[PATCH v1 2/4] drm: bridge: cdns-mhdp8546: Modify atomic_get_input_bus_format bridge function

[Yuti Amonkar]

Modify atomic_get_input_bus_format function to return input formats
based on the output format instead of using hardcoded value.

Signed-off-by: Yuti Amonkar <yamonkar at cadence.com>
---
 .../drm/bridge/cadence/cdns-mhdp8546-core.c   | 110 ++++++++++++++++--
 1 file changed, 100 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
index bdb0d95aa412..623eadb8948f 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
@@ -2078,27 +2078,117 @@ cdns_mhdp_bridge_atomic_reset(struct drm_bridge *bridge)
 	return &cdns_mhdp_state->base;
 }
 
+static const u32 cdns_mhdp_bus_fmts[] = {
+	MEDIA_BUS_FMT_YUV16_1X48,
+	MEDIA_BUS_FMT_RGB161616_1X48,
+	MEDIA_BUS_FMT_UYVY12_1X24,
+	MEDIA_BUS_FMT_YUV12_1X36,
+	MEDIA_BUS_FMT_RGB121212_1X36,
+	MEDIA_BUS_FMT_UYVY10_1X20,
+	MEDIA_BUS_FMT_YUV10_1X30,
+	MEDIA_BUS_FMT_RGB101010_1X30,
+	MEDIA_BUS_FMT_UYVY8_1X16,
+	MEDIA_BUS_FMT_YUV8_1X24,
+	MEDIA_BUS_FMT_RGB888_1X24
+};
+
+static bool cdns_mhdp_format_supported(u32 output_fmt)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(cdns_mhdp_bus_fmts); i++) {
+		if (output_fmt == cdns_mhdp_bus_fmts[i])
+			return true;
+	}
+
+	return false;
+}
+
+#define MAX_INPUT_FORMAT 4
+
 static u32 *cdns_mhdp_get_input_bus_fmts(struct drm_bridge *bridge,
-				      struct drm_bridge_state *bridge_state,
-				      struct drm_crtc_state *crtc_state,
-				      struct drm_connector_state *conn_state,
-				      u32 output_fmt,
-				      unsigned int *num_input_fmts)
+					 struct drm_bridge_state *bridge_state,
+					 struct drm_crtc_state *crtc_state,
+					 struct drm_connector_state *conn_state,
+					 u32 output_fmt,
+					 unsigned int *num_input_fmts)
 {
 	u32 *input_fmts;
-	u32 default_bus_format = MEDIA_BUS_FMT_RGB121212_1X36;
+	unsigned int i = 0;
 
 	*num_input_fmts = 0;
 
-	if (output_fmt != MEDIA_BUS_FMT_FIXED)
+	if (!cdns_mhdp_format_supported(output_fmt) &&
+	    output_fmt != MEDIA_BUS_FMT_FIXED)
 		return NULL;
 
-	input_fmts = kzalloc(sizeof(*input_fmts), GFP_KERNEL);
+	input_fmts = kcalloc(MAX_INPUT_FORMAT,
+			     sizeof(*input_fmts), GFP_KERNEL);
 	if (!input_fmts)
 		return NULL;
 
-	*num_input_fmts = 1;
-	input_fmts[0] = default_bus_format;
+	switch (output_fmt) {
+	/* RGB */
+	case MEDIA_BUS_FMT_RGB161616_1X48:
+		input_fmts[i++] = MEDIA_BUS_FMT_RGB161616_1X48;
+		input_fmts[i++] = MEDIA_BUS_FMT_RGB121212_1X36;
+		input_fmts[i++] = MEDIA_BUS_FMT_RGB101010_1X30;
+		input_fmts[i++] = MEDIA_BUS_FMT_RGB888_1X24;
+		break;
+	case MEDIA_BUS_FMT_RGB121212_1X36:
+		input_fmts[i++] = MEDIA_BUS_FMT_RGB121212_1X36;
+		input_fmts[i++] = MEDIA_BUS_FMT_RGB101010_1X30;
+		input_fmts[i++] = MEDIA_BUS_FMT_RGB888_1X24;
+		break;
+	case MEDIA_BUS_FMT_RGB101010_1X30:
+		input_fmts[i++] = MEDIA_BUS_FMT_RGB101010_1X30;
+		input_fmts[i++] = MEDIA_BUS_FMT_RGB888_1X24;
+		break;
+	case MEDIA_BUS_FMT_RGB888_1X24:
+		input_fmts[i++] = MEDIA_BUS_FMT_RGB888_1X24;
+		break;
+
+	/* YUV444 */
+	case MEDIA_BUS_FMT_YUV16_1X48:
+		input_fmts[i++] = MEDIA_BUS_FMT_YUV16_1X48;
+		input_fmts[i++] = MEDIA_BUS_FMT_YUV12_1X36;
+		input_fmts[i++] = MEDIA_BUS_FMT_YUV10_1X30;
+		input_fmts[i++] = MEDIA_BUS_FMT_YUV8_1X24;
+		break;
+	case MEDIA_BUS_FMT_YUV12_1X36:
+		input_fmts[i++] = MEDIA_BUS_FMT_YUV12_1X36;
+		input_fmts[i++] = MEDIA_BUS_FMT_YUV10_1X30;
+		input_fmts[i++] = MEDIA_BUS_FMT_YUV8_1X24;
+		break;
+	case MEDIA_BUS_FMT_YUV10_1X30:
+		input_fmts[i++] = MEDIA_BUS_FMT_YUV10_1X30;
+		input_fmts[i++] = MEDIA_BUS_FMT_YUV8_1X24;
+		break;
+	case MEDIA_BUS_FMT_YUV8_1X24:
+		input_fmts[i++] = MEDIA_BUS_FMT_YUV8_1X24;
+		break;
+
+	/* YUV422 */
+	case MEDIA_BUS_FMT_UYVY12_1X24:
+		input_fmts[i++] = MEDIA_BUS_FMT_UYVY12_1X24;
+		input_fmts[i++] = MEDIA_BUS_FMT_UYVY10_1X20;
+		input_fmts[i++] = MEDIA_BUS_FMT_UYVY8_1X16;
+		break;
+	case MEDIA_BUS_FMT_UYVY10_1X20:
+		input_fmts[i++] = MEDIA_BUS_FMT_UYVY10_1X20;
+		input_fmts[i++] = MEDIA_BUS_FMT_UYVY8_1X16;
+		break;
+	case MEDIA_BUS_FMT_UYVY8_1X16:
+		input_fmts[i++] = MEDIA_BUS_FMT_UYVY8_1X16;
+		break;
+
+	case MEDIA_BUS_FMT_FIXED:
+		input_fmts[i++] = MEDIA_BUS_FMT_RGB121212_1X36;
+		break;
+	}
+
+	*num_input_fmts = i;
+
 	return input_fmts;
 }
 
-- 
2.17.1