linux-kernel - Re: RE: [PATCH] clk: samsung: Fix pll36xx_recalc

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Date:	Mon, 10 Jun 2013 15:16:05 -0700
From:	Mike Turquette <mturquette@...aro.org>
To:	Kukjin Kim <kgene.kim@...sung.com>,
	'Doug Anderson' <dianders@...omium.org>
Cc:	'Tomasz Figa' <tomasz.figa@...il.com>,
	'Thomas Abraham' <thomas.abraham@...aro.org>,
	'Olof Johansson' <olof@...om.net>,
	'Vikas Sajjan' <vikas.sajjan@...aro.org>,
	'Yadwinder Singh Brar' <yadi.brar01@...il.com>,
	'linux-samsung-soc' <linux-samsung-soc@...r.kernel.org>,
	'Tomasz Figa' <t.figa@...sung.com>,
	linux-kernel@...r.kernel.org
Subject: Re: RE: [PATCH] clk: samsung: Fix pll36xx_recalc_rate to handle kdiv properly

Quoting Kukjin Kim (2013-06-05 04:51:29)
> Doug Anderson wrote:
> > 
> > The KDIV value is often listed as unsigned but it needs to be treated
> > as a 16-bit signed value when using it in calculations.  Fix our rate
> > recalculation to do this correctly.
> > 
> > Before doing this, I tried setting EPLL on exynos5250 to:
> >   rate, m, p, s, k = 80000000, 107, 2, 4, 43691
> > 
> > This rate is exactly from the table in the exynos5250 user manual.
> > 
> > I read this back as 80750003 with:
> >   cat /sys/kernel/debug/clk/fin_pll/fout_epll/clk_rate
> > 
> > After this patch, it reads back as 80000003
> > 
> >   mw 0x10020130 a06b0204
> >   mw 0x10020134 0000aaab
> > 
> > Signed-off-by: Doug Anderson <dianders@...omium.org>
> 
> Yeah,
> 
> Acked-by: Kukjin Kim <kgene.kim@...sung.com>
> 
> Mike, please apply in your fixes.
> 
> Thanks.
> 
> - Kukjin
> 
> > ---
> > This patch is based upon another in-flight patch to avoid conflicts:
> >   clk: samsung: Use clk->base instead of directly using clk->con0 for
> > PLL3xxx
> >   https://patchwork.kernel.org/patch/2629751/

The dependency series is not destined for clk-fixes but Kukjin has
requested this patch as a fix.  If you want this patch as a fix can you
rebase it against:

git://git.linaro.org/people/mturquette/linux.git clk-fixes

Thanks,
Mike

> > 
> >  drivers/clk/samsung/clk-pll.c | 5 +++--
> >  1 file changed, 3 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/clk/samsung/clk-pll.c b/drivers/clk/samsung/clk-pll.c
> > index 01f17cf..26416bb 100644
> > --- a/drivers/clk/samsung/clk-pll.c
> > +++ b/drivers/clk/samsung/clk-pll.c
> > @@ -115,7 +115,8 @@ static unsigned long
> > samsung_pll36xx_recalc_rate(struct clk_hw *hw,
> >                               unsigned long parent_rate)
> >  {
> >       struct samsung_clk_pll *pll = to_clk_pll(hw);
> > -     u32 mdiv, pdiv, sdiv, kdiv, pll_con0, pll_con1;
> > +     u32 mdiv, pdiv, sdiv, pll_con0, pll_con1;
> > +     s16 kdiv;
> >       u64 fvco = parent_rate;
> > 
> >       pll_con0 = pll_readl(pll, PLL36XX_CON0_OFFSET);
> > @@ -123,7 +124,7 @@ static unsigned long
> > samsung_pll36xx_recalc_rate(struct clk_hw *hw,
> >       mdiv = (pll_con0 >> PLL36XX_MDIV_SHIFT) & PLL36XX_MDIV_MASK;
> >       pdiv = (pll_con0 >> PLL36XX_PDIV_SHIFT) & PLL36XX_PDIV_MASK;
> >       sdiv = (pll_con0 >> PLL36XX_SDIV_SHIFT) & PLL36XX_SDIV_MASK;
> > -     kdiv = pll_con1 & PLL36XX_KDIV_MASK;
> > +     kdiv = (s16)(pll_con1 & PLL36XX_KDIV_MASK);
> > 
> >       fvco *= (mdiv << 16) + kdiv;
> >       do_div(fvco, (pdiv << sdiv));
> > --
> > 1.8.2.1
--
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