drm/amd/display: do not set RX back to SST mode for non 0 mst stream count

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[why]
a recent regression has caused us to mistakenly switch RX back to SST mode
when there are remaining mst stream enabled to the link. We are missing
a condition check for stream count before setting RX back to SST mode.

[how]
Add stream count check condition back and do some further refactor so the
logic is easier to understand to prevent future coding error in this sequence.

Reviewed-by: Samson Tam <Samson.Tam@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Wenjing Liu 2023-01-30 18:21:29 -05:00 • committed by Alex Deucher

parent 3a61570415

commit fbc0c790b1

3 changed files with 25 additions and 41 deletions

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51

drivers/gpu/drm/amd/display/dc/link/link_dpms.c

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11

drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_phy.c

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4

drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_phy.h

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