composed of a blanking packet (4 bytes +
* payload + 2 bytes) and a sync event packet (4 bytes). Its
* minimal size is therefore 10 bytes
*/
#define HSA_PACKET_OVERHEAD 10
hsa = max((unsigned int)HSA_PACKET_OVERHEAD,
(mode->hsync_end - mode->hsync_start) * Bpp - HSA_PACKET_OVERHEAD);
/*
* The backporch is set using a blanking packet (4 bytes +
* payload + 2 bytes). Its minimal size is therefore 6 bytes
*/
#define HBP_PACKET_OVERHEAD 6
hbp = max((unsigned int)HBP_PACKET_OVERHEAD,
(mode->hsync_start - mode->hdisplay) * Bpp - HBP_PACKET_OVERHEAD);
/*
* The frontporch is set using a blanking packet (4 bytes +
* payload + 2 bytes). Its minimal size is therefore 6 bytes
*/
#define HFP_PACKET_OVERHEAD 6
hfp = max((unsigned int)HFP_PACKET_OVERHEAD,
(mode->htotal - mode->hsync_end) * Bpp - HFP_PACKET_OVERHEAD);
/*
* hblk seems to be the line + porches length.
*/
hblk = mode->htotal * Bpp - hsa;
/*
* And I'm not entirely sure what vblk is about. The driver in
* Allwinner BSP is using a rather convoluted calculation
* there only for 4 lanes. However, using 0 (the !4 lanes
* case) even with a 4 lanes screen seems to work...
*/
vblk = 0;
/* How many bytes do we need to send all payloads? */
bytes = max_t(size_t, max(max(hfp, hblk), max(hsa, hbp)), vblk);
buffer = kmalloc(bytes, GFP_KERNEL);
if (WARN_ON(!buffer))
return;
regmap_write(dsi->regs, SUN6I_DSI_BASIC_CTL_REG, 0);
regmap_write(dsi->regs, SUN6I_DSI_SYNC_HSS_REG,
sun6i_dsi_build_sync_pkt(MIPI_DSI_H_SYNC_START,
device->channel,
0, 0));
regmap_write(dsi->regs, SUN6I_DSI_SYNC_HSE_REG,
sun6i_dsi_build_sync_pkt(MIPI_DSI_H_SYNC_END,
device->channel,
0, 0));
regmap_write(dsi->regs, SUN6I_DSI_SYNC_VSS_REG,
sun6i_dsi_build_sync_pkt(MIPI_DSI_V_SYNC_START,
device->channel,
0, 0));
regmap_write(dsi->regs, SUN6I_DSI_SYNC_VSE_REG,
sun6i_dsi_build_sync_pkt(MIPI_DSI_V_SYNC_END,
device->channel,
0, 0));
regmap_write(dsi->regs, SUN6I_DSI_BASIC_SIZE0_REG,
SUN6I_DSI_BASIC_SIZE0_VSA(mode->vsync_end -
mode->vsync_start) |
SUN6I_DSI_BASIC_SIZE0_VBP(mode->vsync_start -
mode->vdisplay));
regmap_write(dsi->regs, SUN6I_DSI_BASIC_SIZE1_REG,
SUN6I_DSI_BASIC_SIZE1_VACT(mode->vdisplay) |
SUN6I_DSI_BASIC_SIZE1_VT(mode->vtotal));
/* sync */
regmap_write(dsi->regs, SUN6I_DSI_BLK_HSA0_REG,
sun6i_dsi_build_blk0_pkt(device->channel, hsa));
regmap_write(dsi->regs, SUN6I_DSI_BLK_HSA1_REG,
sun6i_dsi_build_blk1_pkt(0, buffer, hsa));
/* backporch */
regmap_write(dsi->regs, SUN6I_DSI_BLK_HBP0_REG,
sun6i_dsi_build_blk0_pkt(device->channel, hbp));
regmap_write(dsi->regs, SUN6I_DSI_BLK_HBP1_REG,
sun6i_dsi_build_blk1_pkt(0, buffer, hbp));
/* frontporch */
regmap_write(dsi->regs, SUN6I_DSI_BLK_HFP0_REG,
sun6i_dsi_build_blk0_pkt(device->channel, hfp));
regmap_write(dsi->regs, SUN6I_DSI_BLK_HFP1_REG,
sun6i_dsi_build_blk1_pkt(0, buffer, hfp));
/* hblk */
regmap_write(dsi->regs, SUN6I_DSI_BLK_HBLK0_REG,
