linux-kernel - [PATCH 4.4 13/30] iio: proximity: as3935: recalibrate RCO after resume

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Message-Id: <20170619152033.939369581@linuxfoundation.org>
Date:   Mon, 19 Jun 2017 23:20:47 +0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        George McCollister <george.mccollister@...il.com>,
        Matt Ranostay <matt.ranostay@...sulko.com>,
        Jonathan Cameron <jic23@...nel.org>
Subject: [PATCH 4.4 13/30] iio: proximity: as3935: recalibrate RCO after resume

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Matt Ranostay <matt.ranostay@...sulko.com>

commit 6272c0de13abf1480f701d38288f28a11b4301c4 upstream.

According to the datasheet the RCO must be recalibrated
on every power-on-reset. Also remove mutex locking in the
calibration function since callers other than the probe
function (which doesn't need it) will have a lock.

Fixes: 24ddb0e4bba4 ("iio: Add AS3935 lightning sensor support")
Cc: George McCollister <george.mccollister@...il.com>
Signed-off-by: Matt Ranostay <matt.ranostay@...sulko.com>
Signed-off-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/iio/proximity/as3935.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--- a/drivers/iio/proximity/as3935.c
+++ b/drivers/iio/proximity/as3935.c
@@ -263,8 +263,6 @@ static irqreturn_t as3935_interrupt_hand
 
 static void calibrate_as3935(struct as3935_state *st)
 {
-	mutex_lock(&st->lock);
-
 	/* mask disturber interrupt bit */
 	as3935_write(st, AS3935_INT, BIT(5));
 
@@ -274,8 +272,6 @@ static void calibrate_as3935(struct as39
 
 	mdelay(2);
 	as3935_write(st, AS3935_TUNE_CAP, (st->tune_cap / TUNE_CAP_DIV));
-
-	mutex_unlock(&st->lock);
 }
 
 #ifdef CONFIG_PM_SLEEP
@@ -312,6 +308,8 @@ static int as3935_resume(struct device *
 	val &= ~AS3935_AFE_PWR_BIT;
 	ret = as3935_write(st, AS3935_AFE_GAIN, val);
 
+	calibrate_as3935(st);
+
 err_resume:
 	mutex_unlock(&st->lock);