[PATCH 3/7] [Media] vcodec: mediatek: Add Mediatek V4L2 Video Decoder Driver

[Tiffany Lin]

Add v4l2 layer decoder driver for MT8173

Signed-off-by: Tiffany Lin <tiffany.lin@xxxxxxxxxxxx>
---
 drivers/media/platform/mtk-vcodec/Makefile         |   10 +-
 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c | 1429 ++++++++++++++++++++
 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h |   81 ++
 .../media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c |  469 +++++++
 .../media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c  |  153 +++
 .../media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h  |   28 +
 drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h |   98 +-
 drivers/media/platform/mtk-vcodec/vdec_drv_base.h  |   56 +
 drivers/media/platform/mtk-vcodec/vdec_drv_if.c    |  113 ++
 drivers/media/platform/mtk-vcodec/vdec_drv_if.h    |   93 ++
 drivers/media/platform/mtk-vcodec/vdec_ipi_msg.h   |   86 ++
 11 files changed, 2596 insertions(+), 20 deletions(-)
 create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c
 create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h
 create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
 create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c
 create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h
 create mode 100644 drivers/media/platform/mtk-vcodec/vdec_drv_base.h
 create mode 100644 drivers/media/platform/mtk-vcodec/vdec_drv_if.c
 create mode 100644 drivers/media/platform/mtk-vcodec/vdec_drv_if.h
 create mode 100644 drivers/media/platform/mtk-vcodec/vdec_ipi_msg.h

diff --git a/drivers/media/platform/mtk-vcodec/Makefile b/drivers/media/platform/mtk-vcodec/Makefile
index dc5cb00..4c8ed2f 100644
--- a/drivers/media/platform/mtk-vcodec/Makefile
+++ b/drivers/media/platform/mtk-vcodec/Makefile
@@ -1,7 +1,13 @@
 
 
-obj-$(CONFIG_VIDEO_MEDIATEK_VCODEC) += mtk-vcodec-enc.o mtk-vcodec-common.o
-
+obj-$(CONFIG_VIDEO_MEDIATEK_VCODEC) += mtk-vcodec-dec.o \
+				       mtk-vcodec-enc.o \
+				       mtk-vcodec-common.o
+
+mtk-vcodec-dec-y := mtk_vcodec_dec_drv.o \
+		vdec_drv_if.o \
+		mtk_vcodec_dec.o \
+		mtk_vcodec_dec_pm.o \
 
