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pinctrl: cherryview: Serialize register access in suspend/resume

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If async suspend is enabled, the driver may access registers concurrently
with another instance which may fail because of the bug in Cherryview GPIO
hardware. Prevent this by taking the shared lock while accessing the
hardware in suspend and resume hooks.

Cc: stable@vger.kernel.org
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 16:57:32 +02:00 • committed by Linus Walleij
parent 9999fe5df5
commit 56211121c0
1 changed files with 10 additions and 0 deletions
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10
drivers/pinctrl/intel/pinctrl-cherryview.c
View file

@ -1656,8 +1656,11 @@ static int chv_pinctrl_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct chv_pinctrl *pctrl = platform_get_drvdata(pdev);
unsigned long flags;
int i;
raw_spin_lock_irqsave(&chv_lock, flags);
pctrl->saved_intmask = readl(pctrl->regs + CHV_INTMASK);
for (i = 0; i < pctrl->community->npins; i++) {
@ -1678,6 +1681,8 @@ static int chv_pinctrl_suspend(struct device *dev)
ctx->padctrl1 = readl(reg);
}
raw_spin_unlock_irqrestore(&chv_lock, flags);
return 0;
}
@ -1685,8 +1690,11 @@ static int chv_pinctrl_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct chv_pinctrl *pctrl = platform_get_drvdata(pdev);
unsigned long flags;
int i;
raw_spin_lock_irqsave(&chv_lock, flags);
/*
* Mask all interrupts before restoring per-pin configuration
* registers because we don't know in which state BIOS left them
@ -1731,6 +1739,8 @@ static int chv_pinctrl_resume(struct device *dev)
chv_writel(0xffff, pctrl->regs + CHV_INTSTAT);
chv_writel(pctrl->saved_intmask, pctrl->regs + CHV_INTMASK);
raw_spin_unlock_irqrestore(&chv_lock, flags);
return 0;
}
#endif