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Commit 012e52e1 authored by Linus Walleij's avatar Linus Walleij Committed by Linus Torvalds
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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: default avatarLinus 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b62581e6

drivers/rtc/rtc-ab8500.c

+3 −3
Original line number Diff line number Diff line
@@ -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);