media: coda: encoder parameter change support

Add support for dynamically changing the GOP size, bitrate, frame rate,
constant intra quantization parameter, number of intra refresh macro
blocks and slice mode parameters.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

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

@@ -698,6 +698,79 @@ static u32 coda_slice_mode(struct coda_ctx *ctx)
 	       ((1 & CODA_SLICING_MODE_MASK) << CODA_SLICING_MODE_OFFSET);
 }
 
+static int coda_enc_param_change(struct coda_ctx *ctx)
+{
+	struct coda_dev *dev = ctx->dev;
+	u32 change_enable = 0;
+	u32 success;
+	int ret;
+
+	if (ctx->params.gop_size_changed) {
+		change_enable |= CODA_PARAM_CHANGE_RC_GOP;
+		coda_write(dev, ctx->params.gop_size,
+			   CODA_CMD_ENC_PARAM_RC_GOP);
+		ctx->gopcounter = ctx->params.gop_size - 1;
+		ctx->params.gop_size_changed = false;
+	}
+	if (ctx->params.h264_intra_qp_changed) {
+		coda_dbg(1, ctx, "parameter change: intra Qp %u\n",
+			 ctx->params.h264_intra_qp);
+
+		if (ctx->params.bitrate) {
+			change_enable |= CODA_PARAM_CHANGE_RC_INTRA_QP;
+			coda_write(dev, ctx->params.h264_intra_qp,
+				   CODA_CMD_ENC_PARAM_RC_INTRA_QP);
+		}
+		ctx->params.h264_intra_qp_changed = false;
+	}
+	if (ctx->params.bitrate_changed) {
+		coda_dbg(1, ctx, "parameter change: bitrate %u kbit/s\n",
+			 ctx->params.bitrate);
+		change_enable |= CODA_PARAM_CHANGE_RC_BITRATE;
+		coda_write(dev, ctx->params.bitrate,
+			   CODA_CMD_ENC_PARAM_RC_BITRATE);
+		ctx->params.bitrate_changed = false;
+	}
+	if (ctx->params.framerate_changed) {
+		coda_dbg(1, ctx, "parameter change: frame rate %u/%u Hz\n",
+			 ctx->params.framerate & 0xffff,
+			 (ctx->params.framerate >> 16) + 1);
+		change_enable |= CODA_PARAM_CHANGE_RC_FRAME_RATE;
+		coda_write(dev, ctx->params.framerate,
+			   CODA_CMD_ENC_PARAM_RC_FRAME_RATE);
+		ctx->params.framerate_changed = false;
+	}
+	if (ctx->params.intra_refresh_changed) {
+		coda_dbg(1, ctx, "parameter change: intra refresh MBs %u\n",
+			 ctx->params.intra_refresh);
+		change_enable |= CODA_PARAM_CHANGE_INTRA_MB_NUM;
+		coda_write(dev, ctx->params.intra_refresh,
+			   CODA_CMD_ENC_PARAM_INTRA_MB_NUM);
+		ctx->params.intra_refresh_changed = false;
+	}
+	if (ctx->params.slice_mode_changed) {
+		change_enable |= CODA_PARAM_CHANGE_SLICE_MODE;
+		coda_write(dev, coda_slice_mode(ctx),
+			   CODA_CMD_ENC_PARAM_SLICE_MODE);
+		ctx->params.slice_mode_changed = false;
+	}
+
+	if (!change_enable)
+		return 0;
+
+	coda_write(dev, change_enable, CODA_CMD_ENC_PARAM_CHANGE_ENABLE);
+
+	ret = coda_command_sync(ctx, CODA_COMMAND_RC_CHANGE_PARAMETER);
+	if (ret < 0)
+		return ret;
+
+	success = coda_read(dev, CODA_RET_ENC_PARAM_CHANGE_SUCCESS);
+	if (success != 1)
+		coda_dbg(1, ctx, "parameter change failed: %u\n", success);
+
+	return 0;
+}
+
 static phys_addr_t coda_iram_alloc(struct coda_iram_info *iram, size_t size)
 {
 	phys_addr_t ret;
@@ -1143,6 +1216,9 @@ static int coda_start_encoding(struct coda_ctx *ctx)
 	}
 
 	if (ctx->params.bitrate) {
+		ctx->params.bitrate_changed = false;
+		ctx->params.h264_intra_qp_changed = false;
+
 		/* Rate control enabled */
 		value = (ctx->params.bitrate & CODA_RATECONTROL_BITRATE_MASK)
 			<< CODA_RATECONTROL_BITRATE_OFFSET;
@@ -1397,6 +1473,13 @@ static int coda_prepare_encode(struct coda_ctx *ctx)
 	u32 rot_mode = 0;
 	u32 dst_fourcc;
 	u32 reg;
+	int ret;
+
+	ret = coda_enc_param_change(ctx);
+	if (ret < 0) {
+		v4l2_warn(&ctx->dev->v4l2_dev, "parameter change failed: %d\n",
+			  ret);
+	}
 
 	src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
 	dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);

