[Skiboot] [RFC PATCH 3/4] cpu: idle move the minimum PM latency into the idle code

[Nicholas Piggin]

The caller isn't in a position to know about PM heuristics, so
move the minimum timeout before power managmeent into the cpu idle
call. There is no functional change.

Signed-off-by: Nicholas Piggin <npiggin at gmail.com>
---
 core/cpu.c      | 3 ++-
 core/timebase.c | 4 +---
 include/cpu.h   | 2 +-
 3 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/core/cpu.c b/core/cpu.c
index 0bdf8299..2a95dff6 100644
--- a/core/cpu.c
+++ b/core/cpu.c
@@ -402,10 +402,11 @@ void cpu_idle_job(void)
 	}
 }
 
-void cpu_idle_delay(unsigned long delay, unsigned long min_pm)
+void cpu_idle_delay(unsigned long delay)
 {
 	unsigned long now = mftb();
 	unsigned long end = now + delay;
+	unsigned long min_pm = usecs_to_tb(10);
 
 	if (pm_enabled && delay > min_pm) {
 		for (;;) {
diff --git a/core/timebase.c b/core/timebase.c
index ca961c39..f2dff44b 100644
--- a/core/timebase.c
+++ b/core/timebase.c
@@ -66,14 +66,12 @@ void time_wait(unsigned long duration)
 
 void time_wait_nopoll(unsigned long duration)
 {
-	unsigned long min_sleep = usecs_to_tb(10);
-
 	if (this_cpu()->tb_invalid) {
 		cpu_relax();
 		return;
 	}
 
-	cpu_idle_delay(duration, min_sleep);
+	cpu_idle_delay(duration);
 }
 
 void time_wait_ms(unsigned long ms)
diff --git a/include/cpu.h b/include/cpu.h
index fd3acf77..f08940f7 100644
--- a/include/cpu.h
+++ b/include/cpu.h
@@ -268,7 +268,7 @@ extern unsigned long __attrconst cpu_stack_bottom(unsigned int pir);
 extern unsigned long __attrconst cpu_stack_top(unsigned int pir);
 
 extern void cpu_idle_job(void);
-extern void cpu_idle_delay(unsigned long delay, unsigned long min_pm);
+extern void cpu_idle_delay(unsigned long delay);
 
 extern void cpu_set_radix_mode(void);
 extern void cpu_fast_reboot_complete(void);
-- 
2.13.3