Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit e3f91ca4 authored by Haavard Skinnemoen's avatar Haavard Skinnemoen
Browse files

avr32: Scale loops_per_jiffy when cpu frequency changes 



The loops_per_jiffy variable isn't updated when cpufreq changes the CPU
frequency. This could cause udelay() and friends to produce wrong
delays.

Signed-off-by: default avatarHaavard Skinnemoen <haavard.skinnemoen@atmel.com>
parent 60900656

arch/avr32/mach-at32ap/cpufreq.c

+14 −0
Original line number Diff line number Diff line
@@ -40,6 +40,9 @@ static unsigned int at32_get_speed(unsigned int cpu) 
	return (unsigned int)((clk_get_rate(cpuclk) + 500) / 1000);

}



static unsigned int	ref_freq;

static unsigned long	loops_per_jiffy_ref;



static int at32_set_target(struct cpufreq_policy *policy,

			  unsigned int target_freq,

			  unsigned int relation)
@@ -61,8 +64,19 @@ static int at32_set_target(struct cpufreq_policy *policy, 
	freqs.cpu = 0;

	freqs.flags = 0;



	if (!ref_freq) {

		ref_freq = freqs.old;

		loops_per_jiffy_ref = boot_cpu_data.loops_per_jiffy;

	}



	cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);

	if (freqs.old < freqs.new)

		boot_cpu_data.loops_per_jiffy = cpufreq_scale(

				loops_per_jiffy_ref, ref_freq, freqs.new);

	clk_set_rate(cpuclk, freq);

	if (freqs.new < freqs.old)

		boot_cpu_data.loops_per_jiffy = cpufreq_scale(

				loops_per_jiffy_ref, ref_freq, freqs.new);

	cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);



	pr_debug("cpufreq: set frequency %lu Hz\n", freq);