Commit 0d55ad45 authored Jan 15, 2016 by Xiubo Li Committed by Mark Brown Jan 22, 2016

ASoC: fsl-mpc5200: Use usleep_range() instead of msleep()



Since msleep() will sleep longer than intended time for values less
than 20ms, this patch allows the use of usleep_range for just 1ms.
usleep_range is a finer precision implementation of msleep and is
designed to be a drop-in replacement for udelay where a precise
sleep/busy-wait is unnecessary.

More details see Documentation/timers/timers-howto.txt.

Signed-off-by: Xiubo Li <lixiubo@cmss.chinamobile.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

parent 822ad70a

sound/soc/fsl/mpc5200_psc_ac97.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -13,6 +13,7 @@
		#include <linux/of_device.h>
		#include <linux/of_platform.h>
		#include <linux/delay.h>
		#include <linux/time.h>

		#include <sound/pcm.h>
		#include <sound/pcm_params.h>
		@@ -127,7 +128,7 @@ static void psc_ac97_cold_reset(struct snd_ac97 *ac97)

		mutex_unlock(&psc_dma->mutex);

		msleep(1);
		usleep_range(1000, 2000);
		psc_ac97_warm_reset(ac97);
		}