| Message ID | 20241216074450.8590-2-tzimmermann@suse.de (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | drm,fbdev: Fix module dependencies | expand |
On 12/16/24 08:42, Thomas Zimmermann wrote: > Do not select BACKLIGHT_CLASS_DEVICE from FB_BACKLIGHT. The latter > only controls backlight support within fbdev core code and data > structures. > > Make fbdev drivers depend on BACKLIGHT_CLASS_DEVICE and let users > select it explicitly. Fixes warnings about recursive dependencies, > such as > > error: recursive dependency detected! > symbol BACKLIGHT_CLASS_DEVICE is selected by FB_BACKLIGHT > symbol FB_BACKLIGHT is selected by FB_SH_MOBILE_LCDC > symbol FB_SH_MOBILE_LCDC depends on FB_DEVICE > symbol FB_DEVICE depends on FB_CORE > symbol FB_CORE is selected by DRM_GEM_DMA_HELPER > symbol DRM_GEM_DMA_HELPER is selected by DRM_PANEL_ILITEK_ILI9341 > symbol DRM_PANEL_ILITEK_ILI9341 depends on BACKLIGHT_CLASS_DEVICE > > BACKLIGHT_CLASS_DEVICE is user-selectable, so making drivers adapt to > it is the correct approach in any case. For most drivers, backlight > support is also configurable separately. > > v3: > - Select BACKLIGHT_CLASS_DEVICE in PowerMac defconfigs (Christophe) > - Fix PMAC_BACKLIGHT module dependency corner cases (Christophe) > v2: > - s/BACKLIGHT_DEVICE_CLASS/BACKLIGHT_CLASS_DEVICE (Helge) > - Fix fbdev driver-dependency corner case (Arnd) > > Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> > --- > arch/powerpc/configs/pmac32_defconfig | 1 + > arch/powerpc/configs/ppc6xx_defconfig | 1 + > drivers/auxdisplay/Kconfig | 2 +- > drivers/macintosh/Kconfig | 1 + > drivers/staging/fbtft/Kconfig | 1 + > drivers/video/fbdev/Kconfig | 18 +++++++++++++----- > drivers/video/fbdev/core/Kconfig | 3 +-- > 7 files changed, 19 insertions(+), 8 deletions(-) > > ... > diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig > index de035071fedb..55c6686f091e 100644 > --- a/drivers/video/fbdev/Kconfig > +++ b/drivers/video/fbdev/Kconfig > @@ -649,6 +649,7 @@ config FB_S1D13XXX > config FB_ATMEL > tristate "AT91 LCD Controller support" > depends on FB && OF && HAVE_CLK && HAS_IOMEM > + depends on BACKLIGHT_CLASS_DEVICE > depends on HAVE_FB_ATMEL || COMPILE_TEST > select FB_BACKLIGHT > select FB_IOMEM_HELPERS > @@ -660,7 +661,6 @@ config FB_ATMEL > config FB_NVIDIA > tristate "nVidia Framebuffer Support" > depends on FB && PCI > - select FB_BACKLIGHT if FB_NVIDIA_BACKLIGHT > select FB_CFB_FILLRECT > select FB_CFB_COPYAREA > select FB_CFB_IMAGEBLIT > @@ -700,6 +700,8 @@ config FB_NVIDIA_DEBUG > config FB_NVIDIA_BACKLIGHT > bool "Support for backlight control" > depends on FB_NVIDIA > + depends on BACKLIGHT_CLASS_DEVICE=y || BACKLIGHT_CLASS_DEVICE=FB_NVIDIA Seems wrong. BACKLIGHT_CLASS_DEVICE is of type tristate. There are more of those, please check. Helge
