media: staging: tegra-vde: Support V4L stateless video decoder API

Expose Tegra video decoder as a generic V4L M2M stateless video decoder.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/staging/media/tegra-vde/Kconfig

@@ -2,9 +2,16 @@
 config TEGRA_VDE
 	tristate "NVIDIA Tegra Video Decoder Engine driver"
 	depends on ARCH_TEGRA || COMPILE_TEST
+	depends on VIDEO_DEV && VIDEO_V4L2
 	select DMA_SHARED_BUFFER
 	select IOMMU_IOVA
+	select MEDIA_CONTROLLER
+	select MEDIA_CONTROLLER_REQUEST_API
 	select SRAM
+	select VIDEOBUF2_DMA_CONTIG
+	select VIDEOBUF2_DMA_SG
+	select V4L2_H264
+	select V4L2_MEM2MEM_DEV
 	help
 	    Say Y here to enable support for the NVIDIA Tegra video decoder
 	    driver.

drivers/staging/media/tegra-vde/Makefile

 # SPDX-License-Identifier: GPL-2.0
-tegra-vde-y := vde.o iommu.o dmabuf-cache.o h264.o
+tegra-vde-y := vde.o iommu.o dmabuf-cache.o h264.o v4l2.o
 obj-$(CONFIG_TEGRA_VDE)	+= tegra-vde.o

drivers/staging/media/tegra-vde/h264.c

@@ -11,10 +11,18 @@
 #include <linux/reset.h>
 #include <linux/slab.h>
 
+#include <media/v4l2-h264.h>
+
 #include "trace.h"
 #include "uapi.h"
 #include "vde.h"
 
+struct h264_reflists {
+	u8 p[V4L2_H264_NUM_DPB_ENTRIES];
+	u8 b0[V4L2_H264_NUM_DPB_ENTRIES];
+	u8 b1[V4L2_H264_NUM_DPB_ENTRIES];
+};
+
 static int tegra_vde_wait_mbe(struct tegra_vde *vde)
 {
 	u32 tmp;
@@ -125,8 +133,8 @@ static void tegra_vde_setup_frameid(struct tegra_vde *vde,
 	u32 y_addr  = frame ? frame->y_addr  : 0x6CDEAD00;
 	u32 cb_addr = frame ? frame->cb_addr : 0x6CDEAD00;
 	u32 cr_addr = frame ? frame->cr_addr : 0x6CDEAD00;
-	u32 value1 = frame ? ((mbs_width << 16) | mbs_height) : 0;
-	u32 value2 = frame ? ((((mbs_width + 1) >> 1) << 6) | 1) : 0;
+	u32 value1 = frame ? ((frame->luma_atoms_pitch << 16) | mbs_height) : 0;
+	u32 value2 = frame ? ((frame->chroma_atoms_pitch << 6) | 1) : 0;
 
 	tegra_vde_writel(vde, y_addr  >> 8, vde->frameid, 0x000 + frameid * 4);
 	tegra_vde_writel(vde, cb_addr >> 8, vde->frameid, 0x100 + frameid * 4);
@@ -645,3 +653,295 @@ int tegra_vde_decode_h264(struct tegra_vde *vde,
 
