linux-kernel - Re: [PATCH RFC 0/3] Add splash DRM client

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Message-ID: <23clcxtgbzbsji2knwp47xdc5udj7lnhbvzsgqi3vklvmhdgjd@26ycx2ed77l4>
Date: Mon, 27 Oct 2025 18:19:12 +0100
From: Maxime Ripard <mripard@...nel.org>
To: Mario Limonciello <mario.limonciello@....com>
Cc: Thomas Zimmermann <tzimmermann@...e.de>, 
	Francesco Valla <francesco@...la.it>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
	Jonathan Corbet <corbet@....net>, Jocelyn Falempe <jfalempe@...hat.com>, 
	Javier Martinez Canillas <javierm@...hat.com>, Sam Ravnborg <sam@...nborg.org>, linux-kernel@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, linux-doc@...r.kernel.org, linux-embedded@...r.kernel.org
Subject: Re: [PATCH RFC 0/3] Add splash DRM client

On Mon, Oct 27, 2025 at 11:31:06AM -0500, Mario Limonciello wrote:
> On 10/27/25 11:28 AM, Maxime Ripard wrote:
> > On Mon, Oct 27, 2025 at 11:01:55AM -0500, Mario Limonciello wrote:
> > > On 10/27/25 7:35 AM, Thomas Zimmermann wrote:
> > > > > >     - a very simple progress bar, which can be driven through sysfs;
> > > > 
> > > > Once you have options to control these settings from user space, you
> > > > should do it in user space entirely. As Maxime suggested, please improve
> > > > plymouth for anything with animation.
> > > > 
> > > > > >     - a static image (optional).
> > > > 
> > > > Board vendors often provide an image, see /sys/firmware/acpi/bgrt/. This
> > > > is a candidate for display, or the penguin or a custom image. Please
> > > > make it configurable by Kconfig. Again, if you need policy and
> > > > heuristics for deciding what to display, you better do this in user
> > > > space.
> > > 
> > > I'd actually argue that the static image from BGRT should be the preferred
> > > priority.  This can make for a nice hand off to Plymouth.
> > > 
> > > The (UEFI) BIOS already will show this image as soon as the GOP driver is
> > > loaded.  Bootloaders like GRUB by default will avoid showing anything or
> > > will overwrite with the exact same image in the same location.  This can let
> > > the kernel do the same, and then the moment Plymouth takes over it could do
> > > the same.
> > 
> > And BGRT isn't typically found on embedded systems at all, so I'm not
> > sure it's a sensible default, let alone a priority. At most a possible
> 
> There are certainly embedded machines using UEFI and that have a BGRT.

Yes, indeed, hence the "typically".

> How about "Sensible default the top of the priority list if it exists"

How about we don't tell contributors what their priorities must be?

Maxime

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