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pinctrl: intel: Retain HOSTSW_OWN for requested gpio pin 

The touchpad of the ASUS laptops E403NA, X540NA, X541NA are not
responsive after suspend/resume. The following error message
shows after resume.
 i2c_hid i2c-ELAN1200:00: failed to reset device.

On these laptops, the touchpad interrupt is connected via a GPIO
pin which is controlled by Intel pinctrl. After system resumes,
the GPIO is in ACPI mode and no longer works as an IRQ.

This commit saves the HOSTSW_OWN value during suspend, make sure
the HOSTSW_OWN mode remains the same after resume.

Signed-off-by: Chris Chiu <chiu@endlessm.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:
Chris Chiu 2019-04-15 13:53:58 +08:00 committed by Andy Shevchenko
parent 2fef327668
commit a0a5f7661e
1 changed files with 55 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
drivers/pinctrl/intel/pinctrl-intel.c
View File

@ -81,6 +81,7 @@ struct intel_pad_context {
struct intel_community_context {
u32 *intmask;
u32 *hostown;
};
struct intel_pinctrl_context {
@ -1284,7 +1285,7 @@ static int intel_pinctrl_pm_init(struct intel_pinctrl *pctrl)
for (i = 0; i < pctrl->ncommunities; i++) {
struct intel_community *community = &pctrl->communities[i];
u32 *intmask;
u32 *intmask, *hostown;
intmask = devm_kcalloc(pctrl->dev, community->ngpps,
sizeof(*intmask), GFP_KERNEL);
@ -1292,6 +1293,13 @@ static int intel_pinctrl_pm_init(struct intel_pinctrl *pctrl)
return -ENOMEM;
communities[i].intmask = intmask;
hostown = devm_kcalloc(pctrl->dev, community->ngpps,
sizeof(*hostown), GFP_KERNEL);
if (!hostown)
return -ENOMEM;
communities[i].hostown = hostown;
}
pctrl->context.pads = pads;
@ -1501,6 +1509,10 @@ int intel_pinctrl_suspend_noirq(struct device *dev)
base = community->regs + community->ie_offset;
for (gpp = 0; gpp < community->ngpps; gpp++)
communities[i].intmask[gpp] = readl(base + gpp * 4);
base = community->regs + community->hostown_offset;
for (gpp = 0; gpp < community->ngpps; gpp++)
communities[i].hostown[gpp] = readl(base + gpp * 4);
}
return 0;
@ -1527,6 +1539,29 @@ static void intel_gpio_irq_init(struct intel_pinctrl *pctrl)
}
}
static u32
intel_gpio_is_requested(struct gpio_chip *chip, int base, unsigned int size)
{
u32 requested = 0;
unsigned int i;
for (i = 0; i < size; i++)
if (gpiochip_is_requested(chip, base + i))
requested |= BIT(i);
return requested;
}
static u32
intel_gpio_update_pad_mode(void __iomem *hostown, u32 mask, u32 value)
{
u32 curr = readl(hostown);
u32 updated = (curr & ~mask) | (value & mask);
writel(updated, hostown);
return curr;
}
int intel_pinctrl_resume_noirq(struct device *dev)
{
struct intel_pinctrl *pctrl = dev_get_drvdata(dev);
@ -1585,6 +1620,25 @@ int intel_pinctrl_resume_noirq(struct device *dev)
dev_dbg(dev, "restored mask %d/%u %#08x\n", i, gpp,
readl(base + gpp * 4));
}
base = community->regs + community->hostown_offset;
for (gpp = 0; gpp < community->ngpps; gpp++) {
const struct intel_padgroup *padgrp = &community->gpps[gpp];
u32 requested = 0, value = 0;
u32 saved = communities[i].hostown[gpp];
if (padgrp->gpio_base < 0)
continue;
requested = intel_gpio_is_requested(&pctrl->chip,
padgrp->gpio_base, padgrp->size);
value = intel_gpio_update_pad_mode(base + gpp * 4,
requested, saved);
if ((value ^ saved) & requested) {
dev_warn(dev, "restore hostown %d/%u %#8x->%#8x\n",
i, gpp, value, saved);
}
}
}
return 0;