[st-ericsson] v4l2 vs omx for camera

[Laurent Pinchart]

On Saturday 26 February 2011 13:12:42 Hans Verkuil wrote:
> On Friday, February 25, 2011 18:22:51 Linus Walleij wrote:
> > 2011/2/24 Edward Hervey <bilboed at gmail.com>:
> > >  What *needs* to be solved is an API for data allocation/passing at the
> > > 
> > > kernel level which v4l2,omx,X,GL,vdpau,vaapi,... can use and that
> > > userspace (like GStreamer) can pass around, monitor and know about.
> > 
> > I think the patches sent out from ST-Ericsson's Johan Mossberg to
> > linux-mm for "HWMEM" (hardware memory) deals exactly with buffer
> > passing, pinning of buffers and so on. The CMA (Contigous Memory
> > Allocator) has been slightly modified to fit hand-in-glove with HWMEM,
> > so CMA provides buffers, HWMEM pass them around.
> > 
> > Johan, when you re-spin the HWMEM patchset, can you include
> > linaro-dev and linux-media in the CC?
> 
> Yes, please. This sounds promising and we at linux-media would very much
> like to take a look at this. I hope that the CMA + HWMEM combination is
> exactly what we need.

Once again let me restate what I've been telling for some time: CMA must be 
*optional*. Not all hardware need contiguous memory. I'll have a look at the 
next HWMEM version.

-- 
Regards,

Laurent Pinchart