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

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Date:   Tue, 21 Sep 2021 19:57:49 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Shawn Guo <shawnguo@...nel.org>,
        Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Sascha Hauer <s.hauer@...gutronix.de>, kernel@...gutronix.de,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Fabio Estevam <festevam@...il.com>, linux-imx@....com
Subject: Re: [PATCH v2] ARM: imx6: mask all interrupts before calling
 stby-poweroff sequence



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?
-- 
Florian