linux-kernel - Re: [PATCH] fbdev: Have CONFIG_FB

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Date: Wed, 08 May 2024 23:05:58 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Sam Ravnborg" <sam@...nborg.org>
Cc: "Florian Fainelli" <florian.fainelli@...adcom.com>,
 "Daniel Vetter" <daniel@...ll.ch>, linux-kernel@...r.kernel.org,
 "Helge Deller" <deller@....de>, "Thomas Zimmermann" <tzimmermann@...e.de>,
 "Javier Martinez Canillas" <javierm@...hat.com>,
 "open list:FRAMEBUFFER LAYER" <linux-fbdev@...r.kernel.org>,
 "open list:FRAMEBUFFER LAYER" <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH] fbdev: Have CONFIG_FB_NOTIFY be tristate

On Wed, May 8, 2024, at 22:36, Sam Ravnborg wrote:
>> 
>> I think if you want to do a new version, that is likely to run
>> into new problems, given that this part of fbdev is particularly
>> fragile and partly wrong. On the other hand, it would be nice to
>> have a patch to limit the use of the notifiers to the smallest
>> set of kernel configs that actually need it, and leave it turned
>> off for everything else.
>> 
>> These are the ones I could find:
>> 
>> - CONFIG_GUMSTIX_AM200EPD (FB_EVENT_FB_REGISTERED)
>
> I was surprised to see this driver is still around as many other old
> drivers was nuked as part of the pxa cleanup.
> It is the only user of FB_EVENT_FB_REGISTERED - so a potential cleanup
> if the driver is no longer relevant.

We kept gumstix at the time to give a chance to do a DT conversion
using the qemu model, but so far nobody has worked on this. My
feeling is that we'll end up removing it at some point in the
future along with the other legacy PXA board files. 

Even if someone wants to keep working on gumstix DT support for
qemu, I agree that we can probably remove AM200EPD, AM300EPD
and metronomefb, since those are not even modeled by qemu.

     Arnd