[PATCH 8/8] media: cedrus: Add support for V4L2_DEC_CMD_FLUSH

[Jernej Skrabec]

This command is useful for explicitly flushing last decoded frame.

Signed-off-by: Jernej Skrabec <jernej.skra...@siol.net>
---
 .../staging/media/sunxi/cedrus/cedrus_video.c | 34 +++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_video.c 
b/drivers/staging/media/sunxi/cedrus/cedrus_video.c
index 5153b2bba21e..9eae69d5741c 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_video.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_video.c
@@ -331,6 +331,37 @@ static int cedrus_s_fmt_vid_out(struct file *file, void 
*priv,
        return 0;
 }
 
+static int cedrus_try_decoder_cmd(struct file *file, void *fh,
+                                 struct v4l2_decoder_cmd *dc)
+{
+       if (dc->cmd != V4L2_DEC_CMD_FLUSH)
+               return -EINVAL;
+
+       return 0;
+}
+
+static int cedrus_decoder_cmd(struct file *file, void *fh,
+                             struct v4l2_decoder_cmd *dc)
+{
+       struct cedrus_ctx *ctx = cedrus_file2ctx(file);
+       struct vb2_v4l2_buffer *out_vb, *cap_vb;
+       int ret;
+
+       ret = cedrus_try_decoder_cmd(file, fh, dc);
+       if (ret < 0)
+               return ret;
+
+       out_vb = v4l2_m2m_last_src_buf(ctx->fh.m2m_ctx);
+       cap_vb = v4l2_m2m_last_dst_buf(ctx->fh.m2m_ctx);
+
+       if (out_vb)
+               out_vb->flags &= ~V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF;
+       else if (cap_vb && cap_vb->is_held)
+               v4l2_m2m_buf_done(cap_vb, VB2_BUF_STATE_DONE);
+
+       return 0;
+}
+
 const struct v4l2_ioctl_ops cedrus_ioctl_ops = {
        .vidioc_querycap                = cedrus_querycap,
 
@@ -355,6 +386,9 @@ const struct v4l2_ioctl_ops cedrus_ioctl_ops = {
        .vidioc_streamon                = v4l2_m2m_ioctl_streamon,
        .vidioc_streamoff               = v4l2_m2m_ioctl_streamoff,
 
+       .vidioc_try_decoder_cmd         = cedrus_try_decoder_cmd,
+       .vidioc_decoder_cmd             = cedrus_decoder_cmd,
+
        .vidioc_subscribe_event         = v4l2_ctrl_subscribe_event,
        .vidioc_unsubscribe_event       = v4l2_event_unsubscribe,
 };
-- 
2.22.1