From: Michael Hennerich Date: Fri, 25 Sep 2009 09:03:21 +0000 (+0000) Subject: Blackfin: cpufreq: use a constant latency X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=d887a1ce285f03c689bb4fbbaf574160bb484c3e;p=deliverable%2Flinux.git Blackfin: cpufreq: use a constant latency PLL_LOCKCNT applies only to the PLL programming sequence which does not apply to core and system clock dividers. Writes to PLL_DIV to change the CSEL/SSEL dividers take effect immediately. There is still overhead in software in writing the new dividers, so just use a value of 50us as this should be good enough. Signed-off-by: Michael Hennerich Signed-off-by: Mike Frysinger --- diff --git a/arch/blackfin/mach-common/cpufreq.c b/arch/blackfin/mach-common/cpufreq.c index 01506504e6d0..3d18d2ba4786 100644 --- a/arch/blackfin/mach-common/cpufreq.c +++ b/arch/blackfin/mach-common/cpufreq.c @@ -138,7 +138,8 @@ static int __init __bfin_cpu_init(struct cpufreq_policy *policy) dpm_state_table[index].tscale); } - policy->cpuinfo.transition_latency = (bfin_read_PLL_LOCKCNT() / (sclk / 1000000)) * 1000; + policy->cpuinfo.transition_latency = 50000; /* 50us assumed */ + /*Now ,only support one cpu */ policy->cur = cclk; cpufreq_frequency_table_get_attr(bfin_freq_table, policy->cpu);