 	return tegra_vde_decode_end(vde);
 }
+
+static struct vb2_buffer *get_ref_buf(struct tegra_ctx *ctx,
+				      struct vb2_v4l2_buffer *dst,
+				      unsigned int dpb_idx)
+{
+	const struct v4l2_h264_dpb_entry *dpb = ctx->h264.decode_params->dpb;
+	struct vb2_queue *cap_q = &ctx->fh.m2m_ctx->cap_q_ctx.q;
+	int buf_idx = -1;
+
+	if (dpb[dpb_idx].flags & V4L2_H264_DPB_ENTRY_FLAG_ACTIVE)
+		buf_idx = vb2_find_timestamp(cap_q,
+					     dpb[dpb_idx].reference_ts, 0);
+
+	/*
+	 * If a DPB entry is unused or invalid, address of current destination
+	 * buffer is returned.
+	 */
+	if (buf_idx < 0)
+		return &dst->vb2_buf;
+
+	return vb2_get_buffer(cap_q, buf_idx);
+}
+
+static int tegra_vde_validate_vb_size(struct tegra_ctx *ctx,
+				      struct vb2_buffer *vb,
+				      unsigned int plane_id,
+				      size_t min_size)
+{
+	u64 offset = vb->planes[plane_id].data_offset;
+	struct device *dev = ctx->vde->dev;
+
+	if (offset + min_size > vb2_plane_size(vb, plane_id)) {
+		dev_err(dev, "Too small plane[%u] size %lu @0x%llX, should be at least %zu\n",
+			plane_id, vb2_plane_size(vb, plane_id), offset, min_size);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int tegra_vde_h264_setup_frame(struct tegra_ctx *ctx,
+				      struct tegra_vde_h264_decoder_ctx *h264,
+				      struct v4l2_h264_reflist_builder *b,
+				      struct vb2_buffer *vb,
+				      unsigned int ref_id,
+				      unsigned int id)
+{
+	struct v4l2_pix_format_mplane *pixfmt = &ctx->decoded_fmt.fmt.pix_mp;
+	struct tegra_m2m_buffer *tb = vb_to_tegra_buf(vb);
+	struct tegra_ctx_h264 *h = &ctx->h264;
+	struct tegra_vde *vde = ctx->vde;
+	struct device *dev = vde->dev;
+	unsigned int cstride, lstride;
+	unsigned int flags = 0;
+	size_t lsize, csize;
+	int err, frame_num;
+
+	lsize = h264->pic_width_in_mbs * 16 * h264->pic_height_in_mbs * 16;
+	csize = h264->pic_width_in_mbs *  8 * h264->pic_height_in_mbs *  8;
+	lstride = pixfmt->plane_fmt[0].bytesperline;
+	cstride = pixfmt->plane_fmt[1].bytesperline;
+
+	err = tegra_vde_validate_vb_size(ctx, vb, 0, lsize);
+	if (err)
+		return err;
+
+	err = tegra_vde_validate_vb_size(ctx, vb, 1, csize);
+	if (err)
+		return err;
+
+	err = tegra_vde_validate_vb_size(ctx, vb, 2, csize);
+	if (err)
+		return err;
+
+	if (!tb->aux || tb->aux->size < csize) {
+		dev_err(dev, "Too small aux size %zd, should be at least %zu\n",
+			tb->aux ? tb->aux->size : -1, csize);
+		return -EINVAL;
+	}
+
+	if (id == 0) {
+		frame_num = h->decode_params->frame_num;
+
+		if (h->decode_params->nal_ref_idc)
+			flags |= FLAG_REFERENCE;
+	} else {
+		frame_num = b->refs[ref_id].frame_num;
+	}
+
+	if (tb->b_frame)
+		flags |= FLAG_B_FRAME;
+
+	vde->frames[id].flags = flags;
+	vde->frames[id].y_addr = tb->dma_addr[0];
+	vde->frames[id].cb_addr = tb->dma_addr[1];
+	vde->frames[id].cr_addr = tb->dma_addr[2];
+	vde->frames[id].aux_addr = tb->aux->dma_addr;
+	vde->frames[id].frame_num = frame_num & 0x7fffff;
+	vde->frames[id].luma_atoms_pitch = lstride / VDE_ATOM;
+	vde->frames[id].chroma_atoms_pitch = cstride / VDE_ATOM;
+
+	return 0;
+}
+
+static int tegra_vde_h264_setup_frames(struct tegra_ctx *ctx,
+				       struct tegra_vde_h264_decoder_ctx *h264)
+{
+	struct vb2_v4l2_buffer *src = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
+	struct vb2_v4l2_buffer *dst = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
+	const struct v4l2_h264_dpb_entry *dpb = ctx->h264.decode_params->dpb;
+	struct tegra_m2m_buffer *tb = vb_to_tegra_buf(&dst->vb2_buf);
+	struct tegra_ctx_h264 *h = &ctx->h264;
+	struct v4l2_h264_reflist_builder b;
+	struct h264_reflists reflists;
+	struct vb2_buffer *ref;
+	unsigned int i;
+	u8 *dpb_id;
+	int err;
+
+	/*
+	 * Tegra hardware requires information about frame's type, assuming
+	 * that frame consists of the same type slices. Userspace must tag
+	 * frame's type appropriately.
+	 *
+	 * Decoding of a non-uniform frames isn't supported by hardware and
+	 * require software preprocessing that we don't implement. Decoding
+	 * is expected to fail in this case. Such video streams are rare in
+	 * practice, so not a big deal.
+	 *
+	 * If userspace doesn't tell us frame's type, then we will try decode
+	 * as-is.
+	 */
+	v4l2_m2m_buf_copy_metadata(src, dst, true);
+
+	if (h->decode_params->flags & V4L2_H264_DECODE_PARAM_FLAG_BFRAME)
