diff options
| author | Rafael J. Wysocki | 2019-03-26 12:15:13 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki | 2019-04-01 23:43:05 +0200 |
| commit | 5a25e3f7cc538fb49e11267c1e41c54ccf83835e (patch) | |
| tree | e964c1948f3065cc885e0c36fe1b061c3d5ffd45 /drivers/cpufreq/cpufreq.c | |
| parent | 79a3aaa7b82e3106be97842dedfd8429248896e6 (diff) | |
cpufreq: intel_pstate: Driver-specific handling of _PPC updates
In some cases, the platform firmware disables or enables turbo
frequencies for all CPUs globally before triggering a _PPC change
notification for one of them. Obviously, that global change affects
all CPUs, not just the notified one, and it needs to be acted upon by
cpufreq.
The intel_pstate driver is able to detect such global changes of
the settings, but it also needs to update policy limits for all
CPUs if that happens, in particular if turbo frequencies are
enabled globally - to allow them to be used.
For this reason, introduce a new cpufreq driver callback to be
invoked on _PPC notifications, if present, instead of simply
calling cpufreq_update_policy() for the notified CPU and make
intel_pstate use it to trigger policy updates for all CPUs
in the system if global settings change.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=200759
Reported-by: Gabriele Mazzotta <gabriele.mzt@gmail.com>
Tested-by: Gabriele Mazzotta <gabriele.mzt@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'drivers/cpufreq/cpufreq.c')
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index e10922709d13..bb63347f6af1 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -2370,6 +2370,22 @@ unlock: } EXPORT_SYMBOL(cpufreq_update_policy); +/** + * cpufreq_update_limits - Update policy limits for a given CPU. + * @cpu: CPU to update the policy limits for. + * + * Invoke the driver's ->update_limits callback if present or call + * cpufreq_update_policy() for @cpu. + */ +void cpufreq_update_limits(unsigned int cpu) +{ + if (cpufreq_driver->update_limits) + cpufreq_driver->update_limits(cpu); + else + cpufreq_update_policy(cpu); +} +EXPORT_SYMBOL_GPL(cpufreq_update_limits); + /********************************************************************* * BOOST * *********************************************************************/ |