Patch "[PATCH 114/135] drm/radeon/mst: fix regression in lane/link handling." has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

[PATCH 114/135] drm/radeon/mst: fix regression in lane/link handling.

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
0114-drm-radeon-mst-fix-regression-in-lane-link-handling.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Dave Airlie <[email protected]>
Date: Tue, 22 Mar 2016 09:38:18 +1000
Subject: [PATCH 114/135] drm/radeon/mst: fix regression in lane/link handling.

[ Upstream commit b36f7d26a7fdc0b07b1217368ee09bb8560269f8 ]

The function this used changed in
092c96a8ab9d1bd60ada2ed385cc364ce084180e
drm/radeon: fix dp link rate selection (v2)

However for MST we should just always train to the max link/rate. Though we probably need to limit this for future hw, in theory radeon won't support it.

This fixes my 30" monitor with MST enabled.

---
 drivers/gpu/drm/radeon/radeon_dp_mst.c |   12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

@@ -525,17 +525,9 @@ static bool radeon_mst_mode_fixup(struct
 	drm_mode_set_crtcinfo(adjusted_mode, 0);
 	{
 	  struct radeon_connector_atom_dig *dig_connector;
-	  int ret;
-
 	  dig_connector = mst_enc->connector->con_priv;
-	  ret = radeon_dp_get_dp_link_config(&mst_enc->connector->base,
-					     dig_connector->dpcd, adjusted_mode->clock,
-					     &dig_connector->dp_lane_count,
-					     &dig_connector->dp_clock);
-	  if (ret) {
-		  dig_connector->dp_lane_count = 0;
-		  dig_connector->dp_clock = 0;
-	  }
+	  dig_connector->dp_lane_count = drm_dp_max_lane_count(dig_connector->dpcd);
+	  dig_connector->dp_clock = drm_dp_max_link_rate(dig_connector->dpcd);
 	  DRM_DEBUG_KMS("dig clock %p %d %d\n", dig_connector,
 			dig_connector->dp_lane_count, dig_connector->dp_clock);
 	}

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/0114-drm-radeon-mst-fix-regression-in-lane-link-handling.patch