drm/amd/display: determine USB C DP2 mode only when USB DP Alt is enabled

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[why]
When display is connected with a native DP port, DP2 mode register value
is a don't care. Driver mistakenly reduce max supported lane count to 2
lane based on the don't care value.

[how]
Add additional check only if USB C DP alt mode is enabled, we will
determine max lane count supported based on current mode.

Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Wenjing Liu 2020-04-05 16:41:13 -04:00 • committed by Alex Deucher

parent 4404b47852

commit 8ccf0e2076

10 changed files with 101 additions and 64 deletions

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4

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

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15

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

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20

drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c

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3

drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.h

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20

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_link_encoder.c

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3

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_link_encoder.h

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60

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_link_encoder.c

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4

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_link_encoder.h

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27

drivers/gpu/drm/amd/display/dc/dcn21/dcn21_link_encoder.c

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9

drivers/gpu/drm/amd/display/dc/virtual/virtual_link_encoder.c

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