 
 mtk-vcodec-enc-y := venc/venc_vp8_if.o \
diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c
new file mode 100644
index 0000000..0499413
--- /dev/null
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c
@@ -0,0 +1,1429 @@
+/*
+* Copyright (c) 2016 MediaTek Inc.
+* Author: PC Chen <pc.chen@xxxxxxxxxxxx>
+*         Tiffany Lin <tiffany.lin@xxxxxxxxxxxx>
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*/
+
+#include <media/v4l2-event.h>
+#include <media/v4l2-mem2mem.h>
+#include <media/videobuf2-dma-contig.h>
+
+#include "mtk_vcodec_drv.h"
+#include "mtk_vcodec_dec.h"
+#include "mtk_vcodec_intr.h"
+#include "mtk_vcodec_util.h"
+#include "vdec_drv_if.h"
+#include "mtk_vcodec_dec_pm.h"
+
+static struct mtk_video_fmt mtk_video_formats[] = {
+	{
+		.fourcc = V4L2_PIX_FMT_H264,
+		.type = MTK_FMT_DEC,
+		.num_planes	= 1,
+	},
+	{
+		.fourcc = V4L2_PIX_FMT_VP8,
+		.type = MTK_FMT_DEC,
+		.num_planes	= 1,
+	},
+	{
+		.fourcc = V4L2_PIX_FMT_VP9,
+		.type = MTK_FMT_DEC,
+		.num_planes	= 1,
+	},
+	{
+		.fourcc = V4L2_PIX_FMT_MT21,
+		.type = MTK_FMT_FRAME,
+		.num_planes = 2,
+	},
+};
+#define OUT_FMT_IDX	0
+#define CAP_FMT_IDX	3
+
+#define VCODEC_CAPABILITY_4K_DISABLED	0x10
+#define VCODEC_DEC_4K_CODED_WIDTH	4096U
+#define VCODEC_DEC_4K_CODED_HEIGHT	2304U
+
+#define MTK_VDEC_MIN_W	64U
+#define MTK_VDEC_MIN_H	64U
+#define MTK_VDEC_MAX_W	2048U
+#define MTK_VDEC_MAX_H	1088U
+#define DFT_CFG_WIDTH	MTK_VDEC_MIN_W
+#define DFT_CFG_HEIGHT	MTK_VDEC_MIN_H
+
+static const struct mtk_codec_framesizes mtk_vdec_framesizes[] = {
+	{
+		.fourcc	= V4L2_PIX_FMT_H264,
+		.stepwise = {  MTK_VDEC_MIN_W, MTK_VDEC_MAX_W, 16,
+					MTK_VDEC_MIN_H, MTK_VDEC_MAX_H, 16 },
+	},
+	{
+		.fourcc	= V4L2_PIX_FMT_VP8,
+		.stepwise = {  MTK_VDEC_MIN_W, MTK_VDEC_MAX_W, 16,
+					MTK_VDEC_MIN_H, MTK_VDEC_MAX_H, 16 },
+	},
+	{
+		.fourcc = V4L2_PIX_FMT_VP9,
+		.stepwise = {  MTK_VDEC_MIN_W, MTK_VDEC_MAX_W, 16,
+					MTK_VDEC_MIN_H, MTK_VDEC_MAX_H, 16 },
+	},
+};
+
+#define NUM_SUPPORTED_FRAMESIZE ARRAY_SIZE(mtk_vdec_framesizes)
+#define NUM_FORMATS ARRAY_SIZE(mtk_video_formats)
+
+
+const struct vb2_ops mtk_vdec_vb2_ops;
+
+static struct mtk_video_fmt *mtk_vdec_find_format(struct v4l2_format *f)
+{
+	struct mtk_video_fmt *fmt;
+	unsigned int k;
+
+	for (k = 0; k < NUM_FORMATS; k++) {
+		fmt = &mtk_video_formats[k];
+		if (fmt->fourcc == f->fmt.pix_mp.pixelformat)
+			return fmt;
+	}
+
+	return NULL;
+}
+
+static struct mtk_q_data *mtk_vdec_get_q_data(struct mtk_vcodec_ctx *ctx,
+					      enum v4l2_buf_type type)
+{
+	if (V4L2_TYPE_IS_OUTPUT(type))
+		return &ctx->q_data[MTK_Q_DATA_SRC];
+
+	return &ctx->q_data[MTK_Q_DATA_DST];
+}
+
+static struct vb2_buffer *get_display_buffer(struct mtk_vcodec_ctx *ctx)
+{
+	struct vdec_fb *disp_frame_buffer;
+	struct vb2_queue *vq;
+	struct mtk_video_buf *dstbuf;
+	struct vdec_fb *frame_buffer;
+
+	mtk_v4l2_debug(3, "[%d]", ctx->idx);
+	if (vdec_if_get_param(ctx,
+				   GET_PARAM_DISP_FRAME_BUFFER,
+				   &disp_frame_buffer)) {
+		mtk_v4l2_err("[%d]Cannot get param : GET_PARAM_DISP_FRAME_BUFFER",
+			     ctx->idx);
+		return NULL;
+	}
+
+	if (disp_frame_buffer == NULL) {
+		mtk_v4l2_debug(3, "No display frame buffer");
+		return NULL;
+	}
+
+	vq = v4l2_m2m_get_vq(ctx->m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
+	if (!vq) {
+		mtk_v4l2_err("Cannot find V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE queue!");
+		return NULL;
+	}
+
+	frame_buffer = disp_frame_buffer;
+	dstbuf = container_of(frame_buffer, struct mtk_video_buf, frame_buffer);
+	mutex_lock(&dstbuf->lock);
+	if (dstbuf->used) {
+		vb2_set_plane_payload(&dstbuf->vb.vb2_buf, 0,
+							ctx->picinfo.y_bs_sz);
+		vb2_set_plane_payload(&dstbuf->vb.vb2_buf, 1,
+							ctx->picinfo.c_bs_sz);
+
+		dstbuf->ready_to_display = true;
+		dstbuf->nonrealdisplay = false;
+		mtk_v4l2_debug(2,
+			       "[%d]status=%x queue idx=%d to done_list %d",
+			       ctx->idx, frame_buffer->status,
+			       dstbuf->vb.vb2_buf.index,
+			       dstbuf->queued_in_vb2);
+
+		v4l2_m2m_buf_done(&dstbuf->vb, VB2_BUF_STATE_DONE);
+		ctx->decoded_frame_cnt++;
+	}
+	mutex_unlock(&dstbuf->lock);
+	return &dstbuf->vb.vb2_buf;
+}
+
+static struct vb2_buffer *get_free_buffer(struct mtk_vcodec_ctx *ctx)
+{
+	void *tmp_frame_addr;
+	struct vb2_queue *vq;
+	struct mtk_video_buf *dstbuf;
+	struct vdec_fb *frame_buffer;
+
+	if (vdec_if_get_param(ctx,
+				   GET_PARAM_FREE_FRAME_BUFFER,
+				   &tmp_frame_addr)) {
+		mtk_v4l2_err("[%d] Error!! Cannot get param", ctx->idx);
+		return NULL;
+	}
+	if (tmp_frame_addr == NULL) {
+		mtk_v4l2_debug(3, " No free frame buffer");
+		return NULL;
+	}
+
+	mtk_v4l2_debug(3, "[%d] tmp_frame_addr = 0x%p",
+			 ctx->idx, tmp_frame_addr);
+
+	vq = v4l2_m2m_get_vq(ctx->m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
+	if (!vq) {
+		mtk_v4l2_err("Cannot find V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE queue!");
+		return NULL;
+	}
+
+	frame_buffer = tmp_frame_addr;
+	dstbuf = container_of(frame_buffer, struct mtk_video_buf, frame_buffer);
+
+	mutex_lock(&dstbuf->lock);
+	if (dstbuf->used) {
+		if ((dstbuf->queued_in_vb2) &&
+		    (dstbuf->queued_in_v4l2) &&
+		    (frame_buffer->status == FB_ST_FREE)) {
+			mtk_v4l2_debug(2,
+				"[%d]status=%x queue idx=%d to rdy_queue %d",
+				 ctx->idx, frame_buffer->status,
+				 dstbuf->vb.vb2_buf.index,
+				 dstbuf->queued_in_vb2);
+			v4l2_m2m_buf_queue(ctx->m2m_ctx, &dstbuf->vb);
+		} else if ((dstbuf->queued_in_vb2 == false) &&
+			   (dstbuf->queued_in_v4l2 == true)) {
+			mtk_v4l2_debug(2,
+					 "[%d]status=%x queue idx=%d to rdy_queue",
+					 ctx->idx, frame_buffer->status,
+					 dstbuf->vb.vb2_buf.index);
+			v4l2_m2m_buf_queue(ctx->m2m_ctx, &dstbuf->vb);
+			dstbuf->queued_in_vb2 = true;
+		} else {
+			mtk_v4l2_debug(2,
+					"[%d]status=%x err queue idx=%d %d %d",
+					ctx->idx, frame_buffer->status,
+					dstbuf->vb.vb2_buf.index,
+					dstbuf->queued_in_vb2,
+					dstbuf->queued_in_v4l2);
+		}
+		dstbuf->used = false;
+	}
+	mutex_unlock(&dstbuf->lock);
+	return &dstbuf->vb.vb2_buf;
+}
+
+static void clean_display_buffer(struct mtk_vcodec_ctx *ctx)
+{
+	struct vb2_buffer *framptr;
+
+	do {
+		framptr = get_display_buffer(ctx);
+	} while (framptr);
+}
+
+static void clean_free_buffer(struct mtk_vcodec_ctx *ctx)
+{
+	struct vb2_buffer *framptr;
+
+	do {
+		framptr = get_free_buffer(ctx);
+	} while (framptr);
+}
+
+static int mtk_vdec_queue_res_chg_event(struct mtk_vcodec_ctx *ctx)
+{
+	static const struct v4l2_event ev_src_ch = {
+		.type = V4L2_EVENT_SOURCE_CHANGE,
+		.u.src_change.changes =
+		V4L2_EVENT_SRC_CH_RESOLUTION,
+	};
+
+	mtk_v4l2_debug(1, "[%d]", ctx->idx);
+	v4l2_event_queue_fh(&ctx->fh, &ev_src_ch);
+
+	return 0;
+}
+
+static void mtk_vdec_flush_decoder(struct mtk_vcodec_ctx *ctx)
+{
+	bool res_chg;
+	int ret = 0;
+
+	ret = vdec_if_decode(ctx, NULL, NULL, &res_chg);
+	if (ret)
+		mtk_v4l2_err("DecodeFinal failed");
+
+	clean_display_buffer(ctx);
+	clean_free_buffer(ctx);
+}
+
+static bool mtk_vdec_pic_info_update(struct mtk_vcodec_ctx *ctx)
+{
+	int dpbsize;
+
+	if (vdec_if_get_param(ctx,
+				   GET_PARAM_PIC_INFO,
+				   &ctx->last_decoded_picinfo)) {
+		mtk_v4l2_err("[%d]Error!! Cannot get param : GET_PARAM_PICTURE_INFO ERR",
+				ctx->idx);
+		return false;
+	}
+
+	if (ctx->last_decoded_picinfo.pic_w == 0 ||
+		ctx->last_decoded_picinfo.pic_h == 0 ||
+		ctx->last_decoded_picinfo.buf_w == 0 ||
+		ctx->last_decoded_picinfo.buf_h == 0)
+		return false;
+
+	if ((ctx->last_decoded_picinfo.pic_w != ctx->picinfo.pic_w) ||
+	    (ctx->last_decoded_picinfo.pic_h != ctx->picinfo.pic_h)) {
+
+		mtk_v4l2_debug(1,
+				"[%d]-> new(%d,%d), old(%d,%d), real(%d,%d)",
+				 ctx->idx, ctx->last_decoded_picinfo.pic_w,
+				 ctx->last_decoded_picinfo.pic_h,
+				 ctx->picinfo.pic_w, ctx->picinfo.pic_h,
+				 ctx->last_decoded_picinfo.buf_w,
+				 ctx->last_decoded_picinfo.buf_h);
+
+		vdec_if_get_param(ctx, GET_PARAM_DPB_SIZE, &dpbsize);
+		if (dpbsize == 0)
+			dpbsize = 1;
+		ctx->dpb_count = dpbsize;
+		return true;
+	}
+
+	return false;
+}
+
+void mtk_vdec_worker(struct work_struct *work)
+{
+	struct mtk_vcodec_ctx *ctx = container_of(work, struct mtk_vcodec_ctx,
+				    decode_work);
+	struct mtk_vcodec_dev *dev = ctx->dev;
+	struct vb2_buffer *src_buf, *dst_buf;
+	struct mtk_vcodec_mem buf;
+	struct vdec_fb *pfb;
+	bool res_chg = false;
+	int ret;
+	struct mtk_video_buf *dst_buf_info, *src_buf_info;
+	struct vb2_v4l2_buffer *dst_vb2_v4l2, *src_vb2_v4l2;
+
+	src_buf = v4l2_m2m_next_src_buf(ctx->m2m_ctx);
+	if (src_buf == NULL) {
+		v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
+		mtk_v4l2_debug(1, "[%d] src_buf empty!!", ctx->idx);
+		return;
+	}
+
+	dst_buf = v4l2_m2m_next_dst_buf(ctx->m2m_ctx);
+	if (dst_buf == NULL) {
+		v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
+		mtk_v4l2_debug(1, "[%d] dst_buf empty!!", ctx->idx);
+		return;
+	}
+
+	src_vb2_v4l2 = container_of(src_buf, struct vb2_v4l2_buffer, vb2_buf);
+	src_buf_info = container_of(src_vb2_v4l2, struct mtk_video_buf, vb);
+
+	dst_vb2_v4l2 = container_of(dst_buf, struct vb2_v4l2_buffer, vb2_buf);
+	dst_buf_info = container_of(dst_vb2_v4l2, struct mtk_video_buf, vb);
+
+	buf.va = vb2_plane_vaddr(src_buf, 0);
+	buf.dma_addr = vb2_dma_contig_plane_dma_addr(src_buf, 0);
+	buf.size = (unsigned int)src_buf->planes[0].bytesused;
+	if (!buf.va) {
+		v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
+		mtk_v4l2_err("[%d] idx=%d src_addr is NULL!!",
+			       ctx->idx, src_buf->index);
+		return;
+	}
+
+	pfb = &dst_buf_info->frame_buffer;
+	pfb->base_y.va = vb2_plane_vaddr(dst_buf, 0);
+	pfb->base_y.dma_addr = vb2_dma_contig_plane_dma_addr(dst_buf, 0);
+	pfb->base_y.size = ctx->picinfo.y_bs_sz + ctx->picinfo.y_len_sz;
+
+	pfb->base_c.va = vb2_plane_vaddr(dst_buf, 1);
+	pfb->base_c.dma_addr = vb2_dma_contig_plane_dma_addr(dst_buf, 1);
+	pfb->base_c.size = ctx->picinfo.c_bs_sz + ctx->picinfo.c_len_sz;
+	pfb->status = 0;
+	mtk_v4l2_debug(3, "===>[%d] vdec_if_decode() ===>", ctx->idx);
+	mtk_v4l2_debug(3,
+			 "[%d] Bitstream VA=%p DMA=%llx Size=0x%lx vb=%p",
+			 ctx->idx, buf.va,
+			 (u64)buf.dma_addr,
+			 buf.size, src_buf);
+
+	mtk_v4l2_debug(3,
+			"idx=%d Framebuf  pfb=%p VA=%p Y_DMA=%llx C_DMA=%llx Size=0x%lx",
+			dst_buf->index, pfb,
+			pfb->base_y.va, (u64)pfb->base_y.dma_addr,
+			(u64)pfb->base_c.dma_addr, pfb->base_y.size);
+
+	if (src_buf_info->lastframe == true) {
+		/* update src buf status */
+		src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
+		src_buf_info->lastframe = false;
+		v4l2_m2m_buf_done(&src_buf_info->vb, VB2_BUF_STATE_DONE);
+
+		/* update dst buf status */
+		dst_buf = v4l2_m2m_dst_buf_remove(ctx->m2m_ctx);
+		dst_buf_info->used = false;
+
+		clean_display_buffer(ctx);
+		vb2_set_plane_payload(&dst_buf_info->vb.vb2_buf, 0, 0);
+		vb2_set_plane_payload(&dst_buf_info->vb.vb2_buf, 1, 0);
+		v4l2_m2m_buf_done(&dst_buf_info->vb, VB2_BUF_STATE_DONE);
+		clean_free_buffer(ctx);
+	} else {
+
+		dst_buf_info->vb.timestamp
+					= src_buf_info->vb.timestamp;
+		dst_buf_info->vb.timecode
+					= src_buf_info->vb.timecode;
+		mutex_lock(&dst_buf_info->lock);
+		dst_buf_info->used = true;
+		mutex_unlock(&dst_buf_info->lock);
+		src_buf_info->used = true;
+
+		ret = vdec_if_decode(ctx, &buf, pfb, &res_chg);
+
+		if (ret) {
+			mtk_v4l2_err(
+				" <===[%d], src_buf[%d]%d sz=0x%zx pts=(%lu %lu) dst_buf[%d] vdec_if_decode() ret=%d res_chg=%d===>",
+				ctx->idx,
+				src_buf->index,
+				src_buf_info->lastframe,
+				buf.size,
+				src_buf_info->vb.timestamp.tv_sec,
+				src_buf_info->vb.timestamp.tv_usec,
+				dst_buf->index,
+				ret, res_chg);
+			src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
+			v4l2_m2m_buf_done(&src_buf_info->vb,
+					VB2_BUF_STATE_ERROR);
+		} else if (res_chg == false) {
+			/* we only return src buffer with VB2_BUF_STATE_DONE
+			  * when decode success without resolution change
+			  */
+			src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
+			v4l2_m2m_buf_done(&src_buf_info->vb,
+							VB2_BUF_STATE_DONE);
+		}
+
+		dst_buf = v4l2_m2m_dst_buf_remove(ctx->m2m_ctx);
+		clean_display_buffer(ctx);
+		clean_free_buffer(ctx);
+
+		if ((ret == 0) && (res_chg == true)) {
+			mtk_vdec_pic_info_update(ctx);
+			/*
+			  * On encountering a resolution change in the stream.
+			  * The driver must first process and decode all
+			  * remaining buffers from before the resolution change
+			  * point, so call flush decode here
+			  */
+			mtk_vdec_flush_decoder(ctx);
+			/*
+			  * After all buffers containing decoded frames from
+			  * before the resolution change point ready to be
+			  * dequeued on the CAPTURE queue, the driver sends a
+			  * V4L2_EVENT_SOURCE_CHANGE event for source change
+			  * type V4L2_EVENT_SRC_CH_RESOLUTION
+			  */
+			mtk_vdec_queue_res_chg_event(ctx);
+		}
+	}
+
+	v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
+
+}
+
+int mtk_vdec_unlock(struct mtk_vcodec_ctx *ctx)
+{
+	mutex_unlock(&ctx->dev->dec_mutex);
+	return 0;
+}
+
+int mtk_vdec_lock(struct mtk_vcodec_ctx *ctx)
+{
+	mutex_lock(&ctx->dev->dec_mutex);
+	return 0;
+}
+
+int m2mctx_vdec_queue_init(void *priv, struct vb2_queue *src_vq,
+			   struct vb2_queue *dst_vq)
+{
+	struct mtk_vcodec_ctx *ctx = priv;
+	int ret = 0;
+
+	mtk_v4l2_debug(3, "[%d]", ctx->idx);
+
+	src_vq->type		= V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
+	src_vq->io_modes	= VB2_DMABUF | VB2_MMAP;
+	src_vq->drv_priv	= ctx;
+	src_vq->buf_struct_size = sizeof(struct mtk_video_buf);
+	src_vq->ops		= &mtk_vdec_vb2_ops;
+	src_vq->mem_ops		= &vb2_dma_contig_memops;
+	src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
+	src_vq->lock = &ctx->dev->dev_mutex;
+
+	ret = vb2_queue_init(src_vq);
+	if (ret) {
+		mtk_v4l2_err("Failed to initialize videobuf2 queue(output)");
+		return ret;
+	}
+	dst_vq->type		= V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
+	dst_vq->io_modes	= VB2_DMABUF | VB2_MMAP;
+	dst_vq->drv_priv	= ctx;
+	dst_vq->buf_struct_size = sizeof(struct mtk_video_buf);
+	dst_vq->ops		= &mtk_vdec_vb2_ops;
+	dst_vq->mem_ops		= &vb2_dma_contig_memops;
+	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
+	dst_vq->lock = &ctx->dev->dev_mutex;
+
+	ret = vb2_queue_init(dst_vq);
+	if (ret) {
+		vb2_queue_release(src_vq);
+		mtk_v4l2_err("Failed to initialize videobuf2 queue(capture)");
+	}
+
+	return ret;
+}
+
+void mtk_vcodec_vdec_release(struct mtk_vcodec_ctx *ctx)
+{
+	vdec_if_deinit(ctx);
+	ctx->state = MTK_STATE_FREE;
+}
+
+void mtk_vcodec_dec_set_default_params(struct mtk_vcodec_ctx *ctx)
+{
+	struct mtk_q_data *q_data;
+
+	ctx->m2m_ctx->q_lock = &ctx->dev->dev_mutex;
+	ctx->fh.m2m_ctx = ctx->m2m_ctx;
+	ctx->fh.ctrl_handler = &ctx->ctrl_hdl;
+	INIT_WORK(&ctx->decode_work, mtk_vdec_worker);
+
+	q_data = &ctx->q_data[MTK_Q_DATA_SRC];
+	memset(q_data, 0, sizeof(struct mtk_q_data));
+	q_data->visible_width = DFT_CFG_WIDTH;
+	q_data->visible_height = DFT_CFG_HEIGHT;
+	q_data->fmt = &mtk_video_formats[OUT_FMT_IDX];
+	q_data->colorspace = V4L2_COLORSPACE_REC709;
+	q_data->field = V4L2_FIELD_NONE;
+	ctx->q_data[MTK_Q_DATA_DST].sizeimage[0] =
+		DFT_CFG_WIDTH * DFT_CFG_HEIGHT;
+	ctx->q_data[MTK_Q_DATA_DST].bytesperline[0] = 0;
+
+
+	q_data = &ctx->q_data[MTK_Q_DATA_DST];
+	memset(q_data, 0, sizeof(struct mtk_q_data));
+	q_data->visible_width = DFT_CFG_WIDTH;
+	q_data->visible_height = DFT_CFG_HEIGHT;
+	q_data->coded_width = DFT_CFG_WIDTH;
+	q_data->coded_height = DFT_CFG_HEIGHT;
+	q_data->colorspace = V4L2_COLORSPACE_REC709;
+	q_data->field = V4L2_FIELD_NONE;
+
+	q_data->fmt = &mtk_video_formats[CAP_FMT_IDX];
+
+	v4l_bound_align_image(&q_data->coded_width,
+					MTK_VDEC_MIN_W,
+					MTK_VDEC_MAX_W, 4,
+					&q_data->coded_height,
+					MTK_VDEC_MIN_H,
+					MTK_VDEC_MAX_H, 5, 6);
+
+	q_data->sizeimage[0] = q_data->coded_width * q_data->coded_height;
+	q_data->bytesperline[0] = q_data->coded_width;
+	q_data->sizeimage[1] = q_data->sizeimage[0] / 2;
+	q_data->bytesperline[1] = q_data->coded_width;
+
+}
+
+static int vidioc_vdec_streamon(struct file *file, void *priv,
+				enum v4l2_buf_type type)
+{
+	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
+
+	mtk_v4l2_debug(3, "[%d] (%d)", ctx->idx, type);
+
+	return v4l2_m2m_streamon(file, ctx->m2m_ctx, type);
+}
+
+static int vidioc_vdec_streamoff(struct file *file, void *priv,
+				 enum v4l2_buf_type type)
+{
+	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
+
+	mtk_v4l2_debug(3, "[%d] (%d)", ctx->idx, type);
+	return v4l2_m2m_streamoff(file, ctx->m2m_ctx, type);
+}
+
+static int vidioc_vdec_reqbufs(struct file *file, void *priv,
+			       struct v4l2_requestbuffers *reqbufs)
+{
+	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
+	int ret;
+
+	mtk_v4l2_debug(3, "[%d] (%d) count=%d", ctx->idx,
+			 reqbufs->type, reqbufs->count);
+	ret = v4l2_m2m_reqbufs(file, ctx->m2m_ctx, reqbufs);
+
+	return ret;
+}
+
+static int vidioc_vdec_querybuf(struct file *file, void *priv,
+				struct v4l2_buffer *buf)
+{
+	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
+
+	mtk_v4l2_debug(3, "[%d] (%d) id=%d", ctx->idx,
+			 buf->type, buf->index);
+	return v4l2_m2m_querybuf(file, ctx->m2m_ctx, buf);
+}
+
+static int vidioc_vdec_qbuf(struct file *file, void *priv,
+			    struct v4l2_buffer *buf)
+{
+	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
+	struct vb2_queue *vq;
+	struct vb2_buffer *vb;
+	struct mtk_video_buf *mtkbuf;
+	struct vb2_v4l2_buffer	*vb2_v4l2;
+
+	if (ctx->state == MTK_STATE_ABORT) {
+		mtk_v4l2_err("[%d] Call on QBUF after unrecoverable error",
+					ctx->idx);
+		return -EIO;
+	}
+
+	vq = v4l2_m2m_get_vq(ctx->m2m_ctx, buf->type);
+	vb = vq->bufs[buf->index];
+	vb2_v4l2 = container_of(vb, struct vb2_v4l2_buffer, vb2_buf);
+	mtkbuf = container_of(vb2_v4l2, struct mtk_video_buf, vb);
+
+	if ((buf->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) &&
+	    (buf->m.planes[0].bytesused == 0)) {
+		mtkbuf->lastframe = true;
+		mtk_v4l2_debug(1, "[%d] (%d) id=%d lastframe=%d (%d,%d, %d) vb=%p",
+			 ctx->idx, buf->type, buf->index,
+			 mtkbuf->lastframe, buf->bytesused,
+			 buf->m.planes[0].bytesused, buf->length,
+			 vb);
+	}
+
+	return v4l2_m2m_qbuf(file, ctx->m2m_ctx, buf);
+}
+
+static int vidioc_vdec_dqbuf(struct file *file, void *priv,
+			     struct v4l2_buffer *buf)
+{
+	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
+
+	if (ctx->state == MTK_STATE_ABORT) {
+		mtk_v4l2_err("[%d] Call on QBUF after unrecoverable error",
+					ctx->idx);
+		return -EIO;
+	}
+
+	return v4l2_m2m_dqbuf(file, ctx->m2m_ctx, buf);
+}
+
+static int vidioc_vdec_expbuf(struct file *file, void *priv,
+			      struct v4l2_exportbuffer *eb)
+{
+	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
+
+	return v4l2_m2m_expbuf(file, ctx->m2m_ctx, eb);
+}
+
+static int vidioc_vdec_querycap(struct file *file, void *priv,
+				struct v4l2_capability *cap)
+{
+	strlcpy(cap->driver, MTK_VCODEC_DEC_NAME, sizeof(cap->driver));
+	strlcpy(cap->bus_info, MTK_PLATFORM_STR, sizeof(cap->bus_info));
+	strlcpy(cap->card, MTK_PLATFORM_STR, sizeof(cap->card));
+	cap->device_caps  = V4L2_CAP_VIDEO_M2M_MPLANE | V4L2_CAP_STREAMING;
+	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
+
+	return 0;
+}
+
+static int vidioc_vdec_unsubscribe_evt(struct v4l2_fh *fh,
+				     const struct v4l2_event_subscription *sub)
+{
+	switch (sub->type) {
+	case V4L2_EVENT_EOS:
+	case V4L2_EVENT_SOURCE_CHANGE:
+		return v4l2_event_unsubscribe(fh, sub);
+	default:
+		return -EINVAL;
+	}
+}
+
+static int vidioc_vdec_subscribe_evt(struct v4l2_fh *fh,
+				     const struct v4l2_event_subscription *sub)
+{
+	switch (sub->type) {
+	case V4L2_EVENT_EOS:
+		return v4l2_event_subscribe(fh, sub, 2, NULL);
+	case V4L2_EVENT_SOURCE_CHANGE:
+		return v4l2_src_change_event_subscribe(fh, sub);
+	default:
+		return -EINVAL;
+	}
+}
+
+static int vidioc_try_fmt_vid_cap_mplane(struct file *file, void *priv,
+				struct v4l2_format *f)
+{
+	struct mtk_video_fmt *fmt;
+
+	fmt = mtk_vdec_find_format(f);
+	if (!fmt) {
+		f->fmt.pix.pixelformat = mtk_video_formats[CAP_FMT_IDX].fourcc;
