media: cedrus: Use H264_SCALING_MATRIX only when required

Baseline, Main and Extended profiles are specified to
not support a scaling matrix. Also, High profiles
can optionally specify a scaling matrix, using
SPS and PPS NAL units.

To meet this expectation, applications are required to
set the V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX control
and set the V4L2_H264_PPS_FLAG_SCALING_MATRIX_PRESENT
flag only when a scaling matrix is specified for a picture.

Implement this on cedrus, which has hardware support for this
case.
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/sunxi/cedrus/cedrus.c

@@ -76,7 +76,7 @@ static const struct cedrus_control cedrus_controls[] = {
 			.id	= V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX,
 		},
 		.codec		= CEDRUS_CODEC_H264,
-		.required	= true,
+		.required	= false,
 	},
 	{
 		.cfg = {

drivers/staging/media/sunxi/cedrus/cedrus_h264.c

@@ -238,8 +238,12 @@ static void cedrus_write_scaling_lists(struct cedrus_ctx *ctx,
 {
 	const struct v4l2_ctrl_h264_scaling_matrix *scaling =
 		run->h264.scaling_matrix;
+	const struct v4l2_ctrl_h264_pps *pps = run->h264.pps;
 	struct cedrus_dev *dev = ctx->dev;
 
+	if (!(pps->flags & V4L2_H264_PPS_FLAG_SCALING_MATRIX_PRESENT))
+		return;
+
 	cedrus_h264_write_sram(dev, CEDRUS_SRAM_H264_SCALING_LIST_8x8_0,
 			       scaling->scaling_list_8x8[0],
 			       sizeof(scaling->scaling_list_8x8[0]));
@@ -442,6 +446,8 @@ static void cedrus_set_params(struct cedrus_ctx *ctx,
 	reg |= (pps->second_chroma_qp_index_offset & 0x3f) << 16;
 	reg |= (pps->chroma_qp_index_offset & 0x3f) << 8;
 	reg |= (pps->pic_init_qp_minus26 + 26 + slice->slice_qp_delta) & 0x3f;
+	if (pps->flags & V4L2_H264_PPS_FLAG_SCALING_MATRIX_PRESENT)
+		reg |= VE_H264_SHS_QP_SCALING_MATRIX_DEFAULT;
 	cedrus_write(dev, VE_H264_SHS_QP, reg);
 
 	// clear status flags