Hi Am 22.12.24 um 07:31 schrieb Helge Deller: > On 12/16/24 08:42, Thomas Zimmermann wrote: >> Do not select BACKLIGHT_CLASS_DEVICE from FB_BACKLIGHT. The latter >> only controls backlight support within fbdev core code and data >> structures. >> >> Make fbdev drivers depend on BACKLIGHT_CLASS_DEVICE and let users >> select it explicitly. Fixes warnings about recursive dependencies, >> such as >> >> error: recursive dependency detected! >> symbol BACKLIGHT_CLASS_DEVICE is selected by FB_BACKLIGHT >> symbol FB_BACKLIGHT is selected by FB_SH_MOBILE_LCDC >> symbol FB_SH_MOBILE_LCDC depends on FB_DEVICE >> symbol FB_DEVICE depends on FB_CORE >> symbol FB_CORE is selected by DRM_GEM_DMA_HELPER >> symbol DRM_GEM_DMA_HELPER is selected by DRM_PANEL_ILITEK_ILI9341 >> symbol DRM_PANEL_ILITEK_ILI9341 depends on BACKLIGHT_CLASS_DEVICE >> >> BACKLIGHT_CLASS_DEVICE is user-selectable, so making drivers adapt to >> it is the correct approach in any case. For most drivers, backlight >> support is also configurable separately. >> >> v3: >> - Select BACKLIGHT_CLASS_DEVICE in PowerMac defconfigs (Christophe) >> - Fix PMAC_BACKLIGHT module dependency corner cases (Christophe) >> v2: >> - s/BACKLIGHT_DEVICE_CLASS/BACKLIGHT_CLASS_DEVICE (Helge) >> - Fix fbdev driver-dependency corner case (Arnd) >> >> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> >> --- >> arch/powerpc/configs/pmac32_defconfig | 1 + >> arch/powerpc/configs/ppc6xx_defconfig | 1 + >> drivers/auxdisplay/Kconfig | 2 +- >> drivers/macintosh/Kconfig | 1 + >> drivers/staging/fbtft/Kconfig | 1 + >> drivers/video/fbdev/Kconfig | 18 +++++++++++++----- >> drivers/video/fbdev/core/Kconfig | 3 +-- >> 7 files changed, 19 insertions(+), 8 deletions(-) >> >> ... >> diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig >> index de035071fedb..55c6686f091e 100644 >> --- a/drivers/video/fbdev/Kconfig >> +++ b/drivers/video/fbdev/Kconfig >> @@ -649,6 +649,7 @@ config FB_S1D13XXX >> config FB_ATMEL >> tristate "AT91 LCD Controller support" >> depends on FB && OF && HAVE_CLK && HAS_IOMEM >> + depends on BACKLIGHT_CLASS_DEVICE >> depends on HAVE_FB_ATMEL || COMPILE_TEST >> select FB_BACKLIGHT >> select FB_IOMEM_HELPERS >> @@ -660,7 +661,6 @@ config FB_ATMEL >> config FB_NVIDIA >> tristate "nVidia Framebuffer Support" >> depends on FB && PCI >> - select FB_BACKLIGHT if FB_NVIDIA_BACKLIGHT >> select FB_CFB_FILLRECT >> select FB_CFB_COPYAREA >> select FB_CFB_IMAGEBLIT >> @@ -700,6 +700,8 @@ config FB_NVIDIA_DEBUG >> config FB_NVIDIA_BACKLIGHT >> bool "Support for backlight control" >> depends on FB_NVIDIA >> + depends on BACKLIGHT_CLASS_DEVICE=y || >> BACKLIGHT_CLASS_DEVICE=FB_NVIDIA > > Seems wrong. BACKLIGHT_CLASS_DEVICE is of type tristate. > There are more of those, please check. It's exactly correct. Linking would fail with FB_NVIDIA=y and BACKLIGHT=m. The above construct avoids this case. Please see Arnd's review comment at [1]. That's also why I mentioned that 'imply' could be used rather than 'depends on'. It would handle this situation automatically. Best regards Thomas [1] https://patchwork.freedesktop.org/patch/628099/?series=142356&rev=1 > > Helge
