Re: [PATCH v2 1/1] video_video: Add the Virtio Video V4L2 driver

Dmitry Sepp
2020-03-12T11:48:56Z

Hi Hans,

One more thing:

> GFP_DMA? That's unusual. I'd expect GFP_DMA32. All V4L2 drivers use that.

GFP_DMA32 had no effect for me on arm64. Probably I need to recheck.

Best regards,
Dmitry.

On Donnerstag, 12. März 2020 11:18:26 CET Hans Verkuil wrote:
> On 3/12/20 11:15 AM, Dmitry Sepp wrote:
> > Hi Hans,
> >
> > Thank you for your great detailed review!
> >
> > I won't provide inline answers as your comments totally make sense. There
> > is>
> > only one thing I want to mention:
> >>> + struct video_plane_format plane_format[VIRTIO_VIDEO_MAX_PLANES];
> >>
> >> Why is this virtio specific? Any reason for not using VIDEO_MAX_PLANES?
> >
> > I'd say this is because VIDEO_MAX_PLANES does not exist outside of the
> > Linux OS, so for whatever other system we need a virtio specific
> > definition.
> OK, good reason :-)
>
> It's probably a good thing to add a comment where VIRTIO_VIDEO_MAX_PLANES is
> defined that explains this.
>
> Regards,
>
> Hans