+		tb->b_frame = true;
+	else
+		tb->b_frame = false;
+
+	err = tegra_vde_h264_setup_frame(ctx, h264, NULL, &dst->vb2_buf, 0,
+					 h264->dpb_frames_nb++);
+	if (err)
+		return err;
+
+	if (!(h->decode_params->flags & (V4L2_H264_DECODE_PARAM_FLAG_PFRAME |
+					 V4L2_H264_DECODE_PARAM_FLAG_BFRAME)))
+		return 0;
+
+	v4l2_h264_init_reflist_builder(&b, h->decode_params, h->sps, dpb);
+
+	if (h->decode_params->flags & V4L2_H264_DECODE_PARAM_FLAG_BFRAME) {
+		v4l2_h264_build_b_ref_lists(&b, reflists.b0, reflists.b1);
+		dpb_id = reflists.b0;
+	} else {
+		v4l2_h264_build_p_ref_list(&b, reflists.p);
+		dpb_id = reflists.p;
+	}
+
+	for (i = 0; i < b.num_valid; i++) {
+		ref = get_ref_buf(ctx, dst, dpb_id[i]);
+
+		err = tegra_vde_h264_setup_frame(ctx, h264, &b, ref, dpb_id[i],
+						 h264->dpb_frames_nb++);
+		if (err)
+			return err;
+
+		if (b.refs[dpb_id[i]].pic_order_count < b.cur_pic_order_count)
+			h264->dpb_ref_frames_with_earlier_poc_nb++;
+	}
+
+	return 0;
+}
+
+static unsigned int to_tegra_vde_h264_level_idc(unsigned int level_idc)
+{
+	switch (level_idc) {
+	case 11:
+		return 2;
+	case 12:
+		return 3;
+	case 13:
+		return 4;
+	case 20:
+		return 5;
+	case 21:
+		return 6;
+	case 22:
+		return 7;
+	case 30:
+		return 8;
+	case 31:
+		return 9;
+	case 32:
+		return 10;
+	case 40:
+		return 11;
+	case 41:
+		return 12;
+	case 42:
+		return 13;
+	case 50:
+		return 14;
+	default:
+		break;
+	}
+
+	return 15;
+}
+
+static int tegra_vde_h264_setup_context(struct tegra_ctx *ctx,
+					struct tegra_vde_h264_decoder_ctx *h264)
+{
+	struct tegra_ctx_h264 *h = &ctx->h264;
+	struct tegra_vde *vde = ctx->vde;
+	struct device *dev = vde->dev;
+	int err;
+
+	memset(h264, 0, sizeof(*h264));
+	memset(vde->frames, 0, sizeof(vde->frames));
+
+	tegra_vde_prepare_control_data(ctx, V4L2_CID_STATELESS_H264_DECODE_PARAMS);
+	tegra_vde_prepare_control_data(ctx, V4L2_CID_STATELESS_H264_SPS);
+	tegra_vde_prepare_control_data(ctx, V4L2_CID_STATELESS_H264_PPS);
+
+	/* CABAC unsupported by hardware, requires software preprocessing */
+	if (h->pps->flags & V4L2_H264_PPS_FLAG_ENTROPY_CODING_MODE)
+		return -EOPNOTSUPP;
+
+	if (h->sps->profile_idc == 66)
+		h264->baseline_profile = 1;
+
+	if (h->sps->flags & V4L2_H264_SPS_FLAG_DIRECT_8X8_INFERENCE)
+		h264->direct_8x8_inference_flag = 1;
+
+	if (h->pps->flags & V4L2_H264_PPS_FLAG_CONSTRAINED_INTRA_PRED)
+		h264->constrained_intra_pred_flag = 1;
+
+	if (h->pps->flags & V4L2_H264_PPS_FLAG_DEBLOCKING_FILTER_CONTROL_PRESENT)
+		h264->deblocking_filter_control_present_flag = 1;
+
+	if (h->pps->flags & V4L2_H264_PPS_FLAG_BOTTOM_FIELD_PIC_ORDER_IN_FRAME_PRESENT)
+		h264->pic_order_present_flag = 1;
+
+	h264->level_idc				= to_tegra_vde_h264_level_idc(h->sps->level_idc);
+	h264->log2_max_pic_order_cnt_lsb	= h->sps->log2_max_pic_order_cnt_lsb_minus4 + 4;
+	h264->log2_max_frame_num		= h->sps->log2_max_frame_num_minus4 + 4;
+	h264->pic_order_cnt_type		= h->sps->pic_order_cnt_type;
+	h264->pic_width_in_mbs			= h->sps->pic_width_in_mbs_minus1 + 1;
+	h264->pic_height_in_mbs			= h->sps->pic_height_in_map_units_minus1 + 1;
+
+	h264->num_ref_idx_l0_active_minus1	= h->pps->num_ref_idx_l0_default_active_minus1;
+	h264->num_ref_idx_l1_active_minus1	= h->pps->num_ref_idx_l1_default_active_minus1;
+	h264->chroma_qp_index_offset		= h->pps->chroma_qp_index_offset & 0x1f;
+	h264->pic_init_qp			= h->pps->pic_init_qp_minus26 + 26;
+
+	err = tegra_vde_h264_setup_frames(ctx, h264);
+	if (err)
+		return err;
+
+	err = tegra_vde_validate_h264_ctx(dev, h264);
+	if (err)
+		return err;
+
+	return 0;
+}
+
+int tegra_vde_h264_decode_run(struct tegra_ctx *ctx)
+{
+	struct vb2_v4l2_buffer *src = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
+	struct tegra_m2m_buffer *bitstream = vb_to_tegra_buf(&src->vb2_buf);
+	size_t bitstream_size = vb2_get_plane_payload(&src->vb2_buf, 0);
+	struct tegra_vde_h264_decoder_ctx h264;
+	struct tegra_vde *vde = ctx->vde;
+	int err;
+
+	err = tegra_vde_h264_setup_context(ctx, &h264);
+	if (err)
+		return err;
+
+	err = tegra_vde_decode_begin(vde, &h264, vde->frames,
+				     bitstream->dma_addr[0],
+				     bitstream_size);
+	if (err)
+		return err;
+
+	return 0;
+}
+
+int tegra_vde_h264_decode_wait(struct tegra_ctx *ctx)
+{
+	return tegra_vde_decode_end(ctx->vde);
+}

