linux-kernel - Re: [PATCH 1/3] fbdev: rework FB

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Message-ID: <YXlk3N4n5BeYl6yO@smile.fi.intel.com>
Date:   Wed, 27 Oct 2021 17:40:28 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        intel-gfx@...ts.freedesktop.org,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Arnd Bergmann <arnd@...db.de>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Randy Dunlap <rdunlap@...radead.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] fbdev: rework FB_DDC dependencies

On Wed, Oct 27, 2021 at 03:27:12PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> Selecting FB_DDC currently turns on CONFIG_I2C implicitly,
> which is often not desired and can lead to circular dependencies.
> 
> Change this to a 'depends on' and change all drivers that
> rely on FB_DDC to have an appropriate I2C dependency as well.

No objections from me.
Acked-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/video/fbdev/Kconfig | 17 +++++++++++++----
>  1 file changed, 13 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
> index 6ed5e608dd04..c187a93c9a16 100644
> --- a/drivers/video/fbdev/Kconfig
> +++ b/drivers/video/fbdev/Kconfig
> @@ -62,9 +62,8 @@ config FIRMWARE_EDID
>  
>  config FB_DDC
>  	tristate
> -	depends on FB
> +	depends on FB && I2C
>  	select I2C_ALGOBIT
> -	select I2C
>  
>  config FB_BOOT_VESA_SUPPORT
>  	bool
> @@ -356,6 +355,7 @@ config FB_CYBER2000
>  config FB_CYBER2000_DDC
>  	bool "DDC for CyberPro support"
>  	depends on FB_CYBER2000
> +	depends on I2C=y || I2C=FB_CYBER2000
>  	select FB_DDC
>  	default y
>  	help
> @@ -894,6 +894,7 @@ config FB_NVIDIA
>  config FB_NVIDIA_I2C
>  	bool "Enable DDC Support"
>  	depends on FB_NVIDIA
> +	depends on I2C=y || I2C=FB_NVIDIA
>  	select FB_DDC
>  	help
>  	  This enables I2C support for nVidia Chipsets.  This is used
> @@ -940,6 +941,7 @@ config FB_RIVA
>  config FB_RIVA_I2C
>  	bool "Enable DDC Support"
>  	depends on FB_RIVA
> +	depends on I2C=y || I2C=FB_RIVA
>  	select FB_DDC
>  	help
>  	  This enables I2C support for nVidia Chipsets.  This is used
> @@ -967,7 +969,7 @@ config FB_RIVA_BACKLIGHT
>  
>  config FB_I740
>  	tristate "Intel740 support"
> -	depends on FB && PCI
> +	depends on FB && PCI && I2C
>  	select FB_MODE_HELPERS
>  	select FB_CFB_FILLRECT
>  	select FB_CFB_COPYAREA
> @@ -1021,6 +1023,7 @@ config FB_I810_GTF
>  config FB_I810_I2C
>  	bool "Enable DDC Support"
>  	depends on FB_I810 && FB_I810_GTF
> +	depends on I2C=y || I2C=FB_I810
>  	select FB_DDC
>  	help
>  	  Add DDC/I2C support for i810fb.  This will allow the driver to get
> @@ -1076,6 +1079,7 @@ config FB_INTEL_DEBUG
>  config FB_INTEL_I2C
>  	bool "DDC/I2C for Intel framebuffer support"
>  	depends on FB_INTEL
> +	depends on I2C=y || I2C=FB_INTEL
>  	select FB_DDC
>  	default y
>  	help
> @@ -1155,6 +1159,7 @@ config FB_MATROX_G
>  config FB_MATROX_I2C
>  	tristate "Matrox I2C support"
>  	depends on FB_MATROX
> +	depends on I2C=y || I2C=FB_MATROX
>  	select FB_DDC
>  	help
>  	  This drivers creates I2C buses which are needed for accessing the
> @@ -1220,6 +1225,7 @@ config FB_RADEON
>  config FB_RADEON_I2C
>  	bool "DDC/I2C for ATI Radeon support"
>  	depends on FB_RADEON
> +	depends on I2C=y || I2C=FB_RADEON
>  	select FB_DDC
>  	default y
>  	help
> @@ -1329,6 +1335,7 @@ config FB_S3
>  config FB_S3_DDC
>  	bool "DDC for S3 support"
>  	depends on FB_S3
> +	depends on I2C=y || I2C=FB_S3
>  	select FB_DDC
>  	default y
>  	help
> @@ -1354,6 +1361,7 @@ config FB_SAVAGE
>  config FB_SAVAGE_I2C
>  	bool "Enable DDC2 Support"
>  	depends on FB_SAVAGE
> +	depends on I2C=y || I2C=FB_SAVAGE
>  	select FB_DDC
>  	help
>  	  This enables I2C support for S3 Savage Chipsets.  This is used
> @@ -1493,6 +1501,7 @@ config FB_3DFX_ACCEL
>  config FB_3DFX_I2C
>  	bool "Enable DDC/I2C support"
>  	depends on FB_3DFX
> +	depends on I2C=y || I2C=FB_3DFX
>  	select FB_DDC
>  	default y
>  	help
> @@ -1532,7 +1541,7 @@ config FB_VT8623
>  
>  config FB_TRIDENT
>  	tristate "Trident/CyberXXX/CyberBlade support"
> -	depends on FB && PCI
> +	depends on FB && PCI && I2C
>  	select FB_CFB_FILLRECT
>  	select FB_CFB_COPYAREA
>  	select FB_CFB_IMAGEBLIT
> -- 
> 2.29.2
> 

-- 
With Best Regards,
Andy Shevchenko