Craig Matsuura wrote:
Thanks for the quick response. Actually from my understanding on the
tearing issues (this is direct from TI Engineers), the FIFO on the OSD0
are too small when displaying at 1280x720 so there is no way to use the
OSD at 1280x720.
I think you're referring to something other than tearing. At resolutions
over around 1024x768, you'll get DMA starvation in the video output on
the OSD. This produces a really weird behavior where the OSD layer shifts
left for the rest of the frame.
We've only seen it when enabling VID0 with OSD0 and OSD1 set up as an
overlay with transparency (I forget what TI calls this mode).
There's a partial fix for both the MV and git kernels that involves
changing around the DMA priority for the video output. There's also
a 'spraa' or 'sprue' doc that discusses things on the TI web-site.
How does directfb access the dma blitting?
If memory serves, the DFB patches use /dev/mem to allocate the memory
directly by the app (instead of using cmem or the dav-dma allocation routines),
then hands the physical memory addresses to the dav-dma driver.
You'll need to configure DFB to steer clear of the RAM used by the codec
engine and DSP.
Craig
On Thursday 28 May 2009 1:48:18 pm Eric Nelson wrote:
> Hello Craig,
>
> Craig Matsuura wrote:
> > I am also curious about the progress. I am also interested in speeding
> > up blitting in directfb. I am currently on directfb 1.2, I am using the
> > fbdev not the mem mapping as I need it for an app that runs on the vid0
> > in rgb24 bit mode.
>
> The latest driver can be found in our Git repository
> (file drivers/misc/dav-dma.c)
> http://git.boundarydevices.com/git-repos?p=linux-bd
>
> > I can not run on the osd0 as resolutions higher than 640x480 on the OSD
> > will cause video tearing. I run the vid0 at 1280x720 (720p).
>
> Using DMA for blts will help with tearing, but you'll likely also need to
> sync with the vertical refresh interrupt.
>
> > I have contemplated using the /dev/mem but was unsure if it was really
> > worth the effort. I am also using the DSP with Codec Engine 2 from
TI so
> > I can not use the c64 acceleration.
>
> The "blt" operations in dav-dma should inter-operate with CE2 just fine
> without the acceleration code in DFB.
>
> > On Wednesday 02 January 2008 8:36:20 pm Sriram Neelakandan wrote:
> > > Hi Eric,
> > >
> > > I stumbled on this posting recently..
> >
> >
http://mail.directfb.org/pipermail/directfb-users/2007-November/000123.ht
> >ml
> >
> > > I am looking to use the driver ..
> > > Do u have any latest updates ?
> > > Also it will be of great help, if you could post a sample user space
> > > program, that demos the usage of your driver.
>
> Sorry for that, Sriram. I haven't had time to keep up with the Direct-FB
> mailing list and didn't notice your post.
>
> I also haven't touched base with the DFB team to know whether they've
> been keeping the DMA blt support up-to-date.
>
> When integrated with Direct-FB, the standard DFB demos will work (only
> faster).
>
> Eric
--
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Craig Matsuura - Principal Engineer
Control4
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