On 12/28/18 7:15 AM, Bartlomiej Zolnierkiewicz wrote:
> Making FB_BACKLIGHT tristate by commit b4a1ed0cd18b ("fbdev:
> make FB_BACKLIGHT a tristate") caused unmet dependencies in
> some configurations:
>
> WARNING: unmet direct dependencies detected for FB_BACKLIGHT
> Depends on [m]: HAS_IOMEM [=y] && FB [=m]
> Selected by [y]:
> - DRM_NOUVEAU [=y] && HAS_IOMEM [=y] && DRM [=y] && PCI [=y] && MMU [=y] &&
> DRM_NOUVEAU_BACKLIGHT [=y]
> Selected by [m]:
> - FB_NVIDIA [=m] && HAS_IOMEM [=y] && FB [=m] && PCI [=y] &&
> FB_NVIDIA_BACKLIGHT [=y]
>
> Fix it by making DRM_NOUVEAU select BACKLIGHT_CLASS_DEVICE and
> BACKLIGHT_LCD_SUPPORT instead of FB_BACKLIGHT.
>
> Fixes: b4a1ed0cd18b ("fbdev: make FB_BACKLIGHT a tristate")
> Reported-by: Randy Dunlap <rdun...@infradead.org>
> Cc: Rob Clark <robdcl...@gmail.com>
> Cc: Arnd Bergmann <a...@arndb.de>
> Cc: Ben Skeggs <bske...@redhat.com>
> Cc: David Airlie <airl...@linux.ie>
> Cc: Daniel Vetter <dan...@ffwll.ch>
> Cc: Stephen Rothwell <s...@canb.auug.org.au>
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnier...@samsung.com>
Works for me. Thanks.
Acked-by: Randy Dunlap <rdun...@infradead.org> # build-tested
> ---
> I would like to merge this patch through fbdev tree for v4.21
> (as it is needed to fix commit currently in fbdev tree).
>
> drivers/gpu/drm/nouveau/Kconfig | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> Index: b/drivers/gpu/drm/nouveau/Kconfig
> ===================================================================
> --- a/drivers/gpu/drm/nouveau/Kconfig 2018-11-30 11:46:55.716464505 +0100
> +++ b/drivers/gpu/drm/nouveau/Kconfig 2018-12-28 14:54:51.655965845 +0100
> @@ -4,7 +4,8 @@ config DRM_NOUVEAU
> select FW_LOADER
> select DRM_KMS_HELPER
> select DRM_TTM
> - select FB_BACKLIGHT if DRM_NOUVEAU_BACKLIGHT
> + select BACKLIGHT_CLASS_DEVICE if DRM_NOUVEAU_BACKLIGHT
> + select BACKLIGHT_LCD_SUPPORT if DRM_NOUVEAU_BACKLIGHT
> select ACPI_VIDEO if ACPI && X86 && BACKLIGHT_CLASS_DEVICE && INPUT
> select X86_PLATFORM_DEVICES if ACPI && X86
> select ACPI_WMI if ACPI && X86
>
--
~Randy
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