linux-kernel - [PATCH 8/8] media: cedrus: Add support for V4L2_DEC_CMD

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Date:   Thu, 22 Aug 2019 21:45:00 +0200
From:   Jernej Skrabec <jernej.skrabec@...l.net>
To:     mchehab@...nel.org, hverkuil-cisco@...all.nl,
        paul.kocialkowski@...tlin.com, mripard@...nel.org
Cc:     pawel@...iak.com, m.szyprowski@...sung.com,
        kyungmin.park@...sung.com, tfiga@...omium.org, wens@...e.org,
        acourbot@...omium.org, gregkh@...uxfoundation.org,
        jernej.skrabec@...l.net, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-arm-kernel@...ts.infradead.org, ezequiel@...labora.com,
        jonas@...boo.se
Subject: [PATCH 8/8] media: cedrus: Add support for V4L2_DEC_CMD_FLUSH

This command is useful for explicitly flushing last decoded frame.

Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.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