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authorLinus Walleij <linus.walleij@linaro.org>2012-01-10 15:10:41 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-10 16:30:52 -0800
commit012e52e15e7ebbc7b08165e8f4b10f71a3e6810b (patch)
tree83b34597c52f4bb13f9a7341321e5cc7cedf5680 /drivers
parentb62581e6241c33b9fef45117f86830058738371f (diff)
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')
-rw-r--r--drivers/rtc/rtc-ab8500.c6
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);