drm: atmel-hlcdc: add support for DSI output formats

Add support for the following DPI mode if the encoder type
is DSI as per the XLCDC IP datasheet:
- 16BPPCFG1
- 16BPPCFG2
- 16BPPCFG3
- 18BPPCFG1
- 18BPPCFG2
- 24BPP

Signed-off-by: Manikandan Muralidharan <manikandan.m@microchip.com>
[durai.manickamkr@microchip.com: update output format using is_xlcdc flag]
Signed-off-by: Durai Manickam KR <durai.manickamkr@microchip.com>

Author: manikandan-m11

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

@@ -295,11 +295,18 @@ static void atmel_hlcdc_crtc_atomic_enable(struct drm_crtc *c,
 
 }
 
-#define ATMEL_HLCDC_RGB444_OUTPUT	BIT(0)
-#define ATMEL_HLCDC_RGB565_OUTPUT	BIT(1)
-#define ATMEL_HLCDC_RGB666_OUTPUT	BIT(2)
-#define ATMEL_HLCDC_RGB888_OUTPUT	BIT(3)
-#define ATMEL_HLCDC_OUTPUT_MODE_MASK	GENMASK(3, 0)
+#define ATMEL_HLCDC_RGB444_OUTPUT		BIT(0)
+#define ATMEL_HLCDC_RGB565_OUTPUT		BIT(1)
+#define ATMEL_HLCDC_RGB666_OUTPUT		BIT(2)
+#define ATMEL_HLCDC_RGB888_OUTPUT		BIT(3)
+#define ATMEL_HLCDC_DPI_RGB565C1_OUTPUT		BIT(4)
+#define ATMEL_HLCDC_DPI_RGB565C2_OUTPUT		BIT(5)
+#define ATMEL_HLCDC_DPI_RGB565C3_OUTPUT		BIT(6)
+#define ATMEL_HLCDC_DPI_RGB666C1_OUTPUT		BIT(7)
+#define ATMEL_HLCDC_DPI_RGB666C2_OUTPUT		BIT(8)
+#define ATMEL_HLCDC_DPI_RGB888_OUTPUT		BIT(9)
+#define ATMEL_HLCDC_OUTPUT_MODE_MASK		GENMASK(3, 0)
+#define ATMEL_XLCDC_OUTPUT_MODE_MASK		GENMASK(9, 0)
 
 static int atmel_hlcdc_connector_output_mode(struct drm_connector_state *state)
 {
@@ -313,53 +320,99 @@ static int atmel_hlcdc_connector_output_mode(struct drm_connector_state *state)
 	if (!encoder)
 		encoder = connector->encoder;
 
