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| author |   Paul Mackerras <paulus@samba.org> | 2007-02-07 14:05:13 +1100 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2007-02-07 14:05:13 +1100 |
| commit | 8423200553113cc031caa9b147f6150a8e26545c (patch) | |
| tree | 752c93a200c9ba056c7469c96f7e27d02c99291d /arch/arm/mach-imx/cpufreq.c | |
| parent | [POWERPC] Make pSeries use the H_BULK_REMOVE hypervisor call (diff) | |
| parent | Linux 2.6.20 (diff) | |
| download | linux-dev-8423200553113cc031caa9b147f6150a8e26545c.tar.xz linux-dev-8423200553113cc031caa9b147f6150a8e26545c.zip | |
Merge branch 'linux-2.6'
Diffstat (limited to 'arch/arm/mach-imx/cpufreq.c')
| -rw-r--r-- | arch/arm/mach-imx/cpufreq.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/arch/arm/mach-imx/cpufreq.c b/arch/arm/mach-imx/cpufreq.c index ac5f99895660..4f66e90db74f 100644 --- a/arch/arm/mach-imx/cpufreq.c +++ b/arch/arm/mach-imx/cpufreq.c @@ -184,6 +184,17 @@ static int imx_set_target(struct cpufreq_policy *policy, long sysclk; unsigned int bclk_div = 1; + /* + * Some governors do not respects CPU and policy lower limits + * which leads to bad things (division by zero etc), ensure + * that such things do not happen. + */ + if(target_freq < policy->cpuinfo.min_freq) + target_freq = policy->cpuinfo.min_freq; + + if(target_freq < policy->min) + target_freq = policy->min; + freq = target_freq * 1000; pr_debug(KERN_DEBUG "imx: requested frequency %ld Hz, mpctl0 at boot 0x%08x\n", @@ -258,7 +269,8 @@ static int __init imx_cpufreq_driver_init(struct cpufreq_policy *policy) policy->governor = CPUFREQ_DEFAULT_GOVERNOR; policy->cpuinfo.min_freq = 8000; policy->cpuinfo.max_freq = 200000; - policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; + /* Manual states, that PLL stabilizes in two CLK32 periods */ + policy->cpuinfo.transition_latency = 4 * 1000000000LL / CLK32; return 0; } |