Re: [PATCH v3] gpio: pl061: Fix the issue failed to register the ACPI interrtupion

From: Andy Shevchenko
Date: Mon Aug 19 2019 - 11:07:49 EST

On Mon, Aug 19, 2019 at 4:29 PM Wei Xu <xuwei5@xxxxxxxxxxxxx> wrote:
> Invoke acpi_gpiochip_request_interrupts after the acpi data has been
> attached to the pl061 acpi node to register interruption.
> Otherwise it will be failed to register interruption for the ACPI case.
> Because in the gpiochip_add_data_with_key, acpi_gpiochip_add is invoked
> after gpiochip_add_irqchip but at that time the acpi data has not been
> attached yet.
> Tested with below steps:
> qemu-system-aarch64 \
> -machine virt,gic-version=3 -cpu cortex-a57 \
> -m 1G,maxmem=4G,slots=4 \
> -kernel Image -initrd rootfs.cpio.gz \
> -net none -nographic \
> -bios QEMU_EFI.fd \
> -append "console=ttyAMA0 acpi=force earlycon=pl011,0x9000000"
> The pl061 interruption is missed and the following output is not in the
> /proc/interrupts on the v5.3-rc4 compared with the v5.2.0-rc7.
> 43: 0 ARMH0061:00 3 Edge ACPI:Event

The proper fix is to revert the culprit since we call
acpi_gpiochip_request_interrupts() for all controllers.
Linus, please re-do the approach with IRQ handling, it seems broadly
regress with ACPI enabled platforms.

With Best Regards,
Andy Shevchenko