sun6i_dsi_build_blk0_pkt(device->channel, hblk));
regmap_write(dsi->regs, SUN6I_DSI_BLK_HBLK1_REG,
sun6i_dsi_build_blk1_pkt(0, buffer, hblk));
/* vblk */
regmap_write(dsi->regs, SUN6I_DSI_BLK_VBLK0_REG,
sun6i_dsi_build_blk0_pkt(device->channel, vblk));
regmap_write(dsi->regs, SUN6I_DSI_BLK_VBLK1_REG,
sun6i_dsi_build_blk1_pkt(0, buffer, vblk));
kfree(buffer);
}
static int sun6i_dsi_start(struct sun6i_dsi *dsi,
enum sun6i_dsi_start_inst func)
{
switch (func) {
case DSI_START_LPTX:
regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_SEL_REG,
DSI_INST_ID_LPDT << (4 * DSI_INST_ID_LP11) |
DSI_INST_ID_END << (4 * DSI_INST_ID_LPDT));
break;
case DSI_START_LPRX:
regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_SEL_REG,
DSI_INST_ID_LPDT << (4 * DSI_INST_ID_LP11) |
DSI_INST_ID_DLY << (4 * DSI_INST_ID_LPDT) |
DSI_INST_ID_TBA << (4 * DSI_INST_ID_DLY) |
DSI_INST_ID_END << (4 * DSI_INST_ID_TBA));
break;
case DSI_START_HSC:
regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_SEL_REG,
DSI_INST_ID_HSC << (4 * DSI_INST_ID_LP11) |
DSI_INST_ID_END << (4 * DSI_INST_ID_HSC));
break;
case DSI_START_HSD:
regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_SEL_REG,
DSI_INST_ID_NOP << (4 * DSI_INST_ID_LP11) |
DSI_INST_ID_HSD << (4 * DSI_INST_ID_NOP) |
DSI_INST_ID_DLY << (4 * DSI_INST_ID_HSD) |
DSI_INST_ID_NOP << (4 * DSI_INST_ID_DLY) |
DSI_INST_ID_END << (4 * DSI_INST_ID_HSCEXIT));
break;
default:
regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_SEL_REG,
DSI_INST_ID_END << (4 * DSI_INST_ID_LP11));
break;
}
sun6i_dsi_inst_abort(dsi);
sun6i_dsi_inst_commit(dsi);
if (func == DSI_START_HSC)
regmap_write_bits(dsi->regs,
SUN6I_DSI_INST_FUNC_REG(DSI_INST_ID_LP11),
SUN6I_DSI_INST_FUNC_LANE_CEN, 0);
return 0;
}
static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder)
{
struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
struct mipi_dsi_device *device = dsi->device;
union phy_configure_opts opts = { 0 };
struct phy_configure_opts_mipi_dphy *cfg = &opts.mipi_dphy;
u16 delay;
DRM_DEBUG_DRIVER("Enabling DSI output\n");
pm_runtime_get_sync(dsi->dev);
delay = sun6i_dsi_get_video_start_delay(dsi, mode);
regmap_write(dsi->regs, SUN6I_DSI_BASIC_CTL1_REG,
SUN6I_DSI_BASIC_CTL1_VIDEO_ST_DELAY(delay) |
SUN6I_DSI_BASIC_CTL1_VIDEO_FILL |
SUN6I_DSI_BASIC_CTL1_VIDEO_PRECISION |
SUN6I_DSI_BASIC_CTL1_VIDEO_MODE);
sun6i_dsi_setup_burst(dsi, mode);
sun6i_dsi_setup_inst_loop(dsi, mode);
sun6i_dsi_setup_format(dsi, mode);
sun6i_dsi_setup_timings(dsi, mode);
phy_init(dsi->dphy);
phy_mipi_dphy_get_default_config(mode->clock * 1000,
mipi_dsi_pixel_format_to_bpp(device->format),
device->lanes, cfg);
phy_set_mode(dsi->dphy, PHY_MODE_MIPI_DPHY);
phy_configure(dsi->dphy, &opts);
phy_power_on(dsi->dphy);
if (!IS_ERR(dsi->panel))
drm_panel_prepare(dsi->panel);
/*
* FIXME: This should be moved after the switch to HS mode.
