media: rcar-vin: all Gen2 boards can scale simplify logic

The logic to preserve the requested format width and height are too
complex and come from a premature optimization for Gen3. All Gen2 SoC
can scale and the Gen3 implementation will not use these functions at
all so simply preserve the width and height when interacting with the
subdevice much like the field is preserved simplifies the logic quite a
bit.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/rcar-vin/rcar-dma.c

@@ -585,14 +585,6 @@ void rvin_crop_scale_comp(struct rvin_dev *vin)
 		0, 0);
 }
 
-void rvin_scale_try(struct rvin_dev *vin, struct v4l2_pix_format *pix,
-		    u32 width, u32 height)
-{
-	/* All VIN channels on Gen2 have scalers */
-	pix->width = width;
-	pix->height = height;
-}
-
 /* -----------------------------------------------------------------------------
  * Hardware setup
  */

drivers/media/platform/rcar-vin/rcar-v4l2.c

@@ -166,6 +166,7 @@ static int __rvin_try_format_source(struct rvin_dev *vin,
 		.which = which,
 	};
 	enum v4l2_field field;
+	u32 width, height;
 	int ret;
 
 	sd = vin_to_source(vin);
@@ -178,7 +179,10 @@ static int __rvin_try_format_source(struct rvin_dev *vin,
 
 	format.pad = vin->digital->source_pad;
 
+	/* Allow the video device to override field and to scale */
 	field = pix->field;
+	width = pix->width;
+	height = pix->height;
 
 	ret = v4l2_subdev_call(sd, pad, set_fmt, pad_cfg, &format);
 	if (ret < 0 && ret != -ENOIOCTLCMD)
@@ -186,11 +190,13 @@ static int __rvin_try_format_source(struct rvin_dev *vin,
 
 	v4l2_fill_pix_format(pix, &format.format);
 
-	pix->field = field;
-
 	source->width = pix->width;
 	source->height = pix->height;
 
+	pix->field = field;
+	pix->width = width;
+	pix->height = height;
+
 	vin_dbg(vin, "Source resolution: %ux%u\n", source->width,
 		source->height);
 
@@ -204,13 +210,9 @@ static int __rvin_try_format(struct rvin_dev *vin,
 			     struct v4l2_pix_format *pix,
 			     struct rvin_source_fmt *source)
 {
-	u32 rwidth, rheight, walign;
+	u32 walign;
 	int ret;
 
-	/* Requested */
-	rwidth = pix->width;
-	rheight = pix->height;
-
 	/* Keep current field if no specific one is asked for */
 	if (pix->field == V4L2_FIELD_ANY)
 		pix->field = vin->format.field;
@@ -248,10 +250,6 @@ static int __rvin_try_format(struct rvin_dev *vin,
 		break;
 	}
 
-	/* If source can't match format try if VIN can scale */
-	if (source->width != rwidth || source->height != rheight)
-		rvin_scale_try(vin, pix, rwidth, rheight);
-
 	/* 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;
 
@@ -270,9 +268,8 @@ static int __rvin_try_format(struct rvin_dev *vin,
 		return -EINVAL;
 	}
 
-	vin_dbg(vin, "Requested %ux%u Got %ux%u bpl: %d size: %d\n",
-		rwidth, rheight, pix->width, pix->height,
-		pix->bytesperline, pix->sizeimage);
+	vin_dbg(vin, "Format %ux%u bpl: %d size: %d\n",
+		pix->width, pix->height, pix->bytesperline, pix->sizeimage);
 
 	return 0;
 }

drivers/media/platform/rcar-vin/rcar-vin.h

@@ -175,8 +175,6 @@ void rvin_v4l2_unregister(struct rvin_dev *vin);
 const struct rvin_video_format *rvin_format_from_pixel(u32 pixelformat);
 
 /* Cropping, composing and scaling */
-void rvin_scale_try(struct rvin_dev *vin, struct v4l2_pix_format *pix,
-		    u32 width, u32 height);
 void rvin_crop_scale_comp(struct rvin_dev *vin);
 
 #endif