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>
---
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
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