*
* Unfortunately, once in HS mode, it seems like we're not
* able to send DCS commands anymore, which would prevent any
* panel to send any DCS command as part as their enable
* method, which is quite common.
*
* I haven't seen any artifact due to that sub-optimal
* ordering on the panels I've tested it with, so I guess this
* will do for now, until that IP is better understood.
*/
if (!IS_ERR(dsi->panel))
drm_panel_enable(dsi->panel);
sun6i_dsi_start(dsi, DSI_START_HSC);
udelay(1000);
sun6i_dsi_start(dsi, DSI_START_HSD);
}
static void sun6i_dsi_encoder_disable(struct drm_encoder *encoder)
{
struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
DRM_DEBUG_DRIVER("Disabling DSI output\n");
if (!IS_ERR(dsi->panel)) {
drm_panel_disable(dsi->panel);
drm_panel_unprepare(dsi->panel);
}
phy_power_off(dsi->dphy);
phy_exit(dsi->dphy);
pm_runtime_put(dsi->dev);
}
static int sun6i_dsi_get_modes(struct drm_connector *connector)
{
struct sun6i_dsi *dsi = connector_to_sun6i_dsi(connector);
return drm_panel_get_modes(dsi->panel);
}
static struct drm_connector_helper_funcs sun6i_dsi_connector_helper_funcs = {
.get_modes = sun6i_dsi_get_modes,
};
static enum drm_connector_status
sun6i_dsi_connector_detect(struct drm_connector *connector, bool force)
{
return connector_status_connected;
}
static const struct drm_connector_funcs sun6i_dsi_connector_funcs = {
.detect = sun6i_dsi_connector_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = drm_connector_cleanup,
.reset = drm_atomic_helper_connector_reset,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};
static const struct drm_encoder_helper_funcs sun6i_dsi_enc_helper_funcs = {
.disable = sun6i_dsi_encoder_disable,
.enable = sun6i_dsi_encoder_enable,
};
static const struct drm_encoder_funcs sun6i_dsi_enc_funcs = {
.destroy = drm_encoder_cleanup,
};
static u32 sun6i_dsi_dcs_build_pkt_hdr(struct sun6i_dsi *dsi,
const struct mipi_dsi_msg *msg)
{
u32 pkt = msg->type;
if (msg->type == MIPI_DSI_DCS_LONG_WRITE) {
pkt |= ((msg->tx_len + 1) & 0xffff) << 8;
pkt |= (((msg->tx_len + 1) >> 8) & 0xffff) << 16;
} else {
pkt |= (((u8 *)msg->tx_buf)[0] << 8);
if (msg->tx_len > 1)
pkt |= (((u8 *)msg->tx_buf)[1] << 16);
}
pkt |= sun6i_dsi_ecc_compute(pkt) << 24;
return pkt;
}
static int sun6i_dsi_dcs_write_short(struct sun6i_dsi *dsi,
const struct mipi_dsi_msg *msg)
{
regmap_write(dsi->regs, SUN6I_DSI_CMD_TX_REG(0),
sun6i_dsi_dcs_build_pkt_hdr(dsi, msg));
regmap_write_bits(dsi->regs, SUN6I_DSI_CMD_CTL_REG,
0xff, (4 - 1));
sun6i_dsi_start(dsi, DSI_START_LPTX);
return msg->tx_len;
}
static int sun6i_dsi_dcs_write_long(struct sun6i_dsi *dsi,
const struct mipi_dsi_msg *msg)
{
int ret, len = 0;
u8 *bounce;
u16 crc;
regmap_write(dsi->regs, SUN6I_DSI_CMD_TX_REG(0),
sun6i_dsi_dcs_build_pkt_hdr(dsi, msg));
