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SubjectRe: [PATCH] iio: adis16480: fix FNCTIO_CTRL corruption when enabling IRQ
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Hi,

Hm, right. But the intention of the driver is to use DIO1. Changing this to
DIO2 by default will break all existing users.

This change should be part of a patch which allows to configure which
interrupt output to use and also the interrupt polarity.

- Lars

On 03/09/2016 12:39 PM, Vlad Banea wrote:
> Hi,
>
> Thanks for your answer. I'm using this driver with the ADIS16485 device and
> the default value for this register is 0x000D:
> http://www.analog.com/media/en/technical-documentation/data-sheets/ADIS16485.pdf
> (Table 89)
>
> When the driver enables the interrupt, the Data Ready Line selection and
> polarity are changed, and I never receive the interrupt.
>
> Vlad
>
>
> On Wed, Mar 9, 2016 at 4:22 AM, Lars-Peter Clausen <lars@metafoo.de
> <mailto:lars@metafoo.de>> wrote:
>
> On 03/09/2016 06:28 AM, Vlad Banea wrote:
> > Enabling the IRQ should leave all other settings in the FNCTIO_CTRL
> > register untouched: read the whole register, toggle just the enable bit,
> > before writing it back.
>
> Hi,
>
> Thanks for the patch. Looks good in general, but it's not a fix. The driver
> does not write this register anywhere else and the reset default value is
> 0x00. So we don't corrupt any other settings since, 0x00 and BIT(3) are the
> only two settings the driver does at the moment.
>
> If the patch is in preparation of future changes that are going to set/clear
> other bits of the register this should be noted in the commit message.
>
> The reason I'm so pedantic here is because fix generally means that the
> patch needs to be backported to older kernel versions, which is not the case
> here.
>
> - Lars
>
>
> > ---
> > drivers/iio/imu/adis16480.c | 15 +++++++++++++--
> > 1 file changed, 13 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/iio/imu/adis16480.c b/drivers/iio/imu/adis16480.c
> > index b94bfd3..8473859 100644
> > --- a/drivers/iio/imu/adis16480.c
> > +++ b/drivers/iio/imu/adis16480.c
> > @@ -738,8 +738,19 @@ static int adis16480_stop_device(struct iio_dev
> *indio_dev)
> >
> > static int adis16480_enable_irq(struct adis *adis, bool enable)
> > {
> > - return adis_write_reg_16(adis, ADIS16480_REG_FNCTIO_CTRL,
> > - enable ? BIT(3) : 0);
> > + u16 fnctio_ctrl;
> > + int ret;
> > +
> > + ret = adis_read_reg_16(adis, ADIS16480_REG_FNCTIO_CTRL,
> &fnctio_ctrl);
> > + if (ret < 0)
> > + return ret;
> > +
> > + if (enable)
> > + fnctio_ctrl |= BIT(3);
> > + else
> > + fnctio_ctrl &= ~BIT(3);
> > +
> > + return adis_write_reg_16(adis, ADIS16480_REG_FNCTIO_CTRL,
> fnctio_ctrl);
> > }
> >
> > static int adis16480_initial_setup(struct iio_dev *indio_dev)
> >
>
>

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