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Commit 79fd1141 authored by Guodong Xu's avatar Guodong Xu Committed by Mark Brown
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regulator: core: factor out delay function from _regulator_do_enable 



A common delay function can be helpful when implementing new features. Factor
it out to maximize code reusability.

Signed-off-by: default avatarGuodong Xu <guodong.xu@linaro.org>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent 272e2315

drivers/regulator/core.c

+40 −34
Original line number Diff line number Diff line
@@ -1759,6 +1759,45 @@ static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) 
	return 0;

}



/**

 * _regulator_enable_delay - a delay helper function

 * @delay: time to delay in microseconds

 *

 * Delay for the requested amount of time as per the guidelines in:

 *

 *     Documentation/timers/timers-howto.txt

 *

 * The assumption here is that regulators will never be enabled in

 * atomic context and therefore sleeping functions can be used.

 */

static void _regulator_enable_delay(unsigned int delay)

{

	unsigned int ms = delay / 1000;

	unsigned int us = delay % 1000;



	if (ms > 0) {

		/*

		 * For small enough values, handle super-millisecond

		 * delays in the usleep_range() call below.

		 */

		if (ms < 20)

			us += ms * 1000;

		else

			msleep(ms);

	}



	/*

	 * Give the scheduler some room to coalesce with any other

	 * wakeup sources. For delays shorter than 10 us, don't even

	 * bother setting up high-resolution timers and just busy-

	 * loop.

	 */

	if (us >= 10)

		usleep_range(us, us + 100);

	else

		udelay(us);

}



static int _regulator_do_enable(struct regulator_dev *rdev)

{

	int ret, delay;
@@ -1792,40 +1831,7 @@ static int _regulator_do_enable(struct regulator_dev *rdev) 
	 * together.  */

	trace_regulator_enable_delay(rdev_get_name(rdev));



	/*

	 * Delay for the requested amount of time as per the guidelines in:

	 *

	 *     Documentation/timers/timers-howto.txt

	 *

	 * The assumption here is that regulators will never be enabled in

	 * atomic context and therefore sleeping functions can be used.

	 */

	if (delay) {

		unsigned int ms = delay / 1000;

		unsigned int us = delay % 1000;



		if (ms > 0) {

			/*

			 * For small enough values, handle super-millisecond

			 * delays in the usleep_range() call below.

			 */

			if (ms < 20)

				us += ms * 1000;

			else

				msleep(ms);

		}



		/*

		 * Give the scheduler some room to coalesce with any other

		 * wakeup sources. For delays shorter than 10 us, don't even

		 * bother setting up high-resolution timers and just busy-

		 * loop.

		 */

		if (us >= 10)

			usleep_range(us, us + 100);

		else

			udelay(us);

	}

	_regulator_enable_delay(delay);



	trace_regulator_enable_complete(rdev_get_name(rdev));