linux-kernel - Re: [PATCH v3] drm/gma500: depend on framebuffer

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Message-ID: <CAMeQTsaM363n5F=--xhSTayFqOMNvjTQjqz_aEhby6i-KRVBKQ@mail.gmail.com>
Date:   Sun, 10 Apr 2022 21:52:33 +0200
From:   Patrik Jakobsson <patrik.r.jakobsson@...il.com>
To:     James Hilliard <james.hilliard1@...il.com>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] drm/gma500: depend on framebuffer

On Sun, Apr 10, 2022 at 9:40 PM James Hilliard
<james.hilliard1@...il.com> wrote:
>
> On Sun, Apr 10, 2022 at 1:36 PM Patrik Jakobsson
> <patrik.r.jakobsson@...il.com> wrote:
> >
> > On Sat, Apr 9, 2022 at 6:23 AM James Hilliard <james.hilliard1@...il.com> wrote:
> > >
> > > Select the efi framebuffer if efi is enabled.
> > >
> > > This appears to be needed for video output to function correctly.
> > >
> > > Signed-off-by: James Hilliard <james.hilliard1@...il.com>
> >
> > Hi James,
> > EFI_FB is its own driver and not needed by gma500 to drive its
> > hardware. What makes you think it's required?
>
> I wasn't getting any HDMI video output without it enabled for some reason,
> I assume it is doing some sort of initialization needed by gma500
> during startup.

Then it sounds like you might just be using EFI_FB and not gma500. Can
you provide the kernel log with drm.debug=0x1f set on kernel
command-line.

What machine is this? I've seen very few gma500 devices with UEFI.

>
> >
> > -Patrik
> >
> > > ---
> > > Changes v2 -> v3:
> > >   - select EFI_FB instead of depending on it
> > > Changes v1 -> v2:
> > >   - use depends instead of select
> > > ---
> > >  drivers/gpu/drm/gma500/Kconfig | 2 ++
> > >  1 file changed, 2 insertions(+)
> > >
> > > diff --git a/drivers/gpu/drm/gma500/Kconfig b/drivers/gpu/drm/gma500/Kconfig
> > > index 0cff20265f97..a422fa84d53b 100644
> > > --- a/drivers/gpu/drm/gma500/Kconfig
> > > +++ b/drivers/gpu/drm/gma500/Kconfig
> > > @@ -2,11 +2,13 @@
> > >  config DRM_GMA500
> > >         tristate "Intel GMA500/600/3600/3650 KMS Framebuffer"
> > >         depends on DRM && PCI && X86 && MMU
> > > +       depends on FB
> > >         select DRM_KMS_HELPER
> > >         # GMA500 depends on ACPI_VIDEO when ACPI is enabled, just like i915
> > >         select ACPI_VIDEO if ACPI
> > >         select BACKLIGHT_CLASS_DEVICE if ACPI
> > >         select INPUT if ACPI
> > > +       select FB_EFI if EFI
> > >         help
> > >           Say yes for an experimental 2D KMS framebuffer driver for the
> > >           Intel GMA500 (Poulsbo), Intel GMA600 (Moorestown/Oak Trail) and
> > > --
> > > 2.25.1
> > >