From: Tiffany Lin <tiffany....@mediatek.com>

Also remove the code using size-0 OUTPUT buffer to flush.

Singed-off-by: Tiffany Lin <tiffany....@mediatek.com>
Signed-off-by: Wu-Cheng Li <wuchen...@chromium.org>
Reviewed-by: Kuang-che Wu <k...@chromium.org>
---
 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c | 151 ++++++++++++++-------
 .../media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c |  14 ++
 drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h |   2 +
 3 files changed, 117 insertions(+), 50 deletions(-)

diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c 
b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c
index 0746592..407c8ba 100644
--- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c
@@ -351,16 +351,6 @@ static void mtk_vdec_worker(struct work_struct *work)
        dst_vb2_v4l2 = container_of(dst_buf, struct vb2_v4l2_buffer, vb2_buf);
        dst_buf_info = container_of(dst_vb2_v4l2, struct mtk_video_dec_buf, vb);
 
-       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;
-       if (!buf.va) {
-               v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
-               mtk_v4l2_err("[%d] id=%d src_addr is NULL!!",
-                               ctx->id, 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);
@@ -371,8 +361,6 @@ static void mtk_vdec_worker(struct work_struct *work)
        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->id);
-       mtk_v4l2_debug(3, "[%d] Bitstream VA=%p DMA=%pad Size=%zx vb=%p",
-                       ctx->id, buf.va, &buf.dma_addr, buf.size, src_buf);
 
        mtk_v4l2_debug(3,
                        "id=%d Framebuf  pfb=%p VA=%p Y_DMA=%pad C_DMA=%pad 
Size=%zx",
@@ -381,24 +369,36 @@ static void mtk_vdec_worker(struct work_struct *work)
                        &pfb->base_c.dma_addr, pfb->base_y.size);
 
        if (src_buf_info->lastframe) {
-               /* update src buf status */
+               mtk_v4l2_debug(1, "Got empty flush input buffer.");
                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);
+               mutex_lock(&ctx->lock);
                dst_buf_info->used = false;
+               mutex_unlock(&ctx->lock);
 
                vdec_if_decode(ctx, NULL, NULL, &res_chg);
                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);
+               dst_vb2_v4l2->flags |= V4L2_BUF_FLAG_LAST;
                v4l2_m2m_buf_done(&dst_buf_info->vb, VB2_BUF_STATE_DONE);
                clean_free_buffer(ctx);
                v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
                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;
+       if (!buf.va) {
+               v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
+               mtk_v4l2_err("[%d] id=%d src_addr is NULL!!",
+                               ctx->id, src_buf->index);
+               return;
+       }
+       mtk_v4l2_debug(3, "[%d] Bitstream VA=%p DMA=%pad Size=%zx vb=%p",
+                       ctx->id, buf.va, &buf.dma_addr, buf.size, src_buf);
        dst_buf_info->vb.vb2_buf.timestamp
                        = src_buf_info->vb.vb2_buf.timestamp;
        dst_buf_info->vb.timecode
@@ -412,10 +412,9 @@ static void mtk_vdec_worker(struct work_struct *work)
 
        if (ret) {
                mtk_v4l2_err(
-                       " <===[%d], src_buf[%d]%d sz=0x%zx pts=%llu dst_buf[%d] 
vdec_if_decode() ret=%d res_chg=%d===>",
+                       " <===[%d], src_buf[%d] sz=0x%zx pts=%llu dst_buf[%d] 
vdec_if_decode() ret=%d res_chg=%d===>",
                        ctx->id,
                        src_buf->index,
-                       src_buf_info->lastframe,
                        buf.size,
                        src_buf_info->vb.vb2_buf.timestamp,
                        dst_buf->index,
@@ -456,6 +455,65 @@ static void mtk_vdec_worker(struct work_struct *work)
        v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
 }
 
