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: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
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@ -40,6 +40,9 @@ static unsigned int at32_get_speed(unsigned int cpu)
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return (unsigned int)((clk_get_rate(cpuclk) + 500) / 1000);
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}
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static unsigned int ref_freq;
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static unsigned long loops_per_jiffy_ref;
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static int at32_set_target(struct cpufreq_policy *policy,
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unsigned int target_freq,
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unsigned int relation)
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@ -61,8 +64,19 @@ static int at32_set_target(struct cpufreq_policy *policy,
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freqs.cpu = 0;
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freqs.flags = 0;
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if (!ref_freq) {
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ref_freq = freqs.old;
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loops_per_jiffy_ref = boot_cpu_data.loops_per_jiffy;
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}
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cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
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if (freqs.old < freqs.new)
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boot_cpu_data.loops_per_jiffy = cpufreq_scale(
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loops_per_jiffy_ref, ref_freq, freqs.new);
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clk_set_rate(cpuclk, freq);
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if (freqs.new < freqs.old)
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boot_cpu_data.loops_per_jiffy = cpufreq_scale(
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loops_per_jiffy_ref, ref_freq, freqs.new);
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cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
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pr_debug("cpufreq: set frequency %lu Hz\n", freq);
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