Commit 8582aea2 authored Jun 11, 2020 by David Galiffi Committed by Alex Deucher Jul 01, 2020

drm/amd/display: Compare v_front_porch when checking if streams are synchronizable



[Why]
If the front porch of the two timings differ, then there may not be
enough time while both streams are in vertical blank to perform a memory
clock change. This can hang the system.

[How]
Check the each streams timing.v_front_porch when determining if the two
streams are synchronizable.

Signed-off-by: David Galiffi <David.Galiffi@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

parent 0f782777

drivers/gpu/drm/amd/display/dc/core/dc_resource.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -399,6 +399,10 @@ bool resource_are_streams_timing_synchronizable(
		!= stream2->timing.v_addressable)
		return false;

		if (stream1->timing.v_front_porch
		!= stream2->timing.v_front_porch)
		return false;

		if (stream1->timing.pix_clk_100hz
		!= stream2->timing.pix_clk_100hz)
		return false;

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