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linux5.7: add Navi hang fix

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q66 2020-07-07 22:23:53 +02:00
parent 8c51b886be
commit 856a8cea75
1 changed files with 51 additions and 0 deletions
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srcpkgs/linux5.7/patches/6eb3cf2e06d22b2b08e6b0ab48cb9c05a8e1a107.patch Normal file
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@ -0,0 +1,51 @@
From 6eb3cf2e06d22b2b08e6b0ab48cb9c05a8e1a107 Mon Sep 17 00:00:00 2001
From: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Date: Mon, 29 Jun 2020 13:03:52 -0400
Subject: [PATCH] drm/amd/display: Only revalidate bandwidth on medium and fast
updates
[Why]
Changes that are fast don't require updating DLG parameters making
this call unnecessary. Considering this is an expensive call it should
not be done on every flip.
DML touches clocks, p-state support, DLG params and a few other DC
internal flags and these aren't expected during fast. A hang has been
reported with this change when called on every flip which suggests that
modifying these fields is not recommended behavior on fast updates.
[How]
Guard the validation to only happen if update type isn't FAST.
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1191
Fixes: a24eaa5c51255b ("drm/amd/display: Revalidate bandwidth before commiting DC updates")
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Roman Li <Roman.Li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
---
drivers/gpu/drm/amd/display/dc/core/dc.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 6f93a6ca4cf0c..d016f50e187c8 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -2538,10 +2538,12 @@ void dc_commit_updates_for_stream(struct dc *dc,
copy_stream_update_to_stream(dc, context, stream, stream_update);
- if (!dc->res_pool->funcs->validate_bandwidth(dc, context, false)) {
- DC_ERROR("Mode validation failed for stream update!\n");
- dc_release_state(context);
- return;
+ if (update_type > UPDATE_TYPE_FAST) {
+ if (!dc->res_pool->funcs->validate_bandwidth(dc, context, false)) {
+ DC_ERROR("Mode validation failed for stream update!\n");
+ dc_release_state(context);
+ return;
+ }
}
commit_planes_for_stream(