[PATCH] drm: Drop select FRAMEBUFFER_CONSOLE for DRM_FBDEV_EMULATION

[PATCH] drm: Drop select FRAMEBUFFER_CONSOLE for DRM_FBDEV_EMULATION

[Javier Martinez Canillas]

The commit c242f48433e7 ("drm: Make FB_CORE to be selected if DRM fbdev
emulation is enabled") changed DRM_FBDEV_EMULATION from 'depends on FB'
to an effective 'select FB_CORE', so any config that previously had DRM=y
and FB=n now has FB_CORE=y and FRAMEBUFFER_CONSOLE=y.

This leads to unmet direct dependencies detected for FRAMEBUFFER_CONSOLE
as reported by Arthur Grillo, e.g:

WARNING: unmet direct dependencies detected for FRAMEBUFFER_CONSOLE
  Depends on [n]: VT [=n] && FB_CORE [=y] && !UML [=y]
  Selected by [y]:
  - DRM_FBDEV_EMULATION [=y] && HAS_IOMEM [=y] && DRM [=y] && !EXPERT [=n]

Arnd Bergmann suggests to drop the select FRAMEBUFFER_CONSOLE for the
DRM_FBDEV_EMULATION Kconfig symbol, since a possible use case could
be to enable DRM fbdev emulation but without a framebuffer console.

Fixes: c242f48433e7 ("drm: Make FB_CORE to be selected if DRM fbdev emulation is enabled")
Reported-by: Arthur Grillo <arthurgrillo@riseup.net>
Closes: https://lore.kernel.org/dri-devel/20230726220325.278976-1-arthurgrillo@riseup.net
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---

 drivers/gpu/drm/Kconfig | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index b51c6a141dfa..2a44b9419d4d 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -135,7 +135,6 @@ config DRM_DEBUG_MODESET_LOCK
 config DRM_FBDEV_EMULATION
 	bool "Enable legacy fbdev support for your modesetting driver"
 	depends on DRM
-	select FRAMEBUFFER_CONSOLE if !EXPERT
 	select FRAMEBUFFER_CONSOLE_DETECT_PRIMARY if FRAMEBUFFER_CONSOLE
 	default y
 	help
-- 
2.41.0

Re: [PATCH] drm: Drop select FRAMEBUFFER_CONSOLE for DRM_FBDEV_EMULATION

[Daniel Vetter]

On Fri, 4 Aug 2023 at 14:52, Javier Martinez Canillas
<javierm@redhat.com> wrote:
>
> The commit c242f48433e7 ("drm: Make FB_CORE to be selected if DRM fbdev
> emulation is enabled") changed DRM_FBDEV_EMULATION from 'depends on FB'
> to an effective 'select FB_CORE', so any config that previously had DRM=y
> and FB=n now has FB_CORE=y and FRAMEBUFFER_CONSOLE=y.
>
> This leads to unmet direct dependencies detected for FRAMEBUFFER_CONSOLE
> as reported by Arthur Grillo, e.g:
>
> WARNING: unmet direct dependencies detected for FRAMEBUFFER_CONSOLE
>   Depends on [n]: VT [=n] && FB_CORE [=y] && !UML [=y]
>   Selected by [y]:
>   - DRM_FBDEV_EMULATION [=y] && HAS_IOMEM [=y] && DRM [=y] && !EXPERT [=n]
>
> Arnd Bergmann suggests to drop the select FRAMEBUFFER_CONSOLE for the
> DRM_FBDEV_EMULATION Kconfig symbol, since a possible use case could
> be to enable DRM fbdev emulation but without a framebuffer console.
>
> Fixes: c242f48433e7 ("drm: Make FB_CORE to be selected if DRM fbdev emulation is enabled")
> Reported-by: Arthur Grillo <arthurgrillo@riseup.net>
> Closes: https://lore.kernel.org/dri-devel/20230726220325.278976-1-arthurgrillo@riseup.net
> Suggested-by: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>

Yeah originally this was just to help people not misconfigure their
kernels and end up with a black screen. But select is really not a
nice way to do that, imo we could drop the FB_CORE select too :-)

Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>

Cheers, Sima

> ---
>
>  drivers/gpu/drm/Kconfig | 1 -
>  1 file changed, 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index b51c6a141dfa..2a44b9419d4d 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -135,7 +135,6 @@ config DRM_DEBUG_MODESET_LOCK
>  config DRM_FBDEV_EMULATION
>         bool "Enable legacy fbdev support for your modesetting driver"
>         depends on DRM
> -       select FRAMEBUFFER_CONSOLE if !EXPERT
>         select FRAMEBUFFER_CONSOLE_DETECT_PRIMARY if FRAMEBUFFER_CONSOLE
>         default y
>         help
> --
> 2.41.0
>


