From bb29b719372742939af05457aff1b59608764e89 Mon Sep 17 00:00:00 2001 From: Andreas Schwab Date: Sun, 28 Oct 2012 23:15:14 +0000 Subject: powerpc/powermac/cpufreq_32: Set non-infinite transition time for 7447A driver MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Tested-by: Michel Dänzer Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/platforms/powermac/cpufreq_32.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'arch/powerpc/platforms') diff --git a/arch/powerpc/platforms/powermac/cpufreq_32.c b/arch/powerpc/platforms/powermac/cpufreq_32.c index 64171198535..311b804353b 100644 --- a/arch/powerpc/platforms/powermac/cpufreq_32.c +++ b/arch/powerpc/platforms/powermac/cpufreq_32.c @@ -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") || -- cgit v1.2.3