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>
diff --git a/drivers/cpufreq/blackfin-cpufreq.c b/drivers/cpufreq/blackfin-cpufreq.c
index 12528b2..e9e63fc 100644
--- a/drivers/cpufreq/blackfin-cpufreq.c
+++ b/drivers/cpufreq/blackfin-cpufreq.c
@@ -132,27 +132,23 @@
#ifndef CONFIG_BF60x
unsigned int plldiv;
#endif
- struct cpufreq_freqs freqs;
static unsigned long lpj_ref;
static unsigned int lpj_ref_freq;
+ unsigned int old_freq, new_freq;
int ret = 0;
#if defined(CONFIG_CYCLES_CLOCKSOURCE)
cycles_t cycles;
#endif
- freqs.old = bfin_getfreq_khz(0);
- freqs.new = bfin_freq_table[index].frequency;
+ old_freq = bfin_getfreq_khz(0);
+ new_freq = bfin_freq_table[index].frequency;
- pr_debug("cpufreq: changing cclk to %lu; target = %u, oldfreq = %u\n",
- freqs.new, freqs.new, freqs.old);
-
- cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
#ifndef CONFIG_BF60x
plldiv = (bfin_read_PLL_DIV() & SSEL) | dpm_state_table[index].csel;
bfin_write_PLL_DIV(plldiv);
#else
- ret = cpu_set_cclk(policy->cpu, freqs.new * 1000);
+ ret = cpu_set_cclk(policy->cpu, new_freq * 1000);
if (ret != 0) {
WARN_ONCE(ret, "cpufreq set freq failed %d\n", ret);
return ret;
@@ -168,17 +164,13 @@
#endif
if (!lpj_ref_freq) {
lpj_ref = loops_per_jiffy;
- lpj_ref_freq = freqs.old;
+ lpj_ref_freq = old_freq;
}
- if (freqs.new != freqs.old) {
+ if (new_freq != old_freq) {
loops_per_jiffy = cpufreq_scale(lpj_ref,
- lpj_ref_freq, freqs.new);
+ lpj_ref_freq, new_freq);
}
- /* TODO: just test case for cycles clock source, remove later */
- cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
-
- pr_debug("cpufreq: done\n");
return ret;
}