drm/radeon/kms: improve bpc handling (v2)

[platform/kernel/linux-arm64.git] / drivers / gpu / drm / radeon / radeon_connectors.c

diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
index bd05156..71fa389 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -84,6 +84,62 @@ static void radeon_property_change_mode(struct drm_encoder *encoder)
                                         crtc->x, crtc->y, crtc->fb);
        }
 }
+
+int radeon_get_monitor_bpc(struct drm_connector *connector)
+{
+       struct drm_device *dev = connector->dev;
+       struct radeon_device *rdev = dev->dev_private;
+       struct radeon_connector *radeon_connector = to_radeon_connector(connector);
+       struct radeon_connector_atom_dig *dig_connector;
+       int bpc = 8;
+
+       switch (connector->connector_type) {
+       case DRM_MODE_CONNECTOR_DVII:
+       case DRM_MODE_CONNECTOR_HDMIB:
+               if (radeon_connector->use_digital) {
+                       if (drm_detect_hdmi_monitor(radeon_connector->edid)) {
+                               if (connector->display_info.bpc)
+                                       bpc = connector->display_info.bpc;
+                       }
+               }
+               break;
+       case DRM_MODE_CONNECTOR_DVID:
+       case DRM_MODE_CONNECTOR_HDMIA:
+               if (drm_detect_hdmi_monitor(radeon_connector->edid)) {
+                       if (connector->display_info.bpc)
+                               bpc = connector->display_info.bpc;
+               }
+               break;
+       case DRM_MODE_CONNECTOR_DisplayPort:
+               dig_connector = radeon_connector->con_priv;
+               if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
+                   (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP) ||
+                   drm_detect_hdmi_monitor(radeon_connector->edid)) {
+                       if (connector->display_info.bpc)
+                               bpc = connector->display_info.bpc;
+               }
+               break;
+       case DRM_MODE_CONNECTOR_eDP:
+       case DRM_MODE_CONNECTOR_LVDS:
+               if (connector->display_info.bpc)
+                       bpc = connector->display_info.bpc;
+               else if (ASIC_IS_DCE41(rdev) || ASIC_IS_DCE5(rdev)) {
+                       struct drm_connector_helper_funcs *connector_funcs =
+                               connector->helper_private;
+                       struct drm_encoder *encoder = connector_funcs->best_encoder(connector);
+                       struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
+                       struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
+
+                       if (dig->lcd_misc & ATOM_PANEL_MISC_V13_6BIT_PER_COLOR)
+                               bpc = 6;
+                       else if (dig->lcd_misc & ATOM_PANEL_MISC_V13_8BIT_PER_COLOR)
+                               bpc = 8;
+               }
+               break;
+       }
+       return bpc;
+}
+
 static void
 radeon_connector_update_scratch_regs(struct drm_connector *connector, enum drm_connector_status status)
 {