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>

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;