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| author | Linus Walleij <linus.walleij@linaro.org> | 2012-01-10 15:10:41 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-01-10 16:30:52 -0800 |
| commit | 012e52e15e7ebbc7b08165e8f4b10f71a3e6810b (patch) | |
| tree | 83b34597c52f4bb13f9a7341321e5cc7cedf5680 /drivers/rtc | |
| parent | b62581e6241c33b9fef45117f86830058738371f (diff) | |
| download | lwn-012e52e15e7ebbc7b08165e8f4b10f71a3e6810b.tar.gz lwn-012e52e15e7ebbc7b08165e8f4b10f71a3e6810b.zip | |
drivers/rtc/rtc-ab8500.c: change msleep() to usleep_range()
The resolution of msleep is related to HZ, so with HZ set to 100 any
msleep of less than 10ms will become ~10ms. This is not what we want.
Use the hrtimer-based usleep_range() and allow for some slack in the
non-critical path so we have more control of what is happening here.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Jonas Aaberg <jonas.aberg@stericsson.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/rtc-ab8500.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/rtc/rtc-ab8500.c b/drivers/rtc/rtc-ab8500.c index 82a348095a71..919b2e5cb7f0 100644 --- a/drivers/rtc/rtc-ab8500.c +++ b/drivers/rtc/rtc-ab8500.c @@ -90,7 +90,7 @@ static int ab8500_rtc_read_time(struct device *dev, struct rtc_time *tm) /* Early AB8500 chips will not clear the rtc read request bit */ if (abx500_get_chip_id(dev) == 0) { - msleep(1); + usleep_range(1000, 1000); } else { /* Wait for some cycles after enabling the rtc read in ab8500 */ while (time_before(jiffies, timeout)) { @@ -102,7 +102,7 @@ static int ab8500_rtc_read_time(struct device *dev, struct rtc_time *tm) if (!(value & RTC_READ_REQUEST)) break; - msleep(1); + usleep_range(1000, 5000); } } @@ -295,7 +295,7 @@ static int __devinit ab8500_rtc_probe(struct platform_device *pdev) return err; /* Wait for reset by the PorRtc */ - msleep(1); + usleep_range(1000, 5000); err = abx500_get_register_interruptible(&pdev->dev, AB8500_RTC, AB8500_RTC_STAT_REG, &rtc_ctrl); |