[3.13.y-ckt stable] Patch "drm/radeon/dp: Set EDP_CONFIGURATION_SET for bridge chips if necessary" has been added to staging queue

Kamal Mostafa kamal at canonical.com
Tue Mar 31 18:46:26 UTC 2015

This is a note to let you know that I have just added a patch titled

    drm/radeon/dp: Set EDP_CONFIGURATION_SET for bridge chips if necessary

to the linux-3.13.y-queue branch of the 3.13.y-ckt extended stable tree 
which can be found at:


This patch is scheduled to be released in version 3.13.11-ckt18.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.13.y-ckt tree, see



>From e7888a68387f67dc99e1139d778e27740dc62beb Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher at amd.com>
Date: Wed, 11 Feb 2015 18:34:36 -0500
Subject: drm/radeon/dp: Set EDP_CONFIGURATION_SET for bridge chips if

commit 66c2b84ba6256bc5399eed45582af9ebb3ba2c15 upstream.

Don't restrict it to just eDP panels.  Some LVDS bridge chips require
this.  Fixes blank panels on resume on certain laptops.  Noticed
by mrnuke on IRC.


Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
 drivers/gpu/drm/radeon/atombios_dp.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
index 719c7a1..13b458e 100644
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -700,10 +700,8 @@ static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info)
 				      DP_DOWNSPREAD_CTRL, 0);

-	if ((dp_info->connector->connector_type == DRM_MODE_CONNECTOR_eDP) &&
-	    (dig->panel_mode == DP_PANEL_MODE_INTERNAL_DP2_MODE)) {
+	if (dig->panel_mode == DP_PANEL_MODE_INTERNAL_DP2_MODE)
 		radeon_write_dpcd_reg(dp_info->radeon_connector, DP_EDP_CONFIGURATION_SET, 1);
-	}

 	/* set the lane count on the sink */
 	tmp = dp_info->dp_lane_count;

More information about the kernel-team mailing list