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| author | Michael Hennerich <michael.hennerich@analog.com> | 2009-09-25 09:03:21 (GMT) |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2009-12-15 05:14:00 (GMT) |
| commit | d887a1ce285f03c689bb4fbbaf574160bb484c3e (patch) | |
| tree | cb1bfea50d25294c7a4c1c886f1b0b5aab743016 /arch | |
| parent | 21b03cfe4c50fd586bfebd06d852457c07f60c2b (diff) | |
| download | linux-d887a1ce285f03c689bb4fbbaf574160bb484c3e.tar.xz | |
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 <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/blackfin/mach-common/cpufreq.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/blackfin/mach-common/cpufreq.c b/arch/blackfin/mach-common/cpufreq.c index 0150650..3d18d2b 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); |