From: Jani Nikula Date: Tue, 19 Mar 2024 09:12:53 +0000 (+0200) Subject: drm/i915/mst: enable MST mode for 128b/132b single-stream sideband X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=4c8d5562a07179f944b28b57c10e133f25dae7cf;p=linux.git drm/i915/mst: enable MST mode for 128b/132b single-stream sideband If the sink supports 128b/132b and single-stream sideband messaging, enable MST mode. With this, the topology manager will still write DP_MSTM_CTRL, which should be ignored by the sink. In the future, the topology manager should probably only set the sideband messaging related parts of the register. Cc: Arun R Murthy Cc: Ville Syrjälä Reviewed-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/39d753e53cd662c3fd3776b6167bf792219fd950.1710839496.git.jani.nikula@intel.com Signed-off-by: Jani Nikula --- diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 24f7c2a9b707c..3d09cd65664db 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -4061,7 +4061,8 @@ intel_dp_mst_mode_choose(struct intel_dp *intel_dp, if (!intel_dp_mst_source_support(intel_dp)) return DRM_DP_SST; - if (sink_mst_mode == DRM_DP_SST_SIDEBAND_MSG) + if (sink_mst_mode == DRM_DP_SST_SIDEBAND_MSG && + !(intel_dp->dpcd[DP_MAIN_LINK_CHANNEL_CODING] & DP_CAP_ANSI_128B132B)) return DRM_DP_SST; return sink_mst_mode;