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>

1 files changed, 6 insertions, 11 deletions

diff --git a/drivers/cpufreq/sa1100-cpufreq.c b/drivers/cpufreq/sa1100-cpufreq.c
index b0da1fe40b1d..623da742f8e7 100644
--- a/drivers/cpufreq/sa1100-cpufreq.c
+++ b/drivers/cpufreq/sa1100-cpufreq.c
@@ -180,22 +180,17 @@ static void sa1100_update_dram_timings(int current_speed, int new_speed)
 static int sa1100_target(struct cpufreq_policy *policy, unsigned int ppcr)
 {
         unsigned int cur = sa11x0_getspeed(0);
-        struct cpufreq_freqs freqs;
+        unsigned int new_freq;
 
-        freqs.old = cur;
-        freqs.new = sa11x0_freq_table[ppcr].frequency;
+        new_freq = sa11x0_freq_table[ppcr].frequency;
 
-        cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
-
-        if (freqs.new > cur)
-                sa1100_update_dram_timings(cur, freqs.new);
+        if (new_freq > cur)
+                sa1100_update_dram_timings(cur, new_freq);
 
         PPCR = ppcr;
 
-        if (freqs.new < cur)
-                sa1100_update_dram_timings(cur, freqs.new);
-
-        cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
+        if (new_freq < cur)
+                sa1100_update_dram_timings(cur, new_freq);
 
         return 0;
 }