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

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Date:   Fri, 15 Dec 2017 08:12:58 +0000
From:   Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        David Airlie <airlied@...ux.ie>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/2] drm: rcar-du: calculate DPLLCR to be more small jitter


Hi Geert

> > From: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
> > 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