linux-kernel - Re: [PATCH 1/3] kci-gitlab: Introducing GitLab-CI Pipeline for Kernel Testing

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Date: Mon, 4 Mar 2024 12:28:39 +0100
From: Maxime Ripard <mripard@...nel.org>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Randy Dunlap <rdunlap@...radead.org>, 
	Guenter Roeck <groeck@...gle.com>, Linus Torvalds <torvalds@...uxfoundation.org>, 
	Nikolai Kondrashov <spbnick@...il.com>, Helen Koike <helen.koike@...labora.com>, linuxtv-ci@...uxtv.org, 
	dave.pigott@...labora.com, linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
	linux-kselftest@...r.kernel.org, gustavo.padovan@...labora.com, pawiecz@...labora.com, 
	tales.aparecida@...il.com, workflows@...r.kernel.org, kernelci@...ts.linux.dev, 
	skhan@...uxfoundation.org, kunit-dev@...glegroups.com, nfraprado@...labora.com, 
	davidgow@...gle.com, cocci@...ia.fr, Julia.Lawall@...ia.fr, laura.nao@...labora.com, 
	ricardo.canuelo@...labora.com, kernel@...labora.com, gregkh@...uxfoundation.org
Subject: Re: [PATCH 1/3] kci-gitlab: Introducing GitLab-CI Pipeline for
 Kernel Testing

On Mon, Mar 04, 2024 at 12:12:47PM +0100, Geert Uytterhoeven wrote:
> Hi Maxime,
> 
> On Mon, Mar 4, 2024 at 11:20 AM Maxime Ripard <mripard@...nel.org> wrote:
> > On Mon, Mar 04, 2024 at 11:07:22AM +0100, Geert Uytterhoeven wrote:
> > > On Mon, Mar 4, 2024 at 10:15 AM Maxime Ripard <mripard@...nel.org> wrote:
> > > > On Mon, Mar 04, 2024 at 09:12:38AM +0100, Geert Uytterhoeven wrote:
> > > > > On Sun, Mar 3, 2024 at 10:30 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > > > > ERROR: modpost: "__udivdi3" [drivers/gpu/drm/sun4i/sun4i-drm-hdmi.ko] undefined!
> > > > > make[3]: *** [scripts/Makefile.modpost:145: Module.symvers] Error 1
> > > > > make[2]: *** [Makefile:1871: modpost] Error 2
> > > > > make[1]: *** [Makefile:240: __sub-make] Error 2
> > > > > make: *** [Makefile:240: __sub-make] Error 2
> > > > >
> > > > > No warnings found in log.
> > > > > ------------------------------------------------------------------->8---
> > > >
> > > > The driver is meant for a controller featured in an SoC with a Cortex-A8
> > > > ARM CPU and less than a GiB/s memory bandwidth.
> > >
> > > Good, so the hardware cannot possibly need 64-bit pixel clock values ;-)
> >
> > This is an early patch to convert that function into a framework hook
> > implementation. HDMI 2.1 has a max TMDS character rate of slightly less
> > than 6GHz, so larger than 2^32 - 1.
> >
> > So yes, this driver doesn't need to. The framework does however.
> 
> That's gonna be interesting, as the Common Clock Framework does not
> support 64-bit clock rates on 32-bit platforms yet...

As far as KMS goes, it doesn't really matter. The TMDS character rate
doesn't need to be backed by a CCF clock.

And realistically speaking, I don't expect any 32 bit platform to
support HDMI 2.1.

Maxime

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