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

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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@xxxxxxxxxxxx>
---
  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.

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




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