On 12/22/24 17:09, Thomas Zimmermann wrote: > Hi > > > Am 22.12.24 um 07:31 schrieb Helge Deller: >> On 12/16/24 08:42, Thomas Zimmermann wrote: >>> Do not select BACKLIGHT_CLASS_DEVICE from FB_BACKLIGHT. The latter >>> only controls backlight support within fbdev core code and data >>> structures. >>> >>> Make fbdev drivers depend on BACKLIGHT_CLASS_DEVICE and let users >>> select it explicitly. Fixes warnings about recursive dependencies, >>> such as >>> >>> error: recursive dependency detected! >>> symbol BACKLIGHT_CLASS_DEVICE is selected by FB_BACKLIGHT >>> symbol FB_BACKLIGHT is selected by FB_SH_MOBILE_LCDC >>> symbol FB_SH_MOBILE_LCDC depends on FB_DEVICE >>> symbol FB_DEVICE depends on FB_CORE >>> symbol FB_CORE is selected by DRM_GEM_DMA_HELPER >>> symbol DRM_GEM_DMA_HELPER is selected by DRM_PANEL_ILITEK_ILI9341 >>> symbol DRM_PANEL_ILITEK_ILI9341 depends on BACKLIGHT_CLASS_DEVICE >>> >>> BACKLIGHT_CLASS_DEVICE is user-selectable, so making drivers adapt to >>> it is the correct approach in any case. For most drivers, backlight >>> support is also configurable separately. >>> >>> v3: >>> - Select BACKLIGHT_CLASS_DEVICE in PowerMac defconfigs (Christophe) >>> - Fix PMAC_BACKLIGHT module dependency corner cases (Christophe) >>> v2: >>> - s/BACKLIGHT_DEVICE_CLASS/BACKLIGHT_CLASS_DEVICE (Helge) >>> - Fix fbdev driver-dependency corner case (Arnd) >>> >>> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> >>> --- >>> arch/powerpc/configs/pmac32_defconfig | 1 + >>> arch/powerpc/configs/ppc6xx_defconfig | 1 + >>> drivers/auxdisplay/Kconfig | 2 +- >>> drivers/macintosh/Kconfig | 1 + >>> drivers/staging/fbtft/Kconfig | 1 + >>> drivers/video/fbdev/Kconfig | 18 +++++++++++++----- >>> drivers/video/fbdev/core/Kconfig | 3 +-- >>> 7 files changed, 19 insertions(+), 8 deletions(-) >>> >>> ... >>> diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig >>> index de035071fedb..55c6686f091e 100644 >>> --- a/drivers/video/fbdev/Kconfig >>> +++ b/drivers/video/fbdev/Kconfig >>> @@ -649,6 +649,7 @@ config FB_S1D13XXX >>> config FB_ATMEL >>> tristate "AT91 LCD Controller support" >>> depends on FB && OF && HAVE_CLK && HAS_IOMEM >>> + depends on BACKLIGHT_CLASS_DEVICE >>> depends on HAVE_FB_ATMEL || COMPILE_TEST >>> select FB_BACKLIGHT >>> select FB_IOMEM_HELPERS >>> @@ -660,7 +661,6 @@ config FB_ATMEL >>> config FB_NVIDIA >>> tristate "nVidia Framebuffer Support" >>> depends on FB && PCI >>> - select FB_BACKLIGHT if FB_NVIDIA_BACKLIGHT >>> select FB_CFB_FILLRECT >>> select FB_CFB_COPYAREA >>> select FB_CFB_IMAGEBLIT >>> @@ -700,6 +700,8 @@ config FB_NVIDIA_DEBUG >>> config FB_NVIDIA_BACKLIGHT >>> bool "Support for backlight control" >>> depends on FB_NVIDIA >>> + depends on BACKLIGHT_CLASS_DEVICE=y || BACKLIGHT_CLASS_DEVICE=FB_NVIDIA >> >> Seems wrong. BACKLIGHT_CLASS_DEVICE is of type tristate. >> There are more of those, please check. > > It's exactly correct. Linking would fail with FB_NVIDIA=y and BACKLIGHT=m. The above construct avoids this case. Please see Arnd's review comment at [1]. I'm not arguing against "depends on BACKLIGHT_CLASS_DEVICE=y". It's the "BACKLIGHT_CLASS_DEVICE=FB_NVIDIA" which is wrong. BACKLIGHT_CLASS_DEVICE is tristate, so either "y", "n" or "m", but never "FB_NVIDIA". > That's also why I mentioned that 'imply' could be used rather than 'depends on'. It would handle this situation automatically. > > Best regards > Thomas > > [1] https://patchwork.freedesktop.org/patch/628099/?series=142356&rev=1
On Sun, Dec 22, 2024, at 21:15, Helge Deller wrote: > On 12/22/24 17:09, Thomas Zimmermann wrote: >>>> + depends on BACKLIGHT_CLASS_DEVICE=y || BACKLIGHT_CLASS_DEVICE=FB_NVIDIA >>> >>> Seems wrong. BACKLIGHT_CLASS_DEVICE is of type tristate. >>> There are more of those, please check. >> >> It's exactly correct. Linking would fail with FB_NVIDIA=y and BACKLIGHT=m. The above construct avoids this case. Please see Arnd's review comment at [1]. > > I'm not arguing against "depends on BACKLIGHT_CLASS_DEVICE=y". > It's the "BACKLIGHT_CLASS_DEVICE=FB_NVIDIA" which is wrong. > BACKLIGHT_CLASS_DEVICE is tristate, so either "y", "n" or "m", but > never "FB_NVIDIA". There are multiple ways to express this, but that line is a correct way to allow all of BACKLIGHT_CLASS_DEVICE=y, FB_NVIDIA=m, FB_NVIDIA_BACKLIGHT=y BACKLIGHT_CLASS_DEVICE=y, FB_NVIDIA=y, FB_NVIDIA_BACKLIGHT=y BACKLIGHT_CLASS_DEVICE=m, FB_NVIDIA=m, FB_NVIDIA_BACKLIGHT=y but disallow the broken BACKLIGHT_CLASS_DEVICE=m, FB_NVIDIA=y, FB_NVIDIA_BACKLIGHT=y If you find this line too confusing, can you suggest a different expression that has the same behavior? Arnd
On 12/22/24 21:50, Arnd Bergmann wrote: > On Sun, Dec 22, 2024, at 21:15, Helge Deller wrote: >> On 12/22/24 17:09, Thomas Zimmermann wrote: > >>>>> + depends on BACKLIGHT_CLASS_DEVICE=y || BACKLIGHT_CLASS_DEVICE=FB_NVIDIA >>>> >>>> Seems wrong. BACKLIGHT_CLASS_DEVICE is of type tristate. >>>> There are more of those, please check. >>> >>> It's exactly correct. Linking would fail with FB_NVIDIA=y and BACKLIGHT=m. The above construct avoids this case. Please see Arnd's review comment at [1]. >> >> I'm not arguing against "depends on BACKLIGHT_CLASS_DEVICE=y". >> It's the "BACKLIGHT_CLASS_DEVICE=FB_NVIDIA" which is wrong. >> BACKLIGHT_CLASS_DEVICE is tristate, so either "y", "n" or "m", but >> never "FB_NVIDIA". > > There are multiple ways to express this, but that line is a