linux-kernel - Re: [PATCH] nouveau: make backlight support non optional

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Date:   Sat, 24 Jul 2021 08:55:31 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Karol Herbst <kherbst@...hat.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Lyude Paul <lyude@...hat.com>, Ben Skeggs <bskeggs@...hat.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Daniel Vetter <daniel@...ll.ch>,
        ML nouveau <nouveau@...ts.freedesktop.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH] nouveau: make backlight support non optional

On Sat, Jul 24, 2021 at 12:47 AM Karol Herbst <kherbst@...hat.com> wrote:
>
> In the past this only led to compilation issues. Also the small amount of
> extra .text shouldn't really matter compared to the entire nouveau driver
> anyway.
>

>         select DRM_TTM_HELPER
> -       select BACKLIGHT_CLASS_DEVICE if DRM_NOUVEAU_BACKLIGHT
> -       select ACPI_VIDEO if ACPI && X86 && BACKLIGHT_CLASS_DEVICE && INPUT
> +       select BACKLIGHT_CLASS_DEVICE
> +       select ACPI_VIDEO if ACPI && X86 && INPUT
>         select X86_PLATFORM_DEVICES if ACPI && X86
>         select ACPI_WMI if ACPI && X86

I think the logic needs to be the reverse: instead of 'select
BACKLIGHT_CLASS_DEVICE',
this should be 'depends on BACKLIGHT_CLASS_DEVICE', and the same for ACPI_VIDEO.

We may want to add 'default DRM || FB' to BACKLIGHT_CLASS_DEVICE in the
process so we don't lose it for users doing 'make oldconfig' or 'make defconfig'

The rest of the patch looks good to me.

       Arnd