Patchwork [v2,RESEND,2/3] cpufreq: pmac64: provide cpufreq transition latency for older G5 models

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Submitter Aaro Koskinen
Date Sept. 30, 2013, 8:44 p.m.
Message ID <1380573873-14448-3-git-send-email-aaro.koskinen@iki.fi>
Download mbox | patch
Permalink /patch/279261/
State Not Applicable
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Comments

Aaro Koskinen - Sept. 30, 2013, 8:44 p.m.
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>
---
 drivers/cpufreq/pmac64-cpufreq.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Patch

diff --git a/drivers/cpufreq/pmac64-cpufreq.c b/drivers/cpufreq/pmac64-cpufreq.c
index 46ae223..0196d60 100644
--- a/drivers/cpufreq/pmac64-cpufreq.c
+++ b/drivers/cpufreq/pmac64-cpufreq.c
@@ -647,8 +647,10 @@  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;