linux-kernel - Re: [PATCH] gpio: pl061: Fix the issue failed to register the ACPI interruption

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Message-ID: <CAHp75VcKNZeq80hw5qjKKuh8Qg=WUrXPSpcy6yx5h-_7RHah+g@mail.gmail.com>
Date:   Thu, 15 Aug 2019 16:10:24 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Wei Xu <xuwei5@...ilicon.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Linuxarm <linuxarm@...wei.com>,
        Shameerali Kolothum Thodi 
        <shameerali.kolothum.thodi@...wei.com>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        John Garry <john.garry@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        Shiju Jose <shiju.jose@...wei.com>, jinying@...ilicon.com,
        Zhangyi ac <zhangyi.ac@...wei.com>,
        "Liguozhu (Kenneth)" <liguozhu@...ilicon.com>,
        Tangkunshan <tangkunshan@...wei.com>,
        huangdaode <huangdaode@...ilicon.com>
Subject: Re: [PATCH] gpio: pl061: Fix the issue failed to register the ACPI interruption

On Mon, Aug 12, 2019 at 2:30 PM Wei Xu <xuwei5@...ilicon.com> 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 on QEMU v4.1.0-rc3 and Linux kernel v5.3-rc4,
> and found pl061 interruption is missed in the /proc/interrupts:
> 1.
> 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"
>
> 2. cat /proc/interrupts in the guest console:
> estuary:/$ cat /proc/interrupts
> CPU0
> 2:       3228     GICv3  27 Level     arch_timer
> 4:         15     GICv3  33 Level     uart-pl011
> 42:          0     GICv3  23 Level     arm-pmu
> IPI0:         0       Rescheduling interrupts
> IPI1:         0       Function call interrupts
> IPI2:         0       CPU stop interrupts
> IPI3:         0       CPU stop (for crash dump) interrupts
> IPI4:         0       Timer broadcast interrupts
> IPI5:         0       IRQ work interrupts
> IPI6:         0       CPU wake-up interrupts
> Err:          0
>
> Fixes: 04ce935c6b2a ("gpio: pl061: Pass irqchip when adding gpiochip")

Linus, I'm wondering if we can do this for all inside the GPIO library.
Thoughts?

--
With Best Regards,
Andy Shevchenko