On Wed, 01 Oct 2014, Randy Dunlap <rdunlap@xxxxxxxxxxxxx> wrote:
> On 10/01/14 10:57, Jani Nikula wrote:
>> On Wed, 01 Oct 2014, Jim Davis <jim.epost@xxxxxxxxx> wrote:
>>> Building with the attached random configuration file,
>>>
>>> warning: (VIDEO_TIMBERDALE) selects TIMB_DMA which has unmet direct
>>> dependencies (DMADEVICES && MFD_TIMBERDALE)
>>> warning: (USB_OTG_FSM && FSL_USB2_OTG && USB_MV_OTG) selects USB_OTG
>>> which has unmet direct dependencies (USB_SUPPORT && USB && PM_RUNTIME)
>>>
>>> drivers/built-in.o: In function `intel_panel_setup_backlight':
>>> (.text+0x11855d): undefined reference to `backlight_device_register'
>>> drivers/built-in.o: In function `intel_panel_destroy_backlight':
>>> (.text+0x118624): undefined reference to `backlight_device_unregister'
>>> make: *** [vmlinux] Error 1
>>
>> It's the combination:
>>
>>> CONFIG_DRM_I915=y
>>> CONFIG_BACKLIGHT_CLASS_DEVICE=m
>>
>> Not sure what the Kconfig magic spell needs to be when we don't want to
>> depend on CONFIG_BACKLIGHT_CLASS_DEVICE but we'll use it if it's enabled
>> (y or m).
>
> Something like:
>
> depends on BACKLIGHT_CLASS_DEVICE || BACKLIGHT_CLASS_DEVICE=n
>
> is what we usually use.
Oh boy this gets ugly. Trying
diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
index 4e39ab34eb1c..daa453c62aa6 100644
--- a/drivers/gpu/drm/i915/Kconfig
+++ b/drivers/gpu/drm/i915/Kconfig
@@ -3,6 +3,7 @@ config DRM_I915
depends on DRM
depends on X86 && PCI
depends on (AGP || AGP=n)
+ depends on (BACKLIGHT_CLASS_DEVICE || BACKLIGHT_CLASS_DEVICE=n)
select INTEL_GTT
select AGP_INTEL if AGP
select INTERVAL_TREE
leads to
scripts/kconfig/conf --olddefconfig Kconfig
drivers/gpu/drm/i915/Kconfig:1:error: recursive dependency detected!
drivers/gpu/drm/i915/Kconfig:1: symbol DRM_I915 depends on BACKLIGHT_CLASS_DEVICE
drivers/video/backlight/Kconfig:156: symbol BACKLIGHT_CLASS_DEVICE is selected by DRM_I915
because we depend on ACPI_VIDEO when ACPI is enabled, originally done in
commit ecb4aed78dcf09e48c8c34c8c2fa7f5c69344be6
Author: Len Brown <len.brown@xxxxxxxxx>
Date: Fri Apr 24 11:33:47 2009 -0400
ACPI, i915: build fix
Now, trying to fix that with what seems to me like the obvious
dependency, conveying what we really want
diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
index 4e39ab34eb1c..f5a1ee37603e 100644
--- a/drivers/gpu/drm/i915/Kconfig
+++ b/drivers/gpu/drm/i915/Kconfig
@@ -3,6 +3,7 @@ config DRM_I915
depends on DRM
depends on X86 && PCI
depends on (AGP || AGP=n)
+ depends on ((ACPI && ACPI_VIDEO) || ACPI=n)
select INTEL_GTT
select AGP_INTEL if AGP
select INTERVAL_TREE
@@ -11,13 +12,6 @@ config DRM_I915
select SHMEM
select TMPFS
select DRM_KMS_HELPER
- # i915 depends on ACPI_VIDEO when ACPI is enabled
- # but for select to work, need to select ACPI_VIDEO's dependencies, ick
- select BACKLIGHT_LCD_SUPPORT if ACPI
- select BACKLIGHT_CLASS_DEVICE if ACPI
- select INPUT if ACPI
- select ACPI_VIDEO if ACPI
- select ACPI_BUTTON if ACPI
help
Choose this option if you have a system that has "Intel Graphics
Media Accelerator" or "HD Graphics" integrated graphics,
leads to more fun
scripts/kconfig/conf --olddefconfig Kconfig
drivers/video/fbdev/Kconfig:5:error: recursive dependency detected!
drivers/video/fbdev/Kconfig:5: symbol FB is selected by DRM_KMS_FB_HELPER
drivers/gpu/drm/Kconfig:34: symbol DRM_KMS_FB_HELPER is selected by DRM_I915_FBDEV
drivers/gpu/drm/i915/Kconfig:40: symbol DRM_I915_FBDEV depends on DRM_I915
drivers/gpu/drm/i915/Kconfig:1: symbol DRM_I915 depends on ACPI_VIDEO
drivers/acpi/Kconfig:130: symbol ACPI_VIDEO is selected by BACKLIGHT_CLASS_DEVICE
drivers/video/backlight/Kconfig:156: symbol BACKLIGHT_CLASS_DEVICE is selected by FB_BACKLIGHT
drivers/video/fbdev/Kconfig:188: symbol FB_BACKLIGHT is selected by PMAC_BACKLIGHT
drivers/macintosh/Kconfig:135: symbol PMAC_BACKLIGHT depends on FB
and the rabbit hole gets deeper than I thought. I guess it always does.
At this point the question is whether "depends on ((ACPI && ACPI_VIDEO)
|| ACPI=n)" is worth pursuing and makes more sense than the "select foo
if ACPI" lines, or do we need to build hacks upon hacks to get this
fixed.
BR,
Jani.
--
Jani Nikula, Intel Open Source Technology Center
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