Wayne Lin 453b0016a0
drm/amd/display: Detect dpcd_rev when hotplug mst monitor ...
[Why]
Once mst topology is constructed, later on new connected monitors
are reported to source by CSN message. Within CSN, there is no
carried info of DPCD_REV comparing to LINK_ADDRESS reply. As the
result, we might leave some ports connected to DP but without DPCD
revision number which will affect us determining the capability of
the DP Rx.
[How]
Send out remote DPCD read when the port's dpcd_rev is 0x0 in
detect_ctx(). Firstly, read out the value from DPCD 0x2200. If the
return value is 0x0, it's likely the DP1.2 DP Rx then we reques
revision from DPCD 0x0 again.
Reviewed-by: Hersen Wu <hersenwu@amd.com >
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com >
Signed-off-by: Wayne Lin <Wayne.Lin@amd.com >
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com >
Signed-off-by: Alex Deucher <alexander.deucher@amd.com >
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453b0016a0