linux-kernel - [PATCH v2 4/6] iio: magnetometer: mmc35240: Use a smaller sleep value

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Message-Id: <1433502195-30296-5-git-send-email-daniel.baluta@intel.com>
Date:	Fri,  5 Jun 2015 14:03:13 +0300
From:	Daniel Baluta <daniel.baluta@...el.com>
To:	jic23@...nel.org, pmeerw@...erw.net
Cc:	daniel.baluta@...el.com, knaack.h@....de, lars@...afoo.de,
	linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org
Subject: [PATCH v2 4/6] 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@...el.com>
---
 drivers/iio/magnetometer/mmc35240.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/magnetometer/mmc35240.c b/drivers/iio/magnetometer/mmc35240.c
index 7fff38e..7bc72b3 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) {
-- 
1.9.1

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