This is a note to let you know that I've just added the patch titled
drm/amd/display: do not wait for mpc idle if tg is disabled
to the 4.19-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-do-not-wait-for-mpc-idle-if-tg-is-di.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b36db3c1a964a9d7f52a4eae0faf4ee29fc546ba
Author: Josip Pavic <Josip.Pavic@xxxxxxx>
Date: Thu Mar 24 12:08:43 2022 -0400
drm/amd/display: do not wait for mpc idle if tg is disabled
[ Upstream commit 2513ed4f937999c0446fd824f7564f76b697d722 ]
[Why]
When booting, the driver waits for the MPC idle bit to be set as part of
pipe initialization. However, on some systems this occurs before OTG is
enabled, and since the MPC idle bit won't be set until the vupdate
signal occurs (which requires OTG to be enabled), this never happens and
the wait times out. This can add hundreds of milliseconds to the boot
time.
[How]
Do not wait for mpc idle if tg is disabled
Reviewed-by: Jun Lei <Jun.Lei@xxxxxxx>
Acked-by: Pavle Kotarac <Pavle.Kotarac@xxxxxxx>
Signed-off-by: Josip Pavic <Josip.Pavic@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Stable-dep-of: 5a25cefc0920 ("drm/amd/display: check TG is non-null before checking if enabled")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
index ead221ccb93e0..fc75337aa0a7f 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
@@ -2529,7 +2529,8 @@ static void dcn10_wait_for_mpcc_disconnect(
if (pipe_ctx->stream_res.opp->mpcc_disconnect_pending[mpcc_inst]) {
struct hubp *hubp = get_hubp_by_inst(res_pool, mpcc_inst);
- res_pool->mpc->funcs->wait_for_idle(res_pool->mpc, mpcc_inst);
+ if (pipe_ctx->stream_res.tg->funcs->is_tg_enabled(pipe_ctx->stream_res.tg))
+ res_pool->mpc->funcs->wait_for_idle(res_pool->mpc, mpcc_inst);
pipe_ctx->stream_res.opp->mpcc_disconnect_pending[mpcc_inst] = false;
hubp->funcs->set_blank(hubp, true);
/*DC_LOG_ERROR(dc->ctx->logger,
