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Date: Thu, 22 Feb 2024 11:28:02 +0100
From: Maxime Ripard <mripard@kernel.org>
To: Frank Oltmanns <frank@oltmanns.dev>
Cc: Jernej Skrabec <jernej.skrabec@gmail.com>, 
	Diego Roversi <diegor@tiscali.it>, Michael Turquette <mturquette@baylibre.com>, 
	Stephen Boyd <sboyd@kernel.org>, Chen-Yu Tsai <wens@csie.org>, 
	Samuel Holland <samuel@sholland.org>, Guido =?utf-8?Q?G=C3=BCnther?= <agx@sigxcpu.org>, 
	Purism Kernel Team <kernel@puri.sm>, Ondrej Jirman <megi@xff.cz>, 
	Neil Armstrong <neil.armstrong@linaro.org>, Jessica Zhang <quic_jesszhan@quicinc.com>, 
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	Daniel Vetter <daniel@ffwll.ch>, Rob Herring <robh+dt@kernel.org>, 
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Subject: Re: [PATCH v2 3/6] clk: sunxi-ng: nkm: Support minimum and maximum
 rate
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References: <20240205-pinephone-pll-fixes-v2-0-96a46a2d8c9b@oltmanns.dev>
 <20240205-pinephone-pll-fixes-v2-3-96a46a2d8c9b@oltmanns.dev>
 <8734tmhzkg.fsf@oltmanns.dev>
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On Wed, Feb 21, 2024 at 11:38:39AM +0100, Frank Oltmanns wrote:
> Hi Jernej,
> hi Maxime,
>=20
> On 2024-02-05 at 16:22:26 +0100, Frank Oltmanns <frank@oltmanns.dev> wrot=
e:
> > According to the Allwinner User Manual, the Allwinner A64 requires
> > PLL-MIPI to run at 500MHz-1.4GHz. Add support for that to ccu_nkm.
>=20
> I should point out that limiting PLL-MIPI also fixes a regression
> that was introduced in 6.5, specifically
> ca1170b69968233b34d26432245eddf7d265186b "clk: sunxi-ng: a64: force
> select PLL_MIPI in TCON0 mux". This has been bisected and reported by
> Diego [1].
>=20
> I don't know the procedure (yet), but probably the fix (if and when
> accepted) should be backported at least to 6.6 (first broken LTS), 6.7
> (stable), and 6.8 (next stable).

https://www.kernel.org/doc/html/next/process/stable-kernel-rules.html#proce=
dure-for-submitting-patches-to-the-stable-tree

> My suggestion:
>  - In V3 of this series, I will reorder the patches, so that what is now
>    PATCH 3 and 4 becomes 1 and 2 respectively, so that they can be
>    applied to 6.6 more easily.
>  - Maxime, IIUC you requested some refactoring for handling the rate
>    limits [2]. I propose, we use my current proposal as-is, and I will
>    do a follow-up series for the refactoring.

I'd really like to not introduce a new ad-hoc implementation of range
handling. It's fine for older users to not be converted yet, but we
shouldn't introduce more users.

Maxime

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