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Groups > linux.kernel > #1700370
| From | Stephen Boyd <sboyd@codeaurora.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH] clk: samsung: exynos5420: The EPLL rate table corrections |
| Date | 2017-07-31 22:20 +0200 |
| Message-ID | <u9pku-2jJ-21@gated-at.bofh.it> (permalink) |
| References | <u5Ei6-4ce-27@gated-at.bofh.it> <u5Ei6-4ce-25@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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@samsung.com>
> ---
Applied to clk-fixes
--
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[PATCH] clk: samsung: exynos5420: The EPLL rate table corrections Sylwester Nawrocki <s.nawrocki@samsung.com> - 2017-07-21 13:30 +0200
Re: [PATCH] clk: samsung: exynos5420: The EPLL rate table corrections Sylwester Nawrocki <s.nawrocki@samsung.com> - 2017-07-31 14:30 +0200
Re: [PATCH] clk: samsung: exynos5420: The EPLL rate table corrections Stephen Boyd <sboyd@codeaurora.org> - 2017-07-31 22:20 +0200
Re: [PATCH] clk: samsung: exynos5420: The EPLL rate table corrections Sylwester Nawrocki <s.nawrocki@samsung.com> - 2017-08-01 12:20 +0200
Re: [PATCH] clk: samsung: exynos5420: The EPLL rate table corrections Stephen Boyd <sboyd@codeaurora.org> - 2017-07-31 22:20 +0200
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