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[PATCH] ARM: Add VST idle loop call 

This call allows the dynamic tick support to reprogram the timer
immediately before the CPU idles.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
hifive-unleashed-5.1
Russell King 2005-06-27 14:04:05 +01:00 committed by Russell King
parent 99bcc05908
commit 2ea83398b7
3 changed files with 13 additions and 4 deletions
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5
arch/arm/kernel/process.c
View File

@ -32,6 +32,7 @@
#include <asm/leds.h>
#include <asm/processor.h>
#include <asm/uaccess.h>
#include <asm/mach/time.h>
extern const char *processor_modes[];
extern void setup_mm_for_reboot(char mode);
@ -85,8 +86,10 @@ EXPORT_SYMBOL(pm_power_off);
void default_idle(void)
{
local_irq_disable();
if (!need_resched() && !hlt_counter)
if (!need_resched() && !hlt_counter) {
timer_dyn_reprogram();
arch_idle();
}
local_irq_enable();
}

10
arch/arm/kernel/time.c
View File

@ -424,15 +424,19 @@ static int timer_dyn_tick_disable(void)
return ret;
}
/*
* Reprogram the system timer for at least the calculated time interval.
* This function should be called from the idle thread with IRQs disabled,
* immediately before sleeping.
*/
void timer_dyn_reprogram(void)
{
struct dyn_tick_timer *dyn_tick = system_timer->dyn_tick;
unsigned long flags;
write_seqlock_irqsave(&xtime_lock, flags);
write_seqlock(&xtime_lock);
if (dyn_tick->state & DYN_TICK_ENABLED)
dyn_tick->reprogram(next_timer_interrupt() - jiffies);
write_sequnlock_irqrestore(&xtime_lock, flags);
write_sequnlock(&xtime_lock);
}
static ssize_t timer_show_dyn_tick(struct sys_device *dev, char *buf)

2
include/asm-arm/mach/time.h
View File

@ -60,6 +60,8 @@ struct dyn_tick_timer {
};
void timer_dyn_reprogram(void);
#else
#define timer_dyn_reprogram() do { } while (0)
#endif
extern struct sys_timer *system_timer;