linux-kernel - Re: [PATCH] drm: Drop select FRAMEBUFFER_CONSOLE for DRM_FBDEV

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Date:   Sat, 05 Aug 2023 00:02:33 +0200
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Randy Dunlap <rdunlap@...radead.org>, linux-kernel@...r.kernel.org
Cc:     Arnd Bergmann <arnd@...db.de>,
        Arthur Grillo <arthurgrillo@...eup.net>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...il.com>, Helge Deller <deller@....de>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm: Drop select FRAMEBUFFER_CONSOLE for
 DRM_FBDEV_EMULATION

Randy Dunlap <rdunlap@...radead.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@...eup.net>
>> Closes: https://lore.kernel.org/dri-devel/20230726220325.278976-1-arthurgrillo@riseup.net
>> Suggested-by: Arnd Bergmann <arnd@...db.de>
>> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
>
> Acked-by: Randy Dunlap <rdunlap@...radead.org>
> Tested-by: Randy Dunlap <rdunlap@...radead.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