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Commit 7998a878 authored by Graf Yang's avatar Graf Yang Committed by Mike Frysinger
Browse files

Blackfin: scale calibration when cpu freq changes 



Need to make sure we update the loops_per_jiffy values when we start
changing the core clock.

Signed-off-by: default avatarGraf Yang <graf.yang@analog.com>
Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
parent f2b0cd61

arch/blackfin/mach-common/cpufreq.c

+12 −1
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 
#include <linux/init.h>

#include <linux/cpufreq.h>

#include <linux/fs.h>

#include <linux/delay.h>

#include <asm/blackfin.h>

#include <asm/time.h>

#include <asm/dpmc.h>
@@ -99,13 +100,15 @@ static unsigned int bfin_getfreq_khz(unsigned int cpu) 
	return get_cclk() / 1000;

}





static int bfin_target(struct cpufreq_policy *poli,

			unsigned int target_freq, unsigned int relation)

{

	unsigned int index, plldiv, cpu;

	unsigned long flags, cclk_hz;

	struct cpufreq_freqs freqs;

	static unsigned long lpj_ref;

	static unsigned int  lpj_ref_freq;



#if defined(CONFIG_CYCLES_CLOCKSOURCE)

	cycles_t cycles;

#endif
@@ -144,6 +147,14 @@ static int bfin_target(struct cpufreq_policy *poli, 
			    (cycles << __bfin_cycles_mod) - (cycles << index);

			__bfin_cycles_mod = index;

#endif

			if (!lpj_ref_freq) {

				lpj_ref = loops_per_jiffy;

				lpj_ref_freq = freqs.old;

			}

			if (freqs.new != freqs.old) {

				loops_per_jiffy = cpufreq_scale(lpj_ref,

						lpj_ref_freq, freqs.new);

			}

			local_irq_restore_hw(flags);

		}

		/* TODO: just test case for cycles clock source, remove later */