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>

diff --git a/drivers/cpufreq/pmac64-cpufreq.c b/drivers/cpufreq/pmac64-cpufreq.c
index 889c0d5535722f23b395225be8731ee77ca0ea67..db9764e8366814dc977a6839917e02ae22493529 100644 (file)
--- 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;