bounce = kzalloc(msg->tx_len + sizeof(crc), GFP_KERNEL);
if (!bounce)
return -ENOMEM;
memcpy(bounce, msg->tx_buf, msg->tx_len);
len += msg->tx_len;
crc = sun6i_dsi_crc_compute(bounce, msg->tx_len);
memcpy((u8 *)bounce + msg->tx_len, &crc, sizeof(crc));
len += sizeof(crc);
regmap_bulk_write(dsi->regs, SUN6I_DSI_CMD_TX_REG(1), bounce, len);
regmap_write(dsi->regs, SUN6I_DSI_CMD_CTL_REG, len + 4 - 1);
kfree(bounce);
sun6i_dsi_start(dsi, DSI_START_LPTX);
ret = sun6i_dsi_inst_wait_for_completion(dsi);
if (ret < 0) {
sun6i_dsi_inst_abort(dsi);
return ret;
}
/*
* TODO: There's some bits (reg 0x200, bits 8/9) that
* apparently can be used to check whether the data have been
* sent, but I couldn't get it to work reliably.
*/
return msg->tx_len;
}
static int sun6i_dsi_dcs_read(struct sun6i_dsi *dsi,
const struct mipi_dsi_msg *msg)
{
u32 val;
int ret;
u8 byte0;
regmap_write(dsi->regs, SUN6I_DSI_CMD_TX_REG(0),
sun6i_dsi_dcs_build_pkt_hdr(dsi, msg));
regmap_write(dsi->regs, SUN6I_DSI_CMD_CTL_REG,
(4 - 1));
sun6i_dsi_start(dsi, DSI_START_LPRX);
ret = sun6i_dsi_inst_wait_for_completion(dsi);
if (ret < 0) {
sun6i_dsi_inst_abort(dsi);
return ret;
}
/*
* TODO: There's some bits (reg 0x200, bits 24/25) that
* apparently can be used to check whether the data have been
* received, but I couldn't get it to work reliably.
*/
regmap_read(dsi->regs, SUN6I_DSI_CMD_CTL_REG, &val);
if (val & SUN6I_DSI_CMD_CTL_RX_OVERFLOW)
return -EIO;
regmap_read(dsi->regs, SUN6I_DSI_CMD_RX_REG(0), &val);
byte0 = val & 0xff;
if (byte0 == MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT)
return -EIO;
((u8 *)msg->rx_buf)[0] = (val >> 8);
return 1;
}
static int sun6i_dsi_attach(struct mipi_dsi_host *host,
struct mipi_dsi_device *device)
{
struct sun6i_dsi *dsi = host_to_sun6i_dsi(host);
dsi->device = device;
dsi->panel = of_drm_find_panel(device->dev.of_node);
if (IS_ERR(dsi->panel))
return PTR_ERR(dsi->panel);
dev_info(host->dev, "Attached device %s\n", device->name);
return 0;
}
static int sun6i_dsi_detach(struct mipi_dsi_host *host,
struct mipi_dsi_device *device)
{
struct sun6i_dsi *dsi = host_to_sun6i_dsi(host);
dsi->panel = NULL;
dsi->device = NULL;
return 0;
}
static ssize_t sun6i_dsi_transfer(struct mipi_dsi_host *host,
const struct mipi_dsi_msg *msg)
{
struct sun6i_dsi *dsi = host_to_sun6i_dsi(host);
int ret;
ret = sun6i_dsi_inst_wait_for_completion(dsi);
if (ret < 0)
sun6i_dsi_inst_abort(dsi);
regmap_write(dsi->regs, SUN6I_DSI_CMD_CTL_REG,
SUN6I_DSI_CMD_CTL_RX_OVERFLOW |
SUN6I_DSI_CMD_CTL_RX_FLAG |
SUN6I_DSI_CMD_CTL_TX_FLAG);
switch (msg->type) {
case MIPI_DSI_DCS_SHORT_WRITE:
case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
ret = sun6i_dsi_dcs_write_short(dsi, msg);
break;
case MIPI_DSI_DCS_LONG_WRITE:
ret = sun6i_dsi_dcs_write_long(dsi, msg);
break;
case MIPI_DSI_DCS_READ:
