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

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[ Upstream commit 047db281c026de5971cedb5bb486aa29bd16a39d ]

[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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dale Zhao 2021-12-28 16:50:28 +08:00 committed by Greg Kroah-Hartman
parent 9d7d83d039
commit 85313d9bc7
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/amd/display/dc/core/dc_resource.c
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@ -1674,6 +1674,9 @@ 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;