[PATCH] Add suspend method to cpufreq core

In order to properly fix some issues with cpufreq vs. sleep on
PowerBooks, I had to add a suspend callback to the pmac_cpufreq driver.
I must force a switch to full speed before sleep and I switch back to
previous speed on resume.

I also added a driver flag to disable the warnings in suspend/resume
since it is expected in this case to have different speed (and I want it
to fixup the jiffies properly).

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 910eca35583d..f21af067d015 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -103,6 +103,7 @@ struct cpufreq_policy {
 #define CPUFREQ_PRECHANGE       (0)
 #define CPUFREQ_POSTCHANGE      (1)
 #define CPUFREQ_RESUMECHANGE    (8)
+#define CPUFREQ_SUSPENDCHANGE   (9)
 
 struct cpufreq_freqs {
         unsigned int cpu;       /* cpu nr */
@@ -200,6 +201,7 @@ struct cpufreq_driver {
 
         /* optional */
         int     (*exit)         (struct cpufreq_policy *policy);
+        int     (*suspend)      (struct cpufreq_policy *policy, u32 state);
         int     (*resume)       (struct cpufreq_policy *policy);
         struct freq_attr        **attr;
 };
@@ -211,7 +213,8 @@ struct cpufreq_driver {
 #define CPUFREQ_CONST_LOOPS     0x02    /* loops_per_jiffy or other kernel
                                          * "constants" aren't affected by
                                          * frequency transitions */
-
+#define CPUFREQ_PM_NO_WARN      0x04    /* don't warn on suspend/resume speed
+                                         * mismatches */
 
 int cpufreq_register_driver(struct cpufreq_driver *driver_data);
 int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);