+		fmt = mtk_vdec_find_format(f);
+	}
+
+	return 0;
+}
+
+static int vidioc_try_fmt_vid_out_mplane(struct file *file, void *priv,
+				struct v4l2_format *f)
+{
+	struct v4l2_pix_format_mplane *pix_fmt_mp = &f->fmt.pix_mp;
+	struct mtk_video_fmt *fmt;
+
+	fmt = mtk_vdec_find_format(f);
+	if (!fmt) {
+		f->fmt.pix.pixelformat = mtk_video_formats[OUT_FMT_IDX].fourcc;
+		fmt = mtk_vdec_find_format(f);
+	}
+
+	if (pix_fmt_mp->plane_fmt[0].sizeimage == 0) {
+		mtk_v4l2_err("sizeimage of output format must be given");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int vidioc_vdec_g_crop(struct file *file, void *priv,
+			 struct v4l2_crop *cr)
+{
+	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
+
+	if (ctx->state < MTK_STATE_HEADER)
+		return -EINVAL;
+
+	if ((ctx->q_data[MTK_Q_DATA_SRC].fmt->fourcc == V4L2_PIX_FMT_H264) ||
+	    (ctx->q_data[MTK_Q_DATA_SRC].fmt->fourcc == V4L2_PIX_FMT_VP8) ||
+	    (ctx->q_data[MTK_Q_DATA_SRC].fmt->fourcc == V4L2_PIX_FMT_VP9)) {
+
+		if (vdec_if_get_param(ctx,
+					   GET_PARAM_CROP_INFO,
+					   cr)) {
+			mtk_v4l2_debug(2,
+					 "[%d]Error!! Cannot get param : GET_PARAM_CROP_INFO ERR",
+					 ctx->idx);
+			cr->c.left = 0;
+			cr->c.top = 0;
+			cr->c.width = ctx->picinfo.buf_w;
+			cr->c.height = ctx->picinfo.buf_h;
+		}
+		mtk_v4l2_debug(2, "Cropping info: l=%d t=%d w=%d h=%d",
+				 cr->c.left, cr->c.top, cr->c.width,
+				 cr->c.height);
+	} else {
+		cr->c.left = 0;
+		cr->c.top = 0;
+		cr->c.width = ctx->picinfo.pic_w;
+		cr->c.height = ctx->picinfo.pic_h;
+		mtk_v4l2_debug(2, "Cropping info: w=%d h=%d fw=%d fh=%d",
+				 cr->c.width, cr->c.height, ctx->picinfo.buf_w,
+				 ctx->picinfo.buf_h);
+	}
+	return 0;
+}
+
+static int vidioc_vdec_s_fmt(struct file *file, void *priv,
+			     struct v4l2_format *f)
+{
+	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
+	struct v4l2_pix_format_mplane *pix_mp;
+	struct vb2_queue *vq;
+	struct mtk_q_data *q_data;
+	int ret;
+	struct mtk_video_fmt *fmt;
+
+	mtk_v4l2_debug(3, "[%d]", ctx->idx);
+
+	fmt = mtk_vdec_find_format(f);
+	if (fmt == NULL) {
+		mtk_v4l2_err("mtk_venc_find_format fail");
+		return ret;
+	}
+
+	pix_mp = &f->fmt.pix_mp;
+	if ((f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) &&
+	    vb2_is_busy(&ctx->m2m_ctx->out_q_ctx.q)) {
+		mtk_v4l2_err("out_q_ctx buffers already requested");
+		ret = -EBUSY;
+	}
+
+	if ((f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) &&
+	    vb2_is_busy(&ctx->m2m_ctx->cap_q_ctx.q)) {
+		mtk_v4l2_err("cap_q_ctx buffers already requested");
+		ret = -EBUSY;
+	}
+
+	vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type);
+	if (!vq)
+		return -EINVAL;
+
+	q_data = mtk_vdec_get_q_data(ctx, f->type);
+	if (!q_data)
+		return -EINVAL;
+
+	if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
+		q_data->fmt = fmt;
+		q_data->sizeimage[0] = pix_mp->plane_fmt[0].sizeimage;
+		pix_mp->plane_fmt[0].bytesperline = 0;
+		pix_mp->width = 0;
+		pix_mp->height = 0;
+
+		if (ctx->state == MTK_STATE_FREE) {
+			ret = vdec_if_init(ctx, q_data->fmt->fourcc);
+			if (ret) {
+				mtk_v4l2_err("[%d]: vdec_if_init() fail ret=%d",
+					       ctx->idx, ret);
+				return -EINVAL;
+			}
+			ctx->state = MTK_STATE_INIT;
+		}
+	} else {
+		q_data->fmt = fmt;
+	}
+
+	return 0;
+}
+
+static int vidioc_enum_framesizes(struct file *file, void *priv,
+				struct v4l2_frmsizeenum *fsize)
+{
+	int i = 0;
+	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
+
+	if (fsize->index != 0)
+		return -EINVAL;
+
+	for (i = 0; i < NUM_SUPPORTED_FRAMESIZE; ++i) {
+		if (fsize->pixel_format != mtk_vdec_framesizes[i].fourcc)
+			continue;
+
+		fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
+		fsize->stepwise = mtk_vdec_framesizes[i].stepwise;
+		if (!(ctx->dev->dec_capability &
+				VCODEC_CAPABILITY_4K_DISABLED)) {
+			mtk_v4l2_debug(1, "4K is enabled");
+			fsize->stepwise.max_width =
+					VCODEC_DEC_4K_CODED_WIDTH;
+			fsize->stepwise.max_height =
+					VCODEC_DEC_4K_CODED_HEIGHT;
+		}
+		mtk_v4l2_debug(1, "%x, %d %d %d %d %d %d",
+					ctx->dev->dec_capability,
+					fsize->stepwise.min_width,
+					fsize->stepwise.max_width,
+					fsize->stepwise.step_width,
+					fsize->stepwise.min_height,
+					fsize->stepwise.max_height,
+					fsize->stepwise.step_height);
+		return 0;
+	}
+
+	return -EINVAL;
+
+}
+
+static int vidioc_enum_fmt(struct v4l2_fmtdesc *f, bool output_queue)
+{
+	struct mtk_video_fmt *fmt;
+	int i, j = 0;
+
+	for (i = 0; i < NUM_FORMATS; i++) {
+		if (output_queue && (mtk_video_formats[i].type != MTK_FMT_DEC))
+			continue;
+		if (!output_queue &&
+			(mtk_video_formats[i].type != MTK_FMT_FRAME))
+			continue;
+
+		if (j == f->index)
+			break;
+		++j;
+	}
+
+	if (i == NUM_FORMATS)
+		return -EINVAL;
+
+	fmt = &mtk_video_formats[i];
+	f->pixelformat = fmt->fourcc;
+	f->flags = 0;
+	memset(f->reserved, 0, sizeof(f->reserved));
+
+	if (mtk_video_formats[i].type != MTK_FMT_DEC)
+		f->flags |= V4L2_FMT_FLAG_COMPRESSED;
+
+	return 0;
+}
+
+static int vidioc_vdec_enum_fmt_vid_cap_mplane(struct file *file, void *pirv,
+					       struct v4l2_fmtdesc *f)
+{
+	return vidioc_enum_fmt(f, false);
+}
+
+static int vidioc_vdec_enum_fmt_vid_out_mplane(struct file *file, void *priv,
+					       struct v4l2_fmtdesc *f)
+{
+	return vidioc_enum_fmt(f, true);
+}
+
+static int vidioc_vdec_g_fmt(struct file *file, void *priv,
+			     struct v4l2_format *f)
+{
+	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
+	struct v4l2_pix_format_mplane *pix_mp = &f->fmt.pix_mp;
+	struct vb2_queue *vq;
+	struct mtk_q_data *q_data;
+
+	vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type);
+	if (!vq) {
+		mtk_v4l2_err("no vb2 queue for type=%d",
+					   f->type);
+		return -EINVAL;
+	}
+
+	q_data = mtk_vdec_get_q_data(ctx, f->type);
+
+	if ((f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) &&
+	    (ctx->state >= MTK_STATE_HEADER)) {
+		/* previous decode might have resolution change that make
+		 * picinfo changed update context'x picinfo here to make sure
+		 * we know what report to user space
+		 */
+		memcpy(&ctx->picinfo, &ctx->last_decoded_picinfo,
+			sizeof(struct vdec_pic_info));
+		q_data->sizeimage[0] = ctx->picinfo.y_bs_sz +
+					ctx->picinfo.y_len_sz;
+		q_data->sizeimage[1] = ctx->picinfo.c_bs_sz +
+					ctx->picinfo.c_len_sz;
+		q_data->bytesperline[0] = ctx->last_decoded_picinfo.buf_w;
+		q_data->bytesperline[1] = ctx->last_decoded_picinfo.buf_w;
+		q_data->coded_width = ctx->picinfo.buf_w;
+		q_data->coded_height = ctx->picinfo.buf_h;
+
+		/*
+		 * Width and height are set to the dimensions
+		 * of the movie, the buffer is bigger and
+		 * further processing stages should crop to this
+		 * rectangle.
+		 */
+		pix_mp->width = q_data->coded_width;
+		pix_mp->height = q_data->coded_height;
+		pix_mp->field = V4L2_FIELD_NONE;
+
+		/*
+		 * Set pixelformat to the format in which mt vcodec
+		 * outputs the decoded frame
+		 */
+		pix_mp->num_planes = q_data->fmt->num_planes;
+		pix_mp->pixelformat = q_data->fmt->fourcc;
+		pix_mp->plane_fmt[0].bytesperline = q_data->bytesperline[0];
+		pix_mp->plane_fmt[0].sizeimage = q_data->sizeimage[0];
+		pix_mp->plane_fmt[1].bytesperline = q_data->bytesperline[1];
+		pix_mp->plane_fmt[1].sizeimage = q_data->sizeimage[1];
+
+	} else if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
+		/*
+		 * This is run on OUTPUT
+		 * The buffer contains compressed image
+		 * so width and height have no meaning.
+		 * Assign value here to pass v4l2-compliance test
+		 */
+		pix_mp->width = q_data->visible_width;
+		pix_mp->height = q_data->visible_height;
+		pix_mp->field = V4L2_FIELD_NONE;
+		pix_mp->plane_fmt[0].bytesperline = q_data->bytesperline[0];
+		pix_mp->plane_fmt[0].sizeimage = q_data->sizeimage[0];
+		pix_mp->pixelformat = q_data->fmt->fourcc;
+		pix_mp->num_planes = q_data->fmt->num_planes;
+	} else {
+		pix_mp->width = q_data->coded_width;
+		pix_mp->height = q_data->coded_height;
+		pix_mp->field = V4L2_FIELD_NONE;
+		pix_mp->num_planes = q_data->fmt->num_planes;
+		pix_mp->pixelformat = q_data->fmt->fourcc;
+		pix_mp->plane_fmt[0].bytesperline = q_data->bytesperline[0];
+		pix_mp->plane_fmt[0].sizeimage = q_data->sizeimage[0];
+		pix_mp->plane_fmt[1].bytesperline = q_data->bytesperline[1];
+		pix_mp->plane_fmt[1].sizeimage = q_data->sizeimage[1];
+
+		mtk_v4l2_debug(1, "[%d] state=%d Format could not be read %d, not ready yet!",
+				ctx->idx, ctx->state, f->type);
+		return -EAGAIN;
+	}
+
+	return 0;
+}
+
+static int vb2ops_vdec_queue_setup(struct vb2_queue *vq,
+				   const void *parg,
+				   unsigned int *nbuffers,
+				   unsigned int *nplanes,
+				   unsigned int sizes[], void *alloc_ctxs[])
+{
+	struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(vq);
+	struct mtk_q_data *q_data;
+
+	q_data = mtk_vdec_get_q_data(ctx, vq->type);
+
+	switch (vq->type) {
+	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
+		*nplanes = 1;
+
+		sizes[0] = q_data->sizeimage[0];
+		alloc_ctxs[0] = ctx->dev->alloc_ctx;
+		break;
+	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
+		if (ctx->state < MTK_STATE_HEADER)
+			return -EINVAL;
+
+		/*
+		 * Output plane count is 2 - one for Y and one for CbCr
+		 */
+		*nplanes = 2;
+
+		mtk_v4l2_debug(1,
+				"[%d]\t get %d plane(s), ctx->dpb_count = %d, %d buffer(s)",
+				ctx->idx, *nplanes, ctx->dpb_count, *nbuffers);
+
+		sizes[0] = q_data->sizeimage[0];
+		sizes[1] = q_data->sizeimage[1];
+		alloc_ctxs[0] = ctx->dev->alloc_ctx;
+		alloc_ctxs[1] = ctx->dev->alloc_ctx;
+		break;
+	default:
+		break;
+	}
+
+	mtk_v4l2_debug(1,
+			"[%d]\t type = %d, get %d plane(s), %d buffer(s) of size 0x%x 0x%x ",
+			ctx->idx, vq->type, *nplanes, *nbuffers,
+			sizes[0], sizes[1]);
+
+	return 0;
+}
+
+static int vb2ops_vdec_buf_prepare(struct vb2_buffer *vb)
+{
+	struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
+	struct mtk_q_data *q_data;
+	int i;
+
+	mtk_v4l2_debug(3, "[%d] (%d) id=%d",
+			 ctx->idx, vb->vb2_queue->type, vb->index);
+
+	q_data = mtk_vdec_get_q_data(ctx, vb->vb2_queue->type);
+
+	for (i = 0; i < q_data->fmt->num_planes; i++) {
+		if (vb2_plane_size(vb, i) > q_data->sizeimage[i]) {
+			mtk_v4l2_err("data will not fit into plane %d (%lu < %d)",
+				       i, vb2_plane_size(vb, i),
+				       q_data->sizeimage[i]);
+		}
+	}
+
+	return 0;
+}
+
+static void vb2ops_vdec_buf_queue(struct vb2_buffer *vb)
+{
+	struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
+	struct vb2_v4l2_buffer *vb2_v4l2 = container_of(vb,
+					struct vb2_v4l2_buffer, vb2_buf);
+	struct mtk_video_buf *buf = container_of(vb2_v4l2,
+					struct mtk_video_buf, vb);
+
+	mtk_v4l2_debug(3, "[%d] (%d) id=%d, vb=%p",
+			ctx->idx, vb->vb2_queue->type,
+			vb->index, vb);
+	/*
+	 * check if this buffer is ready to be used after decode
+	 */
+	if (vb->vb2_queue->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
+		struct vb2_buffer *src_buf;
+		struct mtk_vcodec_mem buf;
+		bool res_chg = false;
+		int ret = 0;
+		int dpbsize = 1;
+
+		v4l2_m2m_buf_queue(ctx->m2m_ctx, vb2_v4l2);
+
+		if (ctx->state == MTK_STATE_INIT) {
+			src_buf = v4l2_m2m_next_src_buf(ctx->m2m_ctx);
+			if (!src_buf) {
+				mtk_v4l2_err("No src buffer");
+				return;
+			}
+
+			buf.va	= vb2_plane_vaddr(src_buf, 0);
+			buf.dma_addr = vb2_dma_contig_plane_dma_addr(
+							src_buf,
+							0);
+			buf.size = (size_t)src_buf->planes[0].bytesused;
+			mtk_v4l2_debug(2,
+					"[%d] buf idx=%d va=%p dma=%llx size=%zu",
+					ctx->idx,
+					src_buf->index,
+					buf.va, (u64)buf.dma_addr, buf.size);
+
+			ret = vdec_if_decode(ctx, &buf, NULL, &res_chg);
+			if (ret) {
+				src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
+				v4l2_m2m_buf_done(to_vb2_v4l2_buffer(src_buf),
+						VB2_BUF_STATE_DONE);
+				mtk_v4l2_err("[%d] vdec_if_decode() src_buf=%d, size=%zu, fail=%d",
+						ctx->idx,
+						src_buf->index,
+						buf.size, ret);
+				return;
+			}
+
+			if (vdec_if_get_param(ctx,
+						   GET_PARAM_PIC_INFO,
+						   &ctx->picinfo)) {
+				mtk_v4l2_err("[%d]Error!! Cannot get param : GET_PARAM_PICTURE_INFO ERR",
+						ctx->idx);
+				return;
+			}
+
+			memcpy(&ctx->last_decoded_picinfo, &ctx->picinfo,
+				sizeof(struct vdec_pic_info));
+			ctx->q_data[MTK_Q_DATA_DST].sizeimage[0] =
+						ctx->picinfo.y_bs_sz +
+						ctx->picinfo.y_len_sz;
+			ctx->q_data[MTK_Q_DATA_DST].bytesperline[0] =
+							ctx->picinfo.buf_w;
+			ctx->q_data[MTK_Q_DATA_DST].sizeimage[1] =
+						ctx->picinfo.c_bs_sz +
+						ctx->picinfo.c_len_sz;
+			ctx->q_data[MTK_Q_DATA_DST].bytesperline[1] =
+							ctx->picinfo.buf_w;
+			mtk_v4l2_debug(2, "[%d] vdec_if_init() OK wxh=%dx%d pic wxh=%dx%d sz[0]=0x%x sz[1]=0x%x",
+				ctx->idx,
+				ctx->picinfo.buf_w, ctx->picinfo.buf_h,
+				ctx->picinfo.pic_w, ctx->picinfo.pic_h,
+				ctx->q_data[MTK_Q_DATA_DST].sizeimage[0],
+				ctx->q_data[MTK_Q_DATA_DST].sizeimage[1]);
+
+			vdec_if_get_param(ctx, GET_PARAM_DPB_SIZE, &dpbsize);
+			if (dpbsize == 0) {
+				mtk_v4l2_debug(2,
+						"[%d] vdec_if_get_param()  GET_PARAM_DPB_SIZE fail=%d",
+						ctx->idx, ret);
+				dpbsize = 1;
+			}
+			ctx->dpb_count = dpbsize;
+			ctx->state = MTK_STATE_HEADER;
+			mtk_v4l2_debug(1, "[%d] dpbsize=%d", ctx->idx,
+							ctx->dpb_count);
+		} else {
+			mtk_v4l2_debug(1, "[%d] already init driver %d",
+					 ctx->idx, ctx->state);
+		}
+
+	} else {
+		mutex_lock(&buf->lock);
+		if (buf->used == false) {
+			v4l2_m2m_buf_queue(ctx->m2m_ctx,
+					to_vb2_v4l2_buffer(vb));
+			buf->queued_in_vb2 = true;
+			buf->queued_in_v4l2 = true;
+			buf->ready_to_display = false;
+		} else {
+			buf->queued_in_vb2 = false;
+			buf->queued_in_v4l2 = true;
+			buf->ready_to_display = false;
+		}
+		mutex_unlock(&buf->lock);
+	}
+}
+
+static void vb2ops_vdec_buf_finish(struct vb2_buffer *vb)
+{
+	if (vb->vb2_queue->type ==
+		V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
+		struct vb2_v4l2_buffer *vb2_v4l2;
+		struct mtk_video_buf *buf;
+
+		vb2_v4l2 = container_of(vb, struct vb2_v4l2_buffer, vb2_buf);
+		buf = container_of(vb2_v4l2, struct mtk_video_buf, vb);
+		mutex_lock(&buf->lock);
+		buf->queued_in_v4l2 = false;
+		buf->queued_in_vb2 = false;
+		mutex_unlock(&buf->lock);
+	}
+}
+
+static int vb2ops_vdec_buf_init(struct vb2_buffer *vb)
+{
+	struct vb2_v4l2_buffer *vb2_v4l2 = container_of(vb,
+					struct vb2_v4l2_buffer, vb2_buf);
+	struct mtk_video_buf *buf = container_of(vb2_v4l2,
+					struct mtk_video_buf, vb);
+
+	if (vb->vb2_queue->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
+		buf->used = false;
+		buf->ready_to_display = false;
+		buf->nonrealdisplay = false;
+		buf->queued_in_v4l2 = false;
+		mutex_init(&buf->lock);
+	} else {
+		buf->lastframe = false;
+	}
+
+	return 0;
+}
+
+static int vb2ops_vdec_start_streaming(struct vb2_queue *q, unsigned int count)
+{
+	struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(q);
+
+	if (ctx->state == MTK_STATE_FLUSH)
+		ctx->state = MTK_STATE_HEADER;
+
+	return 0;
+}
+
+static void vb2ops_vdec_stop_streaming(struct vb2_queue *q)
+{
+	struct vb2_buffer *src_buf = NULL, *dst_buf = NULL;
+	struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(q);
+
+	mtk_v4l2_debug(1, "[%d] (%d) state=(%x) ctx->decoded_frame_cnt=%d",
+			ctx->idx, q->type, ctx->state, ctx->decoded_frame_cnt);
+
+	if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
+		src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
+		while (src_buf) {
+			v4l2_m2m_buf_done(to_vb2_v4l2_buffer(src_buf),
+					VB2_BUF_STATE_ERROR);
+			src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
+		}
+	} else if (q->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
+		int i;
+		struct vb2_v4l2_buffer *vb2_v4l2;
+		struct mtk_video_buf *buf;
+
+		if (ctx->state >= MTK_STATE_HEADER)
+			mtk_vdec_flush_decoder(ctx);
+
+		ctx->state = MTK_STATE_FLUSH;
+
+		dst_buf = v4l2_m2m_dst_buf_remove(ctx->m2m_ctx);
+		while (dst_buf) {
+			vb2_set_plane_payload(dst_buf, 0, 0);
+			vb2_set_plane_payload(dst_buf, 1, 0);
+			v4l2_m2m_buf_done(to_vb2_v4l2_buffer(dst_buf),
+				VB2_BUF_STATE_ERROR);
+			dst_buf = v4l2_m2m_dst_buf_remove(ctx->m2m_ctx);
+		}
+
+		for (i = 0; i < q->num_buffers; ++i) {
+			if (q->bufs[i]->state == VB2_BUF_STATE_ACTIVE) {
+				vb2_v4l2 = container_of(q->bufs[i],
+					struct vb2_v4l2_buffer, vb2_buf);
+				buf = container_of(vb2_v4l2,
+					struct mtk_video_buf, vb);
+
+				mtk_v4l2_debug(1, "[%d] idx=%d, type=%d, [%d %d] %d -> VB2_BUF_STATE_ERROR",
+						ctx->idx, i, q->type,
+						buf->queued_in_vb2,
+						buf->queued_in_v4l2,
+						(int)q->bufs[i]->state);
+				v4l2_m2m_buf_done(vb2_v4l2,
+						VB2_BUF_STATE_ERROR);
+			}
+		}
+	}
+}
+
+static void m2mops_vdec_device_run(void *priv)
+{
+	struct mtk_vcodec_ctx *ctx = priv;
+	struct mtk_vcodec_dev *dev = ctx->dev;
+
+	queue_work(dev->decode_workqueue, &ctx->decode_work);
+}
+
+static int m2mops_vdec_job_ready(void *m2m_priv)
+{
+	struct mtk_vcodec_ctx *ctx = m2m_priv;
+
+	mtk_v4l2_debug(3, "[%d]", ctx->idx);
+
+	if (!v4l2_m2m_num_src_bufs_ready(ctx->m2m_ctx))
+		return 0;
+
+	if (!v4l2_m2m_num_dst_bufs_ready(ctx->m2m_ctx))
+		return 0;
+
+	if (ctx->state == MTK_STATE_ABORT)
+		return 0;
+
+	if ((ctx->last_decoded_picinfo.pic_w != ctx->picinfo.pic_w) ||
+	    (ctx->last_decoded_picinfo.pic_h != ctx->picinfo.pic_h))
+		return 0;
+
+	if (ctx->state != MTK_STATE_HEADER)
+		return 0;
+
+	return 1;
+}
+
+static void m2mops_vdec_job_abort(void *priv)
+{
+	struct mtk_vcodec_ctx *ctx = priv;
+
+	ctx->state = MTK_STATE_ABORT;
+}
+
+static int mtk_vdec_g_v_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct mtk_vcodec_ctx *ctx = ctrl_to_ctx(ctrl);
+
+	switch (ctrl->id) {
+	case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
+		if (ctx->state >= MTK_STATE_HEADER) {
+			ctrl->val = ctx->dpb_count;
+		} else {
+			mtk_v4l2_err("Seqinfo not ready");
+			ctrl->val = 1;
+			return -EAGAIN;
+		}
+		break;
+	default:
+		mtk_v4l2_err("ctrl-id=%d not support!", ctrl->id);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static const struct v4l2_ctrl_ops mtk_vcodec_dec_ctrl_ops = {
+	.g_volatile_ctrl = mtk_vdec_g_v_ctrl,
+};
+
+int mtk_vdec_ctrls_setup(struct mtk_vcodec_ctx *ctx)
+{
+	struct v4l2_ctrl *ctrl;
+
+	v4l2_ctrl_handler_init(&ctx->ctrl_hdl, 1);
+
+	ctrl = v4l2_ctrl_new_std(&ctx->ctrl_hdl,
+					  &mtk_vcodec_dec_ctrl_ops,
+					  V4L2_CID_MIN_BUFFERS_FOR_CAPTURE,
+					  1, 32, 1, 1);
+	ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
+
+	if (ctx->ctrl_hdl.error) {
+		mtk_v4l2_err("Adding control failed %d",
+					ctx->ctrl_hdl.error);
+		return ctx->ctrl_hdl.error;
+	}
+
+	v4l2_ctrl_handler_setup(&ctx->ctrl_hdl);
+	return 0;
+}
+
+void mtk_vdec_ctrls_free(struct mtk_vcodec_ctx *ctx)
+{
+	v4l2_ctrl_handler_free(&ctx->ctrl_hdl);
+}
+
+static void m2mops_vdec_lock(void *m2m_priv)
+{
+	struct mtk_vcodec_ctx *ctx = m2m_priv;
+
+	mtk_v4l2_debug(3, "[%d]", ctx->idx);
+	mutex_lock(&ctx->dev->dev_mutex);
+}
+
+static void m2mops_vdec_unlock(void *m2m_priv)
+{
+	struct mtk_vcodec_ctx *ctx = m2m_priv;
+
+	mtk_v4l2_debug(3, "[%d]", ctx->idx);
+	mutex_unlock(&ctx->dev->dev_mutex);
+}
+
+const struct v4l2_m2m_ops mtk_vdec_m2m_ops = {
+	.device_run	= m2mops_vdec_device_run,
+	.job_ready	= m2mops_vdec_job_ready,
+	.job_abort	= m2mops_vdec_job_abort,
+	.lock	= m2mops_vdec_lock,
+	.unlock	= m2mops_vdec_unlock,
+};
+
+const struct vb2_ops mtk_vdec_vb2_ops = {
+	.queue_setup	= vb2ops_vdec_queue_setup,
+	.buf_prepare	= vb2ops_vdec_buf_prepare,
+	.buf_queue	= vb2ops_vdec_buf_queue,
+	.wait_prepare	= vb2_ops_wait_prepare,
+	.wait_finish	= vb2_ops_wait_finish,
+	.buf_init	= vb2ops_vdec_buf_init,
+	.buf_finish	= vb2ops_vdec_buf_finish,
+	.start_streaming	= vb2ops_vdec_start_streaming,
+	.stop_streaming	= vb2ops_vdec_stop_streaming,
+};
+
+const struct v4l2_ioctl_ops mtk_vdec_ioctl_ops = {
+	.vidioc_streamon	= vidioc_vdec_streamon,
+	.vidioc_streamoff	= vidioc_vdec_streamoff,
+
+	.vidioc_reqbufs		= vidioc_vdec_reqbufs,
+	.vidioc_querybuf	= vidioc_vdec_querybuf,
+	.vidioc_qbuf	= vidioc_vdec_qbuf,
+	.vidioc_expbuf	= vidioc_vdec_expbuf,
