This is a note to let you know that I've just added the patch titled
drm/amd/display: FEC check in timing validation
to the 5.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-amd-display-fec-check-in-timing-validation.patch
and it can be found in the queue-5.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit adf665517978a68afe8ece348c1c3ea590c7c874
Author: Chiawen Huang <chiawen.huang@xxxxxxx>
Date: Thu Mar 10 00:07:59 2022 +0800
drm/amd/display: FEC check in timing validation
[ Upstream commit 7d56a154e22ffb3613fdebf83ec34d5225a22993 ]
[Why]
disable/enable leads FEC mismatch between hw/sw FEC state.
[How]
check FEC status to fastboot on/off.
Reviewed-by: Anthony Koo <Anthony.Koo@xxxxxxx>
Acked-by: Alex Hung <alex.hung@xxxxxxx>
Signed-off-by: Chiawen Huang <chiawen.huang@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 62bc6ce88753..78e17a4af4ab 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -1495,6 +1495,10 @@ bool dc_validate_seamless_boot_timing(const struct dc *dc,
if (!link->link_enc->funcs->is_dig_enabled(link->link_enc))
return false;
+ /* Check for FEC status*/
+ if (link->link_enc->funcs->fec_is_active(link->link_enc))
+ return false;
+
enc_inst = link->link_enc->funcs->get_dig_frontend(link->link_enc);
if (enc_inst == ENGINE_ID_UNKNOWN)
