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Date: Mon, 4 Mar 2024 12:28:39 +0100
From: Maxime Ripard <mripard@kernel.org>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Randy Dunlap <rdunlap@infradead.org>, 
	Guenter Roeck <groeck@google.com>, Linus Torvalds <torvalds@linuxfoundation.org>, 
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Subject: Re: [PATCH 1/3] kci-gitlab: Introducing GitLab-CI Pipeline for
 Kernel Testing
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On Mon, Mar 04, 2024 at 12:12:47PM +0100, Geert Uytterhoeven wrote:
> Hi Maxime,
>=20
> On Mon, Mar 4, 2024 at 11:20=E2=80=AFAM Maxime Ripard <mripard@kernel.org=
> wrote:
> > On Mon, Mar 04, 2024 at 11:07:22AM +0100, Geert Uytterhoeven wrote:
> > > On Mon, Mar 4, 2024 at 10:15=E2=80=AFAM Maxime Ripard <mripard@kernel=
=2Eorg> wrote:
> > > > On Mon, Mar 04, 2024 at 09:12:38AM +0100, Geert Uytterhoeven wrote:
> > > > > On Sun, Mar 3, 2024 at 10:30=E2=80=AFAM Geert Uytterhoeven <geert=
@linux-m68k.org> wrote:
> > > > > ERROR: modpost: "__udivdi3" [drivers/gpu/drm/sun4i/sun4i-drm-hdmi=
=2Eko] 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 Cort=
ex-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.
>=20
> 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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