[PATCH 2/2] rcar-vin: Add support for outputting NV12

[Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>]

Most Gen3 boards can output frames in NV12 format, add support for this
with a runtime check that the running hardware support it.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
---
 drivers/media/platform/rcar-vin/rcar-dma.c  |  5 ++-
 drivers/media/platform/rcar-vin/rcar-v4l2.c | 39 +++++++++++++++++----
 2 files changed, 37 insertions(+), 7 deletions(-)

diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c b/drivers/media/platform/rcar-vin/rcar-dma.c
index 3cb29b2e0b2b18a9..0edae4181cdda9fe 100644
--- a/drivers/media/platform/rcar-vin/rcar-dma.c
+++ b/drivers/media/platform/rcar-vin/rcar-dma.c
@@ -118,6 +118,7 @@
 #define VNDMR_ABIT		(1 << 2)
 #define VNDMR_DTMD_YCSEP	(1 << 1)
 #define VNDMR_DTMD_ARGB		(1 << 0)
+#define VNDMR_DTMD_YCSEP_420	(3 << 0)
 
 /* Video n Data Mode Register 2 bits */
 #define VNDMR2_VPS		(1 << 30)
@@ -710,11 +711,13 @@ static int rvin_setup(struct rvin_dev *vin)
 	 * Output format
 	 */
 	switch (vin->format.pixelformat) {
+	case V4L2_PIX_FMT_NV12:
 	case V4L2_PIX_FMT_NV16:
 		rvin_write(vin,
 			   ALIGN(vin->format.width * vin->format.height, 0x80),
 			   VNUVAOF_REG);
-		dmr = VNDMR_DTMD_YCSEP;
+		dmr = vin->format.pixelformat == V4L2_PIX_FMT_NV12 ?
+			VNDMR_DTMD_YCSEP_420 : VNDMR_DTMD_YCSEP;
 		output_is_yuv = true;
 		break;
 	case V4L2_PIX_FMT_YUYV:
diff --git a/drivers/media/platform/rcar-vin/rcar-v4l2.c b/drivers/media/platform/rcar-vin/rcar-v4l2.c
index ba08f6c49956e899..51df827d91bc0ef3 100644
--- a/drivers/media/platform/rcar-vin/rcar-v4l2.c
+++ b/drivers/media/platform/rcar-vin/rcar-v4l2.c
@@ -30,6 +30,10 @@
  */
 
 static const struct rvin_video_format rvin_formats[] = {
+	{
+		.fourcc			= V4L2_PIX_FMT_NV12,
+		.bpp			= 1,
+	},
 	{
 		.fourcc			= V4L2_PIX_FMT_NV16,
 		.bpp			= 1,
@@ -72,6 +76,9 @@ const struct rvin_video_format *rvin_format_from_pixel(struct rvin_dev *vin,
 	if (vin->info->model == RCAR_M1 && pixelformat == V4L2_PIX_FMT_XBGR32)
 		return NULL;
 
+	if (pixelformat == V4L2_PIX_FMT_NV12 && !vin->info->nv12)
+		return NULL;
+
 	for (i = 0; i < ARRAY_SIZE(rvin_formats); i++)
 		if (rvin_formats[i].fourcc == pixelformat)
 			return rvin_formats + i;
@@ -90,17 +97,29 @@ static u32 rvin_format_bytesperline(struct rvin_dev *vin,
 	if (WARN_ON(!fmt))
 		return -EINVAL;
 
-	align = pix->pixelformat == V4L2_PIX_FMT_NV16 ? 0x20 : 0x10;
+	switch (pix->pixelformat) {
+	case V4L2_PIX_FMT_NV12:
+	case V4L2_PIX_FMT_NV16:
+		align = 0x20;
+		break;
+	default:
+		align = 0x10;
+		break;
+	}
 
 	return ALIGN(pix->width, align) * fmt->bpp;
 }
 
 static u32 rvin_format_sizeimage(struct v4l2_pix_format *pix)
 {
-	if (pix->pixelformat == V4L2_PIX_FMT_NV16)
+	switch (pix->pixelformat) {
+	case V4L2_PIX_FMT_NV12:
+		return pix->bytesperline * pix->height * 3 / 2;
+	case V4L2_PIX_FMT_NV16:
 		return pix->bytesperline * pix->height * 2;
-
-	return pix->bytesperline * pix->height;
+	default:
+		return pix->bytesperline * pix->height;
+	}
 }
 
 static void rvin_format_align(struct rvin_dev *vin, struct v4l2_pix_format *pix)
@@ -132,8 +151,16 @@ static void rvin_format_align(struct rvin_dev *vin, struct v4l2_pix_format *pix)
 		break;
 	}
 
-	/* HW limit width to a multiple of 32 (2^5) for NV16 else 2 (2^1) */
-	walign = vin->format.pixelformat == V4L2_PIX_FMT_NV16 ? 5 : 1;
+	/* HW limit width to a multiple of 32 (2^5) for NV12/16 else 2 (2^1) */
+	switch (vin->format.pixelformat) {
+	case V4L2_PIX_FMT_NV12:
+	case V4L2_PIX_FMT_NV16:
+		walign = 5;
+		break;
+	default:
+		walign = 1;
+		break;
+	}
 
 	/* Limit to VIN capabilities */
 	v4l_bound_align_image(&pix->width, 2, vin->info->max_width, walign,
-- 
2.23.0