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Date: Wed, 27 Oct 2021 16:41:55 +0300 From: Jani Nikula <jani.nikula@...ux.intel.com> To: Arnd Bergmann <arnd@...nel.org>, dri-devel@...ts.freedesktop.org, Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>, Rodrigo Vivi <rodrigo.vivi@...el.com>, David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch> Cc: linux-fbdev@...r.kernel.org, intel-gfx@...ts.freedesktop.org, Arnd Bergmann <arnd@...db.de>, Matthew Auld <matthew.auld@...el.com>, Zhenyu Wang <zhenyuw@...ux.intel.com>, Alex Williamson <alex.williamson@...hat.com>, Jason Gunthorpe <jgg@...pe.ca>, Daniele Ceraolo Spurio <daniele.ceraolospurio@...el.com>, linux-kernel@...r.kernel.org Subject: Re: [PATCH 3/3] [v2] i915: fix backlight configuration issue On Wed, 27 Oct 2021, Arnd Bergmann <arnd@...nel.org> wrote: > From: Arnd Bergmann <arnd@...db.de> > > The i915 driver can use the backlight subsystem as an option, and usually > selects it when CONFIG_ACPI is set. However it is possible to configure > a kernel with modular backlight classdev support and a built-in i915 > driver, which leads to a linker error: > > drivers/gpu/drm/i915/display/intel_panel.o: In function `intel_backlight_device_register': > intel_panel.c:(.text+0x2f58): undefined reference to `backlight_device_register' > drivers/gpu/drm/i915/display/intel_panel.o: In function `intel_backlight_device_unregister': > intel_panel.c:(.text+0x2fe4): undefined reference to `backlight_device_unregister' > > Change i915 to just 'depends on' for both BACKLIGHT_CLASS_DEVICE > and ACPI_VIDEO, which avoids a lot of the problems. > > Link: https://lore.kernel.org/all/20200108140227.3976563-1-arnd@arndb.de/ > Link: https://lore.kernel.org/all/20200417155553.675905-1-arnd@arndb.de/ > Signed-off-by: Arnd Bergmann <arnd@...db.de> > --- > This change depends on cleaning up drivers/video/fbdev to no longer > 'select' I2C and BACKLIGHT_CLASS_DEVICE, otherwise it causes > dependency loops. > --- > drivers/gpu/drm/i915/Kconfig | 6 ++---- > 1 file changed, 2 insertions(+), 4 deletions(-) > > diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig > index 84b6fc70cbf5..f427e6d50d9b 100644 > --- a/drivers/gpu/drm/i915/Kconfig > +++ b/drivers/gpu/drm/i915/Kconfig > @@ -3,6 +3,8 @@ config DRM_I915 > tristate "Intel 8xx/9xx/G3x/G4x/HD Graphics" > depends on DRM > depends on X86 && PCI > + depends on ACPI_VIDEO || !ACPI > + depends on BACKLIGHT_CLASS_DEVICE || !BACKLIGHT_CLASS_DEVICE > select INTEL_GTT > select INTERVAL_TREE > # we need shmfs for the swappable backing store, and in particular > @@ -16,10 +18,6 @@ config DRM_I915 > select IRQ_WORK > # i915 depends on ACPI_VIDEO when ACPI is enabled > # but for select to work, need to select ACPI_VIDEO's dependencies, ick The comment needs updating as well. Other than that, Acked-by: Jani Nikula <jani.nikula@...el.com> on the series. > - select BACKLIGHT_CLASS_DEVICE if ACPI > - select INPUT if ACPI > - select ACPI_VIDEO if ACPI > - select ACPI_BUTTON if ACPI > select SYNC_FILE > select IOSF_MBI > select CRC32 -- Jani Nikula, Intel Open Source Graphics Center
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