if (msg->rx_len == 1) {
ret = sun6i_dsi_dcs_read(dsi, msg);
break;
}
default:
ret = -EINVAL;
}
return ret;
}
static const struct mipi_dsi_host_ops sun6i_dsi_host_ops = {
.attach = sun6i_dsi_attach,
.detach = sun6i_dsi_detach,
.transfer = sun6i_dsi_transfer,
};
static const struct regmap_config sun6i_dsi_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.max_register = SUN6I_DSI_CMD_TX_REG(255),
.name = "mipi-dsi",
};
static int sun6i_dsi_bind(struct device *dev, struct device *master,
void *data)
{
struct drm_device *drm = data;
struct sun4i_drv *drv = drm->dev_private;
struct sun6i_dsi *dsi = dev_get_drvdata(dev);
int ret;
if (!dsi->panel)
return -EPROBE_DEFER;
dsi->drv = drv;
drm_encoder_helper_add(&dsi->encoder,
&sun6i_dsi_enc_helper_funcs);
ret = drm_encoder_init(drm,
&dsi->encoder,
&sun6i_dsi_enc_funcs,
DRM_MODE_ENCODER_DSI,
NULL);
if (ret) {
dev_err(dsi->dev, "Couldn't initialise the DSI encoder\n");
return ret;
}
dsi->encoder.possible_crtcs = BIT(0);
drm_connector_helper_add(&dsi->connector,
&sun6i_dsi_connector_helper_funcs);
ret = drm_connector_init(drm, &dsi->connector,
&sun6i_dsi_connector_funcs,
DRM_MODE_CONNECTOR_DSI);
if (ret) {
dev_err(dsi->dev,
"Couldn't initialise the DSI connector\n");
goto err_cleanup_connector;
}
drm_connector_attach_encoder(&dsi->connector, &dsi->encoder);
drm_panel_attach(dsi->panel, &dsi->connector);
return 0;
err_cleanup_connector:
drm_encoder_cleanup(&dsi->encoder);
return ret;
}
static void sun6i_dsi_unbind(struct device *dev, struct device *master,
void *data)
{
struct sun6i_dsi *dsi = dev_get_drvdata(dev);
drm_panel_detach(dsi->panel);
}
static const struct component_ops sun6i_dsi_ops = {
.bind = sun6i_dsi_bind,
.unbind = sun6i_dsi_unbind,
};
static int sun6i_dsi_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct sun6i_dsi *dsi;
struct resource *res;
void __iomem *base;
int ret;
dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
if (!dsi)
return -ENOMEM;
dev_set_drvdata(dev, dsi);
dsi->dev = dev;
dsi->host.ops = &sun6i_dsi_host_ops;
dsi->host.dev = dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(dev, res);
if (IS_ERR(base)) {
dev_err(dev, "Couldn't map the DSI encoder registers\n");
return PTR_ERR(base);
}
dsi->regs = devm_regmap_init_mmio_clk(dev, "bus", base,
&sun6i_dsi_regmap_config);
if (IS_ERR(dsi->regs)) {
dev_err(dev, "Couldn't create the DSI encoder regmap\n");
return PTR_ERR(dsi->regs);
}
dsi->reset = devm_reset_control_get_shared(dev, NULL);
if (IS_ERR(dsi->reset)) {
dev_err(dev, "Couldn't get our reset line\n");
return PTR_ERR(dsi->reset);
}
dsi->mod_clk = devm_clk_get(dev, "mod");
if (IS_ERR(dsi->mod_clk)) {
dev_err(dev, "Couldn't get the DSI mod clock\n");
return PTR_ERR(dsi->mod_clk);
}
/*
* In order to operate properly, that clock seems to be always
* set to 297MHz.
