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

[Florian Fainelli]

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@xxxxxxxxxxxxxx>
> > ---
> >   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?
--
Florian