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

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Message-ID: <CAD=NsqyAXK0z7XqVy=coSm40zOe0yS+h=oiDD8a-udDT5WKMdw@mail.gmail.com>
Date:   Mon, 10 Apr 2023 18:32:58 +0200
From:   Kornel Dulęba <korneld@...omium.org>
To:     "Gong, Richard" <richard.gong@....com>
Cc:     Mario Limonciello <mario.limonciello@....com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        regressions@...mhuis.info,
        Basavaraj Natikar <Basavaraj.Natikar@....com>,
        Shyam Sundar S K <Shyam-sundar.S-k@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        upstream@...ihalf.com, rad@...ihalf.com, mattedavis@...gle.com,
        gregkh@...uxfoundation.org, stable@...r.kernel.org
Subject: Re: [PATCH] pinctrl: amd: Disable and mask interrupts on resume

On Mon, Apr 10, 2023 at 6:17 PM Kornel Dulęba <korneld@...omium.org> wrote:
>
> On Mon, Apr 10, 2023 at 5:29 PM Gong, Richard <richard.gong@....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@...omium.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.
Oh and also I'd need to compare the output from this with and without
this patch reverted.
> 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
> >