Re: [PATCH] pinctrl: amd: Disable and mask interrupts on resume

["Kornel Dulęba" <korneld@chromium.org>]

On Mon, Apr 10, 2023 at 5:29 PM Gong, Richard <richard.gong@amd.com> wrote:
>
> On 4/10/2023 12:03 AM, Mario Limonciello wrote:
> > On 3/20/23 04:32, Kornel Dulęba wrote:
> >
> >> This fixes a similar problem to the one observed in:
> >> commit 4e5a04be88fe ("pinctrl: amd: disable and mask interrupts on
> >> probe").
> >>
> >> On some systems, during suspend/resume cycle firmware leaves
> >> an interrupt enabled on a pin that is not used by the kernel.
> >> This confuses the AMD pinctrl driver and causes spurious interrupts.
> >>
> >> The driver already has logic to detect if a pin is used by the kernel.
> >> Leverage it to re-initialize interrupt fields of a pin only if it's not
> >> used by us.
> >>
> >> Signed-off-by: Kornel Dulęba <korneld@chromium.org>
> >> ---
> >>   drivers/pinctrl/pinctrl-amd.c | 36 +++++++++++++++++++----------------
> >>   1 file changed, 20 insertions(+), 16 deletions(-)
> >>
> >> diff --git a/drivers/pinctrl/pinctrl-amd.c
> >> b/drivers/pinctrl/pinctrl-amd.c
> >> index 9236a132c7ba..609821b756c2 100644
> >> --- a/drivers/pinctrl/pinctrl-amd.c
> >> +++ b/drivers/pinctrl/pinctrl-amd.c
> >> @@ -872,32 +872,34 @@ static const struct pinconf_ops amd_pinconf_ops
> >> = {
> >>       .pin_config_group_set = amd_pinconf_group_set,
> >>   };
> >>   -static void amd_gpio_irq_init(struct amd_gpio *gpio_dev)
> >> +static void amd_gpio_irq_init_pin(struct amd_gpio *gpio_dev, int pin)
> >>   {
> >> -    struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
> >> +    const struct pin_desc *pd;
> >>       unsigned long flags;
> >>       u32 pin_reg, mask;
> >> -    int i;
> >>         mask = BIT(WAKE_CNTRL_OFF_S0I3) | BIT(WAKE_CNTRL_OFF_S3) |
> >>           BIT(INTERRUPT_MASK_OFF) | BIT(INTERRUPT_ENABLE_OFF) |
> >>           BIT(WAKE_CNTRL_OFF_S4);
> >>   -    for (i = 0; i < desc->npins; i++) {
> >> -        int pin = desc->pins[i].number;
> >> -        const struct pin_desc *pd = pin_desc_get(gpio_dev->pctrl, pin);
> >> -
> >> -        if (!pd)
> >> -            continue;
> >> +    pd = pin_desc_get(gpio_dev->pctrl, pin);
> >> +    if (!pd)
> >> +        return;
> >>   -        raw_spin_lock_irqsave(&gpio_dev->lock, flags);
> >> +    raw_spin_lock_irqsave(&gpio_dev->lock, flags);
> >> +    pin_reg = readl(gpio_dev->base + pin * 4);
> >> +    pin_reg &= ~mask;
> >> +    writel(pin_reg, gpio_dev->base + pin * 4);
> >> +    raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
> >> +}
> >>   -        pin_reg = readl(gpio_dev->base + i * 4);
> >> -        pin_reg &= ~mask;
> >> -        writel(pin_reg, gpio_dev->base + i * 4);
> >> +static void amd_gpio_irq_init(struct amd_gpio *gpio_dev)
> >> +{
> >> +    struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
> >> +    int i;
> >>   -        raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
> >> -    }
> >> +    for (i = 0; i < desc->npins; i++)
> >> +        amd_gpio_irq_init_pin(gpio_dev, i);
> >>   }
> >>     #ifdef CONFIG_PM_SLEEP
> >> @@ -950,8 +952,10 @@ static int amd_gpio_resume(struct device *dev)
> >>       for (i = 0; i < desc->npins; i++) {
> >>           int pin = desc->pins[i].number;
> >>   -        if (!amd_gpio_should_save(gpio_dev, pin))
> >> +        if (!amd_gpio_should_save(gpio_dev, pin)) {
> >> +            amd_gpio_irq_init_pin(gpio_dev, pin);
> >>               continue;
> >> +        }
> >>             raw_spin_lock_irqsave(&gpio_dev->lock, flags);
> >>           gpio_dev->saved_regs[i] |= readl(gpio_dev->base + pin * 4)
> >> & PIN_IRQ_PENDING;
> >
> > Hello Kornel,
> >
> > I've found that this commit which was included in 6.3-rc5 is causing a
> > regression waking up from lid on a Lenovo Z13.
> observed "unable to wake from power button" on AMD based Dell platform.
> Reverting "pinctrl: amd: Disable and mask interrupts on resume" on the
> top of 6.3-rc6 does fix the issue.

Whoops, sorry for the breakage.
Could you please share the output of "/sys/kernel/debug/gpio" before
and after the first suspend/resume cycle.
I've looked at the patch again and found a rather silly mistake.
Please try the following.
Note that I don't have access to hardware with this controller at the
moment, so I've only compile tested it.

diff --git a/drivers/pinctrl/pinctrl-amd.c b/drivers/pinctrl/pinctrl-amd.c
index 609821b756c2..7e7770152ca8 100644
--- a/drivers/pinctrl/pinctrl-amd.c
+++ b/drivers/pinctrl/pinctrl-amd.c
@@ -899,7 +899,7 @@ static void amd_gpio_irq_init(struct amd_gpio *gpio_dev)
        int i;

        for (i = 0; i < desc->npins; i++)
-               amd_gpio_irq_init_pin(gpio_dev, i);
+               amd_gpio_irq_init_pin(gpio_dev, desc->pins[i].number);
 }


> >
> > Reverting it on top of 6.3-rc6 resolves the problem.
> >
> > I've collected what I can into this bug report:
> >
> > https://bugzilla.kernel.org/show_bug.cgi?id=217315
> >
> > Linus Walleij,
> >
> > It looks like this was CC to stable.  If we can't get a quick solution
> > we might want to pull this from stable.
>
> this commit landed into 6.1.23 as well
>
>          d9c63daa576b2 pinctrl: amd: Disable and mask interrupts on resume
>
> >
> > Thanks,
> >
> >
> Regards,
>
> Richard
>