media: rkisp1: Allow setting color space on resizer sink pad

The resizer doesn't deal with color spaces, so it can accept any color
space on its input, and propagates it unchanged to its output. When
operating with a Bayer input format (in pass-through mode) further
restrict the YCbCr encoding and quantization to Rec 601 and full range
respectively, as for raw data the former ought to be ignored and the
latter is always full range.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Dafna Hirschfeld <dafna@fastmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/platform/rockchip/rkisp1/rkisp1-resizer.c

@@ -507,6 +507,7 @@ static void rkisp1_rsz_set_sink_fmt(struct rkisp1_resizer *rsz,
 	const struct rkisp1_mbus_info *mbus_info;
 	struct v4l2_mbus_framefmt *sink_fmt, *src_fmt;
 	struct v4l2_rect *sink_crop;
+	bool is_yuv;
 
 	sink_fmt = rkisp1_rsz_get_pad_fmt(rsz, sd_state, RKISP1_RSZ_PAD_SINK,
 					  which);
@@ -528,9 +529,6 @@ static void rkisp1_rsz_set_sink_fmt(struct rkisp1_resizer *rsz,
 	if (which == V4L2_SUBDEV_FORMAT_ACTIVE)
 		rsz->pixel_enc = mbus_info->pixel_enc;
 
-	/* Propagete to source pad */
-	src_fmt->code = sink_fmt->code;
-
 	sink_fmt->width = clamp_t(u32, format->width,
 				  RKISP1_ISP_MIN_WIDTH,
 				  RKISP1_ISP_MAX_WIDTH);
@@ -538,8 +536,45 @@ static void rkisp1_rsz_set_sink_fmt(struct rkisp1_resizer *rsz,
 				   RKISP1_ISP_MIN_HEIGHT,
 				   RKISP1_ISP_MAX_HEIGHT);
 
+	/*
+	 * Adjust the color space fields. Accept any color primaries and
+	 * transfer function for both YUV and Bayer. For YUV any YCbCr encoding
+	 * and quantization range is also accepted. For Bayer formats, the YCbCr
+	 * encoding isn't applicable, and the quantization range can only be
+	 * full.
+	 */
+	is_yuv = mbus_info->pixel_enc == V4L2_PIXEL_ENC_YUV;
+
+	sink_fmt->colorspace = format->colorspace ? :
+			       (is_yuv ? V4L2_COLORSPACE_SRGB :
+				V4L2_COLORSPACE_RAW);
+	sink_fmt->xfer_func = format->xfer_func ? :
+			      V4L2_MAP_XFER_FUNC_DEFAULT(sink_fmt->colorspace);
+	if (is_yuv) {
+		sink_fmt->ycbcr_enc = format->ycbcr_enc ? :
+			V4L2_MAP_YCBCR_ENC_DEFAULT(sink_fmt->colorspace);
+		sink_fmt->quantization = format->quantization ? :
+			V4L2_MAP_QUANTIZATION_DEFAULT(false, sink_fmt->colorspace,
+						      sink_fmt->ycbcr_enc);
+	} else {
+		/*
+		 * The YCbCr encoding isn't applicable for non-YUV formats, but
+		 * V4L2 has no "no encoding" value. Hardcode it to Rec. 601, it
+		 * should be ignored by userspace.
+		 */
+		sink_fmt->ycbcr_enc = V4L2_YCBCR_ENC_601;
+		sink_fmt->quantization = V4L2_QUANTIZATION_FULL_RANGE;
+	}
+
 	*format = *sink_fmt;
 
+	/* Propagate the media bus code and color space to the source pad. */
+	src_fmt->code = sink_fmt->code;
+	src_fmt->colorspace = sink_fmt->colorspace;
+	src_fmt->xfer_func = sink_fmt->xfer_func;
+	src_fmt->ycbcr_enc = sink_fmt->ycbcr_enc;
+	src_fmt->quantization = sink_fmt->quantization;
+
 	/* Update sink crop */
 	rkisp1_rsz_set_sink_crop(rsz, sd_state, sink_crop, which);
 }