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Commit ae6b4271 authored Dec 03, 2013 by Viresh Kumar Committed by Rafael J. Wysocki Jan 06, 2014

cpufreq: Mark ARM drivers with CPUFREQ_NEED_INITIAL_FREQ_CHECK flag

Sometimes boot loaders set CPU frequency to a value outside of frequency table
present with cpufreq core. In such cases CPU might be unstable if it has to run
on that frequency for long duration of time and so its better to set it to a
frequency which is specified in frequency table.

On some systems we can't really say what frequency we're running at the moment
and so for these we shouldn't check if we are running at a frequency present in
frequency table. And so we really can't force this for all the cpufreq drivers.

Hence we are created another flag here: CPUFREQ_NEED_INITIAL_FREQ_CHECK that
will be marked by platforms which want to go for this check at boot time.

Initially this is done for all ARM platforms but others may follow if required.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent 20b7cbe2

drivers/cpufreq/arm_big_little.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -488,7 +488,8 @@ static int bL_cpufreq_exit(struct cpufreq_policy *policy)
		static struct cpufreq_driver bL_cpufreq_driver = {
		.name = "arm-big-little",
		.flags = CPUFREQ_STICKY \|
		CPUFREQ_HAVE_GOVERNOR_PER_POLICY,
		CPUFREQ_HAVE_GOVERNOR_PER_POLICY \|
		CPUFREQ_NEED_INITIAL_FREQ_CHECK,
		.verify = cpufreq_generic_frequency_table_verify,
		.target_index = bL_cpufreq_set_target,
		.get = bL_cpufreq_get_rate,

drivers/cpufreq/davinci-cpufreq.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -126,7 +126,7 @@ static int davinci_cpu_init(struct cpufreq_policy *policy)
		}

		static struct cpufreq_driver davinci_driver = {
		.flags = CPUFREQ_STICKY,
		.flags = CPUFREQ_STICKY \| CPUFREQ_NEED_INITIAL_FREQ_CHECK,
		.verify = davinci_verify_speed,
		.target_index = davinci_target,
		.get = davinci_getspeed,

drivers/cpufreq/dbx500-cpufreq.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -48,7 +48,8 @@ static int dbx500_cpufreq_init(struct cpufreq_policy *policy)
		}

		static struct cpufreq_driver dbx500_cpufreq_driver = {
		.flags = CPUFREQ_STICKY \| CPUFREQ_CONST_LOOPS,
		.flags = CPUFREQ_STICKY \| CPUFREQ_CONST_LOOPS \|
		CPUFREQ_NEED_INITIAL_FREQ_CHECK,
		.verify = cpufreq_generic_frequency_table_verify,
		.target_index = dbx500_cpufreq_target,
		.get = dbx500_cpufreq_getspeed,

drivers/cpufreq/exynos-cpufreq.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -218,7 +218,7 @@ static int exynos_cpufreq_cpu_init(struct cpufreq_policy *policy)
		}

		static struct cpufreq_driver exynos_driver = {
		.flags = CPUFREQ_STICKY,
		.flags = CPUFREQ_STICKY \| CPUFREQ_NEED_INITIAL_FREQ_CHECK,
		.verify = cpufreq_generic_frequency_table_verify,
		.target_index = exynos_target,
		.get = exynos_getspeed,

drivers/cpufreq/exynos5440-cpufreq.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -312,7 +312,8 @@ static int exynos_cpufreq_cpu_init(struct cpufreq_policy *policy)
		}

		static struct cpufreq_driver exynos_driver = {
		.flags = CPUFREQ_STICKY \| CPUFREQ_ASYNC_NOTIFICATION,
		.flags = CPUFREQ_STICKY \| CPUFREQ_ASYNC_NOTIFICATION \|
		CPUFREQ_NEED_INITIAL_FREQ_CHECK,
		.verify = cpufreq_generic_frequency_table_verify,
		.target_index = exynos_target,
		.get = exynos_getspeed,