linux-kernel - Re: [PATCH v2 3/6] clk: sunxi-ng: nkm: Support minimum and maximum rate

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Date: Thu, 22 Feb 2024 11:28:02 +0100
From: Maxime Ripard <mripard@...nel.org>
To: Frank Oltmanns <frank@...manns.dev>
Cc: Jernej Skrabec <jernej.skrabec@...il.com>, 
	Diego Roversi <diegor@...cali.it>, Michael Turquette <mturquette@...libre.com>, 
	Stephen Boyd <sboyd@...nel.org>, Chen-Yu Tsai <wens@...e.org>, 
	Samuel Holland <samuel@...lland.org>, Guido Günther <agx@...xcpu.org>, 
	Purism Kernel Team <kernel@...i.sm>, Ondrej Jirman <megi@....cz>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Jessica Zhang <quic_jesszhan@...cinc.com>, 
	Sam Ravnborg <sam@...nborg.org>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
	Daniel Vetter <daniel@...ll.ch>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, linux-clk@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 3/6] clk: sunxi-ng: nkm: Support minimum and maximum
 rate

On Wed, Feb 21, 2024 at 11:38:39AM +0100, Frank Oltmanns wrote:
> Hi Jernej,
> hi Maxime,
> 
> On 2024-02-05 at 16:22:26 +0100, Frank Oltmanns <frank@...manns.dev> wrote:
> > 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.
> 
> 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].
> 
> 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#procedure-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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