-	switch (atmel_hlcdc_encoder_get_bus_fmt(encoder)) {
-	case 0:
-		break;
-	case MEDIA_BUS_FMT_RGB444_1X12:
-		return ATMEL_HLCDC_RGB444_OUTPUT;
-	case MEDIA_BUS_FMT_RGB565_1X16:
-		return ATMEL_HLCDC_RGB565_OUTPUT;
-	case MEDIA_BUS_FMT_RGB666_1X18:
-		return ATMEL_HLCDC_RGB666_OUTPUT;
-	case MEDIA_BUS_FMT_RGB888_1X24:
-		return ATMEL_HLCDC_RGB888_OUTPUT;
-	default:
-		return -EINVAL;
-	}
-
-	for (j = 0; j < info->num_bus_formats; j++) {
-		switch (info->bus_formats[j]) {
-		case MEDIA_BUS_FMT_RGB444_1X12:
-			supported_fmts |= ATMEL_HLCDC_RGB444_OUTPUT;
+	if (encoder->encoder_type == DRM_MODE_ENCODER_DSI) {
+		/*
+		 * atmel-hlcdc to support DSI formats with DSI video pipeline
+		 * when DRM_MODE_ENCODER_DSI type is set by
+		 * connector driver component.
+		 */
+		switch (atmel_hlcdc_encoder_get_bus_fmt(encoder)) {
+		case 0:
 			break;
 		case MEDIA_BUS_FMT_RGB565_1X16:
-			supported_fmts |= ATMEL_HLCDC_RGB565_OUTPUT;
-			break;
+			return ATMEL_HLCDC_DPI_RGB565C1_OUTPUT;
 		case MEDIA_BUS_FMT_RGB666_1X18:
-			supported_fmts |= ATMEL_HLCDC_RGB666_OUTPUT;
-			break;
+			return ATMEL_HLCDC_DPI_RGB666C1_OUTPUT;
+		case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
+			return ATMEL_HLCDC_DPI_RGB666C2_OUTPUT;
 		case MEDIA_BUS_FMT_RGB888_1X24:
-			supported_fmts |= ATMEL_HLCDC_RGB888_OUTPUT;
-			break;
+			return ATMEL_HLCDC_DPI_RGB888_OUTPUT;
 		default:
+			return -EINVAL;
+		}
+
+		for (j = 0; j < info->num_bus_formats; j++) {
+			switch (info->bus_formats[j]) {
+			case MEDIA_BUS_FMT_RGB565_1X16:
+				supported_fmts |=
+					ATMEL_HLCDC_DPI_RGB565C1_OUTPUT;
+				break;
+			case MEDIA_BUS_FMT_RGB666_1X18:
+				supported_fmts |=
+					ATMEL_HLCDC_DPI_RGB666C1_OUTPUT;
+				break;
+			case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
+				supported_fmts |=
+					ATMEL_HLCDC_DPI_RGB666C2_OUTPUT;
+				break;
+			case MEDIA_BUS_FMT_RGB888_1X24:
+				supported_fmts |=
+					ATMEL_HLCDC_DPI_RGB888_OUTPUT;
+				break;
+			default:
+				break;
+			}
+		}
+	} else {
+		switch (atmel_hlcdc_encoder_get_bus_fmt(encoder)) {
+		case 0:
 			break;
+		case MEDIA_BUS_FMT_RGB444_1X12:
+			return ATMEL_HLCDC_RGB444_OUTPUT;
+		case MEDIA_BUS_FMT_RGB565_1X16:
+			return ATMEL_HLCDC_RGB565_OUTPUT;
+		case MEDIA_BUS_FMT_RGB666_1X18:
+			return ATMEL_HLCDC_RGB666_OUTPUT;
+		case MEDIA_BUS_FMT_RGB888_1X24:
+			return ATMEL_HLCDC_RGB888_OUTPUT;
+		default:
+			return -EINVAL;
 		}
-	}
 
+		for (j = 0; j < info->num_bus_formats; j++) {
+			switch (info->bus_formats[j]) {
+			case MEDIA_BUS_FMT_RGB444_1X12:
+				supported_fmts |= ATMEL_HLCDC_RGB444_OUTPUT;
+				break;
+			case MEDIA_BUS_FMT_RGB565_1X16:
+				supported_fmts |= ATMEL_HLCDC_RGB565_OUTPUT;
+				break;
+			case MEDIA_BUS_FMT_RGB666_1X18:
+				supported_fmts |= ATMEL_HLCDC_RGB666_OUTPUT;
+				break;
+			case MEDIA_BUS_FMT_RGB888_1X24:
+				supported_fmts |= ATMEL_HLCDC_RGB888_OUTPUT;
+				break;
+			default:
+				break;
+			}
+		}
+	}
 	return supported_fmts;
 }
 
 static int atmel_hlcdc_crtc_select_output_mode(struct drm_crtc_state *state)
 {
-	unsigned int output_fmts = ATMEL_HLCDC_OUTPUT_MODE_MASK;
+	unsigned int output_fmts;
 	struct atmel_hlcdc_crtc_state *hstate;
 	struct drm_connector_state *cstate;
 	struct drm_connector *connector;
-	struct atmel_hlcdc_crtc *crtc;
+	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(state->crtc);
 	int i;
+	bool is_xlcdc = crtc->dc->desc->is_xlcdc;
 
-	crtc = drm_crtc_to_atmel_hlcdc_crtc(state->crtc);
+	output_fmts = is_xlcdc ? ATMEL_XLCDC_OUTPUT_MODE_MASK :
+		      ATMEL_HLCDC_OUTPUT_MODE_MASK;
 
 	for_each_new_connector_in_state(state->state, connector, cstate, i) {
 		unsigned int supported_fmts = 0;
@@ -380,7 +433,7 @@ static int atmel_hlcdc_crtc_select_output_mode(struct drm_crtc_state *state)
 
 	hstate = drm_crtc_state_to_atmel_hlcdc_crtc_state(state);
 	hstate->output_mode = fls(output_fmts) - 1;
-	if (crtc->dc->desc->is_xlcdc) {
+	if (is_xlcdc) {
 		/* check if MIPI DPI bit needs to be set */
 		if (fls(output_fmts) > 3) {
 			hstate->output_mode -= 4;