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pinctrl: cherryview: Prevent possible interrupt storm on resume 

When the system is suspended to S3 the BIOS might re-initialize certain
GPIO pins back to their original state or it may re-program interrupt mask
of others. For example Acer TravelMate B116-M had BIOS bug where certain
GPIO pin (MF_ISH_GPIO_5) was programmed to trigger on high level, and the
pin state was high once the BIOS gave control to the OS on resume.

This triggers lots of messages like:

 irq 117, desc: ffff88017a61e600, depth: 1, count: 0, unhandled: 0
 ->handle_irq():  ffffffff8109b613, handle_bad_irq+0x0/0x1e0
 ->irq_data.chip(): ffffffffa0020180, chv_pinctrl_exit+0x2d84/0x12 [pinctrl_cherryview]
 ->action():           (null)
    IRQ_NOPROBE set

We reset the mask back to known state in chv_pinctrl_resume() but that is
called only after device interrupts have already been enabled.

Now, this particular issue was fixed by upgrading the BIOS to the latest
(v1.23) but not everybody upgrades their BIOSes so we fix it up in the
driver as well.

Prevent the possible interrupt storm by moving suspend and resume hooks to
be called at _noirq time instead. Since device interrupts are still
disabled we can restore the mask back to known state before interrupt storm
happens.

Cc: stable@vger.kernel.org
Reported-by: Christian Steiner <christian.steiner@outlook.de>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Mika Westerberg 2016-10-31 16:57:33 +02:00 committed by Linus Walleij
parent 56211121c0
commit d2cdf5dc58
1 changed files with 4 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/pinctrl/intel/pinctrl-cherryview.c
View File

@ -1652,7 +1652,7 @@ static int chv_pinctrl_probe(struct platform_device *pdev)
}
#ifdef CONFIG_PM_SLEEP
static int chv_pinctrl_suspend(struct device *dev)
static int chv_pinctrl_suspend_noirq(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct chv_pinctrl *pctrl = platform_get_drvdata(pdev);
@ -1686,7 +1686,7 @@ static int chv_pinctrl_suspend(struct device *dev)
return 0;
}
static int chv_pinctrl_resume(struct device *dev)
static int chv_pinctrl_resume_noirq(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct chv_pinctrl *pctrl = platform_get_drvdata(pdev);
@ -1746,7 +1746,8 @@ static int chv_pinctrl_resume(struct device *dev)
#endif
static const struct dev_pm_ops chv_pinctrl_pm_ops = {
SET_LATE_SYSTEM_SLEEP_PM_OPS(chv_pinctrl_suspend, chv_pinctrl_resume)
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(chv_pinctrl_suspend_noirq,
chv_pinctrl_resume_noirq)
};
static const struct acpi_device_id chv_pinctrl_acpi_match[] = {