linux-kernel - Re: [PATCH 0/6] arch, sysfb: Move screen and edid info into single place

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Message-ID: <6dff8e7e-c99b-443d-a1d8-22650ca0b595@suse.de>
Date: Fri, 21 Nov 2025 17:09:44 +0100
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Ard Biesheuvel <ardb@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>,
 Javier Martinez Canillas <javierm@...hat.com>, x86@...nel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-efi@...r.kernel.org, loongarch@...ts.linux.dev,
 linux-riscv@...ts.infradead.org, dri-devel@...ts.freedesktop.org,
 linux-hyperv@...r.kernel.org, linux-pci@...r.kernel.org,
 linux-fbdev@...r.kernel.org
Subject: Re: [PATCH 0/6] arch, sysfb: Move screen and edid info into single
 place



Am 21.11.25 um 17:08 schrieb Thomas Zimmermann:
> Hi
>
> Am 21.11.25 um 16:56 schrieb Ard Biesheuvel:
>> On Fri, 21 Nov 2025 at 16:53, Thomas Zimmermann <tzimmermann@...e.de> 
>> wrote:
>>> Hi
>>>
>>> Am 21.11.25 um 16:16 schrieb Ard Biesheuvel:
>>>> On Fri, 21 Nov 2025 at 16:10, Arnd Bergmann <arnd@...db.de> wrote:
>>>>> On Fri, Nov 21, 2025, at 14:36, Thomas Zimmermann wrote:
>>>>>> Replace screen_info and edid_info with sysfb_primary_device of type
>>>>>> struct sysfb_display_info. Update all users.
>>>>>>
>>>>>> Sysfb DRM drivers currently fetch the global edid_info directly, 
>>>>>> when
>>>>>> they should get that information together with the screen_info 
>>>>>> from their
>>>>>> device. Wrapping screen_info and edid_info in 
>>>>>> sysfb_primary_display and
>>>>>> passing this to drivers enables this.
>>>>>>
>>>>>> Replacing both with sysfb_primary_display has been motivate by 
>>>>>> the EFI
>>>>>> stub. EFI wants to transfer EDID via config table in a single entry.
>>>>>> Using struct sysfb_display_info this will become easily possible. 
>>>>>> Hence
>>>>>> accept some churn in architecture code for the long-term 
>>>>>> improvements.
>>>>> This all looks good to me,
>>>>>
>>>>> Acked-by: Arnd Bergmann <arnd@...db.de>
>>> Thanks
>>>
>>>>> It should also bring us one step closer to eventually
>>>>> disconnecting the x86 boot ABI from the kernel-internal
>>>>> sysfb_primary_display.
>>>>>
>>>> Agreed
>>>>
>>>> Acked-by: Ard Biesheuvel <ardb@...nel.org>
>>> Thanks
>>>
>>>> I can take patches 1-2 right away, if that helps during the next 
>>>> cycle.
>>>   From my sysfb-focused POV, these patches would ideally all go through
>>> the same tree, say efi or generic arch, or whatever fits best. Most of
>>> the other code is only renames anyway.
>>>
>> I don't mind queueing all of it, but I did get a conflict on
>> drivers/pci/vgaarb.c
>
> Probably from a78835b86a44 ("PCI/VGA: Select SCREEN_INFO on X86")

https://lore.kernel.org/all/20251013220829.1536292-1-superm1@kernel.org/


>  that I have in my tree. You can fix it by replacing screen_info with 
> sysfb_primary_display.screen. The later merge conflict seems manageable.
>
> Best regards
> Thomas
>
>

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com
GF: Jochen Jaser, Andrew McDonald, Werner Knoblich, (HRB 36809, AG Nürnberg)