Re: [PATCH 4/6] ARM: dts: da850-lcdk: add support for 1024x768 resolution

[Karl Beldan]

On Fri, Sep 30, 2016 at 11:37:57AM +0200, Bartosz Golaszewski wrote:
> 2016-09-29 20:58 GMT+02:00 Karl Beldan <karl.beldan@xxxxxxxxx>:
> > Hi,
> >
> > On Thu, Sep 29, 2016 at 06:31:53PM +0200, Bartosz Golaszewski wrote:
> >> Add svga timings for 1024x768 resolution to the da850-lcdk
> >> device tree.
> >>
> >
> 
> [snip]
> 
> >
> > Why do you also call 1024x768 svga ?
> >
> 
> Thanks, should have been xga. will fix in v2.
> 
> > I don't think the LCDK can cope with this resolution at this frequency
> > (in terms of mem bandwidth), at least that's what I observed back in
> > August. If confirmed I think it is worth mentioning in the log at least,
> > but then I doubt adding this config would be useful.
> >
> 
> Thanks for the heads up. How would that manifest itself? This seems to
> work fine for me - I'm not getting any warnings on a simple system -
> maybe if I added some additional memory load it would complain.
> 

A mere dmesg > /dev/tty0 (or repeatedly cat-ting a file to /dev/tty0)
should suffice to make the issue visible and trigger FIFO underflows.

Regards, 
Karl