media: coda: Add control for h.264 chroma qp index offset

Allow to set a fixed quantization parameter offset between luma and
chroma in the h.264 encoder.
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: NHans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: NMauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/platform/coda/coda-bit.c

@@ -1012,7 +1012,9 @@ static int coda_start_encoding(struct coda_ctx *ctx)
 			  CODA_264PARAM_DEBLKFILTEROFFSETBETA_MASK) <<
 			 CODA_264PARAM_DEBLKFILTEROFFSETBETA_OFFSET) |
 			(ctx->params.h264_constrained_intra_pred_flag <<
-			 CODA_264PARAM_CONSTRAINEDINTRAPREDFLAG_OFFSET);
+			 CODA_264PARAM_CONSTRAINEDINTRAPREDFLAG_OFFSET) |
+			(ctx->params.h264_chroma_qp_index_offset &
+			 CODA_264PARAM_CHROMAQPOFFSET_MASK);
 		coda_write(dev, value, CODA_CMD_ENC_SEQ_264_PARA);
 		break;
 	case V4L2_PIX_FMT_JPEG:

drivers/media/platform/coda/coda-common.c

@@ -1842,6 +1842,9 @@ static int coda_s_ctrl(struct v4l2_ctrl *ctrl)
 	case V4L2_CID_MPEG_VIDEO_H264_CONSTRAINED_INTRA_PREDICTION:
 		ctx->params.h264_constrained_intra_pred_flag = ctrl->val;
 		break;
+	case V4L2_CID_MPEG_VIDEO_H264_CHROMA_QP_INDEX_OFFSET:
+		ctx->params.h264_chroma_qp_index_offset = ctrl->val;
+		break;
 	case V4L2_CID_MPEG_VIDEO_H264_PROFILE:
 		/* TODO: switch between baseline and constrained baseline */
 		if (ctx->inst_type == CODA_INST_ENCODER)
@@ -1931,6 +1934,8 @@ static void coda_encode_ctrls(struct coda_ctx *ctx)
 	v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
 		V4L2_CID_MPEG_VIDEO_H264_CONSTRAINED_INTRA_PREDICTION, 0, 1, 1,
 		0);
+	v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
+		V4L2_CID_MPEG_VIDEO_H264_CHROMA_QP_INDEX_OFFSET, -12, 12, 1, 0);
 	v4l2_ctrl_new_std_menu(&ctx->ctrls, &coda_ctrl_ops,
 		V4L2_CID_MPEG_VIDEO_H264_PROFILE,
 		V4L2_MPEG_VIDEO_H264_PROFILE_BASELINE, 0x0,

drivers/media/platform/coda/coda.h

@@ -119,6 +119,7 @@ struct coda_params {
 	s8			h264_slice_alpha_c0_offset_div2;
 	s8			h264_slice_beta_offset_div2;
 	bool			h264_constrained_intra_pred_flag;
+	s8			h264_chroma_qp_index_offset;
 	u8			h264_profile_idc;
 	u8			h264_level_idc;
 	u8			mpeg4_intra_qp;