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

[Krzysztof Kozlowski <k.kozlowski@samsung.com>]

On pią, 2014-10-10 at 17:45 +0900, Chanwoo Choi wrote:
> On 10/10/2014 05:22 PM, 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(+)
> > 
> > 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;
> > +		}
> > +	}
> > +
> 
> No,
> The extcon-max77693 driver cannot enable IRQ_CHARGER/TOP/FLASH
> because MAX77693_PMIC_REG_INTSRC_MASK register is common register of MAX77693.
> 
> The IRQ_CHARGER/TOP/FLASH of MAX77693_PMIC_REG_INTSRC_MASK register should be enabled
> in drivers/mfd/max77693.c.

The code above unmasks only SRC_IRQ_MUIC. Other bits are not touched.
Why do you think that other IRQs will be enabled?

Best regards,
Krzysztof

> 
> >  	/* 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)
> >