+	.vidioc_dqbuf	= vidioc_vdec_dqbuf,
+
+	.vidioc_try_fmt_vid_cap_mplane	= vidioc_try_fmt_vid_cap_mplane,
+	.vidioc_try_fmt_vid_out_mplane	= vidioc_try_fmt_vid_out_mplane,
+
+	.vidioc_s_fmt_vid_cap_mplane	= vidioc_vdec_s_fmt,
+	.vidioc_s_fmt_vid_out_mplane	= vidioc_vdec_s_fmt,
+	.vidioc_g_fmt_vid_cap_mplane	= vidioc_vdec_g_fmt,
+	.vidioc_g_fmt_vid_out_mplane	= vidioc_vdec_g_fmt,
+
+	.vidioc_enum_fmt_vid_cap_mplane	= vidioc_vdec_enum_fmt_vid_cap_mplane,
+	.vidioc_enum_fmt_vid_out_mplane	= vidioc_vdec_enum_fmt_vid_out_mplane,
+	.vidioc_enum_framesizes	= vidioc_enum_framesizes,
+
+	.vidioc_querycap	= vidioc_vdec_querycap,
+	.vidioc_subscribe_event	= vidioc_vdec_subscribe_evt,
+	.vidioc_unsubscribe_event	= vidioc_vdec_unsubscribe_evt,
+	.vidioc_g_crop	= vidioc_vdec_g_crop,
+};
diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h
new file mode 100644
index 0000000..cb5cb42
--- /dev/null
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h
@@ -0,0 +1,81 @@
+/*
+* Copyright (c) 2016 MediaTek Inc.
+* Author: PC Chen <pc.chen@xxxxxxxxxxxx>
+*         Tiffany Lin <tiffany.lin@xxxxxxxxxxxx>
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*/
+
+#ifndef _MTK_VCODEC_DEC_H_
+#define _MTK_VCODEC_DEC_H_
+
+#include <media/videobuf2-core.h>
+#include <media/videobuf2-v4l2.h>
+
+/**
+ * struct vdec_fb  - decoder frame buffer
+ * @base_y	: Y plane memory info
+ * @base_c	: C plane memory info
+ * @status      : frame buffer status (vdec_fb_status)
+ */
+struct vdec_fb {
+	struct mtk_vcodec_mem	base_y;
+	struct mtk_vcodec_mem	base_c;
+	unsigned int	status;
+};
+
+/**
+ * struct mtk_video_buf - Private data related to each VB2 buffer.
+ * @b:			VB2 buffer
+ * @list:			link list
+ * @used:		Output buffer contain decoded frame data
+ * @ready_to_display:	Output buffer not display yet
+ * @nonrealdisplay:	Output buffer is not display frame
+ * @queued_in_vb2:	Output buffer is queue in vb2
+ * @queued_in_v4l2:	Output buffer is in v4l2
+ * @lastframe:		Intput buffer is last buffer - EOS
+ * @frame_buffer:		Decode status of output buffer
+ * @lock:			V4L2 and decode thread should get mutex
+ *			before r/w info in mtk_video_buf
+ */
+struct mtk_video_buf {
+	struct vb2_v4l2_buffer	vb;
+	struct list_head	list;
+
+	bool	used;
+	bool	ready_to_display;
+	bool	nonrealdisplay;
+	bool	queued_in_vb2;
+	bool	queued_in_v4l2;
+	bool	lastframe;
+	struct vdec_fb	frame_buffer;
+	struct mutex	lock;
+};
+
+extern const struct v4l2_ioctl_ops mtk_vdec_ioctl_ops;
+extern const struct v4l2_m2m_ops mtk_vdec_m2m_ops;
+
+
+/*
+ * mtk_vdec_lock/mtk_vdec_unlock are for ctx instance to
+ * get/release lock before/after access decoder hw.
+ * mtk_vdec_lock get decoder hw lock and set curr_ctx
+ * to ctx instance that get lock
+ */
+int mtk_vdec_unlock(struct mtk_vcodec_ctx *ctx);
+int mtk_vdec_lock(struct mtk_vcodec_ctx *ctx);
+int m2mctx_vdec_queue_init(void *priv, struct vb2_queue *src_vq,
+			   struct vb2_queue *dst_vq);
+void mtk_vcodec_dec_set_default_params(struct mtk_vcodec_ctx *ctx);
+void mtk_vcodec_vdec_release(struct mtk_vcodec_ctx *ctx);
+int mtk_vdec_ctrls_setup(struct mtk_vcodec_ctx *ctx);
+void mtk_vdec_ctrls_free(struct mtk_vcodec_ctx *ctx);
+
+#endif /* _MTK_VCODEC_DEC_H_ */
diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
new file mode 100644
index 0000000..34e3217
--- /dev/null
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
@@ -0,0 +1,469 @@
+/*
+* Copyright (c) 2016 MediaTek Inc.
+* Author: PC Chen <pc.chen@xxxxxxxxxxxx>
+*         Tiffany Lin <tiffany.lin@xxxxxxxxxxxx>
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*/
+
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-mem2mem.h>
+#include <media/videobuf2-dma-contig.h>
+
+#include "mtk_vcodec_drv.h"
+#include "mtk_vcodec_dec.h"
+#include "mtk_vcodec_dec_pm.h"
+#include "mtk_vcodec_intr.h"
+#include "mtk_vcodec_util.h"
+#include "vdec_drv_if.h"
+#include "mtk_vpu.h"
+
+module_param(mtk_v4l2_dbg_level, int, S_IRUGO | S_IWUSR);
+module_param(mtk_vcodec_dbg, bool, S_IRUGO | S_IWUSR);
+
+#define VDEC_HW_ACTIVE	0x10
+#define VDEC_IRQ_CFG	0x11
+#define VDEC_IRQ_CLR	0x10
+#define VDEC_IRQ_CFG_REG	0xa4
+
+
+/* Wake up context wait_queue */
+static void wake_up_ctx(struct mtk_vcodec_ctx *ctx, unsigned int reason)
+{
+	ctx->int_cond = 1;
+	ctx->int_type = reason;
+	wake_up_interruptible(&ctx->queue);
+}
+
+static irqreturn_t mtk_vcodec_dec_irq_handler(int irq, void *priv)
+{
+	struct mtk_vcodec_dev *dev = priv;
+	unsigned long flags;
+	struct mtk_vcodec_ctx *ctx;
+	unsigned int cg_status = 0;
+	unsigned int dec_done_status = 0;
+
+	spin_lock_irqsave(&dev->irqlock, flags);
+	ctx = dev->curr_ctx;
+	spin_unlock_irqrestore(&dev->irqlock, flags);
+
+	cg_status = readl(dev->reg_base[0] + (0));
+	if ((cg_status & VDEC_HW_ACTIVE) != 0) {
+		mtk_v4l2_err("DEC ISR, VDEC active is not 0x0 (0x%08x)",
+			       cg_status);
+		return IRQ_HANDLED;
+	}
+
+	dec_done_status = readl(dev->reg_base[1] + VDEC_IRQ_CFG_REG);
+	ctx->irq_status = dec_done_status;
+	if ((dec_done_status & (0x1 << 16)) != 0x10000)
+		return IRQ_HANDLED;
+
+	/* clear interrupt */
+	writel((readl(dev->reg_base[1] + VDEC_IRQ_CFG_REG) | VDEC_IRQ_CFG),
+	       dev->reg_base[1] + VDEC_IRQ_CFG_REG);
+	writel((readl(dev->reg_base[1] + VDEC_IRQ_CFG_REG) & ~VDEC_IRQ_CLR),
+	       dev->reg_base[1] + VDEC_IRQ_CFG_REG);
+
+	wake_up_ctx(ctx, MTK_INST_IRQ_RECEIVED);
+
+	mtk_v4l2_debug(3,
+			"mtk_vcodec_dec_irq_handler :wake up ctx %d, dec_done_status=%x",
+			ctx->idx, dec_done_status);
+
+
+	return IRQ_HANDLED;
+}
+
+static int fops_vcodec_open(struct file *file)
+{
+	struct video_device *vfd = video_devdata(file);
+	struct mtk_vcodec_dev *dev = video_drvdata(file);
+	struct mtk_vcodec_ctx *ctx = NULL;
+	int ret = 0;
+
+	if (dev->instance_mask == ~0UL) {
+		mtk_v4l2_err("Too many open contexts");
+		ret = -EBUSY;
+		goto err_alloc;
+	}
+
+	mutex_lock(&dev->dev_mutex);
+
+	ctx = devm_kzalloc(&dev->plat_dev->dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx) {
+		ret = -ENOMEM;
+		goto err_alloc;
+	}
+
+	ctx->idx = ffz(dev->instance_mask);
+	v4l2_fh_init(&ctx->fh, video_devdata(file));
+	file->private_data = &ctx->fh;
+	v4l2_fh_add(&ctx->fh);
+	INIT_LIST_HEAD(&ctx->list);
+	ctx->dev = dev;
+	init_waitqueue_head(&ctx->queue);
+
+	if (vfd == dev->vfd_dec) {
+		ctx->type = MTK_INST_DECODER;
+		ret = mtk_vdec_ctrls_setup(ctx);
+		if (ret) {
+			mtk_v4l2_err("Failed to setup mt vcodec controls");
+			goto err_ctrls_setup;
+		}
+		ctx->m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev_dec, ctx,
+						 &m2mctx_vdec_queue_init);
+		if (IS_ERR(ctx->m2m_ctx)) {
+			ret = PTR_ERR(ctx->m2m_ctx);
+			mtk_v4l2_err("Failed to v4l2_m2m_ctx_init() (%d)",
+				       ret);
+			goto err_ctx_init;
+		}
+		mtk_vcodec_dec_set_default_params(ctx);
+	} else {
+		mtk_v4l2_err("Invalid vfd !");
+		ret = -ENOENT;
+		goto err_ctx_init;
+	}
+
+	if (v4l2_fh_is_singular(&ctx->fh)) {
+		mtk_vcodec_dec_pw_on(&dev->pm);
+		ret = vpu_load_firmware(dev->vpu_plat_dev);
+		if (ret < 0) {
+			mtk_v4l2_err("vpu_load_firmware failed!");
+			goto err_load_fw;
+		}
+
+		dev->dec_capability =
+			vpu_get_vdec_hw_capa(dev->vpu_plat_dev);
+		mtk_v4l2_debug(0, "decoder capability %x",
+			       dev->dec_capability);
+	}
+
+	set_bit(ctx->idx, &dev->instance_mask);
+	dev->num_instances++;
+	list_add(&ctx->list, &dev->ctx_list);
+	mutex_unlock(&dev->dev_mutex);
+	mtk_v4l2_debug(0, "%s decoder [%d]", dev_name(&dev->plat_dev->dev),
+					ctx->idx);
+
+	return ret;
+
+	/* Deinit when failure occurred */
+err_load_fw:
+	v4l2_m2m_ctx_release(ctx->m2m_ctx);
+err_ctx_init:
+	mtk_vdec_ctrls_free(ctx);
+err_ctrls_setup:
+	v4l2_fh_del(&ctx->fh);
+	v4l2_fh_exit(&ctx->fh);
+	devm_kfree(&dev->plat_dev->dev, ctx);
+err_alloc:
+	mutex_unlock(&dev->dev_mutex);
+
+	return ret;
+}
+
+static int fops_vcodec_release(struct file *file)
+{
+	struct mtk_vcodec_dev *dev = video_drvdata(file);
+	struct mtk_vcodec_ctx *ctx = fh_to_ctx(file->private_data);
+
+	mtk_v4l2_debug(0, "[%d] decoder", ctx->idx);
+
+	mutex_lock(&dev->dev_mutex);
+	v4l2_m2m_ctx_release(ctx->m2m_ctx);
+	mtk_vcodec_vdec_release(ctx);
+	mtk_vdec_ctrls_free(ctx);
+	v4l2_fh_del(&ctx->fh);
+	v4l2_fh_exit(&ctx->fh);
+	list_del_init(&ctx->list);
+	dev->num_instances--;
+	if (dev->num_instances == 0)
+		mtk_vcodec_dec_pw_off(&dev->pm);
+	clear_bit(ctx->idx, &dev->instance_mask);
+	devm_kfree(&dev->plat_dev->dev, ctx);
+	mutex_unlock(&dev->dev_mutex);
+	return 0;
+}
+
+static unsigned int fops_vcodec_poll(struct file *file,
+				     struct poll_table_struct *wait)
+{
+	struct mtk_vcodec_ctx *ctx = fh_to_ctx(file->private_data);
+	struct mtk_vcodec_dev *dev = ctx->dev;
+	int ret;
+
+	mutex_lock(&dev->dev_mutex);
+	ret = v4l2_m2m_poll(file, ctx->m2m_ctx, wait);
+	mutex_unlock(&dev->dev_mutex);
+
+	return ret;
+}
+
+static int fops_vcodec_mmap(struct file *file, struct vm_area_struct *vma)
+{
+	struct mtk_vcodec_ctx *ctx = fh_to_ctx(file->private_data);
+
+	return v4l2_m2m_mmap(file, ctx->m2m_ctx, vma);
+}
+
+static const struct v4l2_file_operations mtk_vcodec_fops = {
+	.owner				= THIS_MODULE,
+	.open				= fops_vcodec_open,
+	.release			= fops_vcodec_release,
+	.poll				= fops_vcodec_poll,
+	.unlocked_ioctl			= video_ioctl2,
+	.mmap				= fops_vcodec_mmap,
+};
+
+static void mtk_vcodec_dec_reset_handler(void *priv)
+{
+	struct mtk_vcodec_dev *dev = priv;
+	struct mtk_vcodec_ctx *ctx;
+
+	mtk_v4l2_debug(0, "Watchdog timeout!!");
+
+	mutex_lock(&dev->dev_mutex);
+	list_for_each_entry(ctx, &dev->ctx_list, list) {
+		ctx->state = MTK_STATE_ABORT;
+		mtk_v4l2_debug(0, "[%d] Change to state MTK_STATE_ERROR",
+					   ctx->idx);
+	}
+	mutex_unlock(&dev->dev_mutex);
+}
+
+static int mtk_vcodec_probe(struct platform_device *pdev)
+{
+	struct mtk_vcodec_dev *dev;
+	struct video_device *vfd_dec;
+	struct resource *res;
+	int i, ret;
+	int reg_base_num;
+
+	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&dev->ctx_list);
+	dev->plat_dev = pdev;
+	dev->vpu_plat_dev = vpu_get_plat_device(dev->plat_dev);
+	if (dev->vpu_plat_dev == NULL) {
+		mtk_v4l2_err("[VPU] vpu device in not ready");
+		return -EPROBE_DEFER;
+	}
+
+	vpu_wdt_reg_handler(dev->vpu_plat_dev, mtk_vcodec_dec_reset_handler,
+				dev, VPU_RST_DEC);
+
+	ret = mtk_vcodec_init_dec_pm(dev);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to get mt vcodec clock source");
+		return ret;
+	}
+
+	reg_base_num = NUM_MAX_VDEC_REG_BASE;
+	for (i = 0; i < reg_base_num; i++) {
+		res = platform_get_resource(pdev, IORESOURCE_MEM, i);
+		if (res == NULL) {
+			dev_err(&pdev->dev, "get memory resource failed.");
+			ret = -ENXIO;
+			goto err_res;
+		}
+		dev->reg_base[i] = devm_ioremap_resource(&pdev->dev, res);
+		if (IS_ERR(dev->reg_base[i])) {
+			dev_err(&pdev->dev,
+				"devm_ioremap_resource %d failed.", i);
+			ret = PTR_ERR(dev->reg_base);
+			goto err_res;
+		}
+		mtk_v4l2_debug(2, "reg[%d] base=%p", i, dev->reg_base[i]);
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (res == NULL) {
+		dev_err(&pdev->dev, "failed to get irq resource");
+		ret = -ENOENT;
+		goto err_res;
+	}
+
+	dev->dec_irq = platform_get_irq(pdev, 0);
+	ret = devm_request_irq(&pdev->dev, dev->dec_irq,
+			       mtk_vcodec_dec_irq_handler, 0, pdev->name, dev);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to install dev->dec_irq %d (%d)",
+			dev->dec_irq,
+			ret);
+		ret = -EINVAL;
+		goto err_res;
+	}
+
+	disable_irq(dev->dec_irq);
+	mutex_init(&dev->dev_mutex);
+	mutex_init(&dev->dec_mutex);
+	spin_lock_init(&dev->irqlock);
+
+	snprintf(dev->v4l2_dev.name, sizeof(dev->v4l2_dev.name), "%s",
+		 "[MTK_V4L2]");
+
+	ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
+	if (ret) {
+		mtk_v4l2_err("v4l2_device_register err=%d", ret);
+		return ret;
+	}
+
+	init_waitqueue_head(&dev->queue);
+
+	vfd_dec = video_device_alloc();
+	if (!vfd_dec) {
+		mtk_v4l2_err("Failed to allocate video device");
+		ret = -ENOMEM;
+		goto err_dec_alloc;
+	}
+	vfd_dec->fops		= &mtk_vcodec_fops;
+	vfd_dec->ioctl_ops	= &mtk_vdec_ioctl_ops;
+	vfd_dec->release	= video_device_release;
+	vfd_dec->lock		= &dev->dev_mutex;
+	vfd_dec->v4l2_dev	= &dev->v4l2_dev;
+	vfd_dec->vfl_dir	= VFL_DIR_M2M;
+
+	snprintf(vfd_dec->name, sizeof(vfd_dec->name), "%s",
+		 MTK_VCODEC_DEC_NAME);
+	video_set_drvdata(vfd_dec, dev);
+	dev->vfd_dec = vfd_dec;
+	platform_set_drvdata(pdev, dev);
+
+	dev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
+	if (IS_ERR(dev->alloc_ctx)) {
+		mtk_v4l2_err("Failed to alloc vb2 dma context 0");
+		ret = PTR_ERR(dev->alloc_ctx);
+		goto err_vb2_ctx_init;
+	}
+
+	dev->m2m_dev_dec = v4l2_m2m_init(&mtk_vdec_m2m_ops);
+	if (IS_ERR(dev->m2m_dev_dec)) {
+		mtk_v4l2_err("Failed to init mem2mem dec device");
+		ret = PTR_ERR(dev->m2m_dev_dec);
+		goto err_dec_mem_init;
+	}
+
+	dev->decode_workqueue =
+			alloc_ordered_workqueue(MTK_VCODEC_DEC_NAME,
+			WQ_MEM_RECLAIM | WQ_FREEZABLE);
+	if (!dev->decode_workqueue) {
+		mtk_v4l2_err("Failed to create decode workqueue");
+		ret = -EINVAL;
+		goto err_event_workq;
+	}
+
+	ret = video_register_device(vfd_dec, VFL_TYPE_GRABBER, 0);
+	if (ret) {
+		mtk_v4l2_err("Failed to register video device");
+		goto err_dec_reg;
+	}
+	mtk_v4l2_debug(0, "decoder registered as /dev/video%d",
+			 vfd_dec->num);
+
+	return 0;
+
+err_dec_reg:
+	destroy_workqueue(dev->decode_workqueue);
+err_event_workq:
+	v4l2_m2m_release(dev->m2m_dev_dec);
+err_dec_mem_init:
+	vb2_dma_contig_cleanup_ctx(dev->alloc_ctx);
+err_vb2_ctx_init:
+	video_unregister_device(vfd_dec);
+err_dec_alloc:
+	v4l2_device_unregister(&dev->v4l2_dev);
+err_res:
+	mtk_vcodec_release_dec_pm(dev);
+	return ret;
+}
+
+static const struct of_device_id mtk_vcodec_match[] = {
+	{.compatible = "mediatek,mt8173-vcodec-dec",},
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, mtk_vcodec_match);
+
+static int mtk_vcodec_dec_remove(struct platform_device *pdev)
+{
+	struct mtk_vcodec_dev *dev = platform_get_drvdata(pdev);
+
+	mtk_v4l2_debug_enter();
+	flush_workqueue(dev->decode_workqueue);
+	destroy_workqueue(dev->decode_workqueue);
+	if (dev->m2m_dev_dec)
+		v4l2_m2m_release(dev->m2m_dev_dec);
+	if (dev->alloc_ctx)
+		vb2_dma_contig_cleanup_ctx(dev->alloc_ctx);
+
+	if (dev->vfd_dec)
+		video_unregister_device(dev->vfd_dec);
+
+	v4l2_device_unregister(&dev->v4l2_dev);
+	mtk_vcodec_release_dec_pm(dev);
+	return 0;
+}
+
+static int mtk_vcodec_vdec_pm_runtime_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct mtk_vcodec_dev *m_dev = platform_get_drvdata(pdev);
+
+	mtk_v4l2_debug(3, "m_dev->num_instances=%d", m_dev->num_instances);
+
+	if (m_dev->num_instances == 0)
+		return 0;
+
+	return 0;
+}
+
+static int mtk_vcodec_vdec_pm_runtime_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct mtk_vcodec_dev *m_dev = platform_get_drvdata(pdev);
+
+	mtk_v4l2_debug(3, "m_dev->num_instances=%d", m_dev->num_instances);
+
+	if (m_dev->num_instances == 0)
+		return 0;
+
+	return 0;
+}
+
+static const struct dev_pm_ops mtk_vcodec_vdec_pm_ops = {
+	SET_RUNTIME_PM_OPS(mtk_vcodec_vdec_pm_runtime_suspend,
+			   mtk_vcodec_vdec_pm_runtime_resume,
+			   NULL)
+};
+
+static struct platform_driver mtk_vcodec_dec_driver = {
+	.probe	= mtk_vcodec_probe,
+	.remove	= mtk_vcodec_dec_remove,
+	.driver	= {
+		.name	= MTK_VCODEC_DEC_NAME,
+		.owner	= THIS_MODULE,
+		.of_match_table = mtk_vcodec_match,
+		.pm = &mtk_vcodec_vdec_pm_ops,
+	},
+};
+
+module_platform_driver(mtk_vcodec_dec_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Mediatek video codec V4L2 driver");
diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c
new file mode 100644
index 0000000..aa1701f
--- /dev/null
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c
@@ -0,0 +1,153 @@
+/*
+* Copyright (c) 2016 MediaTek Inc.
+* Author: Tiffany Lin <tiffany.lin@xxxxxxxxxxxx>
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*/
+
+#include <linux/clk.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/pm_runtime.h>
+#include <soc/mediatek/smi.h>
+
+#include "mtk_vcodec_dec_pm.h"
+#include "mtk_vcodec_util.h"
+#include "mtk_vpu.h"
+
+int mtk_vcodec_init_dec_pm(struct mtk_vcodec_dev *mtkdev)
+{
+	struct device_node *node;
+	struct platform_device *pdev;
+	struct device *dev;
+	struct mtk_vcodec_pm *pm;
+	int ret = 0;
+
+	pdev = mtkdev->plat_dev;
+	pm = &mtkdev->pm;
+	pm->mtkdev = mtkdev;
+	dev = &pdev->dev;
+	node = of_parse_phandle(dev->of_node, "mediatek,larb", 0);
+	if (!node)
+		return -1;
+
+	pdev = of_find_device_by_node(node);
+	if (WARN_ON(!pdev)) {
+		of_node_put(node);
+		return -1;
+	}
+	pm->larbvdec = &pdev->dev;
+
+	pdev = mtkdev->plat_dev;
+	pm_runtime_enable(&pdev->dev);
+	pm->dev = &pdev->dev;
+
+	pm->vcodecpll = devm_clk_get(&pdev->dev, "vcodecpll");
+	if (pm->vcodecpll == NULL) {
+		mtk_v4l2_err("devm_clk_get vcodecpll fail");
+		ret = -1;
+	}
+
+	pm->univpll_d2 = devm_clk_get(&pdev->dev, "univpll_d2");
+	if (pm->univpll_d2 == NULL) {
+		mtk_v4l2_err("devm_clk_get univpll_d2 fail");
+		ret = -1;
+	}
+
+	pm->clk_cci400_sel = devm_clk_get(&pdev->dev, "clk_cci400_sel");
+	if (pm->clk_cci400_sel == NULL) {
+		mtk_v4l2_err("devm_clk_get clk_cci400_sel fail");
+		ret = -1;
+	}
+
+	pm->vdec_sel = devm_clk_get(&pdev->dev, "vdec_sel");
+	if (pm->vdec_sel == NULL) {
+		mtk_v4l2_err("devm_clk_get vdec_sel fail");
+		ret = -1;
+	}
+
+	pm->vdecpll = devm_clk_get(&pdev->dev, "vdecpll");
+	if (pm->vdecpll == NULL) {
+		mtk_v4l2_err("devm_clk_get vdecpll fail");
+		ret = -1;
+	}
+
+	return ret;
+}
+
+void mtk_vcodec_release_dec_pm(struct mtk_vcodec_dev *dev)
+{
+	pm_runtime_disable(dev->pm.dev);
+}
+
+void mtk_vcodec_dec_pw_on(struct mtk_vcodec_pm *pm)
+{
+	int ret;
+
+	ret = pm_runtime_get_sync(pm->dev);
+	if (ret)
+		mtk_v4l2_err("pm_runtime_get_sync fail %d", ret);
+}
+
+void mtk_vcodec_dec_pw_off(struct mtk_vcodec_pm *pm)
+{
+	int ret;
+
+	ret = pm_runtime_put_sync(pm->dev);
+	if (ret)
+		mtk_v4l2_err("pm_runtime_put_sync fail %d", ret);
+}
+
+void mtk_vcodec_dec_clock_on(struct mtk_vcodec_pm *pm)
+{
+	int ret;
+
+	clk_set_rate(pm->vcodecpll, 1482 * 1000000);
+
+	ret = clk_prepare_enable(pm->vcodecpll);
+	if (ret)
+		mtk_v4l2_err("vcodecpll fail %d", ret);
+
+	ret = clk_prepare_enable(pm->univpll_d2);
+	if (ret)
+		mtk_v4l2_err("univpll_d2 fail %d", ret);
+
+	ret = clk_prepare_enable(pm->clk_cci400_sel);
+	if (ret)
+		mtk_v4l2_err("clk_cci400_sel fail %d", ret);
+
+	ret = clk_set_parent(pm->clk_cci400_sel, pm->univpll_d2);
+	if (ret)
+		mtk_v4l2_err("clk_set_parent fail %d", ret);
+
+	ret = clk_prepare_enable(pm->vdecpll);
+	if (ret)
+		mtk_v4l2_err("vdecpll fail %d", ret);
+
+	ret = clk_prepare_enable(pm->vdec_sel);
+	if (ret)
+		mtk_v4l2_err("vdec_sel fail %d", ret);
+
+	ret = clk_set_parent(pm->vdec_sel, pm->vdecpll);
+	if (ret)
+		mtk_v4l2_err("clk_set_parent fail %d", ret);
+
+	ret = mtk_smi_larb_get(pm->larbvdec);
+	if (ret)
+		mtk_v4l2_err("mtk_smi_larb_get larbvdec fail %d", ret);
+
+}
+
+void mtk_vcodec_dec_clock_off(struct mtk_vcodec_pm *pm)
+{
+	mtk_smi_larb_put(pm->larbvdec);
+	clk_disable_unprepare(pm->vdec_sel);
+	clk_disable_unprepare(pm->vdecpll);
+}
diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h
new file mode 100644
index 0000000..28de4c1
--- /dev/null
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h
@@ -0,0 +1,28 @@
+/*
+* Copyright (c) 2016 MediaTek Inc.
+* Author: Tiffany Lin <tiffany.lin@xxxxxxxxxxxx>
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*/
+
+#ifndef _MTK_VCODEC_DEC_PM_H_
+#define _MTK_VCODEC_DEC_PM_H_
+
+#include "mtk_vcodec_drv.h"
+
+int mtk_vcodec_init_dec_pm(struct mtk_vcodec_dev *dev);
+void mtk_vcodec_release_dec_pm(struct mtk_vcodec_dev *dev);
+
+void mtk_vcodec_dec_pw_on(struct mtk_vcodec_pm *pm);
+void mtk_vcodec_dec_pw_off(struct mtk_vcodec_pm *pm);
+void mtk_vcodec_dec_clock_on(struct mtk_vcodec_pm *pm);
+void mtk_vcodec_dec_clock_off(struct mtk_vcodec_pm *pm);
+
+#endif /* _MTK_VCODEC_DEC_PM_H_ */
\ No newline at end of file
diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
index 55cf462..e3e3d66 100644
--- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
@@ -26,10 +26,10 @@
 #include "mtk_vcodec_util.h"
 
