On Fri, Jun 08, 2012 at 09:39:15AM +0200, javier Martin wrote: > Hi Robert, > > On 8 June 2012 09:26, Robert Schwebel <r.schwebel@xxxxxxxxxxxxxx> wrote: > > Hi Javier, > > > > On Fri, Jun 08, 2012 at 09:21:13AM +0200, javier Martin wrote: > >> If you refer to driver in [1] I have some concerns: i.MX27 VPU should > >> be implemented as a V4L2 mem2mem device since it gets raw pictures > >> from memory and outputs encoded frames to memory (some discussion > >> about the subject can be fond here [2]), as Exynos driver from Samsung > >> does. However, this driver you've mentioned doesn't do that: it just > >> creates several mapping regions so that the actual functionality is > >> implemented in user space by a library provided by Freescale, which > >> regarding i.MX27 it is also GPL. > >> > >> What we are trying to do is implementing all the functionality in > >> kernel space using mem2mem V4L2 framework so that it can be accepted > >> in mainline. > > > > We will work on the VPU driver and it's migration towards a proper > > mem2mem device very soon, mainly on MX53, but of course MX27 should be > > taken care of by the same driver. > > > > So I'd suggest that we coordinate that work somehow. > > Do you plan to provide both encoding and decoding support or just one of them? We have both encoding and decoding. It works on i.MX51/53, but was originally written for i.MX27 aswell. I haven't tested i.MX27 for longer now, so it might or might not work. Find the source here: git://git.pengutronix.de/git/imx/gst-plugins-fsl-vpu.git The main difference from the FSL code is that the whole VPU functionality is in a kernel module which talks (mostly) v4l2. Our next taks is to convert this into a real mem2mem device, right now it only works with the included gstreamer plugin. You'll need a small kernel patch to register the device and to add the clocks. The gstreamer plugin is in a horrible state, but with the conversion to mem2mem we hope to get rid of this entirely. Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
