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Commit a504ad26 authored by Hugo Hu's avatar Hugo Hu Committed by Alex Deucher
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drm/amd/display: Handle branch device with DFP count = 0 case.



[Why]
When you have a SST branch device the driver, Even no sink device connected,
it also send HPD with a valid EDID. Driver will config it to DP sink.
Therefore, there're two displays in display setting.

DPCD 0x05, DFP_PRESENT = 1 (branch device),
DFP_TYPE = 00 (Display Port)

[How]
Driver determine DPCD 0x05 DFP_PRESENT = 1(branch) as an active dongle
And check DFP count.

Signed-off-by: default avatarHugo Hu <hugo.hu@amd.com>
Reviewed-by: default avatarHugo Hu <Hugo.Hu@amd.com>
Acked-by: default avatarBhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 3ae42acd
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