drm/radeon/kms: enable underscan option for digital connectors

This connector attribute allows you to enable or disable underscan
on a digital output to compensate for panels that automatically
overscan (e.g., many HDMI TVs).  Valid values for the attribute are:

off - forces underscan off
on - forces underscan on
auto - enables underscan if an HDMI TV is connected, off otherwise

default value is auto.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_encoders.c b/drivers/gpu/drm/radeon/radeon_encoders.c
index 5e7a0536c9c9..4a4ff983cef5 100644
--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -212,7 +212,7 @@ void radeon_encoder_set_active_device(struct drm_encoder *encoder)
         }
 }
 
-static struct drm_connector *
+struct drm_connector *
 radeon_get_connector_for_encoder(struct drm_encoder *encoder)
 {
         struct drm_device *dev = encoder->dev;
@@ -1694,6 +1694,7 @@ radeon_add_atom_encoder(struct drm_device *dev, uint32_t encoder_id, uint32_t su
         radeon_encoder->encoder_id = encoder_id;
         radeon_encoder->devices = supported_device;
         radeon_encoder->rmx_type = RMX_OFF;
+        radeon_encoder->underscan_type = UNDERSCAN_OFF;
 
         switch (radeon_encoder->encoder_id) {
         case ENCODER_OBJECT_ID_INTERNAL_LVDS:
@@ -1707,6 +1708,7 @@ radeon_add_atom_encoder(struct drm_device *dev, uint32_t encoder_id, uint32_t su
                 } else {
                         drm_encoder_init(dev, encoder, &radeon_atom_enc_funcs, DRM_MODE_ENCODER_TMDS);
                         radeon_encoder->enc_priv = radeon_atombios_set_dig_info(radeon_encoder);
+                        radeon_encoder->underscan_type = UNDERSCAN_AUTO;
                 }
                 drm_encoder_helper_add(encoder, &radeon_atom_dig_helper_funcs);
                 break;
@@ -1736,6 +1738,7 @@ radeon_add_atom_encoder(struct drm_device *dev, uint32_t encoder_id, uint32_t su
                 } else {
                         drm_encoder_init(dev, encoder, &radeon_atom_enc_funcs, DRM_MODE_ENCODER_TMDS);
                         radeon_encoder->enc_priv = radeon_atombios_set_dig_info(radeon_encoder);
+                        radeon_encoder->underscan_type = UNDERSCAN_AUTO;
                 }
                 drm_encoder_helper_add(encoder, &radeon_atom_dig_helper_funcs);
                 break;