-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

Re: [PATCH] drm: Drop select FRAMEBUFFER_CONSOLE for DRM_FBDEV_EMULATION

[Arnd Bergmann]

On Fri, Aug 4, 2023, at 15:07, Daniel Vetter wrote:
> On Fri, 4 Aug 2023 at 14:52, Javier Martinez Canillas
> <javierm@redhat.com> wrote:
>>
>> The commit c242f48433e7 ("drm: Make FB_CORE to be selected if DRM fbdev
>> emulation is enabled") changed DRM_FBDEV_EMULATION from 'depends on FB'
>> to an effective 'select FB_CORE', so any config that previously had DRM=y
>> and FB=n now has FB_CORE=y and FRAMEBUFFER_CONSOLE=y.
>>
>> This leads to unmet direct dependencies detected for FRAMEBUFFER_CONSOLE
>> as reported by Arthur Grillo, e.g:
>>
>> WARNING: unmet direct dependencies detected for FRAMEBUFFER_CONSOLE
>>   Depends on [n]: VT [=n] && FB_CORE [=y] && !UML [=y]
>>   Selected by [y]:
>>   - DRM_FBDEV_EMULATION [=y] && HAS_IOMEM [=y] && DRM [=y] && !EXPERT [=n]
>>
>> Arnd Bergmann suggests to drop the select FRAMEBUFFER_CONSOLE for the
>> DRM_FBDEV_EMULATION Kconfig symbol, since a possible use case could
>> be to enable DRM fbdev emulation but without a framebuffer console.
>>
>> Fixes: c242f48433e7 ("drm: Make FB_CORE to be selected if DRM fbdev emulation is enabled")
>> Reported-by: Arthur Grillo <arthurgrillo@riseup.net>
>> Closes: https://lore.kernel.org/dri-devel/20230726220325.278976-1-arthurgrillo@riseup.net
>> Suggested-by: Arnd Bergmann <arnd@arndb.de>
>> Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
>
> Yeah originally this was just to help people not misconfigure their
> kernels and end up with a black screen. But select is really not a
> nice way to do that, imo we could drop the FB_CORE select too :-)

Droping the 'FB_CORE' select only works if we make FB_CORE user
visible and add a 'depends on' for it instead. Not sure this
is any better since this would only ever be used when either
CONFIG_FB or CONFIG_DRM_FBDEV_EMULATION is enabled.


     Arnd

Re: [PATCH] drm: Drop select FRAMEBUFFER_CONSOLE for DRM_FBDEV_EMULATION

[Javier Martinez Canillas]

"Arnd Bergmann" <arnd@arndb.de> writes:

> On Fri, Aug 4, 2023, at 15:07, Daniel Vetter wrote:
>> On Fri, 4 Aug 2023 at 14:52, Javier Martinez Canillas
>> <javierm@redhat.com> wrote:
>>>
>>> The commit c242f48433e7 ("drm: Make FB_CORE to be selected if DRM fbdev
>>> emulation is enabled") changed DRM_FBDEV_EMULATION from 'depends on FB'
>>> to an effective 'select FB_CORE', so any config that previously had DRM=y
>>> and FB=n now has FB_CORE=y and FRAMEBUFFER_CONSOLE=y.
>>>
>>> This leads to unmet direct dependencies detected for FRAMEBUFFER_CONSOLE
>>> as reported by Arthur Grillo, e.g:
>>>
>>> WARNING: unmet direct dependencies detected for FRAMEBUFFER_CONSOLE
>>>   Depends on [n]: VT [=n] && FB_CORE [=y] && !UML [=y]
>>>   Selected by [y]:
>>>   - DRM_FBDEV_EMULATION [=y] && HAS_IOMEM [=y] && DRM [=y] && !EXPERT [=n]
>>>
>>> Arnd Bergmann suggests to drop the select FRAMEBUFFER_CONSOLE for the
>>> DRM_FBDEV_EMULATION Kconfig symbol, since a possible use case could
>>> be to enable DRM fbdev emulation but without a framebuffer console.
>>>
>>> Fixes: c242f48433e7 ("drm: Make FB_CORE to be selected if DRM fbdev emulation is enabled")
>>> Reported-by: Arthur Grillo <arthurgrillo@riseup.net>
>>> Closes: https://lore.kernel.org/dri-devel/20230726220325.278976-1-arthurgrillo@riseup.net
>>> Suggested-by: Arnd Bergmann <arnd@arndb.de>
>>> Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
>>
>> Yeah originally this was just to help people not misconfigure their
>> kernels and end up with a black screen. But select is really not a
>> nice way to do that, imo we could drop the FB_CORE select too :-)
>
> Droping the 'FB_CORE' select only works if we make FB_CORE user
> visible and add a 'depends on' for it instead. Not sure this
> is any better since this would only ever be used when either
> CONFIG_FB or CONFIG_DRM_FBDEV_EMULATION is enabled.
>

Agreed.

