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

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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 initialize 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.wu@intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Binbin Wu 2019-04-08 18:49:26 +08:00 committed by Andy Shevchenko
parent 10d64c871c
commit 2fef327668
2 changed files with 10 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/pinctrl/intel/pinctrl-intel.c
View File

@ -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.nyman@linux.intel.com>");

11
drivers/pinctrl/intel/pinctrl-intel.h
View File

@ -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 */