drm/bridge: ti-tfp410: Set the bus_format

The TFP410 supports 24 bit, single-edge and 12 bit, dual-edge modes.
Depending on how many wires are used (24/12) the driver can set the correct
bus_format.

If the information is not available in DT then assume 24 bit, single-edge
setup.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190401124143.17179-3-peter.ujfalusi@ti.com

drivers/gpu/drm/bridge/ti-tfp410.c

@@ -29,6 +29,7 @@ struct tfp410 {
 	struct drm_connector	connector;
 	unsigned int		connector_type;
 
+	u32			bus_format;
 	struct i2c_adapter	*ddc;
 	struct gpio_desc	*hpd;
 	int			hpd_irq;
@@ -139,6 +140,9 @@ static int tfp410_attach(struct drm_bridge *bridge)
 		return ret;
 	}
 
+	drm_display_info_set_bus_formats(&dvi->connector.display_info,
+					 &dvi->bus_format, 1);
+
 	drm_connector_attach_encoder(&dvi->connector,
 					  bridge->encoder);
 
@@ -197,6 +201,7 @@ static int tfp410_parse_timings(struct tfp410 *dvi, bool i2c)
 	struct drm_bridge_timings *timings = &dvi->timings;
 	struct device_node *ep;
 	u32 pclk_sample = 0;
+	u32 bus_width = 24;
 	s32 deskew = 0;
 
 	/* Start with defaults. */
@@ -221,6 +226,7 @@ static int tfp410_parse_timings(struct tfp410 *dvi, bool i2c)
 
 	/* Get the sampling edge from the endpoint. */
 	of_property_read_u32(ep, "pclk-sample", &pclk_sample);
+	of_property_read_u32(ep, "bus-width", &bus_width);
 	of_node_put(ep);
 
 	timings->input_bus_flags = DRM_BUS_FLAG_DE_HIGH;
@@ -238,6 +244,17 @@ static int tfp410_parse_timings(struct tfp410 *dvi, bool i2c)
 		return -EINVAL;
 	}
 
+	switch (bus_width) {
+	case 12:
+		dvi->bus_format = MEDIA_BUS_FMT_RGB888_2X12_LE;
+		break;
+	case 24:
+		dvi->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+		break;
+	default:
+		return -EINVAL;
+	}
+
 	/* Get the setup and hold time from vendor-specific properties. */
 	of_property_read_u32(dvi->dev->of_node, "ti,deskew", (u32 *)&deskew);
 	if (deskew < -4 || deskew > 3)