*/
clk_set_rate_exclusive(dsi->mod_clk, 297000000);
dsi->dphy = devm_phy_get(dev, "dphy");
if (IS_ERR(dsi->dphy)) {
dev_err(dev, "Couldn't get the MIPI D-PHY\n");
ret = PTR_ERR(dsi->dphy);
goto err_unprotect_clk;
}
pm_runtime_enable(dev);
ret = mipi_dsi_host_register(&dsi->host);
if (ret) {
dev_err(dev, "Couldn't register MIPI-DSI host\n");
goto err_pm_disable;
}
ret = component_add(&pdev->dev, &sun6i_dsi_ops);
if (ret) {
dev_err(dev, "Couldn't register our component\n");
goto err_remove_dsi_host;
}
return 0;
err_remove_dsi_host:
mipi_dsi_host_unregister(&dsi->host);
err_pm_disable:
pm_runtime_disable(dev);
err_unprotect_clk:
clk_rate_exclusive_put(dsi->mod_clk);
return ret;
}
static int sun6i_dsi_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct sun6i_dsi *dsi = dev_get_drvdata(dev);
component_del(&pdev->dev, &sun6i_dsi_ops);
mipi_dsi_host_unregister(&dsi->host);
pm_runtime_disable(dev);
clk_rate_exclusive_put(dsi->mod_clk);
return 0;
}
static int __maybe_unused sun6i_dsi_runtime_resume(struct device *dev)
{
struct sun6i_dsi *dsi = dev_get_drvdata(dev);
reset_control_deassert(dsi->reset);
clk_prepare_enable(dsi->mod_clk);
/*
* Enable the DSI block.
*
* Some part of it can only be done once we get a number of
* lanes, see sun6i_dsi_inst_init
*/
regmap_write(dsi->regs, SUN6I_DSI_CTL_REG, SUN6I_DSI_CTL_EN);
regmap_write(dsi->regs, SUN6I_DSI_BASIC_CTL0_REG,
SUN6I_DSI_BASIC_CTL0_ECC_EN | SUN6I_DSI_BASIC_CTL0_CRC_EN);
regmap_write(dsi->regs, SUN6I_DSI_TRANS_START_REG, 10);
regmap_write(dsi->regs, SUN6I_DSI_TRANS_ZERO_REG, 0);
if (dsi->device)
sun6i_dsi_inst_init(dsi, dsi->device);
regmap_write(dsi->regs, SUN6I_DSI_DEBUG_DATA_REG, 0xff);
return 0;
}
static int __maybe_unused sun6i_dsi_runtime_suspend(struct device *dev)
{
struct sun6i_dsi *dsi = dev_get_drvdata(dev);
clk_disable_unprepare(dsi->mod_clk);
reset_control_assert(dsi->reset);
return 0;
}
static const struct dev_pm_ops sun6i_dsi_pm_ops = {
SET_RUNTIME_PM_OPS(sun6i_dsi_runtime_suspend,
sun6i_dsi_runtime_resume,
NULL)
};
static const struct of_device_id sun6i_dsi_of_table[] = {
{ .compatible = "allwinner,sun6i-a31-mipi-dsi" },
{ }
};
MODULE_DEVICE_TABLE(of, sun6i_dsi_of_table);
static struct platform_driver sun6i_dsi_platform_driver = {
.probe = sun6i_dsi_probe,
.remove = sun6i_dsi_remove,
.driver = {
.name = "sun6i-mipi-dsi",
.of_match_table = sun6i_dsi_of_table,
.pm = &sun6i_dsi_pm_ops,
},
};
module_platform_driver(sun6i_dsi_platform_driver);
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
MODULE_DESCRIPTION("Allwinner A31 DSI Driver");
MODULE_LICENSE("GPL");
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