linux-kernel - Re: [PATCH v2 2/2] drm: Move nomodeset kernel parameter to the DRM subsystem

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Date:   Fri, 5 Nov 2021 10:58:54 +0100
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Thomas Zimmermann <tzimmermann@...e.de>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Cc:     Michel Dänzer <michel@...nzer.net>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Peter Robinson <pbrobinson@...il.com>,
        Pekka Paalanen <pekka.paalanen@...labora.com>,
        Alex Deucher <alexander.deucher@....com>,
        Ben Skeggs <bskeggs@...hat.com>, Chia-I Wu <olvaffe@...il.com>,
        Christian König <christian.koenig@....com>,
        Daniel Vetter <daniel@...ll.ch>,
        Dave Airlie <airlied@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        VMware Graphics <linux-graphics-maintainer@...are.com>,
        Zack Rusin <zackr@...are.com>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        linux-fbdev@...r.kernel.org, nouveau@...ts.freedesktop.org,
        spice-devel@...ts.freedesktop.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 2/2] drm: Move nomodeset kernel parameter to the DRM
 subsystem

On 11/5/21 10:39, Thomas Zimmermann wrote:

[snip]

>>>>    
>>>> +obj-$(CONFIG_VGA_CONSOLE) += drm_nomodeset.o
>>>> +
>>>
>>> This now depends on the VGA textmode console. Even if you have no VGA
>>> console, you'd want drm_nomodeset.o. Simpledrm might be built-in and can
>>> provide graphics. Non-PC systems don't even have a VGA device.
>>
>> This was discussed in an earlier version, which had this builtin but the
>> header still had a stub for CONFIG_VGA_CONSOLE=n.
>>
>>> I think we really want a separate boolean config option that gets
>>> selected by CONFIG_DRM.
>>
>> Perhaps that should be a separate change on top.
> 
> Sure, make it a separate patch.
>

Agreed. I was planning to do it as a follow-up as well and drop the
#ifdef CONFIG_VGA_CONSOLE guard in the header.
 
> We want to make this work on ARM systems. I even have a request to 
> replace offb on Power architecture by simpledrm. So the final config has 
> to be system agnostic.
>

Same, since we want to drop the fbdev drivers in Fedora, for all arches.
 
> Best regards
> Thomas
> 
Best regards,
-- 
Javier Martinez Canillas
Linux Engineering
Red Hat