+static int vidioc_try_decoder_cmd(struct file *file, void *priv,
+                               struct v4l2_decoder_cmd *cmd)
+{
+       switch (cmd->cmd) {
+       case V4L2_DEC_CMD_STOP:
+       case V4L2_DEC_CMD_START:
+               if (cmd->flags != 0) {
+                       mtk_v4l2_err("cmd->flags=%u", cmd->flags);
+                       return -EINVAL;
+               }
+               break;
+       default:
+               return -EINVAL;
+       }
+       return 0;
+}
+
+
+static int vidioc_decoder_cmd(struct file *file, void *priv,
+                               struct v4l2_decoder_cmd *cmd)
+{
+       struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
+       struct vb2_queue *src_vq, *dst_vq;
+       int ret;
+
+       ret = vidioc_try_decoder_cmd(file, priv, cmd);
+       if (ret)
+               return ret;
+
+       mtk_v4l2_debug(1, "decoder cmd=%u", cmd->cmd);
+       dst_vq = v4l2_m2m_get_vq(ctx->m2m_ctx,
+                               V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
+       switch (cmd->cmd) {
+       case V4L2_DEC_CMD_STOP:
+               src_vq = v4l2_m2m_get_vq(ctx->m2m_ctx,
+                               V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE);
+               if (!vb2_is_streaming(src_vq)) {
+                       mtk_v4l2_debug(1, "Output stream is off. No need to 
flush.");
+                       return 0;
+               }
+               if (!vb2_is_streaming(dst_vq)) {
+                       mtk_v4l2_debug(1, "Capture stream is off. No need to 
flush.");
+                       return 0;
+               }
+               v4l2_m2m_buf_queue(ctx->m2m_ctx, &ctx->empty_flush_buf->vb);
+               v4l2_m2m_try_schedule(ctx->m2m_ctx);
+               break;
+
+       case V4L2_DEC_CMD_START:
+               vb2_clear_last_buffer_dequeued(dst_vq);
+               break;
+
+       default:
+               return -EINVAL;
+       }
+
+       return 0;
+}
+
 void mtk_vdec_unlock(struct mtk_vcodec_ctx *ctx)
 {
        mutex_unlock(&ctx->dev->dec_mutex);
@@ -521,10 +579,6 @@ 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_dec_buf *mtkbuf;
-       struct vb2_v4l2_buffer  *vb2_v4l2;
 
        if (ctx->state == MTK_STATE_ABORT) {
                mtk_v4l2_err("[%d] Call on QBUF after unrecoverable error",
@@ -532,25 +586,6 @@ static int vidioc_vdec_qbuf(struct file *file, void *priv,
                return -EIO;
        }
 
-       vq = v4l2_m2m_get_vq(ctx->m2m_ctx, buf->type);
-       if (buf->index >= vq->num_buffers) {
-               mtk_v4l2_debug(1, "buffer index %d out of range", buf->index);
-               return -EINVAL;
-       }
-       vb = vq->bufs[buf->index];
-       vb2_v4l2 = container_of(vb, struct vb2_v4l2_buffer, vb2_buf);
-       mtkbuf = container_of(vb2_v4l2, struct mtk_video_dec_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->id, 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);
 }
 
@@ -1067,10 +1102,8 @@ static void vb2ops_vdec_buf_queue(struct vb2_buffer *vb)
        int ret = 0;
        unsigned int dpbsize = 1;
        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_dec_buf *buf = container_of(vb2_v4l2,
-                               struct mtk_video_dec_buf, vb);
+       struct vb2_v4l2_buffer *vb2_v4l2 = NULL;
+       struct mtk_video_dec_buf *buf = NULL;
 
        mtk_v4l2_debug(3, "[%d] (%d) id=%d, vb=%p",
                        ctx->id, vb->vb2_queue->type,
@@ -1079,10 +1112,11 @@ static void vb2ops_vdec_buf_queue(struct vb2_buffer *vb)
         * check if this buffer is ready to be used after decode
         */
        if (vb->vb2_queue->type != V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
+               vb2_v4l2 = to_vb2_v4l2_buffer(vb);
+               buf = container_of(vb2_v4l2, struct mtk_video_dec_buf, vb);
                mutex_lock(&ctx->lock);
                if (buf->used == false) {
-                       v4l2_m2m_buf_queue(ctx->m2m_ctx,
-                                       to_vb2_v4l2_buffer(vb));
+                       v4l2_m2m_buf_queue(ctx->m2m_ctx, vb2_v4l2);
                        buf->queued_in_vb2 = true;
                        buf->queued_in_v4l2 = true;
                        buf->ready_to_display = false;
@@ -1095,7 +1129,7 @@ static void vb2ops_vdec_buf_queue(struct vb2_buffer *vb)
                return;
        }
 
-       v4l2_m2m_buf_queue(ctx->m2m_ctx, vb2_v4l2);
+       v4l2_m2m_buf_queue(ctx->m2m_ctx, to_vb2_v4l2_buffer(vb));
 
        if (ctx->state != MTK_STATE_INIT) {
                mtk_v4l2_debug(3, "[%d] already init driver %d",
@@ -1108,6 +1142,14 @@ static void vb2ops_vdec_buf_queue(struct vb2_buffer *vb)
                mtk_v4l2_err("No src buffer");
                return;
        }
+       vb2_v4l2 = to_vb2_v4l2_buffer(src_buf);
+       buf = container_of(vb2_v4l2, struct mtk_video_dec_buf, vb);
+       if (buf->lastframe) {
+               /* This shouldn't happen. Just in case. */
+               mtk_v4l2_err("Invalid flush buffer.");
+               v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
+               return;
+       }
 
