mirrors/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-12-28 10:15:32 -05:00
Code Issues Packages Projects Releases Wiki Activity

drm/amd/display: Increase DPCD read retries

Browse Source 
[Why]
Empirical measurement of some monitors that fail to read EDID while
booting shows that the number of retries with a 30ms delay between
tries is as high as 16.

[How]
Increase number of retries to 20.

Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4672
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>
Signed-off-by: Ivan Lipski <ivan.lipski@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit ad1c59ad7c)
Cc: stable@vger.kernel.org
This commit is contained in:
Mario Limonciello (AMD)
2025-11-03 12:11:31 -06:00
committed by Alex Deucher
parent 71ad9054c1
commit 8612badc33
1 changed files with 1 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
View File

@@ -1691,7 +1691,7 @@ static bool retrieve_link_cap(struct dc_link *link)
union edp_configuration_cap edp_config_cap;
union dp_downstream_port_present ds_port = { 0 };
enum dc_status status = DC_ERROR_UNEXPECTED;
uint32_t read_dpcd_retry_cnt = 3;
uint32_t read_dpcd_retry_cnt = 20;
int i;
struct dp_sink_hw_fw_revision dp_hw_fw_revision;
const uint32_t post_oui_delay = 30; // 30ms