linux-kernel - Re: [PATCH] clk: samsung: exynos5420: The EPLL rate table corrections

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Date:   Mon, 31 Jul 2017 13:17:01 -0700
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     Sylwester Nawrocki <s.nawrocki@...sung.com>
Cc:     mturquette@...libre.com, cw00.choi@...sung.com, krzk@...nel.org,
        linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
        b.zolnierkie@...sung.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: samsung: exynos5420: The EPLL rate table corrections

On 07/31, Sylwester Nawrocki wrote:
> On 07/21/2017 01:19 PM, Sylwester Nawrocki wrote:
> >This patch fixes values of the EPLL K coefficient and changes
> >the EPLL output frequency values to match exactly what is
> >possible to achieve with given M, P, S, K coefficients.
> >This allows to avoid rounding errors and unexpected frequency
> >being set with clk_set_rate(), due to recalc_rate returning
> >different values than the PLL rate specified in the
> >exynos5420_epll_24mhz_tbl table. E.g. this prevents a case
> >where two consecutive clk_set_rate() calls with same argument
> >result in different PLL output frequency.
> >
> >The PLL output frequencies have been calculated with formula:
> >
> >f = fxtal * (M * 2^16  + K) / (P * 2^S) / 2^16
> >
> >where fxtal = 24000000.
> >
> >Fixes: 9842452acd ("clk: samsung: exynos542x: Add EPLL rate table")
> >Signed-off-by: Sylwester Nawrocki<s.nawrocki@...sung.com>
> 
> Stephen, Mike,
> 
> Could you apply this patch directly for v4.12-rcX?
> It fixes code added in v4.12.
> 

You mean v4.13? Sure.

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