ASoC: fsl_sai: 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 <[email protected]>
Signed-off-by: Mark Brown <[email protected]>

diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
index 43ba5dc267754e449514310c36d2cb4c00092101..4919de9684eb8d10752ad2592534533e50e2e2e0 100644 (file)
--- a/sound/soc/fsl/fsl_sai.c
+++ b/sound/soc/fsl/fsl_sai.c
@@ -17,6 +17,7 @@
 #include <linux/of_address.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
 #include <linux/of_address.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>

+#include <linux/time.h>

 #include <sound/core.h>
 #include <sound/dmaengine_pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/core.h>
 #include <sound/dmaengine_pcm.h>
 #include <sound/pcm_params.h>


@@ -884,7 +885,7 @@ static int fsl_sai_resume(struct device *dev)
        regcache_cache_only(sai->regmap, false);
        regmap_write(sai->regmap, FSL_SAI_TCSR, FSL_SAI_CSR_SR);
        regmap_write(sai->regmap, FSL_SAI_RCSR, FSL_SAI_CSR_SR);
        regcache_cache_only(sai->regmap, false);
        regmap_write(sai->regmap, FSL_SAI_TCSR, FSL_SAI_CSR_SR);
        regmap_write(sai->regmap, FSL_SAI_RCSR, FSL_SAI_CSR_SR);

-       msleep(1);
+       usleep_range(1000, 2000);

        regmap_write(sai->regmap, FSL_SAI_TCSR, 0);
        regmap_write(sai->regmap, FSL_SAI_RCSR, 0);
        return regcache_sync(sai->regmap);
        regmap_write(sai->regmap, FSL_SAI_TCSR, 0);
        regmap_write(sai->regmap, FSL_SAI_RCSR, 0);
        return regcache_sync(sai->regmap);