drivers/staging/media/tegra-vde/vde.c

@@ -53,7 +53,7 @@ void tegra_vde_set_bits(struct tegra_vde *vde, u32 mask,
 	tegra_vde_writel(vde, value | mask, base, offset);
 }
 
-static int tegra_vde_alloc_bo(struct tegra_vde *vde,
+int tegra_vde_alloc_bo(struct tegra_vde *vde,
 		       struct tegra_vde_bo **ret_bo,
 		       enum dma_data_direction dma_dir,
 		       size_t size)
@@ -126,7 +126,7 @@ static int tegra_vde_alloc_bo(struct tegra_vde *vde,
 	return err;
 }
 
-static void tegra_vde_free_bo(struct tegra_vde_bo *bo)
+void tegra_vde_free_bo(struct tegra_vde_bo *bo)
 {
 	struct tegra_vde *vde = bo->vde;
 	struct device *dev = vde->miscdev.parent;
@@ -332,6 +332,8 @@ static int tegra_vde_ioctl_decode_h264(struct tegra_vde *vde,
 
 		dpb_frames[i].flags = frames[i].flags;
 		dpb_frames[i].frame_num = frames[i].frame_num;
+		dpb_frames[i].luma_atoms_pitch = ctx.pic_width_in_mbs;
+		dpb_frames[i].chroma_atoms_pitch = cstride / VDE_ATOM;
 
 		dma_dir = (i == 0) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
 
@@ -626,8 +628,16 @@ static int tegra_vde_probe(struct platform_device *pdev)
 		goto err_free_secure_bo;
 	}
 
+	err = tegra_vde_v4l2_init(vde);
+	if (err) {
+		dev_err(dev, "Failed to initialize V4L2: %d\n", err);
+		goto misc_unreg;
+	}
+
 	return 0;
 
+misc_unreg:
+	misc_deregister(&vde->miscdev);
 err_free_secure_bo:
 	tegra_vde_free_bo(vde->secure_bo);
 err_pm_runtime:
@@ -648,6 +658,7 @@ static int tegra_vde_remove(struct platform_device *pdev)
 	struct tegra_vde *vde = platform_get_drvdata(pdev);
 	struct device *dev = &pdev->dev;
 