 #define MTK_VCODEC_DRV_NAME	"mtk_vcodec_drv"
+#define MTK_VCODEC_DEC_NAME	"mtk-vcodec-dec" 
 #define MTK_VCODEC_ENC_NAME	"mtk-vcodec-enc"
 #define MTK_PLATFORM_STR	"platform:mt8173"
 
-
 #define MTK_VCODEC_MAX_PLANES	3
 #define MTK_V4L2_BENCHMARK	0
 #define WAIT_INTR_TIMEOUT_MS	1000
@@ -145,18 +145,18 @@ struct mtk_q_data {
 /**
  * struct mtk_enc_params - General encoding parameters
  * @bitrate: target bitrate in bits per second
- * @num_b_frame:	number of b frames between p-frame
- * @rc_frame:	frame based rate control
+ * @num_b_frame: number of b frames between p-frame
+ * @rc_frame: frame based rate control
  * @rc_mb: macroblock based rate control
  * @seq_hdr_mode: H.264 sequence header is encoded separately or joined
- *				  with the first frame
+ *		  with the first frame
  * @intra_period: I frame period
- * @gop_size:	group of picture size, it's used as the intra frame period
- * @framerate_num: frame rate numerator. ex: framerate_num=30 and framerate_denom=1
- *				   menas FPS is 30
- * @framerate_denom:	frame rate denominator. ex: framerate_num=30 and
- *				       framerate_denom=1 menas FPS is 30
- * @h264_max_qp:	Max value for H.264 quantization parameter
+ * @gop_size: group of picture size, it's used as the intra frame period
+ * @framerate_num: frame rate numerator. ex: framerate_num=30 and
+ *		   framerate_denom=1 menas FPS is 30
+ * @framerate_denom: frame rate denominator. ex: framerate_num=30
+ *		     and framerate_denom=1 menas FPS is 30
+ * @h264_max_qp: Max value for H.264 quantization parameter
  * @h264_profile: V4L2 defined H.264 profile
  * @h264_level: V4L2 defined H.264 level
  * @force_intra: force/insert intra frame
@@ -197,33 +197,61 @@ struct mtk_vcodec_pm {
 	struct mtk_vcodec_dev	*mtkdev;
 };
 