correct > way to allow all of > > BACKLIGHT_CLASS_DEVICE=y, FB_NVIDIA=m, FB_NVIDIA_BACKLIGHT=y > BACKLIGHT_CLASS_DEVICE=y, FB_NVIDIA=y, FB_NVIDIA_BACKLIGHT=y > BACKLIGHT_CLASS_DEVICE=m, FB_NVIDIA=m, FB_NVIDIA_BACKLIGHT=y > > but disallow the broken > > BACKLIGHT_CLASS_DEVICE=m, FB_NVIDIA=y, FB_NVIDIA_BACKLIGHT=y Ouch. So, in BACKLIGHT_CLASS_DEVICE=FB_NVIDIA, "FB_NVIDIA" is simply being replaced by the current value of the FB_NVIDIA config option (which is then one of: y/n/m). I didn't thought of that! > If you find this line too confusing, can you suggest a different > expression that has the same behavior? It's confusing, but probably the shortest one. Arnd, thanks for explaining! Thomas, you may add Acked-by: Helge Deller <deller@gmx.de> to the series. In case you want me to take the patch, please let me know. Helge
diff --git a/arch/powerpc/configs/pmac32_defconfig b/arch/powerpc/configs/pmac32_defconfig index 57ded82c2840..e8b3f67bf3f5 100644 --- a/arch/powerpc/configs/pmac32_defconfig +++ b/arch/powerpc/configs/pmac32_defconfig @@ -208,6 +208,7 @@ CONFIG_FB_ATY=y CONFIG_FB_ATY_CT=y CONFIG_FB_ATY_GX=y CONFIG_FB_3DFX=y +CONFIG_BACKLIGHT_CLASS_DEVICE=y # CONFIG_VGA_CONSOLE is not set CONFIG_FRAMEBUFFER_CONSOLE=y CONFIG_LOGO=y diff --git a/arch/powerpc/configs/ppc6xx_defconfig b/arch/powerpc/configs/ppc6xx_defconfig index 4d77e17541e9..ca0c90e95837 100644 --- a/arch/powerpc/configs/ppc6xx_defconfig +++ b/arch/powerpc/configs/ppc6xx_defconfig @@ -716,6 +716,7 @@ CONFIG_FB_TRIDENT=m CONFIG_FB_SM501=m CONFIG_FB_IBM_GXT4500=y CONFIG_LCD_PLATFORM=m +CONFIG_BACKLIGHT_CLASS_DEVICE=y CONFIG_FRAMEBUFFER_CONSOLE=y CONFIG_FRAMEBUFFER_CONSOLE_ROTATION=y CONFIG_LOGO=y diff --git a/drivers/auxdisplay/Kconfig b/drivers/auxdisplay/Kconfig index 21545ffba065..8934e6ad5772 100644 --- a/drivers/auxdisplay/Kconfig +++ b/drivers/auxdisplay/Kconfig @@ -489,7 +489,7 @@ config IMG_ASCII_LCD config HT16K33 tristate "Holtek Ht16K33 LED controller with keyscan" - depends on FB && I2C && INPUT + depends on FB && I2C && INPUT && BACKLIGHT_CLASS_DEVICE select FB_SYSMEM_HELPERS select INPUT_MATRIXKMAP select FB_BACKLIGHT diff --git a/drivers/macintosh/Kconfig b/drivers/macintosh/Kconfig index fb38f684444f..d00e713c1092 100644 --- a/drivers/macintosh/Kconfig +++ b/drivers/macintosh/Kconfig @@ -120,6 +120,7 @@ config PMAC_MEDIABAY config PMAC_BACKLIGHT bool "Backlight control for LCD screens" depends on PPC_PMAC && ADB_PMU && FB = y && (BROKEN || !PPC64) + depends on BACKLIGHT_CLASS_DEVICE=y select FB_BACKLIGHT help Say Y here to enable Macintosh specific extensions of the generic diff --git a/drivers/staging/fbtft/Kconfig b/drivers/staging/fbtft/Kconfig index 77ab44362f16..dcf6a70455cc 100644 --- a/drivers/staging/fbtft/Kconfig +++ b/drivers/staging/fbtft/Kconfig @@ -3,6 +3,7 @@ menuconfig FB_TFT tristate "Support for