Re: [PATCH fixes 2/2] extcon: max77693: Fix always masked MUIC interrupts

Krzysztof Kozlowski
2014-10-10T09:02:04Z

On pią, 2014-10-10 at 09:58 +0100, Lee Jones wrote:
> On Fri, 10 Oct 2014, Krzysztof Kozlowski wrote:
>
> > All interrupts coming from MUIC were ignored because interrupt source
> > register was masked.
> >
> > The Maxim 77693 has a "interrupt source" - a separate register and interrupts
> > which give information about PMIC block triggering the individual
> > interrupt (charger, topsys, MUIC, flash LED).
> >
> > By default bootloader could initialize this register to "mask all"
> > value. In such case (observed on Trats2 board) MUIC interrupts won't be
> > generated regardless of their mask status. Regmap irq chip was unmasking
> > individual MUIC interrupts but the source was masked
> >
> > Before introducing regmap irq chip this interrupt source was unmasked,
> > read and acked. Reading and acking is not necessary but unmasking is. Do
> > it in extcon driver.
> >
> > Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
> > Cc: <stable@vger.kernel.org>
> > Fixes: 342d669c1ee4 ("mfd: max77693: Handle IRQs using regmap")
> > ---
> > drivers/extcon/extcon-max77693.c | 16 ++++++++++++++++
> > include/linux/mfd/max77693-private.h | 5 +++++
> > 2 files changed, 21 insertions(+)
>
> Did you run this through checkpatch?

Yes, no complains.

> > diff --git a/drivers/extcon/extcon-max77693.c b/drivers/extcon/extcon-max77693.c
> > index 490e27475bac..d3adacf3187f 100644
> > --- a/drivers/extcon/extcon-max77693.c
> > +++ b/drivers/extcon/extcon-max77693.c
> > @@ -1176,6 +1176,22 @@ static int max77693_muic_probe(struct platform_device *pdev)
> > }
> > }
> >
> > + if (i) {
> > + /*
> > + * i>0, at least one MUIC interrupt requested so need to unmask
> > + * MUIC interrupt in INTSRC register. Without that MUIC
> > + * interrupts will not be reported.
> > + */
> > + ret = regmap_update_bits(max77693->regmap,
> > + MAX77693_PMIC_REG_INTSRC_MASK, SRC_IRQ_MUIC,
> > + ~SRC_IRQ_MUIC);
> > + if (ret < 0) {
> > + dev_err(&pdev->dev, "Could not unmask MUIC interrupt in INTSRC: %d\n",
> > + ret);
> > + return ret;
> > + }
> > + }
> > +
> > /* Initialize extcon device */
> > info->edev = devm_extcon_dev_allocate(&pdev->dev,
> > max77693_extcon_cable);
> > diff --git a/include/linux/mfd/max77693-private.h b/include/linux/mfd/max77693-private.h
> > index e1b2b61285b9..4f1a80b66ecf 100644
> > --- a/include/linux/mfd/max77693-private.h
> > +++ b/include/linux/mfd/max77693-private.h
> > @@ -438,6 +438,11 @@ enum max77693_irq_source {
> > MAX77693_IRQ_GROUP_NR,
> > };
> >
> > +#define SRC_IRQ_CHARGER BIT(0)
> > +#define SRC_IRQ_TOP BIT(1)
> > +#define SRC_IRQ_FLASH BIT(2)
> > +#define SRC_IRQ_MUIC BIT(3)
> > +
> > #define LED_IRQ_FLED2_OPEN BIT(0)
> > #define LED_IRQ_FLED2_SHORT BIT(1)
> > #define LED_IRQ_FLED1_OPEN BIT(2)
>