[PATCH] pinctrl: pinctrl-intel: move gpio suspend/resume to noirq phase

[Binbin Wu]

In current driver, SET_LATE_SYSTEM_SLEEP_PM_OPS is used to install the
callbacks for suspend/resume.
GPIO pin may be used as the interrupt pin by some device. However, using
SET_LATE_SYSTEM_SLEEP_PM_OPS() to install the callbacks, the resume
callback is called after resume_device_irqs(). Unintended interrupts may
arrive due to resuming device irqs first, but the GPIO controller is not
properly restored.

Normally, for a SMP system, there are multiple cores, so even when there are
unintended interrupts, BSP gets the chance to init the gpio chip soon.
But when there is only 1 core is active (other cores are offlined or
single core) during resume, it is more easily to observe the unintended
interrupts.

This patch renames the suspend/resume function by adding suffix "_noirq",
and installs the callbacks using SET_NOIRQ_SYSTEM_SLEEP_PM_OPS().

Signed-off-by: Binbin Wu <binbin...@intel.com>
---
 drivers/pinctrl/intel/pinctrl-intel.c |  8 ++++----
 drivers/pinctrl/intel/pinctrl-intel.h | 11 ++++++-----
 2 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/pinctrl/intel/pinctrl-intel.c 
b/drivers/pinctrl/intel/pinctrl-intel.c
index 3b18181..70638b7 100644
--- a/drivers/pinctrl/intel/pinctrl-intel.c
+++ b/drivers/pinctrl/intel/pinctrl-intel.c
@@ -1466,7 +1466,7 @@ static bool intel_pinctrl_should_save(struct 
intel_pinctrl *pctrl, unsigned int
        return false;
 }
 
-int intel_pinctrl_suspend(struct device *dev)
+int intel_pinctrl_suspend_noirq(struct device *dev)
 {
        struct intel_pinctrl *pctrl = dev_get_drvdata(dev);
        struct intel_community_context *communities;
@@ -1505,7 +1505,7 @@ int intel_pinctrl_suspend(struct device *dev)
 
        return 0;
 }
-EXPORT_SYMBOL_GPL(intel_pinctrl_suspend);
+EXPORT_SYMBOL_GPL(intel_pinctrl_suspend_noirq);
 
 static void intel_gpio_irq_init(struct intel_pinctrl *pctrl)
 {
@@ -1527,7 +1527,7 @@ static void intel_gpio_irq_init(struct intel_pinctrl 
*pctrl)
        }
 }
 
-int intel_pinctrl_resume(struct device *dev)
+int intel_pinctrl_resume_noirq(struct device *dev)
 {
        struct intel_pinctrl *pctrl = dev_get_drvdata(dev);
        const struct intel_community_context *communities;
@@ -1589,7 +1589,7 @@ int intel_pinctrl_resume(struct device *dev)
 
        return 0;
 }
-EXPORT_SYMBOL_GPL(intel_pinctrl_resume);
+EXPORT_SYMBOL_GPL(intel_pinctrl_resume_noirq);
 #endif
 
 MODULE_AUTHOR("Mathias Nyman <mathias.ny...@linux.intel.com>");
diff --git a/drivers/pinctrl/intel/pinctrl-intel.h 
b/drivers/pinctrl/intel/pinctrl-intel.h
index b8a07d37..a8e958f 100644
--- a/drivers/pinctrl/intel/pinctrl-intel.h
+++ b/drivers/pinctrl/intel/pinctrl-intel.h
@@ -177,13 +177,14 @@ int intel_pinctrl_probe_by_hid(struct platform_device 
*pdev);
 int intel_pinctrl_probe_by_uid(struct platform_device *pdev);
 
 #ifdef CONFIG_PM_SLEEP
-int intel_pinctrl_suspend(struct device *dev);
-int intel_pinctrl_resume(struct device *dev);
+int intel_pinctrl_suspend_noirq(struct device *dev);
+int intel_pinctrl_resume_noirq(struct device *dev);
 #endif
 
-#define INTEL_PINCTRL_PM_OPS(_name)                                            
  \
-const struct dev_pm_ops _name = {                                              
  \
-       SET_LATE_SYSTEM_SLEEP_PM_OPS(intel_pinctrl_suspend, 
intel_pinctrl_resume) \
+#define INTEL_PINCTRL_PM_OPS(_name)                                    \
+const struct dev_pm_ops _name = {                                      \
+       SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(intel_pinctrl_suspend_noirq,      \
+                                     intel_pinctrl_resume_noirq)       \
 }
 
 #endif /* PINCTRL_INTEL_H */
-- 
2.7.4