linux-kernel - Re: [PATCH v3 1/5] clk: Respect CLK_OPS_PARENT

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Message-ID: <4ea31b0d-af6e-44f7-86e4-35a43b8c71e7@sirena.org.uk>
Date: Tue, 27 Jan 2026 17:25:04 +0000
From: Mark Brown <broonie@...nel.org>
To: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Dong Aisheng <aisheng.dong@....com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Yassine Oudjana <y.oudjana@...tonmail.com>,
	Laura Nao <laura.nao@...labora.com>,
	Nícolas F. R. A. Prado <nfraprado@...labora.com>,
	Chia-I Wu <olvaffe@...il.com>, Chen-Yu Tsai <wenst@...omium.org>,
	kernel@...labora.com, linux-clk@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v3 1/5] clk: Respect CLK_OPS_PARENT_ENABLE during recalc

On Tue, Jan 27, 2026 at 05:01:35PM +0000, Mark Brown wrote:
> On Fri, Oct 10, 2025 at 10:47:09PM +0200, Nicolas Frattaroli wrote:
> > When CLK_OPS_PARENT_ENABLE was introduced, it guarded various clock
> > operations, such as setting the rate or switching parents. However,
> > another operation that can and often does touch actual hardware state is
> > recalc_rate, which may also be affected by such a dependency.
> 
> I'm seeing boot regressions in -next on the Avenger96 which bisect to
> this patch in -next.  The board resets during startup:

I am also seeing some similar regressions even earlier on i.MX8MP
platforms, though they're resetting even earlier before any output is
produced (even with earlycon).  Didn't confirm yet with a revert or
anything though.

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