This is a note to let you know that I've just added the patch titled drm/amd/display: wait for vblank during pipe programming to the 6.1-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-wait-for-vblank-during-pipe-programm.patch and it can be found in the queue-6.1 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit d95b8c93a902b64a6728ea28d65b374bdb7c7ed1 Author: Haiyi Zhou <Haiyi.Zhou@xxxxxxx> Date: Thu Oct 20 11:46:54 2022 -0400 drm/amd/display: wait for vblank during pipe programming [ Upstream commit 203ccaf586446b578909de1b763278033fb74b51 ] [WHY] Skipping vblank during global sync update request can result in underflow on certain displays. [HOW] Roll back to the previous behavior where DC waits for vblank during pipe programming. Fixes: 5d3e14421410 ("drm/amd/display: do not wait for vblank during pipe programming") Tested-by: Mark Broadworth <mark.broadworth@xxxxxxx> Reviewed-by: Martin Leung <Martin.Leung@xxxxxxx> Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx> Signed-off-by: Haiyi Zhou <Haiyi.Zhou@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/dcn20/dcn20_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c index a7e0001a8f46..a34c2cd78dd5 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c +++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c @@ -1640,10 +1640,8 @@ static void dcn20_program_pipe( pipe_ctx->pipe_dlg_param.vupdate_width); if (pipe_ctx->stream->mall_stream_config.type != SUBVP_PHANTOM) { - pipe_ctx->stream_res.tg->funcs->wait_for_state( - pipe_ctx->stream_res.tg, CRTC_STATE_VBLANK); - pipe_ctx->stream_res.tg->funcs->wait_for_state( - pipe_ctx->stream_res.tg, CRTC_STATE_VACTIVE); + pipe_ctx->stream_res.tg->funcs->wait_for_state(pipe_ctx->stream_res.tg, CRTC_STATE_VBLANK); + pipe_ctx->stream_res.tg->funcs->wait_for_state(pipe_ctx->stream_res.tg, CRTC_STATE_VACTIVE); } pipe_ctx->stream_res.tg->funcs->set_vtg_params(