linux-kernel - Re: [PATCH] ACPI: GED: add support for _Exx /

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Date:   Fri, 15 May 2020 18:32:14 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Stable <stable@...r.kernel.org>
Subject: Re: [PATCH] ACPI: GED: add support for _Exx / _Lxx handler methods

On Fri, May 15, 2020 at 11:37 AM Ard Biesheuvel <ardb@...nel.org> wrote:
>
> Per the ACPI spec, interrupts in the range [0, 255] may be handled
> in AML using individual methods whose naming is based on the format
> _Exx or _Lxx, where xx is the hex representation of the interrupt
> index.
>
> Add support for this missing feature to our ACPI GED driver.
>
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Cc: Len Brown <lenb@...nel.org>
> Cc: linux-acpi@...r.kernel.org
> Cc: <stable@...r.kernel.org> # v4.9+
> Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
> ---
>  drivers/acpi/evged.c | 22 +++++++++++++++++---
>  1 file changed, 19 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/acpi/evged.c b/drivers/acpi/evged.c
> index aba0d0027586..6d7a522952bf 100644
> --- a/drivers/acpi/evged.c
> +++ b/drivers/acpi/evged.c
> @@ -79,6 +79,8 @@ static acpi_status acpi_ged_request_interrupt(struct acpi_resource *ares,
>         struct resource r;
>         struct acpi_resource_irq *p = &ares->data.irq;
>         struct acpi_resource_extended_irq *pext = &ares->data.extended_irq;
> +       char ev_name[5];
> +       u8 trigger;
>
>         if (ares->type == ACPI_RESOURCE_TYPE_END_TAG)
>                 return AE_OK;
> @@ -87,14 +89,28 @@ static acpi_status acpi_ged_request_interrupt(struct acpi_resource *ares,
>                 dev_err(dev, "unable to parse IRQ resource\n");
>                 return AE_ERROR;
>         }
> -       if (ares->type == ACPI_RESOURCE_TYPE_IRQ)
> +       if (ares->type == ACPI_RESOURCE_TYPE_IRQ) {
>                 gsi = p->interrupts[0];
> -       else
> +               trigger = p->triggering;
> +       } else {
>                 gsi = pext->interrupts[0];
> +               trigger = p->triggering;
> +       }
>
>         irq = r.start;
>
> -       if (ACPI_FAILURE(acpi_get_handle(handle, "_EVT", &evt_handle))) {
> +       switch (gsi) {
> +       case 0 ... 255:
> +               sprintf(ev_name, "_%c%02hhX",
> +                       trigger == ACPI_EDGE_SENSITIVE ? 'E' : 'L', gsi);
> +
> +               if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))
> +                       break;
> +               /* fall through */
> +       default:
> +               if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle)))
> +                       break;
> +
>                 dev_err(dev, "cannot locate _EVT method\n");
>                 return AE_ERROR;
>         }
> --

Applied as 5.8 material, thanks!