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

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Message-ID: <20170731201709.GJ2146@codeaurora.org>
Date:   Mon, 31 Jul 2017 13:17:09 -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 07/21, 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>
> ---

Applied to clk-fixes

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