@@ -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;
@@ -1503,6 +1511,10 @@ int intel_pinctrl_suspend(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;
@@ -1529,6 +1541,32 @@ 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 void
+intel_gpio_update_pad_mode(void __iomem *hostown, u32 mask, u32 value)
+{
+ u32 curr = readl(hostown);
+ u32 updated = (curr & ~mask) | (value & mask);
+
+ if (curr ^ updated) {
+ pr_info("pinctrl-intel: restore HOSTSW_OWN %#08x->%#08x\n",
+ curr, value);
+ return writel(updated, hostown);
+ }
+}
+
int intel_pinctrl_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
@@ -1588,6 +1626,20 @@ int intel_pinctrl_resume(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;
+
+ if (padgrp->gpio_base < 0)
+ continue;
+
+ requested = intel_gpio_is_requested(&pctrl->chip,
+ padgrp->gpio_base, padgrp->size);
+ intel_gpio_update_pad_mode(base + gpp * 4, requested,
+ communities[i].hostown[gpp]);
+ }
}
return 0;
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> --- Note: v2: update hostown and show pr_info only when the host mode change on requsted GPIO is not expected. drivers/pinctrl/intel/pinctrl-intel.c | 54 ++++++++++++++++++++++++++- 1 file changed, 53 insertions(+), 1 deletion(-)