+/**
+ * struct vdec_pic_info  - picture size information
+ * @pic_w: picture width
+ * @pic_h: picture height
+ * @buf_w: picture buffer width (16 aligned up from pic_w)
+ * @buf_h: picture buffer heiht (32 aligned up from pic_h)
+ * @y_bs_sz: Y bitstream size
+ * @c_bs_sz: CbCr bitstream size
+ * @y_len_sz: Y length size
+ * @c_len_sz: CbCr length size
+ * E.g. suppose picture size is 176x144,
+ *      buffer size will be aligned to 176x160.
+ */
+struct vdec_pic_info {
+	unsigned int pic_w;
+	unsigned int pic_h;
+	unsigned int buf_w;
+	unsigned int buf_h;
+	unsigned int y_bs_sz;
+	unsigned int c_bs_sz;
+	unsigned int y_len_sz;
+	unsigned int c_len_sz;
+};
 
 /**
  * struct mtk_vcodec_ctx - Context (instance) private data.
  *
  * @type: type of the instance - decoder or encoder
- * @dev:	pointer to the mtk_vcodec_dev of the device
+ * @dev: pointer to the mtk_vcodec_dev of the device
  * @list: link to ctx_list of mtk_vcodec_dev
  * @fh: struct v4l2_fh
  * @m2m_ctx: pointer to the v4l2_m2m_ctx of the context
  * @q_data: store information of input and output queue
- *		    of the context
+ *		of the context
  * @idx: index of the context that this structure describes
  * @state: state of the context
  * @param_change: indicate encode parameter type
  * @enc_params: encoding parameters
- * @enc_if: hoooked encoder driver interface
+ * @dec_if: hooked decoder driver interface
+ * @enc_if: hooked encoder driver interface
  * @drv_handle: driver handle for specific decode/encode instance
  *
+ * @picinfo: store picture info after header parsing
+ * @dpb_count: store dpb count after header parsing
  * @int_cond: variable used by the waitqueue
  * @int_type: type of the last interrupt
  * @queue: waitqueue that can be used to wait for this context to
- *		   finish
+ *	finish
  * @irq_status: irq status
  *
  * @ctrl_hdl: handler for v4l2 framework
  *
+ * @decode_work: worker for the decoding
  * @encode_work: worker for the encoding
+ * @last_decoded_picinfo: pic information get from latest decode
  */
 struct mtk_vcodec_ctx {
 	enum mtk_instance_type type;
@@ -238,17 +266,24 @@ struct mtk_vcodec_ctx {
 	enum mtk_encode_param param_change;
 	struct mtk_enc_params enc_params;
 
