drm/radeon/kms: handle DP bridges

Fusion hardware often has DP to VGA/LVDS/TMDS bridges to
handle non-DP encoders.  Internally we treat them mostly
like DP.
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/atombios_crtc.c

@@ -557,7 +557,8 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
 			if (connector)
 				bpc = connector->display_info.bpc;
 			encoder_mode = atombios_get_encoder_mode(encoder);
-			if (radeon_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT | ATOM_DEVICE_DFP_SUPPORT)) {
+			if ((radeon_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT | ATOM_DEVICE_DFP_SUPPORT)) ||
+			    radeon_encoder_is_dp_bridge(encoder)) {
 				if (connector) {
 					struct radeon_connector *radeon_connector = to_radeon_connector(connector);
 					struct radeon_connector_atom_dig *dig_connector =
@@ -637,7 +638,8 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
 				if (ss_enabled && ss->percentage)
 					args.v3.sInput.ucDispPllConfig |=
 						DISPPLL_CONFIG_SS_ENABLE;
-				if (radeon_encoder->devices & (ATOM_DEVICE_DFP_SUPPORT)) {
+				if (radeon_encoder->devices & (ATOM_DEVICE_DFP_SUPPORT) ||
+				    radeon_encoder_is_dp_bridge(encoder)) {
 					struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
 					if (encoder_mode == ATOM_ENCODER_MODE_DP) {
 						args.v3.sInput.ucDispPllConfig |=

drivers/gpu/drm/radeon/radeon_connectors.c

@@ -1230,8 +1230,11 @@ radeon_add_atom_connector(struct drm_device *dev,
 	struct drm_connector *connector;
 	struct radeon_connector *radeon_connector;
 	struct radeon_connector_atom_dig *radeon_dig_connector;
+	struct drm_encoder *encoder;
+	struct radeon_encoder *radeon_encoder;
 	uint32_t subpixel_order = SubPixelNone;
 	bool shared_ddc = false;
+	bool is_dp_bridge = false;
 
 	if (connector_type == DRM_MODE_CONNECTOR_Unknown)
 		return;
@@ -1263,6 +1266,21 @@ radeon_add_atom_connector(struct drm_device *dev,
 		}
 	}
 
+	/* check if it's a dp bridge */
+	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+		radeon_encoder = to_radeon_encoder(encoder);
+		if (radeon_encoder->devices & supported_device) {
+			switch (radeon_encoder->encoder_id) {
+			case ENCODER_OBJECT_ID_TRAVIS:
+			case ENCODER_OBJECT_ID_NUTMEG:
+				is_dp_bridge = true;
+				break;
+			default:
+				break;
+			}
+		}
+	}
+
 	radeon_connector = kzalloc(sizeof(struct radeon_connector), GFP_KERNEL);
 	if (!radeon_connector)
 		return;
@@ -1280,6 +1298,66 @@ radeon_add_atom_connector(struct drm_device *dev,
 		if (!radeon_connector->router_bus)
 			DRM_ERROR("Failed to assign router i2c bus! Check dmesg for i2c errors.\n");
 	}
+
+	if (is_dp_bridge) {
+		radeon_dig_connector = kzalloc(sizeof(struct radeon_connector_atom_dig), GFP_KERNEL);
+		if (!radeon_dig_connector)
+			goto failed;
+		radeon_dig_connector->igp_lane_info = igp_lane_info;
+		radeon_connector->con_priv = radeon_dig_connector;
+		drm_connector_init(dev, &radeon_connector->base, &radeon_dp_connector_funcs, connector_type);
+		drm_connector_helper_add(&radeon_connector->base, &radeon_dp_connector_helper_funcs);
+		if (i2c_bus->valid) {
+			/* add DP i2c bus */
+			if (connector_type == DRM_MODE_CONNECTOR_eDP)
+				radeon_dig_connector->dp_i2c_bus = radeon_i2c_create_dp(dev, i2c_bus, "eDP-auxch");
+			else
+				radeon_dig_connector->dp_i2c_bus = radeon_i2c_create_dp(dev, i2c_bus, "DP-auxch");
+			if (!radeon_dig_connector->dp_i2c_bus)
+				DRM_ERROR("DP: Failed to assign dp ddc bus! Check dmesg for i2c errors.\n");
+			radeon_connector->ddc_bus = radeon_i2c_lookup(rdev, i2c_bus);
+			if (!radeon_connector->ddc_bus)
+				DRM_ERROR("DP: Failed to assign ddc bus! Check dmesg for i2c errors.\n");
+		}
+		switch (connector_type) {
+		case DRM_MODE_CONNECTOR_VGA:
+		case DRM_MODE_CONNECTOR_DVIA:
+		default:
+			connector->interlace_allowed = true;
+			connector->doublescan_allowed = true;
+			break;
+		case DRM_MODE_CONNECTOR_DVII:
+		case DRM_MODE_CONNECTOR_DVID:
+		case DRM_MODE_CONNECTOR_HDMIA:
+		case DRM_MODE_CONNECTOR_HDMIB:
+		case DRM_MODE_CONNECTOR_DisplayPort:
+			drm_connector_attach_property(&radeon_connector->base,
+						      rdev->mode_info.underscan_property,
+						      UNDERSCAN_OFF);
+			drm_connector_attach_property(&radeon_connector->base,
+						      rdev->mode_info.underscan_hborder_property,
+						      0);
+			drm_connector_attach_property(&radeon_connector->base,
+						      rdev->mode_info.underscan_vborder_property,
+						      0);
+			subpixel_order = SubPixelHorizontalRGB;
+			connector->interlace_allowed = true;
+			if (connector_type == DRM_MODE_CONNECTOR_HDMIB)
+				connector->doublescan_allowed = true;
+			else
+				connector->doublescan_allowed = false;
+			break;
+		case DRM_MODE_CONNECTOR_LVDS:
+		case DRM_MODE_CONNECTOR_eDP:
+			drm_connector_attach_property(&radeon_connector->base,
+						      dev->mode_config.scaling_mode_property,
+						      DRM_MODE_SCALE_FULLSCREEN);
+			subpixel_order = SubPixelHorizontalRGB;
+			connector->interlace_allowed = false;
+			connector->doublescan_allowed = false;
+			break;
+		}
+	} else {
 		switch (connector_type) {
 		case DRM_MODE_CONNECTOR_VGA:
 			drm_connector_init(dev, &radeon_connector->base, &radeon_vga_connector_funcs, connector_type);
@@ -1490,6 +1568,7 @@ radeon_add_atom_connector(struct drm_device *dev,
 			connector->doublescan_allowed = false;
 			break;
 		}
+	}
 
 	if (radeon_connector->hpd.hpd == RADEON_HPD_NONE) {
 		if (i2c_bus->valid)

drivers/gpu/drm/radeon/radeon_encoders.c

@@ -1949,8 +1949,9 @@ static void radeon_atom_encoder_prepare(struct drm_encoder *encoder)
 	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 	struct drm_connector *connector = radeon_get_connector_for_encoder(encoder);
 
-	if (radeon_encoder->active_device &
-	    (ATOM_DEVICE_DFP_SUPPORT | ATOM_DEVICE_LCD_SUPPORT)) {
+	if ((radeon_encoder->active_device &
+	     (ATOM_DEVICE_DFP_SUPPORT | ATOM_DEVICE_LCD_SUPPORT)) ||
+	    radeon_encoder_is_dp_bridge(encoder)) {
 		struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
 		if (dig)
 			dig->dig_encoder = radeon_atom_pick_dig_encoder(encoder);