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SubjectRe: [PATCH] gpio: pca953x: Clear irq trigger type on irq shutdown
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On Wed, 2018-05-16 at 14:51 +0200, Linus Walleij wrote:
> On Fri, May 4, 2018 at 6:53 PM, Grigoryev Denis <grigoryev@fastwel.ru>
> wrote:
>

If it's full context below, the patch looks good enough to me (assuming
it works and doesn't break things on other chips like PCAL variants).

Though, I didn't read the code carefully (not enough time this week).
Thus, FWIW,

Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

with above caveats in mind.

> > The driver stores the result of irq_set_type() in the internal
> > variables
> > irq_trig_raise and irq_trig_fall, which later are used to determine
> > the GPIOs that must be re-configured as input. These variables
> > retain their
> > value between gpiolib's export / unexport, resulting in an
> > incorrect
> > state in some cases. The corresponding bits in the variables
> > irq_trig_raise and irq_trig_fall should be cleared in
> > irq_shutdown().
> >
> > Signed-off-by: Denis Grigoryev <grigoryev@fastwel.ru>
> > ---
> > drivers/gpio/gpio-pca953x.c | 10 ++++++++++
> > 1 file changed, 10 insertions(+)
> >
> > diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-
> > pca953x.c
> > index d2ead4b..b41be8c 100644
> > --- a/drivers/gpio/gpio-pca953x.c
> > +++ b/drivers/gpio/gpio-pca953x.c
> > @@ -522,6 +522,15 @@ static int pca953x_irq_set_type(struct irq_data
> > *d, unsigned int type)
> > return 0;
> > }
> >
> > +static void pca953x_irq_shutdown(struct irq_data *d)
> > +{
> > + struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
> > + u8 mask = 1 << (d->hwirq % BANK_SZ);
> > +
> > + chip->irq_trig_raise[d->hwirq / BANK_SZ] &= ~mask;
> > + chip->irq_trig_fall[d->hwirq / BANK_SZ] &= ~mask;
> > +}
> > +
> > static struct irq_chip pca953x_irq_chip = {
> > .name = "pca953x",
> > .irq_mask = pca953x_irq_mask,
> > @@ -529,6 +538,7 @@ static struct irq_chip pca953x_irq_chip = {
> > .irq_bus_lock = pca953x_irq_bus_lock,
> > .irq_bus_sync_unlock = pca953x_irq_bus_sync_unlock,
> > .irq_set_type = pca953x_irq_set_type,
> > + .irq_shutdown = pca953x_irq_shutdown,
> > };
>
> This driver has a big set of users, so putting some maintainers
> in the loop so we can get some patch review.
>
> Yours,
> Linus Walleij

--
Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Intel Finland Oy

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