Messages in this thread Patch in this message | | | From | dirk.brandewie@gmail ... | Subject | [PATCH 2/6] cpufreq: Only query drivers that implement cpufreq_driver.target() | Date | Fri, 1 Feb 2013 10:45:36 -0800 |
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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 1c037f0..493cd50 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1794,7 +1794,7 @@ 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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