+	struct vdec_common_if *dec_if;
 	struct venc_common_if *enc_if;
 	unsigned long drv_handle;
 
+	struct vdec_pic_info picinfo;
+	int dpb_count;
+
 	int int_cond;
 	int int_type;
 	wait_queue_head_t queue;
 	unsigned int irq_status;
 
 	struct v4l2_ctrl_handler ctrl_hdl;
+	struct work_struct decode_work;
 	struct work_struct encode_work;
+	struct vdec_pic_info last_decoded_picinfo;
 
+	int decoded_frame_cnt;
 #if MTK_V4L2_BENCHMARK
 	unsigned int total_enc_dec_cnt;
 	unsigned int total_enc_dec_time;
@@ -289,36 +324,61 @@ struct mtk_vcodec_ctx {
  *
  * @encode_workqueue: encode work queue
  *
+ * @v4l2_dev: V4L2 device to register video devices for.
+ * @vfd_dec: Video device for decoder
+ * @vfd_enc: Video device for encoder
+ *
+ * @m2m_dev_dec: m2m device for decoder
+ * @m2m_dev_enc: m2m device for encoder
+ * @plat_dev: platform device
+ * @vpu_plat_dev: mtk vpu platform device
+ * @alloc_ctx:VB2 allocator context
+ *	      (for allocations without kernel mapping).
+ * @ctx_list: list of struct mtk_vcodec_ctx
+ * @irqlock: protect data access by irq handler and work thread
+ * @curr_ctx: The context that is waiting for codec hardware
+ * @reg_base: Mapped address of MTK Vcodec registers.
+ *
+ * @instance_mask: used to mark which index id are used
+ * @num_instances: counter of active MTK Vcodec instances
+ *
+ * @decode_workqueue: decode work queue
+ * @encode_workqueue: encode work queue
  * @int_cond: used to identify interrupt condition happen
  * @int_type: used to identify what kind of interrupt condition happen
  * @dev_mutex: video_device lock
  * @queue: waitqueue for waiting for completion of device commands
  *
+ * @dec_irq: decoder irq resource
  * @enc_irq: h264 encoder irq resource
- * @enc_lt_irq: vp8 encoder irq resource
+ * @enc_lt_irq: vp8 encoder lt irq resource
  *
- * @enc_mutex: encoder hardware lock.
+ * @dec_mutex: decoder hardware lock
+ * @enc_mutex: encoder hardware lock
  *
  * @pm: power management control
  * @dec_capability: used to identify decode capability, ex: 4k
- * @enc_capability:	 used to identify encode capability
+ * @enc_capability: used to identify encode capability
  */
 struct mtk_vcodec_dev {
 	struct v4l2_device	v4l2_dev;
+	struct video_device	*vfd_dec;
 	struct video_device	*vfd_enc;
 
