linux-kernel - Re: [PATCH 2/2] Revert "fbcon: Disable accelerated scrolling"

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Message-ID: <2fc200bb-4b40-7833-31c9-90a78512b601@redhat.com>
Date:   Mon, 24 Jan 2022 12:50:20 +0100
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Thomas Zimmermann <tzimmermann@...e.de>,
        Helge Deller <deller@....de>, Gerd Hoffmann <kraxel@...hat.com>
Cc:     linux-fbdev@...r.kernel.org, Pavel Machek <pavel@....cz>,
        Sam Ravnborg <sam@...nborg.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sven Schnelle <svens@...ckframe.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Claudio Suarez <cssk@...-c.es>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 2/2] Revert "fbcon: Disable accelerated scrolling"

On 1/24/22 12:33, Thomas Zimmermann wrote:

[snip]

>> Thoughts?
> 
> I can't say I approve keeping fbdev alive, but...
> 
> With fbdev emulation, every DRM driver is an fbdev driver too. So 
> CONFIG_FB_DRIVER is somewhat misleading. Better add an option like 
> CONFIG_FBCON_HW_SCROLLING and have it selected by the fbdev drivers that 
> absolutely need HW acceleration. That option would then protect the rsp 
> code.
>

Agreed that this option would be better and allow distros
to disable the code that was reverted.
 
Best regards,
-- 
Javier Martinez Canillas
Linux Engineering
Red Hat