Patch "iio: proximity: as3935: recalibrate RCO after resume" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

iio: proximity: as3935: recalibrate RCO after resume

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
iio-proximity-as3935-recalibrate-rco-after-resume.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Matt Ranostay <[email protected]>
Date: Fri, 14 Apr 2017 16:38:19 -0700
Subject: iio: proximity: as3935: recalibrate RCO after resume

From: Matt Ranostay <[email protected]>

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.

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

@@ -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);
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/iio-proximity-as3935-recalibrate-rco-after-resume.patch