linux-kernel - [PATCH 3.4 034/172] drm/radeon/dp: Set EDP_CONFIGURATION

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Message-Id: <1434443826-4929-34-git-send-email-lizf@kernel.org>
Date:	Tue, 16 Jun 2015 16:34:48 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Alex Deucher <alexander.deucher@....com>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 034/172] drm/radeon/dp: Set EDP_CONFIGURATION_SET for bridge chips if necessary

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

3.4.108-rc1 review patch.  If anyone has any objections, please let me know.

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


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>
[lizf: Backported to 3.4: adjust context]
Signed-off-by: Zefan Li <lizefan@...wei.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 8d1724c..5325c20 100644
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -777,10 +777,8 @@ 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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