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drm/amd/display: Increase DPCD read retries

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[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 ad1c59ad7cf74ec06e32fe2c330ac1e957222288)
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
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2
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
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@@ -1691,7 +1691,7 @@ static bool retrieve_link_cap(struct dc_link *link)
union edp_configuration_cap edp_config_cap; union edp_configuration_cap edp_config_cap;
union dp_downstream_port_present ds_port = { 0 }; union dp_downstream_port_present ds_port = { 0 };
enum dc_status status = DC_ERROR_UNEXPECTED; enum dc_status status = DC_ERROR_UNEXPECTED;
uint32_t read_dpcd_retry_cnt = 3; uint32_t read_dpcd_retry_cnt = 20;
int i; int i;
struct dp_sink_hw_fw_revision dp_hw_fw_revision; struct dp_sink_hw_fw_revision dp_hw_fw_revision;
const uint32_t post_oui_delay = 30; // 30ms const uint32_t post_oui_delay = 30; // 30ms