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authorRushikesh S Kadam <rushikesh.s.kadam@intel.com>2017-08-11 11:23:44 +0300
committerLinus Walleij <linus.walleij@linaro.org>2017-08-22 15:46:15 +0300
commit5ff56b015e85c4a6761968db369b4b2c9d821c86 (patch)
tree0f38ad7910047d90d0fac4de0ad001a6bbcffeaa /drivers/pinctrl/intel
parenta228d74f3354b8abdade461209b9aec0dac7cd76 (diff)
downloadlinux-5ff56b015e85c4a6761968db369b4b2c9d821c86.tar.xz
pinctrl: intel: Disable GPIO pin interrupts in suspend
The fix prevents unintended wakes from second level GPIO pin interrupts. On some Intel Kabylake platforms, it is observed that GPIO pin interrupts can wake the platform from suspend-to-idle, even though the IRQ is not configured as IRQF_NO_SUSPEND or enable_irq_wake(). This can cause undesired wakes on Mobile devices such as Laptops and Chromebook devices. For example a headset jack insertion is not a desired wake source on Chromebook devices. The pinctrl-intel (GPIO controller) driver implements a "Shared IRQ" model. All GPIO pin interrupts are OR'ed and mapped to a first level IRQ14 (or IRQ15). The driver registers an irq_chip struct and maps an irq_domain for the GPIO pin interrupts. The IRQ14 handler demuxes and calls the second level IRQ for the respective pin. In the suspend entry flow, at suspend_noirq stage, the kernel disables IRQs that are not marked for wake. The pinctrl-intel driver does not implement a irq_disable() callback (to take advantage of lazy disabling). The pinctrl-intel GPIO interrupts are not disabled in hardware during suspend entry, and thus are able to wake the SoC out of suspend-to-idle. This patch sets the IRQCHIP_MASK_ON_SUSPEND flag for the GPIO irq_chip, to disable the second level interrupts at suspend_noirq stage via the irq_mask callbacks. The irq_mask callback disables the IRQs in hardware by programming the corresponding GPIO pad registers. Only IRQs that are not marked for wake are disabled. Signed-off-by: Rushikesh S Kadam <rushikesh.s.kadam@intel.com> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Reviewed-and-tested-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl/intel')
-rw-r--r--drivers/pinctrl/intel/pinctrl-intel.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c
index 6dc1096d3d34..8f8721538616 100644
--- a/drivers/pinctrl/intel/pinctrl-intel.c
+++ b/drivers/pinctrl/intel/pinctrl-intel.c
@@ -1035,6 +1035,7 @@ static struct irq_chip intel_gpio_irqchip = {
.irq_unmask = intel_gpio_irq_unmask,
.irq_set_type = intel_gpio_irq_type,
.irq_set_wake = intel_gpio_irq_wake,
+ .flags = IRQCHIP_MASK_ON_SUSPEND,
};
static int intel_gpio_probe(struct intel_pinctrl *pctrl, int irq)