On 07/31/2017 10:17 PM, Stephen Boyd wrote:
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@xxxxxxxxxxx>
Stephen, Mike,
Could you apply this patch directly for v4.12-rcX?
It fixes code added in v4.12.
You mean v4.13? Sure.
Yes, apologies for confusing these numbers. Thanks for taking
care of the patch.
--
Regards,
Sylwester
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