[PATCH v1] pinctrl: amd: Fix hibernation support with CONFIG_SUSPEND unset

Rafael J. Wysocki
2025-04-30T18:27:49Z

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

After recent changes, pinctrl-amd will not support hibernation when
CONFIG_HIBERNATION is set and CONFIG_SUSPEND isn't because it will not
register amd_gpio_pm_ops then.

Address this by restoring dependencies on CONFIG_PM_SLEEP where
necessary for hibernation support.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

Mario, this is on top of:

https://patchwork.kernel.org/project/linux-acpi/patch/20250414203551.779320-1-superm1@kernel.org/

which is currently in my bleeding-edge branch only.

---
drivers/pinctrl/pinctrl-amd.c | 63 ++++++++++++++++++++++++------------------
1 file changed, 36 insertions(+), 27 deletions(-)

--- a/drivers/pinctrl/pinctrl-amd.c
+++ b/drivers/pinctrl/pinctrl-amd.c
@@ -894,26 +894,7 @@
}
}

-#ifdef CONFIG_SUSPEND
-static bool amd_gpio_should_save(struct amd_gpio *gpio_dev, unsigned int pin)
-{
- const struct pin_desc *pd = pin_desc_get(gpio_dev->pctrl, pin);
-
- if (!pd)
- return false;
-
- /*
- * Only restore the pin if it is actually in use by the kernel (or
- * by userspace).
- */
- if (pd->mux_owner || pd->gpio_owner ||
- gpiochip_line_is_irq(&gpio_dev->gc, pin))
- return true;
-
- return false;
-}
-
-#ifdef CONFIG_ACPI
+#if defined(CONFIG_SUSPEND) && defined(CONFIG_ACPI)
static void amd_gpio_check_pending(void)
{
struct amd_gpio *gpio_dev = pinctrl_dev;
@@ -936,8 +917,40 @@
static struct acpi_s2idle_dev_ops pinctrl_amd_s2idle_dev_ops = {
.check = amd_gpio_check_pending,
};
+
+static void amd_gpio_register_s2idle_ops(void)
+{
+ acpi_register_lps0_dev(&pinctrl_amd_s2idle_dev_ops);
+}
+
+static void amd_gpio_unregister_s2idle_ops(void)
+{
+ acpi_unregister_lps0_dev(&pinctrl_amd_s2idle_dev_ops);
+}
+#else
+static inline void amd_gpio_register_s2idle_ops(void) {}
+static inline void amd_gpio_unregister_s2idle_ops(void) {}
#endif

+#ifdef CONFIG_PM_SLEEP
+static bool amd_gpio_should_save(struct amd_gpio *gpio_dev, unsigned int pin)
+{
+ const struct pin_desc *pd = pin_desc_get(gpio_dev->pctrl, pin);
+
+ if (!pd)
+ return false;
+
+ /*
+ * Only restore the pin if it is actually in use by the kernel (or
+ * by userspace).
+ */
+ if (pd->mux_owner || pd->gpio_owner ||
+ gpiochip_line_is_irq(&gpio_dev->gc, pin))
+ return true;
+
+ return false;
+}
+
static int amd_gpio_suspend_hibernate_common(struct device *dev, bool is_suspend)
{
struct amd_gpio *gpio_dev = dev_get_drvdata(dev);
@@ -1211,9 +1224,7 @@

platform_set_drvdata(pdev, gpio_dev);
acpi_register_wakeup_handler(gpio_dev->irq, amd_gpio_check_wake, gpio_dev);
-#if defined(CONFIG_ACPI) && defined(CONFIG_SUSPEND)
- acpi_register_lps0_dev(&pinctrl_amd_s2idle_dev_ops);
-#endif
+ amd_gpio_register_s2idle_ops();

dev_dbg(&pdev->dev, "amd gpio driver loaded\n");
return ret;
@@ -1232,9 +1243,7 @@

gpiochip_remove(&gpio_dev->gc);
acpi_unregister_wakeup_handler(amd_gpio_check_wake, gpio_dev);
-#if defined(CONFIG_ACPI) && defined(CONFIG_SUSPEND)
- acpi_unregister_lps0_dev(&pinctrl_amd_s2idle_dev_ops);
-#endif
+ amd_gpio_unregister_s2idle_ops();
}

#ifdef CONFIG_ACPI
@@ -1251,7 +1260,7 @@
.driver = {
.name = "amd_gpio",
.acpi_match_table = ACPI_PTR(amd_gpio_acpi_match),
-#ifdef CONFIG_SUSPEND
+#ifdef CONFIG_PM_SLEEP
.pm = &amd_gpio_pm_ops,
#endif
},