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

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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>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher
2015-02-11 18:34:36 -05:00
parent 96abd10ecc
commit 66c2b84ba6
1 changed files with 1 additions and 3 deletions
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drivers/gpu/drm/radeon/atombios_dp.c
+1 -3
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@@ -623,10 +623,8 @@ static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info)
drm_dp_dpcd_writeb(dp_info->aux,
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)
drm_dp_dpcd_writeb(dp_info->aux, DP_EDP_CONFIGURATION_SET, 1);
}
/* set the lane count on the sink */
tmp = dp_info->dp_lane_count;