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| author | Mario Limonciello (AMD) <superm1@kernel.org> | 2025-11-03 12:11:31 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-12-01 11:45:48 +0100 |
| commit | 5266f825a631b244cac0b97d8ec93fd6483a7b30 (patch) | |
| tree | 626eb8b732d7709655fc7cd524c7e30d5182914b /drivers/gpu/drm/amd | |
| parent | 9c03896ec657d3eb2af82f567a57054f735e4ccc (diff) | |
| download | linux-5266f825a631b244cac0b97d8ec93fd6483a7b30.tar.gz linux-5266f825a631b244cac0b97d8ec93fd6483a7b30.tar.bz2 linux-5266f825a631b244cac0b97d8ec93fd6483a7b30.zip | |
drm/amd/display: Increase DPCD read retries
commit 8612badc331bcab2068baefa69e1458085ed89e3 upstream.
[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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/gpu/drm/amd')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c index 651926e547b9..d1ff89655711 100644 --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c @@ -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 |