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drm/i915/gmbus: Enable burst read 

Support for Burst read in HW is added for HDCP2.2 compliance
requirement.

This patch enables the burst read for all the gmbus read of more than
511Bytes, on capable platforms.

v2:
  Extra line is removed.
v3:
  Macro is added for detecting the BURST_READ Support [Jani]
  Runtime detection of the need for burst_read [Jani]
  Calculation enhancement.
v4:
  GMBUS0 reg val is passed from caller [ville]
  Removed a extra var [ville]
  Extra brackets are removed [ville]
  Implemented the handling of 512Bytes Burst Read.
v5:
  Burst read max length is fixed at 767Bytes [Ville]
v6:
  Collecting the received reviewed-by.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1530192889-5789-3-git-send-email-ramalingam.c@intel.com
This commit is contained in:
Ramalingam C 2018-06-28 19:04:49 +05:30 committed by Daniel Vetter
parent 73675cf697
commit d5dc0f43f2
3 changed files with 55 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/i915/i915_drv.h
View File

@ -2560,6 +2560,9 @@ intel_info(const struct drm_i915_private *dev_priv)
IS_SKL_GT3(dev_priv) || IS_SKL_GT4(dev_priv))
#define HAS_GMBUS_IRQ(dev_priv) (INTEL_GEN(dev_priv) >= 4)
#define HAS_GMBUS_BURST_READ(dev_priv) (INTEL_GEN(dev_priv) >= 10 || \
IS_GEMINILAKE(dev_priv) || \
IS_KABYLAKE(dev_priv))
/* With the 945 and later, Y tiling got adjusted so that it was 32 128-byte
* rows, which changed the alignment requirements and fence programming.

1
drivers/gpu/drm/i915/i915_reg.h
View File

@ -3123,6 +3123,7 @@ enum i915_power_well_id {
#define GMBUS_RATE_400KHZ (2 << 8) /* reserved on Pineview */
#define GMBUS_RATE_1MHZ (3 << 8) /* reserved on Pineview */
#define GMBUS_HOLD_EXT (1 << 7) /* 300ns hold time, rsvd on Pineview */
#define GMBUS_BYTE_CNT_OVERRIDE (1 << 6)
#define GMBUS_PIN_DISABLED 0
#define GMBUS_PIN_SSC 1
#define GMBUS_PIN_VGADDC 2

61
drivers/gpu/drm/i915/intel_i2c.c
View File

@ -371,12 +371,29 @@ unsigned int gmbus_max_xfer_size(struct drm_i915_private *dev_priv)
static int
gmbus_xfer_read_chunk(struct drm_i915_private *dev_priv,
unsigned short addr, u8 *buf, unsigned int len,
u32 gmbus1_index)
u32 gmbus0_reg, u32 gmbus1_index)
{
unsigned int size = len;
bool burst_read = len > gmbus_max_xfer_size(dev_priv);
bool extra_byte_added = false;
if (burst_read) {
/*
* As per HW Spec, for 512Bytes need to read extra Byte and
* Ignore the extra byte read.
*/
if (len == 512) {
extra_byte_added = true;
len++;
}
size = len % 256 + 256;
I915_WRITE_FW(GMBUS0, gmbus0_reg | GMBUS_BYTE_CNT_OVERRIDE);
}
I915_WRITE_FW(GMBUS1,
gmbus1_index |
GMBUS_CYCLE_WAIT |
(len << GMBUS_BYTE_COUNT_SHIFT) |
(size << GMBUS_BYTE_COUNT_SHIFT) |
(addr << GMBUS_SLAVE_ADDR_SHIFT) |
GMBUS_SLAVE_READ | GMBUS_SW_RDY);
while (len) {
@ -389,17 +406,34 @@ gmbus_xfer_read_chunk(struct drm_i915_private *dev_priv,
val = I915_READ_FW(GMBUS3);
do {
if (extra_byte_added && len == 1)
break;
*buf++ = val & 0xff;
val >>= 8;
} while (--len && ++loop < 4);
if (burst_read && len == size - 4)
/* Reset the override bit */
I915_WRITE_FW(GMBUS0, gmbus0_reg);
}
return 0;
}
/*
* HW spec says that 512Bytes in Burst read need special treatment.
* But it doesn't talk about other multiple of 256Bytes. And couldn't locate
* an I2C slave, which supports such a lengthy burst read too for experiments.
*
* So until things get clarified on HW support, to avoid the burst read length
* in fold of 256Bytes except 512, max burst read length is fixed at 767Bytes.
*/
#define INTEL_GMBUS_BURST_READ_MAX_LEN 767U
static int
gmbus_xfer_read(struct drm_i915_private *dev_priv, struct i2c_msg *msg,
u32 gmbus1_index)
u32 gmbus0_reg, u32 gmbus1_index)
{
u8 *buf = msg->buf;
unsigned int rx_size = msg->len;
@ -407,10 +441,13 @@ gmbus_xfer_read(struct drm_i915_private *dev_priv, struct i2c_msg *msg,
int ret;
do {
len = min(rx_size, gmbus_max_xfer_size(dev_priv));
if (HAS_GMBUS_BURST_READ(dev_priv))
len = min(rx_size, INTEL_GMBUS_BURST_READ_MAX_LEN);
else
len = min(rx_size, gmbus_max_xfer_size(dev_priv));
ret = gmbus_xfer_read_chunk(dev_priv, msg->addr,
buf, len, gmbus1_index);
ret = gmbus_xfer_read_chunk(dev_priv, msg->addr, buf, len,
gmbus0_reg, gmbus1_index);
if (ret)
return ret;
@ -498,7 +535,8 @@ gmbus_is_index_xfer(struct i2c_msg *msgs, int i, int num)
}
static int
gmbus_index_xfer(struct drm_i915_private *dev_priv, struct i2c_msg *msgs)
gmbus_index_xfer(struct drm_i915_private *dev_priv, struct i2c_msg *msgs,
u32 gmbus0_reg)
{
u32 gmbus1_index = 0;
u32 gmbus5 = 0;
@ -516,7 +554,8 @@ gmbus_index_xfer(struct drm_i915_private *dev_priv, struct i2c_msg *msgs)
I915_WRITE_FW(GMBUS5, gmbus5);
if (msgs[1].flags & I2C_M_RD)
ret = gmbus_xfer_read(dev_priv, &msgs[1], gmbus1_index);
ret = gmbus_xfer_read(dev_priv, &msgs[1], gmbus0_reg,
gmbus1_index);
else
ret = gmbus_xfer_write(dev_priv, &msgs[1], gmbus1_index);
@ -551,10 +590,12 @@ do_gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num,
for (; i < num; i += inc) {
inc = 1;
if (gmbus_is_index_xfer(msgs, i, num)) {
ret = gmbus_index_xfer(dev_priv, &msgs[i]);
ret = gmbus_index_xfer(dev_priv, &msgs[i],
gmbus0_source | bus->reg0);
inc = 2; /* an index transmission is two msgs */
} else if (msgs[i].flags & I2C_M_RD) {
ret = gmbus_xfer_read(dev_priv, &msgs[i], 0);
ret = gmbus_xfer_read(dev_priv, &msgs[i],
gmbus0_source | bus->reg0, 0);
} else {
ret = gmbus_xfer_write(dev_priv, &msgs[i], 0);
}