linux-kernel - [PATCH 3.13.y-ckt 099/143] drm/radeon/dp: Set EDP_CONFIGURATION

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Message-Id: <1427831308-1854-100-git-send-email-kamal@canonical.com>
Date:	Tue, 31 Mar 2015 12:47:44 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Alex Deucher <alexander.deucher@....com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13.y-ckt 099/143] drm/radeon/dp: Set EDP_CONFIGURATION_SET for bridge chips if necessary

3.13.11-ckt18 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alex Deucher <alexander.deucher@....com>

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.

bug:
https://bugs.freedesktop.org/show_bug.cgi?id=42960

Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Kamal Mostafa <kamal@...onical.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)
 		radeon_write_dpcd_reg(dp_info->radeon_connector,
 				      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;
-- 
1.9.1

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