linux-kernel - Re: [PATCH] soc: mediatek: Move the initial setting of pmic wrap interrupt before requesting irq.

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Date:	Wed, 9 Sep 2015 22:04:56 +0800
From:	Henry Chen <HenryC.Chen@...iatek.com>
To:	Sascha Hauer <s.hauer@...gutronix.de>
CC:	Matthias Brugger <matthias.bgg@...il.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-mediatek@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] soc: mediatek: Move the initial setting of pmic wrap
 interrupt before requesting irq.

Hi Sascha,

On Mon, 2015-09-07 at 07:39 +0200, Sascha Hauer wrote:
> On Fri, Sep 04, 2015 at 12:05:12PM +0800, Henry Chen wrote:
> > Seperate the initialization of pmic wrap interrupt from pmic wrap init to make sure setting is correct before requesting irq.
> 
> It seems the problem this patch solves is the missing watchdog
> initialization when the pwrap is already initialized but the watchdog is
> not, so how about a commit log like:
> 
> "The watchdog may not be initialized by the bootloader, even if the rest
> of the pwrap is. Move the watchdog initialization out of pwrap_init()
> to make sure the watchdog is always initialized and not only when the
> pwrap is uninitialized."
> 
> Also please add linebreaks to the commit log.
> 

Yes, thanks for explanation, I will add this on commit log make it more
clearly to understand.

Henry

> > 
> > Signed-off-by: Henry Chen <henryc.chen@...iatek.com>
> > ---
> >  drivers/soc/mediatek/mtk-pmic-wrap.c | 14 ++++++++++----
> >  1 file changed, 10 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/soc/mediatek/mtk-pmic-wrap.c b/drivers/soc/mediatek/mtk-pmic-wrap.c
> > index f432291..c91d629 100644
> > --- a/drivers/soc/mediatek/mtk-pmic-wrap.c
> > +++ b/drivers/soc/mediatek/mtk-pmic-wrap.c
> > @@ -725,10 +725,6 @@ static int pwrap_init(struct pmic_wrapper *wrp)
> >  	pwrap_writel(wrp, 0x1, PWRAP_WACS2_EN);
> >  	pwrap_writel(wrp, 0x5, PWRAP_STAUPD_PRD);
> >  	pwrap_writel(wrp, 0xff, PWRAP_STAUPD_GRPEN);
> > -	pwrap_writel(wrp, 0xf, PWRAP_WDT_UNIT);
> > -	pwrap_writel(wrp, 0xffffffff, PWRAP_WDT_SRC_EN);
> > -	pwrap_writel(wrp, 0x1, PWRAP_TIMER_EN);
> > -	pwrap_writel(wrp, ~((1 << 31) | (1 << 1)), PWRAP_INT_EN);
> >  
> >  	if (pwrap_is_mt8135(wrp)) {
> >  		/* enable pwrap events and pwrap bridge in AP side */
> > @@ -896,6 +892,16 @@ static int pwrap_probe(struct platform_device *pdev)
> >  		return -ENODEV;
> >  	}
> >  
> > +	/*
> > +	 * watch dog@...ap,
> > +	 * The bootloader may not initial the wdt/interrupt setting of pwrap,
> > +	 * set it before reguesting the irq.
> > +	 */
> 
> /* initialize watchdog, may not be done by the bootloader */
> 
> Sascha
> 


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