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat

Re: [PATCH] drm: Drop select FRAMEBUFFER_CONSOLE for DRM_FBDEV_EMULATION

[Arthur Grillo]

On 04/08/23 09:51, Javier Martinez Canillas wrote:
> The commit c242f48433e7 ("drm: Make FB_CORE to be selected if DRM fbdev
> emulation is enabled") changed DRM_FBDEV_EMULATION from 'depends on FB'
> to an effective 'select FB_CORE', so any config that previously had DRM=y
> and FB=n now has FB_CORE=y and FRAMEBUFFER_CONSOLE=y.
> 
> This leads to unmet direct dependencies detected for FRAMEBUFFER_CONSOLE
> as reported by Arthur Grillo, e.g:
> 
> WARNING: unmet direct dependencies detected for FRAMEBUFFER_CONSOLE
>   Depends on [n]: VT [=n] && FB_CORE [=y] && !UML [=y]
>   Selected by [y]:
>   - DRM_FBDEV_EMULATION [=y] && HAS_IOMEM [=y] && DRM [=y] && !EXPERT [=n]
> 
> Arnd Bergmann suggests to drop the select FRAMEBUFFER_CONSOLE for the
> DRM_FBDEV_EMULATION Kconfig symbol, since a possible use case could
> be to enable DRM fbdev emulation but without a framebuffer console.
> 
> Fixes: c242f48433e7 ("drm: Make FB_CORE to be selected if DRM fbdev emulation is enabled")
> Reported-by: Arthur Grillo <arthurgrillo@riseup.net>
> Closes: https://lore.kernel.org/dri-devel/20230726220325.278976-1-arthurgrillo@riseup.net
> Suggested-by: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
> ---

Greate patch! I was about to send the same one XD.

Reviewed-by: Arthur Grillo <arthurgrillo@riseup.net>

Best Regards,
~Arthur Grillo

> 
>  drivers/gpu/drm/Kconfig | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index b51c6a141dfa..2a44b9419d4d 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -135,7 +135,6 @@ config DRM_DEBUG_MODESET_LOCK
>  config DRM_FBDEV_EMULATION
>  	bool "Enable legacy fbdev support for your modesetting driver"
>  	depends on DRM
> -	select FRAMEBUFFER_CONSOLE if !EXPERT
>  	select FRAMEBUFFER_CONSOLE_DETECT_PRIMARY if FRAMEBUFFER_CONSOLE
>  	default y
>  	help

Re: [PATCH] drm: Drop select FRAMEBUFFER_CONSOLE for DRM_FBDEV_EMULATION

[Javier Martinez Canillas]

Arthur Grillo <arthurgrillo@riseup.net> writes:

> On 04/08/23 09:51, Javier Martinez Canillas wrote:
>> The commit c242f48433e7 ("drm: Make FB_CORE to be selected if DRM fbdev
>> emulation is enabled") changed DRM_FBDEV_EMULATION from 'depends on FB'
>> to an effective 'select FB_CORE', so any config that previously had DRM=y
>> and FB=n now has FB_CORE=y and FRAMEBUFFER_CONSOLE=y.
>> 
>> This leads to unmet direct dependencies detected for FRAMEBUFFER_CONSOLE
>> as reported by Arthur Grillo, e.g:
>> 
>> WARNING: unmet direct dependencies detected for FRAMEBUFFER_CONSOLE
>>   Depends on [n]: VT [=n] && FB_CORE [=y] && !UML [=y]
>>   Selected by [y]:
>>   - DRM_FBDEV_EMULATION [=y] && HAS_IOMEM [=y] && DRM [=y] && !EXPERT [=n]
>> 
>> Arnd Bergmann suggests to drop the select FRAMEBUFFER_CONSOLE for the
>> DRM_FBDEV_EMULATION Kconfig symbol, since a possible use case could
>> be to enable DRM fbdev emulation but without a framebuffer console.
>> 
>> Fixes: c242f48433e7 ("drm: Make FB_CORE to be selected if DRM fbdev emulation is enabled")
>> Reported-by: Arthur Grillo <arthurgrillo@riseup.net>
>> Closes: https://lore.kernel.org/dri-devel/20230726220325.278976-1-arthurgrillo@riseup.net
>> Suggested-by: Arnd Bergmann <arnd@arndb.de>
>> Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
>> ---
>
> Greate patch! I was about to send the same one XD.
>
> Reviewed-by: Arthur Grillo <arthurgrillo@riseup.net>
>

Pushed to drm-misc (drm-misc-next). Thanks!

