linux-kernel - Re: [PATCH v2] clk:mxs: Fix bug on frequency divider

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Message-ID: <20151001222510.GP19319@codeaurora.org>
Date:	Thu, 1 Oct 2015 15:25:10 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Victorien Vedrine <victorien.vedrine@...rys.net>
Cc:	linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
	mturquette@...libre.com, shawn.guo@...aro.org
Subject: Re: [PATCH v2] clk:mxs: Fix bug on frequency divider

On 08/31, Victorien Vedrine wrote:
> On drivers/clk/mxs/clk-frac.c, the function clk_frac_round_rate returned a bad
> result. The division before multiplication computes a wrong value ; the
> calculation is inverted to fix the problem. The second issue is that the exact
> rate have decimals and they are truncate. The consequence is that the function
> clk_frac_set_rate (which use the result of clk_frac_round_rate) computes a
> wrong value for the register (the rate generated can be closer to the desired
> rate). The correction is : if there is decimal to the result, it is rounded to
> the next larger integer.
> On drivers/clk/mxs/clk-frac.c, the function clk_frac_recalc_rate returned
> a bad result. The multiplication is made before the division to compute a
> correct value.
> 
> Signed-off-by: Victorien Vedrine <victorien.vedrine@...rys.net>
> ---

Applied to clk-next

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