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| author | Javier Martinez Canillas <javier@osg.samsung.com> | 2016-01-27 00:36:39 -0300 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@free-electrons.com> | 2016-02-04 23:42:07 +0100 |
| commit | 5981804b83650de558c40769fb06f76fab31724e (patch) | |
| tree | a656cc75d52068d3f5075a503664a0d8881d5ebf /drivers/rtc | |
| parent | 862f9453bd1494f10b059076a3c97c3b90d248aa (diff) | |
| download | linux-stable-5981804b83650de558c40769fb06f76fab31724e.tar.gz linux-stable-5981804b83650de558c40769fb06f76fab31724e.tar.bz2 linux-stable-5981804b83650de558c40769fb06f76fab31724e.zip | |
rtc: max77686: Use usleep_range() instead of msleep()
Documentation/timers/timers-howto.txt suggest to use usleep_range()
instead of msleep() for small msec (1ms - 20ms) since msleep() will
often sleep for 20ms for any value in that range.
This is fine in this case since 16ms is the _minimum_ delay required
by max77686 for an RTC update but by using usleep_range() instead of
msleep(), the driver can support other RTC IP blocks with a shorter
minimum delay (i.e: in the range of usecs instead of msecs).
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Tested-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Andi Shyti <andi.shyti@samsung.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/rtc-max77686.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/rtc/rtc-max77686.c b/drivers/rtc/rtc-max77686.c index d84a50c9f7f7..025a17a95da3 100644 --- a/drivers/rtc/rtc-max77686.c +++ b/drivers/rtc/rtc-max77686.c @@ -41,7 +41,7 @@ #define ALARM_ENABLE_SHIFT 7 #define ALARM_ENABLE_MASK (1 << ALARM_ENABLE_SHIFT) -#define MAX77686_RTC_UPDATE_DELAY 16 +#define MAX77686_RTC_UPDATE_DELAY 16000 enum { RTC_SEC = 0, @@ -130,7 +130,8 @@ static int max77686_rtc_update(struct max77686_rtc_info *info, __func__, ret, data); else { /* Minimum 16ms delay required before RTC update. */ - msleep(MAX77686_RTC_UPDATE_DELAY); + usleep_range(MAX77686_RTC_UPDATE_DELAY, + MAX77686_RTC_UPDATE_DELAY * 2); } return ret; |