anyone knows which kernel version supports dma_buf for v4l2src?

[Sebastian Dröge]

On Do, 2013-12-05 at 09:36 +0000, Zhao, Halley wrote:
> Thanks Dröge.
> I use Ubuntu13.10 kernel (3.11) with USB camera.
> 
> Refer to https://bugzilla.gnome.org/show_bug.cgi?id=699337 
> 1. I think my kernel and uvc driver supports dma_buffer.
> 	It also works when I queue (VIDIOC_QBUF) an external dma_buf fd (from drm). It is an alternative way for USER_PTR, right?

Yes, it's a general interface to allow passing arbitrary memory handles
between different devices.

> 2. does it mean UVC driver support importing external dma buf only, while not able to export dma_buf? or said not support the way like MMAP.

That's possible, yes.

-- 
Sebastian Dröge <sebastian at centricular.com>
Centricular Ltd - http://www.centricular.com
Expertise, Straight from the Source
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