Re: [PATCH v3 2/2] drm: rcar-du: calculate DPLLCR to be more small jitter

From: Kuninori Morimoto
Date: Fri Dec 15 2017 - 03:13:12 EST



Hi Geert

> > From: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
> > In general, PLL has VCO (= Voltage controlled oscillator),
> > one of the very important electronic feature called as "jitter"
> > is related to this VCO.
> > In academic generalism, VCO should be maximum to be more small jitter.
> > In high frequency clock, jitter will be large impact.
> > Thus, selecting Hi VCO is general theory.
>
> Thanks for your patch!
>
> > One note here is that it should be 2000 < fvco < 4096MHz
>
> 2000 Hz? (else it could be misinterpreted that MHz applies to both values).

Laurent had asked same question ;)
But, yes, it is 2000 Hz

Best regards
---
Kuninori Morimoto