+	tegra_vde_v4l2_deinit(vde);
 	misc_deregister(&vde->miscdev);
 
 	tegra_vde_free_bo(vde->secure_bo);
@@ -722,20 +733,73 @@ static const struct dev_pm_ops tegra_vde_pm_ops = {
 				tegra_vde_pm_resume)
 };
 
+static const u32 tegra124_decoded_fmts[] = {
+	/* TBD: T124 supports only a non-standard Tegra tiled format */
+};
+
+static const struct tegra_coded_fmt_desc tegra124_coded_fmts[] = {
+	{
+		.fourcc = V4L2_PIX_FMT_H264_SLICE,
+		.frmsize = {
+			.min_width = 16,
+			.max_width = 1920,
+			.step_width = 16,
+			.min_height = 16,
+			.max_height = 2032,
+			.step_height = 16,
+		},
+		.num_decoded_fmts = ARRAY_SIZE(tegra124_decoded_fmts),
+		.decoded_fmts = tegra124_decoded_fmts,
+		.decode_run = tegra_vde_h264_decode_run,
+		.decode_wait = tegra_vde_h264_decode_wait,
+	},
+};
+
+static const u32 tegra20_decoded_fmts[] = {
+	V4L2_PIX_FMT_YUV420M,
+	V4L2_PIX_FMT_YVU420M,
+};
+
+static const struct tegra_coded_fmt_desc tegra20_coded_fmts[] = {
+	{
+		.fourcc = V4L2_PIX_FMT_H264_SLICE,
+		.frmsize = {
+			.min_width = 16,
+			.max_width = 1920,
+			.step_width = 16,
+			.min_height = 16,
+			.max_height = 2032,
+			.step_height = 16,
+		},
+		.num_decoded_fmts = ARRAY_SIZE(tegra20_decoded_fmts),
+		.decoded_fmts = tegra20_decoded_fmts,
+		.decode_run = tegra_vde_h264_decode_run,
+		.decode_wait = tegra_vde_h264_decode_wait,
+	},
+};
+
 static const struct tegra_vde_soc tegra124_vde_soc = {
 	.supports_ref_pic_marking = true,
+	.coded_fmts = tegra124_coded_fmts,
+	.num_coded_fmts = ARRAY_SIZE(tegra124_coded_fmts),
 };
 
 static const struct tegra_vde_soc tegra114_vde_soc = {
 	.supports_ref_pic_marking = true,
+	.coded_fmts = tegra20_coded_fmts,
+	.num_coded_fmts = ARRAY_SIZE(tegra20_coded_fmts),
 };
 
 static const struct tegra_vde_soc tegra30_vde_soc = {
 	.supports_ref_pic_marking = false,
+	.coded_fmts = tegra20_coded_fmts,
+	.num_coded_fmts = ARRAY_SIZE(tegra20_coded_fmts),
 };
 
 static const struct tegra_vde_soc tegra20_vde_soc = {
 	.supports_ref_pic_marking = false,
+	.coded_fmts = tegra20_coded_fmts,
+	.num_coded_fmts = ARRAY_SIZE(tegra20_coded_fmts),
 };
 
 static const struct of_device_id tegra_vde_of_match[] = {

drivers/staging/media/tegra-vde/vde.h

@@ -15,6 +15,16 @@
 #include <linux/miscdevice.h>
 #include <linux/mutex.h>
 #include <linux/types.h>
+#include <linux/workqueue.h>
+
+#include <media/media-device.h>
+#include <media/videobuf2-dma-contig.h>
+#include <media/videobuf2-dma-sg.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-mem2mem.h>
 
 #define ICMDQUE_WR		0x00
 #define CMDQUE_CONTROL		0x08
@@ -25,9 +35,15 @@
 #define BSE_ICMDQUE_EMPTY	BIT(3)
 #define BSE_DMA_BUSY		BIT(23)
 
