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powerpc/powermac/cpufreq_32: Set non-infinite transition time for 7447A driver 

The transition time for the 7447A is around 8ms which makes it possible
to use the ondemand governor.  This has been tested on the iBook G4
(PowerBook6,7).

Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
Tested-by: Michel Dänzer <michel@daenzer.net>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Andreas Schwab 2012-10-28 23:15:14 +00:00 committed by Benjamin Herrenschmidt
parent ec1b33dcd2
commit bb29b71937
1 changed files with 4 additions and 1 deletions
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5
arch/powerpc/platforms/powermac/cpufreq_32.c
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@ -55,6 +55,7 @@ static unsigned int low_freq;
static unsigned int hi_freq;
static unsigned int cur_freq;
static unsigned int sleep_freq;
static unsigned long transition_latency;
/*
* Different models uses different mechanisms to switch the frequency
@ -403,7 +404,7 @@ static int pmac_cpufreq_cpu_init(struct cpufreq_policy *policy)
if (policy->cpu != 0)
return -ENODEV;
policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
policy->cpuinfo.transition_latency = transition_latency;
policy->cur = cur_freq;
cpufreq_frequency_table_get_attr(pmac_cpu_freqs, policy->cpu);
@ -658,12 +659,14 @@ static int __init pmac_cpufreq_setup(void)
if (!value)
goto out;
cur_freq = (*value) / 1000;
transition_latency = CPUFREQ_ETERNAL;
/* Check for 7447A based MacRISC3 */
if (of_machine_is_compatible("MacRISC3") &&
of_get_property(cpunode, "dynamic-power-step", NULL) &&
PVR_VER(mfspr(SPRN_PVR)) == 0x8003) {
pmac_cpufreq_init_7447A(cpunode);
transition_latency = 8000000;
/* Check for other MacRISC3 machines */
} else if (of_machine_is_compatible("PowerBook3,4") ||
of_machine_is_compatible("PowerBook3,5") ||