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@xxxxxxxxxxx> > >>>> > >>>> 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
