linux-kernel - Re: [PATCH v2 2/2] clk: vt8500: rework wm8650_find_pll

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Message-ID: <20160621004846.GL1521@codeaurora.org>
Date:	Mon, 20 Jun 2016 17:48:46 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Roman Volkov <v1ron@...l.ru>
Cc:	Arnd Bergmann <arnd@...db.de>, linux-clk@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Michael Turquette <mturquette@...libre.com>,
	Roman Volkov <rvolkov@...os.org>,
	Tony Prisk <linux@...sktech.co.nz>
Subject: Re: [PATCH v2 2/2] clk: vt8500: rework wm8650_find_pll_bits()

On 06/08, Roman Volkov wrote:
> From: Roman Volkov <rvolkov@...os.org>
> 
> PLL clock on WM8650 is calculated in the following way:
> 
> M * parent [O1] => / P [O2] => / D [O3]
> 
> Where O2 is 600MHz >= (M * parent) / P >= 300MHz.
> 
> Current algorithm does not met this requirement, so that the
> function may return rates which are not supported by the hardware.
> 
> This patch fixes the algorithm and simplifies the code, reducing
> the calculation time by ~10000 times (according to usermode app) by
> removing the nested loops.
> 
> Signed-off-by: Roman Volkov <rvolkov@...os.org>
> ---

Applied to clk-next

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