Commit 047db281 authored Dec 28, 2021 by Dale Zhao Committed by Alex Deucher Jan 18, 2022

drm/amd/display: Add signal type check when verify stream backends same



[Why]
For allow eDP hot-plug feature, the stream signal may change to VIRTUAL
when plug-out and back to eDP when plug-in. OS will still setPathMode
with same timing for each plugging, but eDP gets no stream update as we
don't check signal type changing back as keeping it VIRTUAL. It's also
unsafe for future cases that stream signal is switched with same timing.

[How]
Check stream signal type change include previous HDMI signal case.

Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Wayne Lin <wayne.lin@amd.com>
Signed-off-by: Dale Zhao <dale.zhao@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

parent 9338cb71

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

+3 −0

Original line number	Diff line number	Diff line
		@@ -1640,6 +1640,9 @@ static bool are_stream_backends_same(
		if (is_timing_changed(stream_a, stream_b))
		return false;

		if (stream_a->signal != stream_b->signal)
		return false;

		if (stream_a->dpms_off != stream_b->dpms_off)
		return false;