linux-kernel - Re: [RFC PATCH] of/platform: Disable sysfb if a simple-framebuffer node is found

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Message-ID: <20231207173037.GA2944721-robh@kernel.org>
Date:   Thu, 7 Dec 2023 11:30:37 -0600
From:   Rob Herring <robh@...nel.org>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     Thomas Zimmermann <tzimmermann@...e.de>,
        Ard Biesheuvel <ardb@...nel.org>, devicetree@...r.kernel.org,
        Sergio Lopez <slp@...hat.com>,
        Sima Vetter <daniel.vetter@...ll.ch>,
        Hector Martin <marcan@...can.st>,
        Andrew Worsley <amworsley@...il.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Frank Rowand <frowand.list@...il.com>
Subject: Re: [RFC PATCH] of/platform: Disable sysfb if a simple-framebuffer
 node is found

On Mon, Dec 04, 2023 at 05:05:30PM +0100, Javier Martinez Canillas wrote:
> Rob Herring <robh@...nel.org> writes:
> 
> > On Mon, Dec 4, 2023 at 3:39 AM Javier Martinez Canillas
> > <javierm@...hat.com> wrote:
> >> Rob Herring <robh@...nel.org> writes:
> >> > On Fri, Dec 1, 2023 at 4:21 AM Javier Martinez Canillas
> 
> [...]
> 
> >>
> >> > However, there might be one other issue with that and this fix. The DT
> >> > simplefb can have resources such as clocks and regulators. With
> >> > fw_devlink, the driver won't probe until those dependencies are met.
> >> > So if you want the framebuffer console up early, then you may want to
> >> > register the EFI framebuffer first and then handoff to the DT simplefb
> >> > when it probes (rather than registering the device).
> >> >
> >> > But I agree, probably better to take this patch now and have those
> >> > quirks instead of flat out not working.
> >> >
> >>
> >> If we do that what's the plan? Are you thinking about merging this patch
> >> through your OF tree or do you want to go through drm-misc with your ack?
> >
> > I can take it. Do we need this in 6.7 and stable?
> >
> 
> IMO this can wait for v6.8 since is not a fix for a change introduced in
> the v6.7 merge window and something that only happens on a very specific
> setup (DT systems booting with u-boot EFI and providing an EFI-GOP table).
> 
> Also the -rc cycle is already in -rc5, so it seems risky to push a change
> at this point. And distros can pick the patch if want to have it earlier.

Okay, I've applied it for 6.8.

Rob