From: Daniel Baluta <daniel.baluta@intel.com>
Date: Fri, 5 Jun 2015 11:03:13 +0000 (+0300)
Subject: iio: magnetometer: mmc35240: Use a smaller sleep value
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=787f55c4d1842e5fb037a81bca9bd9d9fdfd46fe;p=deliverable%2Flinux.git

iio: magnetometer: mmc35240: Use a smaller sleep value

According to datasheet, Page 8, minimum wait time to complete
measurement is 10ms. Adjusting this value will increase the
userspace polling rate.

Fixes: abeb6b1e7b ("iio: magnetometer: Add support for MEMSIC MMC35240")
Signed-off-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
---

diff --git a/drivers/iio/magnetometer/mmc35240.c b/drivers/iio/magnetometer/mmc35240.c
index 146ae6613537..7fdf906b94c9 100644
--- a/drivers/iio/magnetometer/mmc35240.c
+++ b/drivers/iio/magnetometer/mmc35240.c
@@ -219,7 +219,8 @@ static int mmc35240_take_measurement(struct mmc35240_data *data)
 			return ret;
 		if (reg_status & MMC35240_STATUS_MEAS_DONE_BIT)
 			break;
-		msleep(20);
+		/* minimum wait time to complete measurement is 10 ms */
+		usleep_range(10000, 11000);
 	}
 
 	if (tries < 0) {