This is a note to let you know that I've just added the patch titled
iio: ad7793: Fix the serial interface reset
to the 4.13-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-ad7793-fix-the-serial-interface-reset.patch
and it can be found in the queue-4.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7ee3b7ebcb74714df6d94c8f500f307e1ee5dda5 Mon Sep 17 00:00:00 2001
From: Dragos Bogdan <dragos.bogdan@xxxxxxxxxx>
Date: Tue, 5 Sep 2017 15:16:13 +0300
Subject: iio: ad7793: Fix the serial interface reset
From: Dragos Bogdan <dragos.bogdan@xxxxxxxxxx>
commit 7ee3b7ebcb74714df6d94c8f500f307e1ee5dda5 upstream.
The serial interface can be reset by writing 32 consecutive 1s to the device.
'ret' was initialized correctly but its value was overwritten when
ad7793_check_platform_data() was called. Since a dedicated reset function
is present now, it should be used instead.
Fixes: 2edb769d246e ("iio:ad7793: Add support for the ad7798 and ad7799")
Signed-off-by: Dragos Bogdan <dragos.bogdan@xxxxxxxxxx>
Acked-by: Lars-Peter Clausen <lars@xxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iio/adc/ad7793.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/iio/adc/ad7793.c
+++ b/drivers/iio/adc/ad7793.c
@@ -257,7 +257,7 @@ static int ad7793_setup(struct iio_dev *
unsigned int vref_mv)
{
struct ad7793_state *st = iio_priv(indio_dev);
- int i, ret = -1;
+ int i, ret;
unsigned long long scale_uv;
u32 id;
@@ -266,7 +266,7 @@ static int ad7793_setup(struct iio_dev *
return ret;
/* reset the serial interface */
- ret = spi_write(st->sd.spi, (u8 *)&ret, sizeof(ret));
+ ret = ad_sd_reset(&st->sd, 32);
if (ret < 0)
goto out;
usleep_range(500, 2000); /* Wait for at least 500us */
Patches currently in stable-queue which might be from dragos.bogdan@xxxxxxxxxx are
queue-4.13/iio-ad7793-fix-the-serial-interface-reset.patch
queue-4.13/iio-ad_sigma_delta-implement-a-dedicated-reset-function.patch