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

@@ -1317,6 +1317,7 @@ static int coda_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
 	tpf = &a->parm.output.timeperframe;
 	coda_approximate_timeperframe(tpf);
 	ctx->params.framerate = coda_timeperframe_to_frate(tpf);
+	ctx->params.framerate_changed = true;
 
 	return 0;
 }
@@ -2033,12 +2034,14 @@ static int coda_s_ctrl(struct v4l2_ctrl *ctrl)
 		break;
 	case V4L2_CID_MPEG_VIDEO_BITRATE:
 		ctx->params.bitrate = ctrl->val / 1000;
+		ctx->params.bitrate_changed = true;
 		break;
 	case V4L2_CID_MPEG_VIDEO_GOP_SIZE:
 		ctx->params.gop_size = ctrl->val;
 		break;
 	case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP:
 		ctx->params.h264_intra_qp = ctrl->val;
+		ctx->params.h264_intra_qp_changed = true;
 		break;
 	case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP:
 		ctx->params.h264_inter_qp = ctrl->val;
@@ -2086,17 +2089,21 @@ static int coda_s_ctrl(struct v4l2_ctrl *ctrl)
 		break;
 	case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
 		ctx->params.slice_mode = ctrl->val;
+		ctx->params.slice_mode_changed = true;
 		break;
 	case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB:
 		ctx->params.slice_max_mb = ctrl->val;
+		ctx->params.slice_mode_changed = true;
 		break;
 	case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES:
 		ctx->params.slice_max_bits = ctrl->val * 8;
+		ctx->params.slice_mode_changed = true;
 		break;
 	case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
 		break;
 	case V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB:
 		ctx->params.intra_refresh = ctrl->val;
+		ctx->params.intra_refresh_changed = true;
 		break;
 	case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME:
 		ctx->params.force_ipicture = true;

drivers/media/platform/coda/coda.h

@@ -137,6 +137,12 @@ struct coda_params {
 	u32			slice_max_bits;
 	u32			slice_max_mb;
 	bool			force_ipicture;
+	bool			gop_size_changed;
+	bool			bitrate_changed;
+	bool			framerate_changed;
+	bool			h264_intra_qp_changed;
+	bool			intra_refresh_changed;
+	bool			slice_mode_changed;
 };
 
 struct coda_buffer_meta {
@@ -254,6 +260,7 @@ struct coda_ctx {
 	u32				bit_stream_param;
 	u32				frm_dis_flg;
 	u32				frame_mem_ctrl;
+	u32				para_change;
 	int				display_idx;
 	struct dentry			*debugfs_entry;
 	bool				use_bit;

drivers/media/platform/coda/coda_regs.h

@@ -342,6 +342,24 @@
 #define CODA_CMD_ENC_SEQ_JPG_THUMB_SIZE				0x1a4
 #define CODA_CMD_ENC_SEQ_JPG_THUMB_OFFSET			0x1a8
 
+/* Encoder Parameter Change */
+#define CODA_CMD_ENC_PARAM_CHANGE_ENABLE	0x180
+#define		CODA_PARAM_CHANGE_RC_GOP			BIT(0)
+#define		CODA_PARAM_CHANGE_RC_INTRA_QP			BIT(1)
+#define		CODA_PARAM_CHANGE_RC_BITRATE			BIT(2)
+#define		CODA_PARAM_CHANGE_RC_FRAME_RATE			BIT(3)
+#define		CODA_PARAM_CHANGE_INTRA_MB_NUM			BIT(4)
+#define		CODA_PARAM_CHANGE_SLICE_MODE			BIT(5)
+#define		CODA_PARAM_CHANGE_HEC_MODE			BIT(6)
+#define CODA_CMD_ENC_PARAM_RC_GOP		0x184
+#define CODA_CMD_ENC_PARAM_RC_INTRA_QP		0x188
+#define CODA_CMD_ENC_PARAM_RC_BITRATE		0x18c
+#define CODA_CMD_ENC_PARAM_RC_FRAME_RATE	0x190
+#define CODA_CMD_ENC_PARAM_INTRA_MB_NUM		0x194
+#define CODA_CMD_ENC_PARAM_SLICE_MODE		0x198
+#define CODA_CMD_ENC_PARAM_HEC_MODE		0x19c
+#define CODA_RET_ENC_PARAM_CHANGE_SUCCESS	0x1c0
+
 /* Encoder Picture Run */
 #define CODA9_CMD_ENC_PIC_SRC_INDEX		0x180
 #define CODA9_CMD_ENC_PIC_SRC_STRIDE		0x184