+	struct v4l2_m2m_dev	*m2m_dev_dec;
 	struct v4l2_m2m_dev	*m2m_dev_enc;
 	struct platform_device	*plat_dev;
 	struct platform_device	*vpu_plat_dev;
 	struct vb2_alloc_ctx	*alloc_ctx;
 	struct list_head	ctx_list;
 	spinlock_t	irqlock;
-	struct mtk_vcodec_ctx *curr_ctx;
+	struct mtk_vcodec_ctx	*curr_ctx;
 	void __iomem	*reg_base[NUM_MAX_VCODEC_REG_BASE];
 
 	unsigned long	instance_mask;
 	int	num_instances;
 
+	struct workqueue_struct *decode_workqueue;
 	struct workqueue_struct *encode_workqueue;
 
 	int	int_cond;
@@ -326,9 +386,11 @@ struct mtk_vcodec_dev {
 	struct mutex	dev_mutex;
 	wait_queue_head_t	queue;
 
+	int	dec_irq;
 	int	enc_irq;
 	int	enc_lt_irq;
 
+	struct mutex	dec_mutex;
 	struct mutex	enc_mutex;
 
 	struct mtk_vcodec_pm	pm;
diff --git a/drivers/media/platform/mtk-vcodec/vdec_drv_base.h b/drivers/media/platform/mtk-vcodec/vdec_drv_base.h
new file mode 100644
index 0000000..73ea1fe
--- /dev/null
+++ b/drivers/media/platform/mtk-vcodec/vdec_drv_base.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2016 MediaTek Inc.
+ * Author: PC Chen <pc.chen@xxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _VDEC_DRV_BASE_
+#define _VDEC_DRV_BASE_
+
+#include "mtk_vcodec_drv.h"
+
+#include "vdec_drv_if.h"
+
+struct vdec_common_if {
+	/**
+	 * (*init)() - initialize decode driver
+	 * @ctx     : [in] mtk v4l2 context
+	 * @h_vdec  : [out] driver handle
+	 */
+	int (*init)(struct mtk_vcodec_ctx *ctx, unsigned long *h_vdec);
+
+	/**
+	 * (*decode)() - trigger decode
+	 * @h_vdec  : [in] driver handle
+	 * @bs      : [in] input bitstream
+	 * @fb      : [in] frame buffer to store decoded frame
+	 * @res_chg : [out] resolution change happen
+	 */
+	int (*decode)(unsigned long h_vdec, struct mtk_vcodec_mem *bs,
+		      struct vdec_fb *fb, bool *res_chg);
+
+	/**
+	 * (*get_param)() - get driver's parameter
+	 * @h_vdec : [in] driver handle
+	 * @type   : [in] input parameter type
+	 * @out    : [out] buffer to store query result
+	 */
+	int (*get_param)(unsigned long h_vdec, enum vdec_get_param_type type,
+			 void *out);
+
+	/**
+	 * (*deinit)() - deinitialize driver.
+	 * @h_vdec : [in] driver handle to be deinit
+	 */
+	int (*deinit)(unsigned long h_vdec);
+};
+
+#endif
diff --git a/drivers/media/platform/mtk-vcodec/vdec_drv_if.c b/drivers/media/platform/mtk-vcodec/vdec_drv_if.c
new file mode 100644
index 0000000..1d12719
--- /dev/null
+++ b/drivers/media/platform/mtk-vcodec/vdec_drv_if.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2016 MediaTek Inc.
+ * Author: PC Chen <pc.chen@xxxxxxxxxxxx>
+ *         Tiffany Lin <tiffany.lin@xxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+
+#include "vdec_drv_base.h"
+#include "vdec_drv_if.h"
+
+#include "mtk_vcodec_dec_pm.h"
+#include "mtk_vcodec_util.h"
+#include "mtk_vpu.h"
+
+int vdec_if_init(struct mtk_vcodec_ctx *ctx, unsigned int fourcc)
+{
+	int ret = 0;
+
+	switch (fourcc) {
+	case V4L2_PIX_FMT_H264:
+	case V4L2_PIX_FMT_VP8:
+	case V4L2_PIX_FMT_VP9:
+	default:
+		return -EINVAL;
+	}
+
+	mtk_vdec_lock(ctx);
+	mtk_vcodec_dec_clock_on(&ctx->dev->pm);
+	ret = ctx->dec_if->init(ctx, &ctx->drv_handle);
+	mtk_vcodec_dec_clock_off(&ctx->dev->pm);
+	mtk_vdec_unlock(ctx);
+
+	return ret;
+}
+
+int vdec_if_decode(struct mtk_vcodec_ctx *ctx, struct mtk_vcodec_mem *bs,
+		   struct vdec_fb *fb, bool *res_chg)
+{
+	unsigned long flags;
+	int ret = 0;
+
+	if (bs) {
+		if ((bs->dma_addr & 63) != 0)
+			return -EINVAL;
+	}
+
+	if (fb) {
+		if (((fb->base_y.dma_addr & 511) != 0) ||
+		    ((fb->base_c.dma_addr & 511) != 0))
+			return -EINVAL;
+	}
+
+	mtk_vdec_lock(ctx);
+
+	spin_lock_irqsave(&ctx->dev->irqlock, flags);
+	ctx->dev->curr_ctx = ctx;
+	spin_unlock_irqrestore(&ctx->dev->irqlock, flags);
+
+	mtk_vcodec_dec_clock_on(&ctx->dev->pm);
+	enable_irq(ctx->dev->dec_irq);
+	ret = ctx->dec_if->decode(ctx->drv_handle, bs, fb, res_chg);
+	disable_irq(ctx->dev->dec_irq);
+	mtk_vcodec_dec_clock_off(&ctx->dev->pm);
+
+	spin_lock_irqsave(&ctx->dev->irqlock, flags);
+	ctx->dev->curr_ctx = NULL;
+	spin_unlock_irqrestore(&ctx->dev->irqlock, flags);
+
+	mtk_vdec_unlock(ctx);
+
+	return ret;
+}
+
+int vdec_if_get_param(struct mtk_vcodec_ctx *ctx, enum vdec_get_param_type type,
+		      void *out)
+{
+	int ret = 0;
+
+	mtk_vdec_lock(ctx);
+	ret = ctx->dec_if->get_param(ctx->drv_handle, type, out);
+	mtk_vdec_unlock(ctx);
+
+	return ret;
+}
+
+int vdec_if_deinit(struct mtk_vcodec_ctx *ctx)
+{
+	int ret = 0;
+
+	if (ctx->drv_handle == 0)
+		return 0;
+
+	mtk_vdec_lock(ctx);
+	mtk_vcodec_dec_clock_on(&ctx->dev->pm);
+	ret = ctx->dec_if->deinit(ctx->drv_handle);
+	mtk_vcodec_dec_clock_off(&ctx->dev->pm);
+	mtk_vdec_unlock(ctx);
+
+	ctx->drv_handle = 0;
+	return ret;
+}
diff --git a/drivers/media/platform/mtk-vcodec/vdec_drv_if.h b/drivers/media/platform/mtk-vcodec/vdec_drv_if.h
new file mode 100644
index 0000000..9717446
--- /dev/null
+++ b/drivers/media/platform/mtk-vcodec/vdec_drv_if.h
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2016 MediaTek Inc.
+ * Author: PC Chen <pc.chen@xxxxxxxxxxxx>
+ *		   Tiffany Lin <tiffany.lin@xxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _VDEC_DRV_IF_H_
+#define _VDEC_DRV_IF_H_
+
+#include "mtk_vcodec_drv.h"
+#include "mtk_vcodec_dec.h"
+#include "mtk_vcodec_util.h"
+
+/**
+ * struct vdec_fb_status  - decoder frame buffer status
+ * @FB_ST_NORMAL	: initial state
+ * @FB_ST_DISPLAY	: frmae buffer is ready to be displayed
+ * @FB_ST_FREE		: frame buffer is not used by decoder any more
+ */
+enum vdec_fb_status {
+	FB_ST_NORMAL		= 0,
+	FB_ST_DISPLAY		= (1 << 0),
+	FB_ST_FREE		= (1 << 1)
+};
+
+enum vdec_get_param_type {
+	GET_PARAM_DISP_FRAME_BUFFER,
+	GET_PARAM_FREE_FRAME_BUFFER,
+	GET_PARAM_PIC_INFO,
+	GET_PARAM_CROP_INFO,
+	GET_PARAM_DPB_SIZE
+};
+
+/**
+ * struct vdec_fb_node  - decoder frame buffer node
+ * @list	: list to hold this node
+ * @fb		: point to frame buffer (vdec_fb)
+ */
+struct vdec_fb_node {
+	struct list_head list;
+	void *fb;
+};
+
+/**
+ * For the same vdec_handle, these functions below are not thread safe.
+ * For different vdec_handle, these functions can be called at the same time.
+ */
+
+/**
+ * vdec_if_init() - initialize decode driver
+ * @ctx      : [in] v4l2 context
+ * @fourcc   : [in] video format fourcc, V4L2_PIX_FMT_H264/VP8/VP9..
+ */
+int vdec_if_init(struct mtk_vcodec_ctx *ctx, unsigned int fourcc);
+
+/**
+ * vdec_if_deinit() - deinitialize decode driver
+ * @ctx : [in] v4l2 context
+ *
+ */
+int vdec_if_deinit(struct mtk_vcodec_ctx *ctx);
+
+/**
+ * vdec_if_decode() - trigger decode
+ * @handle  : [in] video decode handle
+ * @bs      : [in] input bitstream
+ * @fb      : [in] frame buffer to store decoded frame
+ * @res_chg : [out] resolution change happen
+ *
+ * while EOF flush decode, need to set input bitstream as NULL
+ */
+int vdec_if_decode(struct mtk_vcodec_ctx *ctx, struct mtk_vcodec_mem *bs,
+		   struct vdec_fb *fb, bool *res_chg);
+
+/**
+ * vdec_if_get_param() - get driver's parameter
+ * @handle : [in] video decode handle
+ * @type   : [in] input parameter type
+ * @out    : [out] buffer to store query result
+ */
+int vdec_if_get_param(struct mtk_vcodec_ctx *ctx, enum vdec_get_param_type type,
+		      void *out);
+
+#endif
diff --git a/drivers/media/platform/mtk-vcodec/vdec_ipi_msg.h b/drivers/media/platform/mtk-vcodec/vdec_ipi_msg.h
new file mode 100644
index 0000000..937192c
--- /dev/null
+++ b/drivers/media/platform/mtk-vcodec/vdec_ipi_msg.h
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2016 MediaTek Inc.
+ * Author: PC Chen <pc.chen@xxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _VDEC_IPI_MSG_H_
+#define _VDEC_IPI_MSG_H_
+
+/**
+ * enum vdec_ipi_msgid - message id between AP and VPU
+ * @AP_IPIMSG_XXX:		AP to VPU cmd message id
+ * @VPU_IPIMSG_XXX_DONE:	VPU ack AP cmd message id
+ */
+enum vdec_ipi_msgid {
+	AP_IPIMSG_DEC_INIT = 0xA000,
+	AP_IPIMSG_DEC_START = 0xA001,
+	AP_IPIMSG_DEC_END = 0xA002,
+	AP_IPIMSG_DEC_DEINIT = 0xA003,
+	AP_IPIMSG_DEC_RESET = 0xA004,
+
+	VPU_IPIMSG_DEC_INIT_ACK = 0xB000,
+	VPU_IPIMSG_DEC_START_ACK = 0xB001,
+	VPU_IPIMSG_DEC_END_ACK = 0xB002,
+	VPU_IPIMSG_DEC_DEINIT_ACK = 0xB003,
+	VPU_IPIMSG_DEC_RESET_ACK = 0xB004,
+};
+
+/**
+ * struct vdec_ap_ipi_cmd - generic AP to VPU ipi command format
+ * @msg_id		: vdec_ipi_msgid
+ * @vpu_inst_addr	: VPU decoder instance address
+ */
+struct vdec_ap_ipi_cmd {
+	uint32_t msg_id;
+	uint32_t vpu_inst_addr;
+};
+
+/**
+ * struct vdec_vpu_ipi_ack - generic VPU to AP ipi command format
+ * @msg_id      : vdec_ipi_msgid
+ * @status      : VPU exeuction result
+ * @vdec_inst   : AP video decoder instance address
+ */
+struct vdec_vpu_ipi_ack {
+	uint32_t msg_id;
+	int32_t status;
+	uint64_t vdec_inst;
+};
+
+/**
+ * struct vdec_ap_ipi_init - for AP_IPIMSG_DEC_INIT
+ * @msg_id        : AP_IPIMSG_DEC_INIT
+ * @reserved      : Reserved field
+ * @vdec_inst     : AP video decoder instance address
+ */
+struct vdec_ap_ipi_init {
+	uint32_t msg_id;
+	uint32_t reserved;
+	uint64_t vdec_inst;
+};
+
+/**
+ * struct vdec_vpu_ipi_init_ack - for VPU_IPIMSG_DEC_INIT_ACK
+ * @msg_id        : VPU_IPIMSG_DEC_INIT_ACK
+ * @status        : VPU exeuction result
+ * @vdec_inst     : AP video decoder instance address
+ * @vpu_inst_addr : VPU decoder instance address
+ */
+struct vdec_vpu_ipi_init_ack {
+	uint32_t msg_id;
+	int32_t status;
+	uint64_t vdec_inst;
+	uint32_t vpu_inst_addr;
+};
+
+#endif
-- 
1.7.9.5