linux-kernel - Re: [PATCH] ACPI: video: Add acpi_backlight=vendor quirk for Toshiba Portégé R100

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Message-ID: <CAJZ5v0gqywy7o69fD4F4Snjb5Oh1Z44GD=C_WfkiSyW7NrxsGw@mail.gmail.com>
Date:   Tue, 3 Oct 2023 20:36:07 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Ondrej Zary <linux@...y.sk>
Cc:     "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPI: video: Add acpi_backlight=vendor quirk for Toshiba Portégé R100

On Fri, Sep 29, 2023 at 10:21 PM Ondrej Zary <linux@...y.sk> wrote:
>
> Toshiba Portégé R100 has both acpi_video and toshiba_acpi vendor
> backlight driver working. But none of them gets activated as it has
> a VGA with no kernel driver (Trident CyberBlade XP4m32).
>
> The DMI strings are very generic ("Portable PC") so add a custom
> callback function to check for Trident CyberBlade XP4m32 PCI device
> before enabling the vendor backlight driver (better than acpi_video
> as it has more brightness steps).
>
> Fixes: 5aa9d943e9b6 ("ACPI: video: Don't enable fallback path for creating ACPI backlight by default")
> Signed-off-by: Ondrej Zary <linux@...y.sk>
> ---
>  drivers/acpi/video_detect.c | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
>
> diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
> index 442396f6ed1f..31205fee59d4 100644
> --- a/drivers/acpi/video_detect.c
> +++ b/drivers/acpi/video_detect.c
> @@ -130,6 +130,16 @@ static int video_detect_force_native(const struct dmi_system_id *d)
>         return 0;
>  }
>
> +static int video_detect_portege_r100(const struct dmi_system_id *d)
> +{
> +       struct pci_dev *dev;
> +       /* Search for Trident CyberBlade XP4m32 to confirm Portégé R100 */
> +       dev = pci_get_device(PCI_VENDOR_ID_TRIDENT, 0x2100, NULL);
> +       if (dev)
> +               acpi_backlight_dmi = acpi_backlight_vendor;
> +       return 0;
> +}
> +
>  static const struct dmi_system_id video_detect_dmi_table[] = {
>         /*
>          * Models which should use the vendor backlight interface,
> @@ -270,6 +280,22 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
>                 },
>         },
>
> +       /*
> +        * Toshiba Portégé R100 has working both acpi_video and toshiba_acpi
> +        * vendor driver. But none of them gets activated as it has a VGA with
> +        * no kernel driver (Trident CyberBlade XP4m32).
> +        * The DMI strings are generic so check for the VGA chip in callback.
> +        */
> +       {
> +        .callback = video_detect_portege_r100,
> +        .matches = {
> +               DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
> +               DMI_MATCH(DMI_PRODUCT_NAME, "Portable PC"),
> +               DMI_MATCH(DMI_PRODUCT_VERSION, "Version 1.0"),
> +               DMI_MATCH(DMI_BOARD_NAME, "Portable PC")
> +               },
> +       },
> +
>         /*
>          * Models which need acpi_video backlight control where the GPU drivers
>          * do not call acpi_video_register_backlight() because no internal panel
> --

Applied as 6.7 material, thanks!