This is a note to let you know that I've just added the patch titled drm/amd/display: Fix for the no Audio bug with Tiled Displays to the 5.15-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-fix-for-the-no-audio-bug-with-tiled-.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit fd1b32c27b3a8e15275a1cc711b40b051da8aef1 Author: Mustapha Ghaddar <mghaddar@xxxxxxx> Date: Mon Nov 15 17:56:42 2021 -0500 drm/amd/display: Fix for the no Audio bug with Tiled Displays [ Upstream commit 5ceaebcda9061c04f439c93961f0819878365c0f ] [WHY] It seems like after a series of plug/unplugs we end up in a situation where tiled display doesnt support Audio. [HOW] The issue seems to be related to when we check streams changed after an HPD, we should be checking the audio_struct as well to see if any of its values changed. Reviewed-by: Jun Lei <Jun.Lei@xxxxxxx> Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@xxxxxxx> Signed-off-by: Mustapha Ghaddar <mustapha.ghaddar@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_resource.c b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c index a60396d5be445..e94546187cf15 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c @@ -1623,6 +1623,10 @@ bool dc_is_stream_unchanged( if (old_stream->ignore_msa_timing_param != stream->ignore_msa_timing_param) return false; + // Only Have Audio left to check whether it is same or not. This is a corner case for Tiled sinks + if (old_stream->audio_info.mode_count != stream->audio_info.mode_count) + return false; + return true; }