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authorViresh Kumar <viresh.kumar@linaro.org>2013-08-14 18:08:24 +0400
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-10-31 03:11:08 +0400
commitd4019f0a92ab802f385cc9c8ad3ab7b5449712cb (patch)
treeebd06695585e457ae1bf219653452b111e7508db /drivers/cpufreq/omap-cpufreq.c
parent7dbf694db6ac7c759599316d50d7050efcbd512a (diff)
downloadlinux-d4019f0a92ab802f385cc9c8ad3ab7b5449712cb.tar.xz
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/omap-cpufreq.c')
-rw-r--r--drivers/cpufreq/omap-cpufreq.c38
1 files changed, 13 insertions, 25 deletions
diff --git a/drivers/cpufreq/omap-cpufreq.c b/drivers/cpufreq/omap-cpufreq.c
index b5512712298f..be6d14307aa8 100644
--- a/drivers/cpufreq/omap-cpufreq.c
+++ b/drivers/cpufreq/omap-cpufreq.c
@@ -53,15 +53,14 @@ static unsigned int omap_getspeed(unsigned int cpu)
static int omap_target(struct cpufreq_policy *policy, unsigned int index)
{
- int r, ret = 0;
- struct cpufreq_freqs freqs;
struct dev_pm_opp *opp;
unsigned long freq, volt = 0, volt_old = 0, tol = 0;
+ unsigned int old_freq, new_freq;
- freqs.old = omap_getspeed(policy->cpu);
- freqs.new = freq_table[index].frequency;
+ old_freq = omap_getspeed(policy->cpu);
+ new_freq = freq_table[index].frequency;
- freq = freqs.new * 1000;
+ freq = new_freq * 1000;
ret = clk_round_rate(mpu_clk, freq);
if (IS_ERR_VALUE(ret)) {
dev_warn(mpu_dev,
@@ -77,7 +76,7 @@ static int omap_target(struct cpufreq_policy *policy, unsigned int index)
if (IS_ERR(opp)) {
rcu_read_unlock();
dev_err(mpu_dev, "%s: unable to find MPU OPP for %d\n",
- __func__, freqs.new);
+ __func__, new_freq);
return -EINVAL;
}
volt = dev_pm_opp_get_voltage(opp);
@@ -87,43 +86,32 @@ static int omap_target(struct cpufreq_policy *policy, unsigned int index)
}
dev_dbg(mpu_dev, "cpufreq-omap: %u MHz, %ld mV --> %u MHz, %ld mV\n",
- freqs.old / 1000, volt_old ? volt_old / 1000 : -1,
- freqs.new / 1000, volt ? volt / 1000 : -1);
-
- /* notifiers */
- cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+ old_freq / 1000, volt_old ? volt_old / 1000 : -1,
+ new_freq / 1000, volt ? volt / 1000 : -1);
/* scaling up? scale voltage before frequency */
- if (mpu_reg && (freqs.new > freqs.old)) {
+ if (mpu_reg && (new_freq > old_freq)) {
r = regulator_set_voltage(mpu_reg, volt - tol, volt + tol);
if (r < 0) {
dev_warn(mpu_dev, "%s: unable to scale voltage up.\n",
__func__);
- freqs.new = freqs.old;
- goto done;
+ return r;
}
}
- ret = clk_set_rate(mpu_clk, freqs.new * 1000);
+ ret = clk_set_rate(mpu_clk, new_freq * 1000);
/* scaling down? scale voltage after frequency */
- if (mpu_reg && (freqs.new < freqs.old)) {
+ if (mpu_reg && (new_freq < old_freq)) {
r = regulator_set_voltage(mpu_reg, volt - tol, volt + tol);
if (r < 0) {
dev_warn(mpu_dev, "%s: unable to scale voltage down.\n",
__func__);
- ret = clk_set_rate(mpu_clk, freqs.old * 1000);
- freqs.new = freqs.old;
- goto done;
+ clk_set_rate(mpu_clk, old_freq * 1000);
+ return r;
}
}
- freqs.new = omap_getspeed(policy->cpu);
-
-done:
- /* notifiers */
- cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
-
return ret;
}