Re: OMAPDSS: DISPC: horizontal timing too tight errors

[Ivaylo Dimitrov]

On 07.01.2014 20:05, Pavel Machek wrote:
> On Tue 2014-01-07 14:35:02, Tomi Valkeinen wrote:
> > On 2014-01-06 11:43, Ivaylo Dimitrov wrote:
> > > Hi,
> > >
> > > commit 7faa92339bbb1e6b9a80983b206642517327eb75 "OMAPDSS: DISPC: Handle
> > > synclost errors in OMAP3" introduces some limits check to prevent
> > > SYNCLOST errors on OMAP3 in a specific usecase. The problem I see here
> > > (on Nokia N900, Maemo 5, linux 3.13-rc6, DSP accel video decoding) is
> > > that those checks effectively prevent fullscreen video playback of
> > > anything above lets say 640x350 with "horizontal timing too tight"
> > > errors spit in dmesg log. If I hack check_horiz_timing_omap3 function to
> > > always return true, I can happily play videos up to (and including) 720p
> > > resolutions, with no SYNCLOST errors.
> >
> > I never worked with the patch in question, but my understanding is that
> > the core issue is quite difficult to solve optimally for all cases.
> > There are so many variables involved. So it may well be that the patch
> > in question does it a bit over-safely. Then again, it might as well have
> > a bug =).
>
> Can we simply revert 7faa92339bbb1e6b9a80983b206642517327eb75 ?
>
> Working around undocumented problems on unspecified machine, but
> breaking configuration people actually use seems like a bad idea.
>
> 									Pavel
The similar code exists in both omap1(N900 stock) and N9 kernels, I 
guess there is some other bug (somewhere else), trying to find it as we 
speak :)

Ivo
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