From: Viresh Kumar <viresh.kumar@linaro.org>
To: vichy <vichy.kuo@gmail.com>
Cc: "cpufreq@vger.kernel.org" <cpufreq@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Linux PM list <linux-pm@vger.kernel.org>
Subject: Re: about system time incorrect after changing cpu frequency
Date: Tue, 1 Sep 2015 11:32:36 +0530 [thread overview]
Message-ID: <20150901060236.GB1456@linux> (raw)
In-Reply-To: <CAOVJa8HNQ-s=yDfADCcoL+r22ALpHFtTjWZ=oxTkBUriYbCk+Q@mail.gmail.com>
On 01-09-15, 13:36, vichy wrote:
> >> I try to call below 2 functions to change the frequency of clocksource
> >> and clockevent, but the above b) sleep time is still incorrect when
> >> cpu runs in 500Mhz.
> >> clockevents_update_freq(this_cpu_ptr(gt_evt), gt_clk_rate);
> >> __clocksource_updatefreq_hz(>_clocksource, gt_clk_rate);
How and when were you calling them? What kernel version is it ?
> Clock Event Device: arm_global_timer
This driver doesn't have support to update clkevt device's freq. You
may need to modify that based on how arch/arm/kernel/smp_twd.c is
updated. look for: clockevents_update_freq().
--
viresh
next prev parent reply other threads:[~2015-09-01 6:02 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAOVJa8GTDj3UJpgUd4nH1wknUKa6fgac=1SsqC8g=UCG0MGuDw@mail.gmail.com>
2015-09-01 3:57 ` about system time incorrect after changing cpu frequency Viresh Kumar
2015-09-01 5:36 ` vichy
2015-09-01 6:02 ` Viresh Kumar [this message]
2015-09-01 6:39 ` Jisheng Zhang
2015-09-01 7:37 ` vichy
2015-09-01 7:21 ` vichy
2015-09-01 7:42 ` Viresh Kumar
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