Patch "drm/radeon: Don't drop DP 2.7 Ghz link setup on some cards." 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

drm/radeon: Don't drop DP 2.7 Ghz link setup on some cards.

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:

     drm-radeon-don-t-drop-dp-2.7-ghz-link-setup-on-some-cards.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: Mario Kleiner <[email protected]>
Date: Sun, 6 Mar 2016 02:39:53 +0100
Subject: drm/radeon: Don't drop DP 2.7 Ghz link setup on some cards.

From: Mario Kleiner <[email protected]>

commit 459ee1c3fd097ab56ababd8ff4bb7ef6a792de33 upstream.

As observed on Apple iMac10,1, DCE-3.2, RV-730, link rate of 2.7 Ghz is not selected, because the args.v1.ucConfig flag setting for 2.7 Ghz gets overwritten by a following assignment of the transmitter to use.

Move link rate setup a few lines down to fix this. In practice this didn't have any positive or negative effect on display setup on the tested iMac10,1 so i don't know if backporting to stable makes sense or not.

---
 drivers/gpu/drm/radeon/atombios_encoders.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

@@ -892,8 +892,6 @@ atombios_dig_encoder_setup2(struct drm_e
 			else
 				args.v1.ucLaneNum = 4;
 
-			if (ENCODER_MODE_IS_DP(args.v1.ucEncoderMode) && (dp_clock == 270000))
-				args.v1.ucConfig |= ATOM_ENCODER_CONFIG_DPLINKRATE_2_70GHZ;
 			switch (radeon_encoder->encoder_id) {
 			case ENCODER_OBJECT_ID_INTERNAL_UNIPHY:
 				args.v1.ucConfig = ATOM_ENCODER_CONFIG_V2_TRANSMITTER1;

@@ -910,6 +908,10 @@ atombios_dig_encoder_setup2(struct drm_e
 				args.v1.ucConfig |= ATOM_ENCODER_CONFIG_LINKB;
 			else
 				args.v1.ucConfig |= ATOM_ENCODER_CONFIG_LINKA;
+
+			if (ENCODER_MODE_IS_DP(args.v1.ucEncoderMode) && (dp_clock == 270000))
+				args.v1.ucConfig |= ATOM_ENCODER_CONFIG_DPLINKRATE_2_70GHZ;
+
 			break;
 		case 2:
 		case 3:

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

queue-4.4/drm-radeon-don-t-drop-dp-2.7-ghz-link-setup-on-some-cards.patch