Re: [PATCH] V2: Currently, DRM get the capability of the mst hub only from DP_DPCD_REV and get the slower speed even the mst hub can run in the faster speed.

The commit message should be shorter and follow the format other commits for drm usually do, in this case something like: drm/dp_mst: Retrieve extended DPCD caps for topology manager On Thu, 2020-09-10 at 14:36 +0800, Koba Ko wrote: > As per DP-1.3, First check DP_EXTENDED_RECEIVER_CAP_FIELD_PRES

[PATCH] V2: Currently, DRM get the capability of the mst hub only from DP_DPCD_REV and get the slower speed even the mst hub can run in the faster speed.

As per DP-1.3, First check DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT. If DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT is 1, read the DP_DP13_DPCD_REV to get the faster capability. If DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT is 0, read DP_DPCD_REV. Signed-off-by: Koba Ko --- ChangeLog: 1. use drm_dp_read_dpc