small TFT LCD display modules" depends on FB && SPI depends on FB_DEVICE + depends on BACKLIGHT_CLASS_DEVICE depends on GPIOLIB || COMPILE_TEST select FB_BACKLIGHT select FB_SYSMEM_HELPERS_DEFERRED diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig index de035071fedb..55c6686f091e 100644 --- a/drivers/video/fbdev/Kconfig +++ b/drivers/video/fbdev/Kconfig @@ -649,6 +649,7 @@ config FB_S1D13XXX config FB_ATMEL tristate "AT91 LCD Controller support" depends on FB && OF && HAVE_CLK && HAS_IOMEM + depends on BACKLIGHT_CLASS_DEVICE depends on HAVE_FB_ATMEL || COMPILE_TEST select FB_BACKLIGHT select FB_IOMEM_HELPERS @@ -660,7 +661,6 @@ config FB_ATMEL config FB_NVIDIA tristate "nVidia Framebuffer Support" depends on FB && PCI - select FB_BACKLIGHT if FB_NVIDIA_BACKLIGHT select FB_CFB_FILLRECT select FB_CFB_COPYAREA select FB_CFB_IMAGEBLIT @@ -700,6 +700,8 @@ config FB_NVIDIA_DEBUG config FB_NVIDIA_BACKLIGHT bool "Support for backlight control" depends on FB_NVIDIA + depends on BACKLIGHT_CLASS_DEVICE=y || BACKLIGHT_CLASS_DEVICE=FB_NVIDIA + select FB_BACKLIGHT default y help Say Y here if you want to control the backlight of your display. @@ -707,7 +709,6 @@ config FB_NVIDIA_BACKLIGHT config FB_RIVA tristate "nVidia Riva support" depends on FB && PCI - select FB_BACKLIGHT if FB_RIVA_BACKLIGHT select FB_CFB_FILLRECT select FB_CFB_COPYAREA select FB_CFB_IMAGEBLIT @@ -747,6 +748,8 @@ config FB_RIVA_DEBUG config FB_RIVA_BACKLIGHT bool "Support for backlight control" depends on FB_RIVA + depends on BACKLIGHT_CLASS_DEVICE=y || BACKLIGHT_CLASS_DEVICE=FB_RIVA + select FB_BACKLIGHT default y help Say Y here if you want to control the backlight of your display. @@ -934,7 +937,6 @@ config FB_MATROX_MAVEN config FB_RADEON tristate "ATI Radeon display support" depends on FB && PCI - select FB_BACKLIGHT if FB_RADEON_BACKLIGHT select FB_CFB_FILLRECT select FB_CFB_COPYAREA select FB_CFB_IMAGEBLIT @@ -960,6 +962,8 @@ config FB_RADEON_I2C config FB_RADEON_BACKLIGHT bool "Support for backlight control" depends on FB_RADEON + depends on BACKLIGHT_CLASS_DEVICE=y || BACKLIGHT_CLASS_DEVICE=FB_RADEON + select FB_BACKLIGHT default y help Say Y here if you want to control the backlight of your display. @@ -975,7 +979,6 @@ config FB_RADEON_DEBUG config FB_ATY128 tristate "ATI Rage128 display support" depends on FB && PCI - select FB_BACKLIGHT if FB_ATY128_BACKLIGHT select FB_IOMEM_HELPERS select FB_MACMODES if PPC_PMAC help @@ -989,6 +992,8 @@ config FB_ATY128 config FB_ATY128_BACKLIGHT bool "Support for backlight control" depends on FB_ATY128 + depends on BACKLIGHT_CLASS_DEVICE=y || BACKLIGHT_CLASS_DEVICE=FB_ATY128 + select FB_BACKLIGHT default y help Say Y here if you want to control the backlight of your display. @@ -999,7 +1004,6 @@ config FB_ATY select FB_CFB_FILLRECT select FB_CFB_COPYAREA select FB_CFB_IMAGEBLIT - select FB_BACKLIGHT if FB_ATY_BACKLIGHT select FB_IOMEM_FOPS select FB_MACMODES if PPC select FB_ATY_CT if SPARC64 && PCI @@ -1040,6 +1044,8 @@ config FB_ATY_GX config FB_ATY_BACKLIGHT bool "Support for backlight control" depends on FB_ATY + depends on BACKLIGHT_CLASS_DEVICE=y || BACKLIGHT_CLASS_DEVICE=FB_ATY + select FB_BACKLIGHT default y help Say Y here if you want to control the backlight of your display. @@ -1528,6 +1534,7 @@ config FB_SH_MOBILE_LCDC depends on FB && HAVE_CLK && HAS_IOMEM depends on SUPERH || COMPILE_TEST depends on FB_DEVICE + depends on BACKLIGHT_CLASS_DEVICE select FB_BACKLIGHT select FB_DEFERRED_IO select FB_DMAMEM_HELPERS @@ -1793,6 +1800,7 @@ config FB_SSD1307 tristate "Solomon SSD1307 framebuffer support" depends on FB && I2C depends on GPIOLIB || COMPILE_TEST + depends on BACKLIGHT_CLASS_DEVICE select FB_BACKLIGHT select FB_SYSMEM_HELPERS_DEFERRED help diff --git a/drivers/video/fbdev/core/Kconfig b/drivers/video/fbdev/core/Kconfig index 0ab8848ba2f1..d554d8c543d4 100644 --- a/drivers/video/fbdev/core/Kconfig +++ b/drivers/video/fbdev/core/Kconfig @@ -183,9 +183,8 @@ config FB_SYSMEM_HELPERS_DEFERRED select FB_SYSMEM_HELPERS config FB_BACKLIGHT - tristate + bool depends on FB - select BACKLIGHT_CLASS_DEVICE config FB_MODE_HELPERS bool "Enable Video Mode Handling Helpers"
Do not select BACKLIGHT_CLASS_DEVICE from FB_BACKLIGHT. The latter only controls backlight support within fbdev core code and data structures. Make fbdev drivers depend on BACKLIGHT_CLASS_DEVICE and let users select it explicitly. Fixes warnings about recursive dependencies, such as error: recursive dependency detected! symbol BACKLIGHT_CLASS_DEVICE is selected by FB_BACKLIGHT symbol FB_BACKLIGHT is selected by FB_SH_MOBILE_LCDC symbol FB_SH_MOBILE_LCDC depends on FB_DEVICE symbol FB_DEVICE depends on FB_CORE symbol FB_CORE is selected by DRM_GEM_DMA_HELPER symbol DRM_GEM_DMA_HELPER is selected by DRM_PANEL_ILITEK_ILI9341 symbol DRM_PANEL_ILITEK_ILI9341 depends on BACKLIGHT_CLASS_DEVICE BACKLIGHT_CLASS_DEVICE is user-selectable, so making drivers adapt to it is the correct approach in any case. For most drivers, backlight support is also configurable separately. v3: - Select BACKLIGHT_CLASS_DEVICE in PowerMac defconfigs (Christophe) - Fix PMAC_BACKLIGHT module dependency corner cases (Christophe) v2: - s/BACKLIGHT_DEVICE_CLASS/BACKLIGHT_CLASS_DEVICE (Helge) - Fix fbdev driver-dependency corner case (Arnd) Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> --- arch/powerpc/configs/pmac32_defconfig | 1 + arch/powerpc/configs/ppc6xx_defconfig | 1 + drivers/auxdisplay/Kconfig | 2 +- drivers/macintosh/Kconfig | 1 + drivers/staging/fbtft/Kconfig | 1 + drivers/video/fbdev/Kconfig | 18 +++++++++++++----- drivers/video/fbdev/core/Kconfig | 3 +-- 7 files changed, 19 insertions(+), 8 deletions(-)