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Subject[PATCH 3/7] cpufreq: Only query drivers that implement cpufreq_driver.target()
Date
From: Dirk Brandewie <dirk.brandewie@gmail.com>

Scaling drivers that implement cpufreq_driver.setpolicy() have
internal governors and may/will change the current operating frequency
very frequently this will cause cpufreq_out_of_sync() to be called
every time. Only call cpufreq_driver.get() for drivers that implement
cpufreq_driver.target()

Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
---
drivers/cpufreq/cpufreq.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 96bc302..d8daa4b 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1787,7 +1787,7 @@ int cpufreq_update_policy(unsigned int cpu)

/* BIOS might change freq behind our back
-> ask driver for current freq and notify governors about a change */
- if (cpufreq_driver->get) {
+ if (cpufreq_driver->get && cpufreq_driver->target) {
policy.cur = cpufreq_driver->get(cpu);
if (!data->cur) {
pr_debug("Driver did not initialize current freq");
--
1.7.7.6


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