+#define BSEV_ALIGN		SZ_1
+#define FRAMEID_ALIGN		SZ_256
+#define SXE_BUFFER		SZ_32K
+#define VDE_ATOM		SZ_16
+
 struct clk;
 struct dma_buf;
 struct gen_pool;
+struct tegra_ctx;
 struct iommu_group;
 struct iommu_domain;
 struct reset_control;
@@ -46,10 +62,23 @@ struct tegra_video_frame {
 	dma_addr_t aux_addr;
 	u32 frame_num;
 	u32 flags;
+	u32 luma_atoms_pitch;
+	u32 chroma_atoms_pitch;
+};
+
+struct tegra_coded_fmt_desc {
+	u32 fourcc;
+	struct v4l2_frmsize_stepwise frmsize;
+	unsigned int num_decoded_fmts;
+	const u32 *decoded_fmts;
+	int (*decode_run)(struct tegra_ctx *ctx);
+	int (*decode_wait)(struct tegra_ctx *ctx);
 };
 
 struct tegra_vde_soc {
 	bool supports_ref_pic_marking;
+	const struct tegra_coded_fmt_desc *coded_fmts;
+	u32 num_coded_fmts;
 };
 
 struct tegra_vde_bo {
@@ -94,8 +123,60 @@ struct tegra_vde {
 	dma_addr_t bitstream_data_addr;
 	dma_addr_t iram_lists_addr;
 	u32 *iram;
+	struct v4l2_device v4l2_dev;
+	struct v4l2_m2m_dev *m2m;
+	struct media_device mdev;
+	struct video_device vdev;
+	struct mutex v4l2_lock;
+	struct workqueue_struct *wq;
+	struct tegra_video_frame frames[V4L2_H264_NUM_DPB_ENTRIES + 1];
+};
+
+int tegra_vde_alloc_bo(struct tegra_vde *vde,
+		       struct tegra_vde_bo **ret_bo,
+		       enum dma_data_direction dma_dir,
+		       size_t size);
+void tegra_vde_free_bo(struct tegra_vde_bo *bo);
+
+struct tegra_ctx_h264 {
+	const struct v4l2_ctrl_h264_decode_params *decode_params;
+	const struct v4l2_ctrl_h264_sps *sps;
+	const struct v4l2_ctrl_h264_pps *pps;
+};
+
+struct tegra_ctx {
+	struct tegra_vde *vde;
+	struct tegra_ctx_h264 h264;
+	struct work_struct work;
+	struct v4l2_fh fh;
+	struct v4l2_ctrl_handler hdl;
+	struct v4l2_format coded_fmt;
+	struct v4l2_format decoded_fmt;
+	const struct tegra_coded_fmt_desc *coded_fmt_desc;
+	struct v4l2_ctrl *ctrls[];
 };
 
+struct tegra_m2m_buffer {
+	struct v4l2_m2m_buffer m2m;
+	struct dma_buf_attachment *a[VB2_MAX_PLANES];
+	dma_addr_t dma_base[VB2_MAX_PLANES];
+	dma_addr_t dma_addr[VB2_MAX_PLANES];
+	struct iova *iova[VB2_MAX_PLANES];
+	struct tegra_vde_bo *aux;
+	bool b_frame;
+};
+
+static inline struct tegra_m2m_buffer *
+vb_to_tegra_buf(struct vb2_buffer *vb)
+{
+	struct v4l2_m2m_buffer *m2m = container_of(vb, struct v4l2_m2m_buffer,
+						   vb.vb2_buf);
+
+	return container_of(m2m, struct tegra_m2m_buffer, m2m);
+}
+
+void tegra_vde_prepare_control_data(struct tegra_ctx *ctx, u32 id);
+
 void tegra_vde_writel(struct tegra_vde *vde, u32 value, void __iomem *base,
 		      u32 offset);
 u32 tegra_vde_readl(struct tegra_vde *vde, void __iomem *base, u32 offset);
@@ -111,6 +192,8 @@ int tegra_vde_decode_h264(struct tegra_vde *vde,
 			  struct tegra_video_frame *dpb_frames,
 			  dma_addr_t bitstream_data_addr,
 			  size_t bitstream_data_size);
+int tegra_vde_h264_decode_run(struct tegra_ctx *ctx);
+int tegra_vde_h264_decode_wait(struct tegra_ctx *ctx);
 
 int tegra_vde_iommu_init(struct tegra_vde *vde);
 void tegra_vde_iommu_deinit(struct tegra_vde *vde);
@@ -164,4 +247,7 @@ tegra_vde_reg_base_name(struct tegra_vde *vde, void __iomem *base)
 	return "???";
 }
 
+int tegra_vde_v4l2_init(struct tegra_vde *vde);
+void tegra_vde_v4l2_deinit(struct tegra_vde *vde);
+
 #endif /* TEGRA_VDE_H */