diff options
| author |   Aaro Koskinen <aaro.koskinen@iki.fi> | 2013-09-30 23:44:32 +0300 |
|---|---|---|
| committer |   Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-10-17 00:56:56 +0200 |
| commit | af671d8b2c2ace771e08566b20774cc08ee53316 (patch) | |
| tree | 7f083611bb9ea2c653d97a1cfc9db8be0ba65e1d /drivers/cpufreq/pmac64-cpufreq.c | |
| parent | cpufreq: pmac64: speed up frequency switch (diff) | |
| download | linux-dev-af671d8b2c2ace771e08566b20774cc08ee53316.tar.xz linux-dev-af671d8b2c2ace771e08566b20774cc08ee53316.zip | |
cpufreq: pmac64: provide cpufreq transition latency for older G5 models
Currently cpufreq ondemand governor cannot used on older G5 models,
because the transition latency is set to CPUFREQ_ETERNAL. Provide a
value based on a measurement on Xserve G5, which happens to be also the
highest allowed latency.
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq/pmac64-cpufreq.c')
| -rw-r--r-- | drivers/cpufreq/pmac64-cpufreq.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/cpufreq/pmac64-cpufreq.c b/drivers/cpufreq/pmac64-cpufreq.c index 889c0d553572..db9764e83668 100644 --- a/drivers/cpufreq/pmac64-cpufreq.c +++ b/drivers/cpufreq/pmac64-cpufreq.c @@ -627,8 +627,10 @@ static int __init g5_pm72_cpufreq_init(struct device_node *cpunode) g5_cpu_freqs[0].frequency = max_freq; g5_cpu_freqs[1].frequency = min_freq; + /* Based on a measurement on Xserve G5, rounded up. */ + transition_latency = 10 * NSEC_PER_MSEC; + /* Set callbacks */ - transition_latency = CPUFREQ_ETERNAL; g5_switch_volt = g5_pfunc_switch_volt; g5_switch_freq = g5_pfunc_switch_freq; g5_query_freq = g5_pfunc_query_freq; |