drm/radeon/kms: properly set panel mode for eDP

This should make eDP more reliable.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
index 79e8ebc05307..b5628ce1228b 100644
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -553,6 +553,7 @@ static void radeon_dp_set_panel_mode(struct drm_encoder *encoder,
 {
         struct drm_device *dev = encoder->dev;
         struct radeon_device *rdev = dev->dev_private;
+        struct radeon_connector *radeon_connector = to_radeon_connector(connector);
         int panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE;
 
         if (!ASIC_IS_DCE4(rdev))
@@ -560,10 +561,20 @@ static void radeon_dp_set_panel_mode(struct drm_encoder *encoder,
 
         if (radeon_connector_encoder_is_dp_bridge(connector))
                 panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE;
+        else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
+                u8 tmp = radeon_read_dpcd_reg(radeon_connector, DP_EDP_CONFIGURATION_CAP);
+                if (tmp & 1)
+                        panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE;
+        }
 
         atombios_dig_encoder_setup(encoder,
                                    ATOM_ENCODER_CMD_SETUP_PANEL_MODE,
                                    panel_mode);
+
+        if ((connector->connector_type == DRM_MODE_CONNECTOR_eDP) &&
+            (panel_mode == DP_PANEL_MODE_INTERNAL_DP2_MODE)) {
+                radeon_write_dpcd_reg(radeon_connector, DP_EDP_CONFIGURATION_SET, 1);
+        }
 }
 
 void radeon_dp_set_link_config(struct drm_connector *connector,