lkml.org 
[lkml]   [2014]   [May]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [RFC PATCH 0/5] Frequency resolution in CCF vs. cpufreq
From
On 15 May 2014 04:00, Soren Brinkmann <soren.brinkmann@xilinx.com> wrote:
> I have one or two problems with cpufreq and the CCF, which are caused by
> rounding/different frequency resolutions.
>
> cpufreq works with kHz, while the CCF uses Hz. On Zynq our default frequency is
> 666666666 Hz which the CCF, due to rounding, reports as 666666660. And for
> cpufreq, which simply divides values it obtains through clk_round_rate() by
> 1000, 666666.
> Since passing 666666 to clk_round_rate() does not result in 666666660
> (clk_round_rate() always rounds down!), we chose to put 666667 in the OPP. This
> causes issue 1: cpufreq stats are broken.

I know it might a big exercise, but wouldn't it be worth to make cpufreq start
using frequencies in Hz ?


\
 
 \ /
  Last update: 2014-05-15 09:01    [W:0.118 / U:0.736 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site