drm/omap: Add a dss device operation flag for .get_modes()

Instead of manually iterating over the dss devices in the pipeline to
find the first one that implements the .get_modes() operation, add a new
operation flag for .get_modes() and use the omap_connector_find_device()
helper function to locate the right dss device.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Tested-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/displays/panel-dpi.c

@@ -152,6 +152,7 @@ static int panel_dpi_probe(struct platform_device *pdev)
 	dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 	dssdev->owner = THIS_MODULE;
 	dssdev->of_ports = BIT(0);
+	dssdev->ops_flags = OMAP_DSS_DEVICE_OP_MODES;
 	drm_bus_flags_from_videomode(&ddata->vm, &dssdev->bus_flags);
 
 	omapdss_display_init(dssdev);

drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c

@@ -1271,6 +1271,7 @@ static int dsicm_probe(struct platform_device *pdev)
 	dssdev->type = OMAP_DISPLAY_TYPE_DSI;
 	dssdev->owner = THIS_MODULE;
 	dssdev->of_ports = BIT(0);
+	dssdev->ops_flags = OMAP_DSS_DEVICE_OP_MODES;
 
 	dssdev->caps = OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE |
 		OMAP_DSS_DISPLAY_CAP_TEAR_ELIM;

drivers/gpu/drm/omapdrm/displays/panel-lgphilips-lb035q02.c

@@ -199,6 +199,7 @@ static int lb035q02_panel_spi_probe(struct spi_device *spi)
 	dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 	dssdev->owner = THIS_MODULE;
 	dssdev->of_ports = BIT(0);
+	dssdev->ops_flags = OMAP_DSS_DEVICE_OP_MODES;
 
 	/*
 	 * Note: According to the panel documentation:

drivers/gpu/drm/omapdrm/displays/panel-nec-nl8048hl11.c

@@ -194,6 +194,7 @@ static int nec_8048_probe(struct spi_device *spi)
 	dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 	dssdev->owner = THIS_MODULE;
 	dssdev->of_ports = BIT(0);
+	dssdev->ops_flags = OMAP_DSS_DEVICE_OP_MODES;
 	dssdev->bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_SYNC_POSEDGE
 			  | DRM_BUS_FLAG_PIXDATA_POSEDGE;
 

drivers/gpu/drm/omapdrm/displays/panel-sharp-ls037v7dw01.c

@@ -209,6 +209,7 @@ static int sharp_ls_probe(struct platform_device *pdev)
 	dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 	dssdev->owner = THIS_MODULE;
 	dssdev->of_ports = BIT(0);
+	dssdev->ops_flags = OMAP_DSS_DEVICE_OP_MODES;
 
 	/*
 	 * Note: According to the panel documentation:

drivers/gpu/drm/omapdrm/displays/panel-sony-acx565akm.c

@@ -708,6 +708,7 @@ static int acx565akm_probe(struct spi_device *spi)
 	dssdev->type = OMAP_DISPLAY_TYPE_SDI;
 	dssdev->owner = THIS_MODULE;
 	dssdev->of_ports = BIT(0);
+	dssdev->ops_flags = OMAP_DSS_DEVICE_OP_MODES;
 	dssdev->bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_SYNC_NEGEDGE
 			  | DRM_BUS_FLAG_PIXDATA_POSEDGE;
 

drivers/gpu/drm/omapdrm/displays/panel-tpo-td028ttec1.c

@@ -323,6 +323,7 @@ static int td028ttec1_panel_probe(struct spi_device *spi)
 	dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 	dssdev->owner = THIS_MODULE;
 	dssdev->of_ports = BIT(0);
+	dssdev->ops_flags = OMAP_DSS_DEVICE_OP_MODES;
 
 	/*
 	 * Note: According to the panel documentation:

drivers/gpu/drm/omapdrm/displays/panel-tpo-td043mtea1.c

@@ -422,6 +422,7 @@ static int tpo_td043_probe(struct spi_device *spi)
 	dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 	dssdev->owner = THIS_MODULE;
 	dssdev->of_ports = BIT(0);
+	dssdev->ops_flags = OMAP_DSS_DEVICE_OP_MODES;
 
 	/*
 	 * Note: According to the panel documentation:

drivers/gpu/drm/omapdrm/dss/omapdss.h

@@ -393,12 +393,14 @@ struct omap_dss_device_ops {
  * enum omap_dss_device_ops_flag - Indicates which device ops are supported
  * @OMAP_DSS_DEVICE_OP_DETECT: The device supports output connection detection
  * @OMAP_DSS_DEVICE_OP_HPD: The device supports all hot-plug-related operations
- * @OMAP_DSS_DEVICE_OP_EDID: The device supports readind EDID
+ * @OMAP_DSS_DEVICE_OP_EDID: The device supports reading EDID
+ * @OMAP_DSS_DEVICE_OP_MODES: The device supports reading modes
  */
 enum omap_dss_device_ops_flag {
 	OMAP_DSS_DEVICE_OP_DETECT = BIT(0),
 	OMAP_DSS_DEVICE_OP_HPD = BIT(1),
 	OMAP_DSS_DEVICE_OP_EDID = BIT(2),
+	OMAP_DSS_DEVICE_OP_MODES = BIT(3),
 };
 
 struct omap_dss_device {

drivers/gpu/drm/omapdrm/dss/venc.c

@@ -755,6 +755,7 @@ static int venc_init_output(struct venc_device *venc)
 	out->ops = &venc_ops;
 	out->owner = THIS_MODULE;
 	out->of_ports = BIT(0);
+	out->ops_flags = OMAP_DSS_DEVICE_OP_MODES;
 
 	r = omapdss_device_init_output(out);
 	if (r < 0)

drivers/gpu/drm/omapdrm/omap_connector.c

@@ -228,10 +228,10 @@ static int omap_connector_get_modes(struct drm_connector *connector)
 	 * Otherwise if the display pipeline reports modes (e.g. with a fixed
 	 * resolution panel or an analog TV output), query it.
 	 */
-	for (dssdev = omap_connector->display; dssdev; dssdev = dssdev->src) {
-		if (dssdev->ops->get_modes)
-			return dssdev->ops->get_modes(dssdev, connector);
-	}
+	dssdev = omap_connector_find_device(connector,
+					    OMAP_DSS_DEVICE_OP_MODES);
+	if (dssdev)
+		return dssdev->ops->get_modes(dssdev, connector);
 
 	/*
 	 * We can't retrieve modes, which can happen for instance for a DVI or