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authorViresh Kumar <viresh.kumar@linaro.org>2013-08-14 19:38:24 +0530
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-10-31 00:11:08 +0100
commitd4019f0a92ab802f385cc9c8ad3ab7b5449712cb (patch)
treeebd06695585e457ae1bf219653452b111e7508db /drivers/cpufreq/speedstep-centrino.c
parent7dbf694db6ac7c759599316d50d7050efcbd512a (diff)
downloadleg-kernel-d4019f0a92ab802f385cc9c8ad3ab7b5449712cb.tar.gz
cpufreq: move freq change notifications to cpufreq core
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>
Diffstat (limited to 'drivers/cpufreq/speedstep-centrino.c')
-rw-r--r--drivers/cpufreq/speedstep-centrino.c21
1 files changed, 1 insertions, 20 deletions
diff --git a/drivers/cpufreq/speedstep-centrino.c b/drivers/cpufreq/speedstep-centrino.c
index c51ec8c0e3a8..4e1daca5ce3b 100644
--- a/drivers/cpufreq/speedstep-centrino.c
+++ b/drivers/cpufreq/speedstep-centrino.c
@@ -423,9 +423,8 @@ static int centrino_cpu_exit(struct cpufreq_policy *policy)
static int centrino_target(struct cpufreq_policy *policy, unsigned int index)
{
unsigned int msr, oldmsr = 0, h = 0, cpu = policy->cpu;
- struct cpufreq_freqs freqs;
int retval = 0;
- unsigned int j, first_cpu, tmp;
+ unsigned int j, first_cpu;
struct cpufreq_frequency_table *op_points;
cpumask_var_t covered_cpus;
@@ -473,16 +472,6 @@ static int centrino_target(struct cpufreq_policy *policy, unsigned int index)
goto out;
}
- freqs.old = extract_clock(oldmsr, cpu, 0);
- freqs.new = extract_clock(msr, cpu, 0);
-
- pr_debug("target=%dkHz old=%d new=%d msr=%04x\n",
- op_points->frequency, freqs.old, freqs.new,
- msr);
-
- cpufreq_notify_transition(policy, &freqs,
- CPUFREQ_PRECHANGE);
-
first_cpu = 0;
/* all but 16 LSB are reserved, treat them with care */
oldmsr &= ~0xffff;
@@ -497,8 +486,6 @@ static int centrino_target(struct cpufreq_policy *policy, unsigned int index)
cpumask_set_cpu(j, covered_cpus);
}
- cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
-
if (unlikely(retval)) {
/*
* We have failed halfway through the frequency change.
@@ -509,12 +496,6 @@ static int centrino_target(struct cpufreq_policy *policy, unsigned int index)
for_each_cpu(j, covered_cpus)
wrmsr_on_cpu(j, MSR_IA32_PERF_CTL, oldmsr, h);
-
- tmp = freqs.new;
- freqs.new = freqs.old;
- freqs.old = tmp;
- cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
- cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
}
retval = 0;