linux-kernel - Re: [PATCH] drm/rockchip: cdn-dp: Remove redundant workarounds for firmware loading

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Message-ID: <20240711-therapeutic-space-bonobo-b4fed8@houat>
Date: Thu, 11 Jul 2024 12:51:38 +0200
From: Maxime Ripard <mripard@...nel.org>
To: Dragan Simic <dsimic@...jaro.org>
Cc: Andy Yan <andyshrk@....com>, linux-rockchip@...ts.infradead.org, 
	dri-devel@...ts.freedesktop.org, heiko@...ech.de, hjc@...k-chips.com, andy.yan@...k-chips.com, 
	maarten.lankhorst@...ux.intel.com, tzimmermann@...e.de, airlied@...il.com, daniel@...ll.ch, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, javierm@...hat.com
Subject: Re: [PATCH] drm/rockchip: cdn-dp: Remove redundant workarounds for
 firmware loading

On Wed, Jul 10, 2024 at 04:22:12PM GMT, Dragan Simic wrote:
> Hello Maxime,
> 
> On 2024-07-10 09:13, Maxime Ripard wrote:
> > On Tue, Jul 09, 2024 at 06:36:08PM GMT, Dragan Simic wrote:
> > > > > > > As I already wrote earlier, and as the above-linked discussions
> > > > > > > conclude, solving these issues doesn't belong to any specific driver.
> > > > > > > It should be resolved within the kernel's firmware loading mechanism
> > > > > > > instead, and no driver should be specific in that regard.
> > > > > >
> > > > > > IT would be good if it can be resolved within the kernel's  firmware
> > > > > > loading mechanism.
> > > > >
> > > > > ... we'll need this as a systemic solution.
> > > >
> > > > The general policy has been to put drivers that need a firmware as a
> > > > module, and just never build them statically.
> > > 
> > > I totally agree, but if Buildroot builds them statically and provides
> > > no initial ramdisk, we need a better solution than having various
> > > drivers
> > > attempt to implement their own workarounds.
> > 
> > Buildroot typically allows custom kernel configurations, so it's not
> > really "enforcing" anything like another distro does.
> > 
> > It is definitely targetted towards very stripped down systems, so I
> > guess building the drivers statically is a natural choice, but it works
> > fine with modules too.
> 
> It all leads to a conclusion that we need better in-kernel support
> for delayed firmware loading, instead of drivers implementing various
> workarounds, for the layouts in which drivers are built statically
> into the kernel image, but the required firmware blobs reside on the
> root filesystem.
> 
> I'll start working on it, hopefully today. :)

I don't want to prevent you from trying, but be aware that similar
attempts have been shut down repeatedly in the past.

Maxime

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