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat

Re: [PATCH] drm: Drop select FRAMEBUFFER_CONSOLE for DRM_FBDEV_EMULATION

[Randy Dunlap]

On 8/4/23 05:51, Javier Martinez Canillas wrote:
> The commit c242f48433e7 ("drm: Make FB_CORE to be selected if DRM fbdev
> emulation is enabled") changed DRM_FBDEV_EMULATION from 'depends on FB'
> to an effective 'select FB_CORE', so any config that previously had DRM=y
> and FB=n now has FB_CORE=y and FRAMEBUFFER_CONSOLE=y.
> 
> This leads to unmet direct dependencies detected for FRAMEBUFFER_CONSOLE
> as reported by Arthur Grillo, e.g:
> 
> WARNING: unmet direct dependencies detected for FRAMEBUFFER_CONSOLE
>   Depends on [n]: VT [=n] && FB_CORE [=y] && !UML [=y]
>   Selected by [y]:
>   - DRM_FBDEV_EMULATION [=y] && HAS_IOMEM [=y] && DRM [=y] && !EXPERT [=n]
> 
> Arnd Bergmann suggests to drop the select FRAMEBUFFER_CONSOLE for the
> DRM_FBDEV_EMULATION Kconfig symbol, since a possible use case could
> be to enable DRM fbdev emulation but without a framebuffer console.
> 
> Fixes: c242f48433e7 ("drm: Make FB_CORE to be selected if DRM fbdev emulation is enabled")
> Reported-by: Arthur Grillo <arthurgrillo@riseup.net>
> Closes: https://lore.kernel.org/dri-devel/20230726220325.278976-1-arthurgrillo@riseup.net
> Suggested-by: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>

Acked-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org> # build-tested

Thanks.

> ---
> 
>  drivers/gpu/drm/Kconfig | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index b51c6a141dfa..2a44b9419d4d 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -135,7 +135,6 @@ config DRM_DEBUG_MODESET_LOCK
>  config DRM_FBDEV_EMULATION
>  	bool "Enable legacy fbdev support for your modesetting driver"
>  	depends on DRM
> -	select FRAMEBUFFER_CONSOLE if !EXPERT
>  	select FRAMEBUFFER_CONSOLE_DETECT_PRIMARY if FRAMEBUFFER_CONSOLE
>  	default y
>  	help

-- 
~Randy

Re: [PATCH] drm: Drop select FRAMEBUFFER_CONSOLE for DRM_FBDEV_EMULATION

[Javier Martinez Canillas]

Randy Dunlap <rdunlap@infradead.org> writes:

Hello Randy,

> On 8/4/23 05:51, Javier Martinez Canillas wrote:
>> The commit c242f48433e7 ("drm: Make FB_CORE to be selected if DRM fbdev
>> emulation is enabled") changed DRM_FBDEV_EMULATION from 'depends on FB'
>> to an effective 'select FB_CORE', so any config that previously had DRM=y
>> and FB=n now has FB_CORE=y and FRAMEBUFFER_CONSOLE=y.
>> 
>> This leads to unmet direct dependencies detected for FRAMEBUFFER_CONSOLE
>> as reported by Arthur Grillo, e.g:
>> 
>> WARNING: unmet direct dependencies detected for FRAMEBUFFER_CONSOLE
>>   Depends on [n]: VT [=n] && FB_CORE [=y] && !UML [=y]
>>   Selected by [y]:
>>   - DRM_FBDEV_EMULATION [=y] && HAS_IOMEM [=y] && DRM [=y] && !EXPERT [=n]
>> 
>> Arnd Bergmann suggests to drop the select FRAMEBUFFER_CONSOLE for the
>> DRM_FBDEV_EMULATION Kconfig symbol, since a possible use case could
>> be to enable DRM fbdev emulation but without a framebuffer console.
>> 
>> Fixes: c242f48433e7 ("drm: Make FB_CORE to be selected if DRM fbdev emulation is enabled")
>> Reported-by: Arthur Grillo <arthurgrillo@riseup.net>
>> Closes: https://lore.kernel.org/dri-devel/20230726220325.278976-1-arthurgrillo@riseup.net
>> Suggested-by: Arnd Bergmann <arnd@arndb.de>
>> Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
>
> Acked-by: Randy Dunlap <rdunlap@infradead.org>
> Tested-by: Randy Dunlap <rdunlap@infradead.org> # build-tested
>

I have already pushed this patch so I won't be able to add these tags but
thanks a lot for testing and confirming that the patch fixes your issue!

> Thanks.
>
>

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat