drm: atmel-hlcdc: add support for LVDS encoder type and bus format for sam9x7

Add support for encoder type "DRM_MODE_ENCODER_LVDS" with the following bus
formats: MEDIA_BUS_FMT_RGB888_1X7X4_SPWG, MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA,
MEDIA_BUS_FMT_RGB666_1X7X3_SPWG, MEDIA_BUS_FMT_RGB666_1X18.

Signed-off-by: Dharma Balasubiramani <dharma.b@microchip.com>

Author: Dharma Balasubiramani

drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c

@@ -320,7 +320,8 @@ static int atmel_hlcdc_connector_output_mode(struct drm_connector_state *state)
 	if (!encoder)
 		encoder = connector->encoder;
 
-	if (encoder->encoder_type == DRM_MODE_ENCODER_DSI) {
+	switch (encoder->encoder_type) {
+	case DRM_MODE_ENCODER_DSI:
 		/*
 		 * atmel-hlcdc to support DSI formats with DSI video pipeline
 		 * when DRM_MODE_ENCODER_DSI type is set by
@@ -363,7 +364,35 @@ static int atmel_hlcdc_connector_output_mode(struct drm_connector_state *state)
 				break;
 			}
 		}
-	} else {
+		break;
+	case DRM_MODE_ENCODER_LVDS:
+		switch (atmel_hlcdc_encoder_get_bus_fmt(encoder)) {
+		case 0:
+			break;
+		case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
+		case MEDIA_BUS_FMT_RGB666_1X18:
+			return ATMEL_HLCDC_RGB666_OUTPUT;
+		case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
+		case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
+		default:
+			return ATMEL_HLCDC_RGB888_OUTPUT;
+		}
+
+		for (j = 0; j < info->num_bus_formats; j++) {
+			switch (info->bus_formats[j]) {
+			case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
+			case MEDIA_BUS_FMT_RGB666_1X18:
+				supported_fmts |= ATMEL_HLCDC_RGB666_OUTPUT;
+				break;
+			case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
+			case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
+			default:
+				supported_fmts |= ATMEL_HLCDC_RGB888_OUTPUT;
+				break;
+			}
+		}
+		break;
+	default:
 		switch (atmel_hlcdc_encoder_get_bus_fmt(encoder)) {
 		case 0:
 			break;
@@ -397,6 +426,7 @@ static int atmel_hlcdc_connector_output_mode(struct drm_connector_state *state)
 				break;
 			}
 		}
+		break;
 	}
 	return supported_fmts;
 }