diff mbox series

[RFC,v0,08/13] drm/i915/ddi: 128b/132b SST also needs DP_TP_CTL_MODE_MST

Message ID 27c0ced3c11b635624613f901dc75f928b44a3cb.1734085515.git.jani.nikula@intel.com (mailing list archive)
State New
Headers show
Series drm/i915/dp: 128b/132b uncompressed SST | expand

Commit Message

Jani Nikula Dec. 13, 2024, 10:39 a.m. UTC 
It's not very clearly specified, and the hardware bit is ill-named, but
128b/132b SST also needs the MST mode set in the DP_TP_CTL register.

This is preparation for enabling 128b/132b SST. This path is not
reachable yet.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/display/intel_ddi.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index ec5f0534f4df..eebeebef42ed 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -3658,7 +3658,8 @@  static void mtl_ddi_prepare_link_retrain(struct intel_dp *intel_dp,
 
 	/* 6.d Configure and enable DP_TP_CTL with link training pattern 1 selected */
 	dp_tp_ctl = DP_TP_CTL_ENABLE | DP_TP_CTL_LINK_TRAIN_PAT1;
-	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DP_MST)) {
+	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DP_MST) ||
+	    intel_dp_is_uhbr(crtc_state)) {
 		dp_tp_ctl |= DP_TP_CTL_MODE_MST;
 	} else {
 		dp_tp_ctl |= DP_TP_CTL_MODE_SST;
@@ -3718,7 +3719,8 @@  static void intel_ddi_prepare_link_retrain(struct intel_dp *intel_dp,
 	}
 
 	dp_tp_ctl = DP_TP_CTL_ENABLE | DP_TP_CTL_LINK_TRAIN_PAT1;
-	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DP_MST)) {
+	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DP_MST) ||
+	    intel_dp_is_uhbr(crtc_state)) {
 		dp_tp_ctl |= DP_TP_CTL_MODE_MST;
 	} else {
 		dp_tp_ctl |= DP_TP_CTL_MODE_SST;