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pinctrl: cherryview: Serialize register access in suspend/resume

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commit 56211121c0825cd188caad05574fdc518d5cac6f upstream.

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.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mika Westerberg 2016-10-31 16:57:32 +02:00 • committed by Greg Kroah-Hartman
parent c45bfaa921
commit 126d0a2fe8
1 changed files with 10 additions and 0 deletions
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10
drivers/pinctrl/intel/pinctrl-cherryview.c
View file

@ -1568,8 +1568,11 @@ 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++) {
@ -1590,6 +1593,8 @@ static int chv_pinctrl_suspend(struct device *dev)
ctx->padctrl1 = readl(reg);
}
raw_spin_unlock_irqrestore(&chv_lock, flags);
return 0;
}
@ -1597,8 +1602,11 @@ 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
@ -1643,6 +1651,8 @@ 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