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

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@amd.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
index e8a3c31..3e34f1e 100644 (file)
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -739,10 +739,8 @@ 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;