* [PATCH 2/2] iio: ad7793: Fix the serial interface reset
@ 2017-09-05 12:16 Dragos Bogdan
2017-09-05 12:17 ` Lars-Peter Clausen
0 siblings, 1 reply; 3+ messages in thread
From: Dragos Bogdan @ 2017-09-05 12:16 UTC (permalink / raw)
To: Lars-Peter Clausen, Michael Hennerich, Jonathan Cameron
Cc: Hartmut Knaack, Peter Meerwald-Stadler, linux-iio, linux-kernel,
Dragos Bogdan
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@analog.com>
---
drivers/iio/adc/ad7793.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/adc/ad7793.c b/drivers/iio/adc/ad7793.c
index e6706a09e100..47c3d7f32900 100644
--- a/drivers/iio/adc/ad7793.c
+++ b/drivers/iio/adc/ad7793.c
@@ -257,7 +257,7 @@ static int ad7793_setup(struct iio_dev *indio_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 *indio_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 */
--
2.11.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH 2/2] iio: ad7793: Fix the serial interface reset
2017-09-05 12:16 [PATCH 2/2] iio: ad7793: Fix the serial interface reset Dragos Bogdan
@ 2017-09-05 12:17 ` Lars-Peter Clausen
2017-09-10 15:25 ` Jonathan Cameron
0 siblings, 1 reply; 3+ messages in thread
From: Lars-Peter Clausen @ 2017-09-05 12:17 UTC (permalink / raw)
To: Dragos Bogdan, Michael Hennerich, Jonathan Cameron
Cc: Hartmut Knaack, Peter Meerwald-Stadler, linux-iio, linux-kernel
On 09/05/2017 02:16 PM, Dragos Bogdan wrote:
> 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@analog.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
> ---
> drivers/iio/adc/ad7793.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iio/adc/ad7793.c b/drivers/iio/adc/ad7793.c
> index e6706a09e100..47c3d7f32900 100644
> --- a/drivers/iio/adc/ad7793.c
> +++ b/drivers/iio/adc/ad7793.c
> @@ -257,7 +257,7 @@ static int ad7793_setup(struct iio_dev *indio_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 *indio_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 */
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH 2/2] iio: ad7793: Fix the serial interface reset
2017-09-05 12:17 ` Lars-Peter Clausen
@ 2017-09-10 15:25 ` Jonathan Cameron
0 siblings, 0 replies; 3+ messages in thread
From: Jonathan Cameron @ 2017-09-10 15:25 UTC (permalink / raw)
To: Lars-Peter Clausen
Cc: Dragos Bogdan, Michael Hennerich, Hartmut Knaack,
Peter Meerwald-Stadler, linux-iio, linux-kernel
On Tue, 5 Sep 2017 14:17:21 +0200
Lars-Peter Clausen <lars@metafoo.de> wrote:
> On 09/05/2017 02:16 PM, Dragos Bogdan wrote:
> > 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@analog.com>
>
> Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Applied to the fixes-togreg branch of iio.git and marked
for stable.
Thanks
Jonathan
>
> > ---
> > drivers/iio/adc/ad7793.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/iio/adc/ad7793.c b/drivers/iio/adc/ad7793.c
> > index e6706a09e100..47c3d7f32900 100644
> > --- a/drivers/iio/adc/ad7793.c
> > +++ b/drivers/iio/adc/ad7793.c
> > @@ -257,7 +257,7 @@ static int ad7793_setup(struct iio_dev *indio_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 *indio_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 */
> >
>
> --
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