linux-kernel - Re: [PATCH v12 1/6] mfd: mt6397: Modify suspend/resume behavior

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Date:   Mon, 20 Apr 2020 18:52:39 +0800
From:   Hsin-hsiung Wang <hsin-hsiung.wang@...iatek.com>
To:     Lee Jones <lee.jones@...aro.org>
CC:     Mark Rutland <mark.rutland@....com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        <linux-kernel@...r.kernel.org>,
        "Richard Fontana" <rfontana@...hat.com>,
        <linux-rtc@...r.kernel.org>,
        Nicolas Boichat <drinkcat@...omium.org>,
        <linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Ran Bi <ran.bi@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>,
        "Rob Herring" <robh+dt@...nel.org>,
        <linux-mediatek@...ts.infradead.org>,
        "Matthias Brugger" <matthias.bgg@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Eddie Huang <eddie.huang@...iatek.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Josef Friedl <josef.friedl@...ed.at>,
        <srv_heupstream@...iatek.com>, Sebastian Reichel <sre@...nel.org>
Subject: Re: [PATCH v12 1/6] mfd: mt6397: Modify suspend/resume behavior

Hi,

On Thu, 2020-04-16 at 09:49 +0100, Lee Jones wrote:
> On Wed, 08 Apr 2020, Hsin-Hsiung Wang wrote:
> 
> > Some pmics don't need backup interrupt settings, so we change to use
> > pm notifier for the pmics which are necessary to store settings.
> > 
> > Signed-off-by: Hsin-Hsiung Wang <hsin-hsiung.wang@...iatek.com>
> > ---
> >  drivers/mfd/mt6397-core.c       | 30 ------------------------------
> >  drivers/mfd/mt6397-irq.c        | 35 ++++++++++++++++++++++++++++++++++-
> >  include/linux/mfd/mt6397/core.h |  2 ++
> >  3 files changed, 36 insertions(+), 31 deletions(-)
> > 
> > diff --git a/drivers/mfd/mt6397-core.c b/drivers/mfd/mt6397-core.c
> > index 0437c85..d2e70d8 100644
> > --- a/drivers/mfd/mt6397-core.c
> > +++ b/drivers/mfd/mt6397-core.c
> > @@ -100,35 +100,6 @@ static const struct mfd_cell mt6397_devs[] = {
> >  	}
> >  };
> >  
> > -#ifdef CONFIG_PM_SLEEP
> > -static int mt6397_irq_suspend(struct device *dev)
> > -{
> > -	struct mt6397_chip *chip = dev_get_drvdata(dev);
> > -
> > -	regmap_write(chip->regmap, chip->int_con[0], chip->wake_mask[0]);
> > -	regmap_write(chip->regmap, chip->int_con[1], chip->wake_mask[1]);
> > -
> > -	enable_irq_wake(chip->irq);
> > -
> > -	return 0;
> > -}
> > -
> > -static int mt6397_irq_resume(struct device *dev)
> > -{
> > -	struct mt6397_chip *chip = dev_get_drvdata(dev);
> > -
> > -	regmap_write(chip->regmap, chip->int_con[0], chip->irq_masks_cur[0]);
> > -	regmap_write(chip->regmap, chip->int_con[1], chip->irq_masks_cur[1]);
> > -
> > -	disable_irq_wake(chip->irq);
> > -
> > -	return 0;
> > -}
> > -#endif
> > -
> > -static SIMPLE_DEV_PM_OPS(mt6397_pm_ops, mt6397_irq_suspend,
> > -			mt6397_irq_resume);
> > -
> >  struct chip_data {
> >  	u32 cid_addr;
> >  	u32 cid_shift;
> > @@ -238,7 +209,6 @@ static struct platform_driver mt6397_driver = {
> >  	.driver = {
> >  		.name = "mt6397",
> >  		.of_match_table = of_match_ptr(mt6397_of_match),
> > -		.pm = &mt6397_pm_ops,
> >  	},
> >  	.id_table = mt6397_id,
> >  };
> > diff --git a/drivers/mfd/mt6397-irq.c b/drivers/mfd/mt6397-irq.c
> > index b2d3ce1..2924919 100644
> > --- a/drivers/mfd/mt6397-irq.c
> > +++ b/drivers/mfd/mt6397-irq.c
> > @@ -9,6 +9,7 @@
> >  #include <linux/of_irq.h>
> >  #include <linux/platform_device.h>
> >  #include <linux/regmap.h>
> > +#include <linux/suspend.h>
> >  #include <linux/mfd/mt6323/core.h>
> >  #include <linux/mfd/mt6323/registers.h>
> >  #include <linux/mfd/mt6397/core.h>
> > @@ -81,7 +82,7 @@ static struct irq_chip mt6397_irq_chip = {
> >  static void mt6397_irq_handle_reg(struct mt6397_chip *mt6397, int reg,
> >  				  int irqbase)
> >  {
> > -	unsigned int status;
> > +	unsigned int status = 0;
> 
> This looks like an unrelated change, no?
> 

It is to fix the coverity defect.

> >  	int i, irq, ret;
> >  
> >  	ret = regmap_read(mt6397->regmap, reg, &status);
> > @@ -128,6 +129,36 @@ static const struct irq_domain_ops mt6397_irq_domain_ops = {
> >  	.map = mt6397_irq_domain_map,
> >  };
> 
> Other than that.
> 
> For my own reference:
>   Acked-for-MFD-by: Lee Jones <lee.jones@...aro.org>
> 
Thanks for your review. I will add it in the next version.