From 790d849bf811a8ab5d4cd2cce0f6fda92f6aebf2 Mon Sep 17 00:00:00 2001 From: Jacob Tanenbaum Date: Thu, 19 Nov 2015 10:29:01 -0500 Subject: [PATCH] cpufreq: pcc-cpufreq: update default value of cpuinfo_transition_latency The cpufreq documentation specifies policy->cpuinfo.transition_latency the time it takes on this CPU to switch between two frequencies in nanoseconds (if appropriate, else specify CPUFREQ_ETERNAL) currently pcc-cpufreq does not expose the value and sets it to zero. I changed the pcc-cpufreq driver and it's documentation to conform to the default value specified in Documentation/cpu-freq/cpu-drivers.txt Signed-off-by: Jacob Tanenbaum Acked-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- Documentation/cpu-freq/pcc-cpufreq.txt | 4 ++-- drivers/cpufreq/pcc-cpufreq.c | 2 ++ 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/Documentation/cpu-freq/pcc-cpufreq.txt b/Documentation/cpu-freq/pcc-cpufreq.txt index 9e3c3b33514c..0a94224ad296 100644 --- a/Documentation/cpu-freq/pcc-cpufreq.txt +++ b/Documentation/cpu-freq/pcc-cpufreq.txt @@ -159,8 +159,8 @@ to be strictly associated with a P-state. 2.2 cpuinfo_transition_latency: ------------------------------- -The cpuinfo_transition_latency field is 0. The PCC specification does -not include a field to expose this value currently. +The cpuinfo_transition_latency field is CPUFREQ_ETERNAL. The PCC specification +does not include a field to expose this value currently. 2.3 cpuinfo_cur_freq: --------------------- diff --git a/drivers/cpufreq/pcc-cpufreq.c b/drivers/cpufreq/pcc-cpufreq.c index 2a0d58959acf..808a320e9d5d 100644 --- a/drivers/cpufreq/pcc-cpufreq.c +++ b/drivers/cpufreq/pcc-cpufreq.c @@ -555,6 +555,8 @@ static int pcc_cpufreq_cpu_init(struct cpufreq_policy *policy) policy->min = policy->cpuinfo.min_freq = ioread32(&pcch_hdr->minimum_frequency) * 1000; + policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; + pr_debug("init: policy->max is %d, policy->min is %d\n", policy->max, policy->min); out: -- 2.20.1