drm/amd/display: Read eDP link settings on detection

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[Why]
Unlike external DP panels, internal eDP does not perform
verify link caps because the panel connection is fixed.

So if GOP enabled the eDP at boot, we can retain its
trained link settings to optimize.

[How]
Read the lane count and link rate by reading this
information from DPCD 100h, 101h, 115h

Signed-off-by: Anthony Koo <Anthony.Koo@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

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Anthony Koo 2019-03-25 20:33:35 -04:00 • committed by Alex Deucher

parent e54ae52429

commit 32a5b542a6

1 changed files with 30 additions and 0 deletions

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

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