linux-kernel - Re: [PATCH v4 03/26] clk: sunxi-ng: Add check for maximum rate to NKM PLLs

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Date:   Tue, 20 Nov 2018 17:37:11 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, Icenowy Zheng <icenowy@...c.io>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Vasily Khoruzhick <anarsoul@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        David Airlie <airlied@...ux.ie>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        Michael Trimarchi <michael@...rulasolutions.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi@...glegroups.com, linux-amarula@...rulasolutions.com
Subject: Re: [PATCH v4 03/26] clk: sunxi-ng: Add check for maximum rate to NKM PLLs

On Tue, Nov 20, 2018 at 4:26 PM Maxime Ripard <maxime.ripard@...tlin.com> wrote:
>
> On Thu, Nov 15, 2018 at 08:51:04PM +0530, Jagan Teki wrote:
> > > >  drivers/clk/sunxi-ng/ccu_nkm.c | 3 +++
> > > >  drivers/clk/sunxi-ng/ccu_nkm.h | 1 +
> > > >  2 files changed, 4 insertions(+)
> > > >
> > > > diff --git a/drivers/clk/sunxi-ng/ccu_nkm.c b/drivers/clk/sunxi-ng/ccu_nkm.c
> > > > index 6b5ad990f802..b8b66cdd30bf 100644
> > > > --- a/drivers/clk/sunxi-ng/ccu_nkm.c
> > > > +++ b/drivers/clk/sunxi-ng/ccu_nkm.c
> > > > @@ -128,6 +128,9 @@ static unsigned long ccu_nkm_round_rate(struct ccu_mux_internal *mux,
> > > >       if (rate < nkm->min_rate)
> > > >               return nkm->min_rate;
> > > >
> > > > +     if (nkm->max_rate && rate > nkm->max_rate)
> > > > +             return nkm->max_rate;
> > > > +
> > >
> > > I would expect the test to be the same for the minimum and maximum cases.
> >
> > I don't have proper use-case for max rate test, I do verify by using
> > higher the rate on dclock, but nor sure.  May be I can skip the
> > max_rate patch?
>
> So you're sending more patches that you haven't really tested?

I didn't understand this question.

> Why are you sending them then?

I think I've mentioned in the first version patch itself, since it's
common code and many other callers might have used for rate
alternative I did it how other ccu dividers does. I have not added
just as simple.
>
> > Apart from this, any idea about this issue where SUN4I_TCON0_DCLK_REG
> > will only work with div upto 6 on A64 DSI panels[1], did you find the
> > same issue on A33?
>
> IIRC my panel was falling into the case where the divider was 4, so
> I've not fallen into that case.

OK, thanks.