This is a note to let you know that I've just added the patch titled
drm/amd/display: Screen corruption on dual displays (DP+USB-C)
to the 5.8-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-screen-corruption-on-dual-displays-d.patch
and it can be found in the queue-5.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 94712920b777e4588d0ed90412e2d560a051441f
Author: Qingqing Zhuo <qingqing.zhuo@xxxxxxx>
Date: Thu Jul 30 15:35:41 2020 -0400
drm/amd/display: Screen corruption on dual displays (DP+USB-C)
[ Upstream commit ce271b40a91f781af3dee985c39e841ac5148766 ]
[why]
Current pipe merge and split logic only supports cases where new
dc_state is allocated and relies on dc->current_state to gather
information from previous dc_state.
Calls to validate_bandwidth on UPDATE_TYPE_MED would cause an issue
because there is no new dc_state allocated, and data in
dc->current_state would be overwritten during pipe merge.
[how]
Only allow validate_bandwidth when new dc_state space is created.
Signed-off-by: Qingqing Zhuo <qingqing.zhuo@xxxxxxx>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@xxxxxxx>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@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 d016f50e187c8..d261f425b80ec 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -2538,7 +2538,7 @@ void dc_commit_updates_for_stream(struct dc *dc,
copy_stream_update_to_stream(dc, context, stream, stream_update);
- if (update_type > UPDATE_TYPE_FAST) {
+ if (update_type >= UPDATE_TYPE_FULL) {
if (!dc->res_pool->funcs->validate_bandwidth(dc, context, false)) {
DC_ERROR("Mode validation failed for stream update!\n");
dc_release_state(context);
diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
index 20bdabebbc434..76cd4f3de4eaf 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
@@ -3165,6 +3165,9 @@ static noinline bool dcn20_validate_bandwidth_fp(struct dc *dc,
context->bw_ctx.dml.soc.allow_dram_clock_one_display_vactive =
dc->debug.enable_dram_clock_change_one_display_vactive;
+ /*Unsafe due to current pipe merge and split logic*/
+ ASSERT(context != dc->current_state);
+
if (fast_validate) {
return dcn20_validate_bandwidth_internal(dc, context, true);
}
diff --git a/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c b/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
index f00a568350848..c6ab3dee4fd69 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
@@ -1184,6 +1184,9 @@ bool dcn21_validate_bandwidth(struct dc *dc, struct dc_state *context,
BW_VAL_TRACE_COUNT();
+ /*Unsafe due to current pipe merge and split logic*/
+ ASSERT(context != dc->current_state);
+
out = dcn20_fast_validate_bw(dc, context, pipes, &pipe_cnt, pipe_split_from, &vlevel);
if (pipe_cnt == 0)
