linux-kernel - Re: [PATCH v2] ARM: imx6: mask all interrupts before calling stby-poweroff sequence

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Message-ID: <20210928133938.GG18181@pengutronix.de>
Date:   Tue, 28 Sep 2021 15:39:38 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        linux-kernel@...r.kernel.org, linux-imx@....com,
        kernel@...gutronix.de, Fabio Estevam <festevam@...il.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] ARM: imx6: mask all interrupts before calling
 stby-poweroff sequence

On Tue, Sep 21, 2021 at 07:57:49PM -0700, Florian Fainelli wrote:
> 
> 
> On 9/21/2021 7:37 PM, Shawn Guo wrote:
> > On Tue, Aug 17, 2021 at 02:25:00PM +0200, Oleksij Rempel wrote:
> > > Any pending interrupt can prevent entering standby based power off state.
> > > To avoid it, mask all interrupts.
> > > 
> > > Fixes: 8148d2136002 ("ARM: imx6: register pm_power_off handler if "fsl,pmic-stby-poweroff" is set")
> > > Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> > > ---
> > >   arch/arm/mach-imx/pm-imx6.c | 23 +++++++++++++++++++++++
> > >   1 file changed, 23 insertions(+)
> > > 
> > > diff --git a/arch/arm/mach-imx/pm-imx6.c b/arch/arm/mach-imx/pm-imx6.c
> > > index 9244437cb1b9..63887ade411a 100644
> > > --- a/arch/arm/mach-imx/pm-imx6.c
> > > +++ b/arch/arm/mach-imx/pm-imx6.c
> > > @@ -59,8 +59,11 @@
> > >   #define MX6Q_SUSPEND_OCRAM_SIZE		0x1000
> > >   #define MX6_MAX_MMDC_IO_NUM		33
> > > +#define GIC_DIST_ENABLE_CLEAR		0x180
> > > +
> > >   static void __iomem *ccm_base;
> > >   static void __iomem *suspend_ocram_base;
> > > +static void __iomem *gic_raw_dist_base;
> > >   static void (*imx6_suspend_in_ocram_fn)(void __iomem *ocram_vbase);
> > >   /*
> > > @@ -592,6 +595,7 @@ static int __init imx6q_suspend_init(const struct imx6_pm_socdata *socdata)
> > >   static void __init imx6_pm_common_init(const struct imx6_pm_socdata
> > >   					*socdata)
> > >   {
> > > +	struct device_node *np;
> > >   	struct regmap *gpr;
> > >   	int ret;
> > > @@ -615,10 +619,29 @@ static void __init imx6_pm_common_init(const struct imx6_pm_socdata
> > >   	if (!IS_ERR(gpr))
> > >   		regmap_update_bits(gpr, IOMUXC_GPR1, IMX6Q_GPR1_GINT,
> > >   				   IMX6Q_GPR1_GINT);
> > > +
> > > +	np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-gic");
> > > +	gic_raw_dist_base = of_iomap(np, 0);
> > > +}
> > > +
> > > +static void imx_gic_mask_all(void)
> > > +{
> > > +	int i;
> > > +
> > > +	if (WARN_ON(!gic_raw_dist_base))
> > > +		return;
> > > +
> > > +	for (i = 0; i < 4; i++)
> > > +		writel_relaxed(~0, gic_raw_dist_base + GIC_DIST_ENABLE_CLEAR + 4 * i);
> > 
> > Is it possible to have a helper function in GIC driver, that we can
> > simply call into?
> 
> Cannot you call gic_cpu_if_down(0) which would presumably have the same
> effect?

Good idea, thank you! It works.

Regards,
Oleksij
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