Re: [PATCH v2] pinctrl: amd: Take suspend type into consideration which pins are non-wake

[Mario Limonciello <mario.limonciello@amd.com>]

On 1/6/2025 11:41, Maciej S. Szmigiero wrote:
> Some laptops have pins which are a wake source for S0i3/S3 but which
> aren't a wake source for S4/S5 and which cause issues when left unmasked
> during hibernation (S4).
> 
> For example HP EliteBook 855 G7 has pin #24 that causes instant wakeup
> (hibernation failure) if left unmasked (it is a wake source only for
> S0i3/S3).
> GPIO pin #24 on this platform is likely dedicated to WWAN XMM7360
> modem since this pin triggers wake notify to WWAN modem's parent PCIe
> port.
> 
> Fix this by considering a pin a wake source only if it is marked as one
> for the current suspend type (S0i3/S3 vs S4/S5).
> 
> Since Z-wake pins only make sense at runtime these were excluded from
> both of suspend categories, so pins with only the Z-wake flag set are
> effectively treated as non-wake pins.
> 
> Fixes: 2fff0b5e1a6b ("pinctrl: amd: Mask non-wake source pins with interrupt enabled at suspend")
> Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>

Thanks!

Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>

> ---
> 
> Changes from v1:
> * Clarify that Z pins only make sense at runtime in the commit message.
> 
> * Clarify what GPIO pin #24 is likely for on the test platform in the
> commit message.
> 
> * Rename S03 and S4 to, respetively, suspend and hibernate.
> 
>   drivers/pinctrl/pinctrl-amd.c | 27 +++++++++++++++++++++------
>   drivers/pinctrl/pinctrl-amd.h |  7 +++----
>   2 files changed, 24 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-amd.c b/drivers/pinctrl/pinctrl-amd.c
> index fff6d4209ad5..a03feb5a60dd 100644
> --- a/drivers/pinctrl/pinctrl-amd.c
> +++ b/drivers/pinctrl/pinctrl-amd.c
> @@ -908,12 +908,13 @@ static bool amd_gpio_should_save(struct amd_gpio *gpio_dev, unsigned int pin)
>   	return false;
>   }
>   
> -static int amd_gpio_suspend(struct device *dev)
> +static int amd_gpio_suspend_hibernate_common(struct device *dev, bool is_suspend)
>   {
>   	struct amd_gpio *gpio_dev = dev_get_drvdata(dev);
>   	struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
>   	unsigned long flags;
>   	int i;
> +	u32 wake_mask = is_suspend ? WAKE_SOURCE_SUSPEND : WAKE_SOURCE_HIBERNATE;
>   
>   	for (i = 0; i < desc->npins; i++) {
>   		int pin = desc->pins[i].number;
> @@ -925,11 +926,11 @@ static int amd_gpio_suspend(struct device *dev)
>   		gpio_dev->saved_regs[i] = readl(gpio_dev->base + pin * 4) & ~PIN_IRQ_PENDING;
>   
>   		/* mask any interrupts not intended to be a wake source */
> -		if (!(gpio_dev->saved_regs[i] & WAKE_SOURCE)) {
> +		if (!(gpio_dev->saved_regs[i] & wake_mask)) {
>   			writel(gpio_dev->saved_regs[i] & ~BIT(INTERRUPT_MASK_OFF),
>   			       gpio_dev->base + pin * 4);
> -			pm_pr_dbg("Disabling GPIO #%d interrupt for suspend.\n",
> -				  pin);
> +			pm_pr_dbg("Disabling GPIO #%d interrupt for %s.\n",
> +				  pin, is_suspend ? "suspend" : "hibernate");
>   		}
>   
>   		raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
> @@ -938,6 +939,16 @@ static int amd_gpio_suspend(struct device *dev)
>   	return 0;
>   }
>   
> +static int amd_gpio_suspend(struct device *dev)
> +{
> +	return amd_gpio_suspend_hibernate_common(dev, true);
> +}
> +
> +static int amd_gpio_hibernate(struct device *dev)
> +{
> +	return amd_gpio_suspend_hibernate_common(dev, false);
> +}
> +
>   static int amd_gpio_resume(struct device *dev)
>   {
>   	struct amd_gpio *gpio_dev = dev_get_drvdata(dev);
> @@ -961,8 +972,12 @@ static int amd_gpio_resume(struct device *dev)
>   }
>   
>   static const struct dev_pm_ops amd_gpio_pm_ops = {
> -	SET_LATE_SYSTEM_SLEEP_PM_OPS(amd_gpio_suspend,
> -				     amd_gpio_resume)
> +	.suspend_late = amd_gpio_suspend,
> +	.resume_early = amd_gpio_resume,
> +	.freeze_late = amd_gpio_hibernate,
> +	.thaw_early = amd_gpio_resume,
> +	.poweroff_late = amd_gpio_hibernate,
> +	.restore_early = amd_gpio_resume,
>   };
>   #endif
>   
> diff --git a/drivers/pinctrl/pinctrl-amd.h b/drivers/pinctrl/pinctrl-amd.h
> index 667be49c3f48..3a1e5bffaf6e 100644
> --- a/drivers/pinctrl/pinctrl-amd.h
> +++ b/drivers/pinctrl/pinctrl-amd.h
> @@ -80,10 +80,9 @@
>   #define FUNCTION_MASK		GENMASK(1, 0)
>   #define FUNCTION_INVALID	GENMASK(7, 0)
>   
> -#define WAKE_SOURCE	(BIT(WAKE_CNTRL_OFF_S0I3) | \
> -			 BIT(WAKE_CNTRL_OFF_S3)   | \
> -			 BIT(WAKE_CNTRL_OFF_S4)   | \
> -			 BIT(WAKECNTRL_Z_OFF))
> +#define WAKE_SOURCE_SUSPEND  (BIT(WAKE_CNTRL_OFF_S0I3) | \
> +			      BIT(WAKE_CNTRL_OFF_S3))
> +#define WAKE_SOURCE_HIBERNATE BIT(WAKE_CNTRL_OFF_S4)
>   
>   struct amd_function {
>   	const char *name;