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

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Date:   Mon, 19 Aug 2019 18:07:34 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Wei Xu <xuwei5@...ilicon.com>
Cc:     "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        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 v3] gpio: pl061: Fix the issue failed to register the ACPI interrtupion

On Mon, Aug 19, 2019 at 4:29 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:
>
>         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