xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

cpufreq: move freq change notifications to cpufreq core

Browse Source 
Most of the drivers do following in their ->target_index() routines:

	struct cpufreq_freqs freqs;
	freqs.old = old freq...
	freqs.new = new freq...

	cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);

	/* Change rate here */

	cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);

This is replicated over all cpufreq drivers today and there doesn't exists a
good enough reason why this shouldn't be moved to cpufreq core instead.

There are few special cases though, like exynos5440, which doesn't do everything
on the call to ->target_index() routine and call some kind of bottom halves for
doing this work, work/tasklet/etc..

They may continue doing notification from their own code as flag:
CPUFREQ_ASYNC_NOTIFICATION is already set for them.

All drivers are also modified in this patch to avoid breaking 'git bisect', as
double notification would happen otherwise.

Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Russell King <linux@arm.linux.org.uk>
Acked-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Reviewed-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar
2013-08-14 19:38:24 +05:30
committed by Rafael J. Wysocki
parent 7dbf694db6
commit d4019f0a92
40 changed files with 200 additions and 626 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
drivers/cpufreq/e_powersaver.c
View File

@@ -107,15 +107,9 @@ static int eps_set_state(struct eps_cpu_data *centaur,
struct cpufreq_policy *policy,
u32 dest_state)
{
struct cpufreq_freqs freqs;
u32 lo, hi;
int err = 0;
int i;
freqs.old = eps_get(policy->cpu);
freqs.new = centaur->fsb * ((dest_state >> 8) & 0xff);
cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
/* Wait while CPU is busy */
rdmsr(MSR_IA32_PERF_STATUS, lo, hi);
i = 0;
@@ -124,8 +118,7 @@ static int eps_set_state(struct eps_cpu_data *centaur,
rdmsr(MSR_IA32_PERF_STATUS, lo, hi);
i++;
if (unlikely(i > 64)) {
err = -ENODEV;
goto postchange;
return -ENODEV;
}
}
/* Set new multiplier and voltage */
@@ -137,16 +130,10 @@ static int eps_set_state(struct eps_cpu_data *centaur,
rdmsr(MSR_IA32_PERF_STATUS, lo, hi);
i++;
if (unlikely(i > 64)) {
err = -ENODEV;
goto postchange;
return -ENODEV;
}
} while (lo & ((1 << 16) | (1 << 17)));
/* Return current frequency */
postchange:
rdmsr(MSR_IA32_PERF_STATUS, lo, hi);
freqs.new = centaur->fsb * ((lo >> 8) & 0xff);
#ifdef DEBUG
{
u8 current_multiplier, current_voltage;
@@ -161,11 +148,7 @@ postchange:
current_multiplier);
}
#endif
if (err)
freqs.new = freqs.old;
cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
return err;
return 0;
}
static int eps_target(struct cpufreq_policy *policy, unsigned int index)