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timer: Added usleep[_range] timer

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usleep[_range] are finer precision implementations of msleep
and are designed to be drop-in replacements for udelay where
a precise sleep / busy-wait is unnecessary. They also allow
an easy interface to specify slack when a precise (ish)
wakeup is unnecessary to help minimize wakeups

Signed-off-by: Patrick Pannuto <ppannuto@codeaurora.org>
Cc: akinobu.mita@gmail.com
Cc: sboyd@codeaurora.org
Acked-by: Arjan van de Ven <arjan@linux.intel.com>
LKML-Reference: <4C44CDD2.1070708@codeaurora.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Patrick Pannuto 2010-07-19 15:09:26 -07:00 • committed by Thomas Gleixner
parent 866e26115c
commit 22b8f15c2f
2 changed files with 28 additions and 0 deletions
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6
include/linux/delay.h
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@ -45,6 +45,12 @@ extern unsigned long lpj_fine;
void calibrate_delay(void);
void msleep(unsigned int msecs);
unsigned long msleep_interruptible(unsigned int msecs);
void usleep_range(unsigned long min, unsigned long max);
static inline void usleep(unsigned long usecs)
{
usleep_range(usecs, usecs);
}
static inline void ssleep(unsigned int seconds)
{