From: Sean Paul <seanpaul@xxxxxxxxxxxx>
EDID error handling has 2 problems:
- It doesn't fail as early as it can
- The retry counts for i2c and aux transactions are huge
This patch fails if the initial i2c transaction fails, and reduces the
aux and i2c retry counts down to 3.
[jg1.han@xxxxxxxxxxx: reduced the retry count of exynos_dp_read_byte_from_dpcd()]
Signed-off-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
Signed-off-by: Jingoo Han <jg1.han@xxxxxxxxxxx>
---
drivers/video/exynos/exynos_dp_core.c | 13 ++++++++-----
drivers/video/exynos/exynos_dp_reg.c | 14 ++++++--------
2 files changed, 14 insertions(+), 13 deletions(-)
diff --git a/drivers/video/exynos/exynos_dp_core.c b/drivers/video/exynos/exynos_dp_core.c
index 6e54a18..4a6ed2f 100644
--- a/drivers/video/exynos/exynos_dp_core.c
+++ b/drivers/video/exynos/exynos_dp_core.c
@@ -90,9 +90,11 @@ static int exynos_dp_read_edid(struct exynos_dp_device *dp)
*/
/* Read Extension Flag, Number of 128-byte EDID extension blocks */
- exynos_dp_read_byte_from_i2c(dp, I2C_EDID_DEVICE_ADDR,
+ retval = exynos_dp_read_byte_from_i2c(dp, I2C_EDID_DEVICE_ADDR,
EDID_EXTENSION_FLAG,
&extend_block);
+ if (retval)
+ return retval;
if (extend_block > 0) {
dev_dbg(dp->dev, "EDID data includes a single extension!\n");
@@ -181,14 +183,15 @@ static int exynos_dp_handle_edid(struct exynos_dp_device *dp)
int retval;
/* Read DPCD DPCD_ADDR_DPCD_REV~RECEIVE_PORT1_CAP_1 */
- exynos_dp_read_bytes_from_dpcd(dp,
- DPCD_ADDR_DPCD_REV,
- 12, buf);
+ retval = exynos_dp_read_bytes_from_dpcd(dp, DPCD_ADDR_DPCD_REV,
+ 12, buf);
+ if (retval)
+ return retval;
/* Read EDID */
for (i = 0; i < 3; i++) {
retval = exynos_dp_read_edid(dp);
- if (retval == 0)
+ if (!retval)
break;
}
diff --git a/drivers/video/exynos/exynos_dp_reg.c b/drivers/video/exynos/exynos_dp_reg.c
index 3f5ca8a..fc19ef6 100644
--- a/drivers/video/exynos/exynos_dp_reg.c
+++ b/drivers/video/exynos/exynos_dp_reg.c
@@ -491,7 +491,7 @@ int exynos_dp_read_byte_from_dpcd(struct exynos_dp_device *dp,
int i;
int retval;
- for (i = 0; i < 10; i++) {
+ for (i = 0; i < 3; i++) {
/* Clear AUX CH data buffer */
reg = BUF_CLR;
writel(reg, dp->reg_base + EXYNOS_DP_BUFFER_DATA_CTL);
@@ -552,7 +552,7 @@ int exynos_dp_write_bytes_to_dpcd(struct exynos_dp_device *dp,
else
cur_data_count = count - start_offset;
- for (i = 0; i < 10; i++) {
+ for (i = 0; i < 3; i++) {
/* Select DPCD device address */
reg = AUX_ADDR_7_0(reg_addr + start_offset);
writel(reg, dp->reg_base + EXYNOS_DP_AUX_ADDR_7_0);
@@ -617,7 +617,7 @@ int exynos_dp_read_bytes_from_dpcd(struct exynos_dp_device *dp,
cur_data_count = count - start_offset;
/* AUX CH Request Transaction process */
- for (i = 0; i < 10; i++) {
+ for (i = 0; i < 3; i++) {
/* Select DPCD device address */
reg = AUX_ADDR_7_0(reg_addr + start_offset);
writel(reg, dp->reg_base + EXYNOS_DP_AUX_ADDR_7_0);
@@ -700,17 +700,15 @@ int exynos_dp_read_byte_from_i2c(struct exynos_dp_device *dp,
int i;
int retval;
- for (i = 0; i < 10; i++) {
+ for (i = 0; i < 3; i++) {
/* Clear AUX CH data buffer */
reg = BUF_CLR;
writel(reg, dp->reg_base + EXYNOS_DP_BUFFER_DATA_CTL);
/* Select EDID device */
retval = exynos_dp_select_i2c_device(dp, device_addr, reg_addr);
- if (retval != 0) {
- dev_err(dp->dev, "Select EDID device fail!\n");
+ if (retval != 0)
continue;
- }
/*
* Set I2C transaction and read data
@@ -750,7 +748,7 @@ int exynos_dp_read_bytes_from_i2c(struct exynos_dp_device *dp,
int retval = 0;
for (i = 0; i < count; i += 16) {
- for (j = 0; j < 100; j++) {
+ for (j = 0; j < 3; j++) {
/* Clear AUX CH data buffer */
reg = BUF_CLR;
writel(reg, dp->reg_base + EXYNOS_DP_BUFFER_DATA_CTL);
--
1.7.1
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