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 4.11-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-4.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6272c0de13abf1480f701d38288f28a11b4301c4 Mon Sep 17 00:00:00 2001
From: Matt Ranostay <matt.ranostay@xxxxxxxxxxxx>
Date: Fri, 14 Apr 2017 16:38:19 -0700
Subject: iio: proximity: as3935: recalibrate RCO after resume
From: Matt Ranostay <matt.ranostay@xxxxxxxxxxxx>
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@xxxxxxxxx>
Signed-off-by: Matt Ranostay <matt.ranostay@xxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -269,8 +269,6 @@ 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));
@@ -280,8 +278,6 @@ 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
@@ -318,6 +314,8 @@ 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 matt.ranostay@xxxxxxxxxxxx are
queue-4.11/iio-proximity-as3935-recalibrate-rco-after-resume.patch