[PROTO][PATCH 05/10] drm/bridge: adv7511: Add max-clock, min-vrefresh options

[Laurent Pinchart]

Hi Ulrich,

On Wednesday, 22 August 2018 12:13:59 EEST Ulrich Hecht wrote:
> On August 21, 2018 at 10:09 AM Laurent Pinchart wrote:
> > On Tuesday, 21 August 2018 11:03:45 EEST Ulrich Hecht wrote:
> >> On August 20, 2018 at 11:28 AM Laurent Pinchart wrote:
> >>> On Tuesday, 14 August 2018 16:49:59 EEST Ulrich Hecht wrote:
> >>>> From: Koji Matsuoka <koji.matsuoka.xm at renesas.com>
> >>>> 
> >>>> This patch adds the option to specify a maximal clock and a minimal
> >>>> vertical refresh rate.
> >>> 
> >>> What is this needed for ?
> >> 
> >> Somewhere in the chain there is a component that will not tolerate
> >> clocks in excess of 135 MHz; if you don't limit it, the default for a
> >> 1920x1200 display is somewhere along 148 MHz, and the HDMI signal
> >> output is invalid.
> > 
> > Do you know which component that is ?
> 
> Unfortunately not. It's not the ADV7511, though, that goes up to 225 MHz...

After investigation, it turns out that the THC63LVD1024 is the culprit, its 
datasheet reports a maximum operating frequency of 135 MHz.

Do you have any idea what the minimal refresh rate is for ?

-- 
Regards,

Laurent Pinchart