On 02/20/2016 10:11 AM, tiffany lin wrote:

Hi Hans,

On Tue, 2016-02-16 at 08:44 +0100, Hans Verkuil wrote:

quoted

On 02/16/2016 07:37 AM, tiffany lin wrote:

quoted

quoted

quoted

+
+const struct v4l2_ioctl_ops mtk_venc_ioctl_ops = {
+	.vidioc_streamon		= v4l2_m2m_ioctl_streamon,
+	.vidioc_streamoff		= v4l2_m2m_ioctl_streamoff,
+
+	.vidioc_reqbufs			= v4l2_m2m_ioctl_reqbufs,
+	.vidioc_querybuf		= v4l2_m2m_ioctl_querybuf,
+	.vidioc_qbuf			= vidioc_venc_qbuf,
+	.vidioc_dqbuf			= vidioc_venc_dqbuf,
+
+	.vidioc_querycap		= vidioc_venc_querycap,
+	.vidioc_enum_fmt_vid_cap_mplane = vidioc_enum_fmt_vid_cap_mplane,
+	.vidioc_enum_fmt_vid_out_mplane = vidioc_enum_fmt_vid_out_mplane,
+	.vidioc_enum_framesizes		= vidioc_enum_framesizes,
+
+	.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_expbuf			= v4l2_m2m_ioctl_expbuf,

Please add vidioc_create_bufs and vidioc_prepare_buf as well.

Currently we do not support these use cases, do we need to add
vidioc_create_bufs and vidioc_prepare_buf now?

I would suggest you do. The vb2 framework gives it (almost) for free.
prepare_buf is completely free (just add the helper) and create_bufs
needs a few small changes in the queue_setup function, that's all.

After try to add vidioc_create_bufs directly using
vb2_ioctl_create_bufs, it will have problem in 

This is a m2m device, so you should use the m2m variant of this:
v4l2_m2m_ioctl_create_bufs

That should solve this problem.

Ditto for prepare_buf: you need to use v4l2_m2m_ioctl_prepare_buf.

Regards,

	Hans