drm/amd/display: Workaround required for link training reliability
[Why] A software workaround is required for all vendor-built cards on platform. [How] When performing DP link training, we must send TPS1 before DPCD:100h is written with the proper bit rate value. This change must be applies in ALL cases when LT happens. Signed-off-by: David Galiffi <David.Galiffi@amd.com> Reviewed-by: Tony Cheng <Tony.Cheng@amd.com> Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com> Acked-by: Harry Wentland <harry.wentland@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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