        src_mem.va = vb2_plane_vaddr(src_buf, 0);
        src_mem.dma_addr = vb2_dma_contig_plane_dma_addr(src_buf, 0);
@@ -1224,9 +1266,15 @@ static void vb2ops_vdec_stop_streaming(struct vb2_queue 
*q)
                        ctx->id, q->type, ctx->state, ctx->decoded_frame_cnt);
 
        if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
-               while ((src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx)))
-                       v4l2_m2m_buf_done(to_vb2_v4l2_buffer(src_buf),
-                                       VB2_BUF_STATE_ERROR);
+               while ((src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx))) {
+                       struct vb2_v4l2_buffer *vb2_v4l2 =
+                                       to_vb2_v4l2_buffer(src_buf);
+                       struct mtk_video_dec_buf *buf_info = container_of(
+                                       vb2_v4l2, struct mtk_video_dec_buf, vb);
+                       if (!buf_info->lastframe)
+                               v4l2_m2m_buf_done(vb2_v4l2,
+                                               VB2_BUF_STATE_ERROR);
+               }
                return;
        }
 
@@ -1406,6 +1454,9 @@ const struct v4l2_ioctl_ops mtk_vdec_ioctl_ops = {
        .vidioc_unsubscribe_event       = v4l2_event_unsubscribe,
        .vidioc_g_selection             = vidioc_vdec_g_selection,
        .vidioc_s_selection             = vidioc_vdec_s_selection,
+
+       .vidioc_decoder_cmd = vidioc_decoder_cmd,
+       .vidioc_try_decoder_cmd = vidioc_try_decoder_cmd,
 };
 
 int mtk_vcodec_dec_queue_init(void *priv, struct vb2_queue *src_vq,
diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c 
b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
index d48287c..4334b73 100644
--- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
@@ -105,13 +105,21 @@ static int fops_vcodec_open(struct file *file)
 {
        struct mtk_vcodec_dev *dev = video_drvdata(file);
        struct mtk_vcodec_ctx *ctx = NULL;
+       struct mtk_video_dec_buf *mtk_buf = NULL;
        int ret = 0;
+       struct vb2_queue *src_vq;
 
        ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
        if (!ctx)
                return -ENOMEM;
+       mtk_buf = kzalloc(sizeof(*mtk_buf), GFP_KERNEL);
+       if (!mtk_buf) {
+               kfree(ctx);
+               return -ENOMEM;
+       }
 
        mutex_lock(&dev->dev_mutex);
+       ctx->empty_flush_buf = mtk_buf;
        ctx->id = dev->id_counter++;
        v4l2_fh_init(&ctx->fh, video_devdata(file));
        file->private_data = &ctx->fh;
@@ -135,6 +143,10 @@ static int fops_vcodec_open(struct file *file)
                        ret);
                goto err_m2m_ctx_init;
        }
+       src_vq = v4l2_m2m_get_vq(ctx->m2m_ctx,
+                               V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE);
+       ctx->empty_flush_buf->vb.vb2_buf.vb2_queue = src_vq;
+       ctx->empty_flush_buf->lastframe = true;
        mtk_vcodec_dec_set_default_params(ctx);
 
        if (v4l2_fh_is_singular(&ctx->fh)) {
@@ -173,6 +185,7 @@ static int fops_vcodec_open(struct file *file)
 err_ctrls_setup:
        v4l2_fh_del(&ctx->fh);
        v4l2_fh_exit(&ctx->fh);
+       kfree(ctx->empty_flush_buf);
        kfree(ctx);
        mutex_unlock(&dev->dev_mutex);
 
@@ -203,6 +216,7 @@ static int fops_vcodec_release(struct file *file)
        v4l2_ctrl_handler_free(&ctx->ctrl_hdl);
 
        list_del_init(&ctx->list);
+       kfree(ctx->empty_flush_buf);
        kfree(ctx);
        mutex_unlock(&dev->dev_mutex);
        return 0;
diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h 
b/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
index d7eb8ef..3cffb38 100644
--- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
@@ -254,6 +254,7 @@ struct vdec_pic_info {
  * @decode_work: worker for the decoding
  * @encode_work: worker for the encoding
  * @last_decoded_picinfo: pic information get from latest decode
+ * @empty_flush_buf: a fake size-0 capture buffer that indicates flush
  *
  * @colorspace: enum v4l2_colorspace; supplemental to pixelformat
  * @ycbcr_enc: enum v4l2_ycbcr_encoding, Y'CbCr encoding
@@ -291,6 +292,7 @@ struct mtk_vcodec_ctx {
        struct work_struct decode_work;
        struct work_struct encode_work;
        struct vdec_pic_info last_decoded_picinfo;
+       struct mtk_video_dec_buf *empty_flush_buf;
 
        enum v4l2_colorspace colorspace;
        enum v4l2_ycbcr_encoding ycbcr_enc;
-- 
2.8.0.rc3.226.g39d4020

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