irqchip: qcom: pdc: Introduce irq_set_wake call

This series adds support to lazy disable pdc interrupt.

Some drivers using gpio interrupts want to configure gpio for wakeup using enable_irq_wake() but during suspend entry disables irq and expects system to resume when interrupt occurs. In the driver resume call interrupt is re-enabled and removes wakeup capability using disable_irq_wake() one such example is cros ec driver.

With [1] in documentation saying "An irq can be disabled with disable_irq() and still wake the system as long as the irq has wake enabled".

The PDC IRQs are currently "unlazy disabled" (disable here means that it will be masked in PDC & GIC HW GICD_ISENABLER, the moment driver invokes disable_irq()) such IRQs can not wakeup from low power modes like suspend to RAM since the driver chosen to disable this.

During suspend entry, no one re-enable/unmask in HW, even if its marked for wakeup.

One solutions thought to address this problem was...During suspend entry at last point, irq chip driver re-enable/unmask IRQs in HW that are marked for wakeup. This was attemped in [2].

This series adds alternate solution to [2] by "lazy disable" IRQs in HW. The genirq takes care of lazy disable in case if irqchip did not implement irq_disable callback. Below is high level steps on how this works out..

a. During driver's disable_irq() call, IRQ will be marked disabled in SW b. IRQ will still be enabled(read unmasked in HW)
c. The device then enters low power mode like suspend to RAM d. The HW detects unmasked IRQs and wakesup the CPU
e. During resume after local_irq_enable() CPU goes to handle the wake IRQ f. Generic handler comes to know that IRQ is disabled in SW
g. Generic handler marks IRQ as pending and now invokes mask callback h. IRQ gets disabled/masked in HW now
i. When driver invokes enable_irq() the SW pending IRQ leads IRQ's handler j. enable_irq() will again enable/unmask in HW

[1] https://www.spinics.net/lists/kernel/msg3398294.html
[2] https://patchwork.kernel.org/patch/11466021/

Maulik Shah (4):
gpio: gpiolib: Allow GPIO IRQs to lazy disable
pinctrl: qcom: Remove irq_disable callback from msmgpio irqchip
pinctrl: qcom: Add msmgpio irqchip flags
irqchip: qcom-pdc: Introduce irq_set_wake call

 drivers/gpio/gpiolib.c             | 59 ++++++++++++++++++++++++--------------
 drivers/irqchip/qcom-pdc.c         | 33 ++++++++++-----------
 drivers/pinctrl/qcom/pinctrl-msm.c | 15 ++--------
 include/linux/gpio/driver.h        | 13 +++++++++
 4 files changed, 70 insertions(+), 50 deletions(-)

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