linux-kernel - Re: [PATCH 4/5] clk: Add flag to prevent frequency changes when walking subtrees

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Message-ID: <87jzbqtfc3.fsf@bootlin.com>
Date: Mon, 23 Dec 2024 19:38:20 +0100
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Stephen Boyd <sboyd@...nel.org>
Cc: Abel Vesa <abelvesa@...nel.org>,  Fabio Estevam <festevam@...il.com>,
  Marek Vasut <marex@...x.de>,  Michael Turquette
 <mturquette@...libre.com>,  Peng Fan <peng.fan@....com>,  Pengutronix
 Kernel Team <kernel@...gutronix.de>,  Sascha Hauer
 <s.hauer@...gutronix.de>,  Shawn Guo <shawnguo@...nel.org>,  Ying Liu
 <victor.liu@....com>,  Laurent Pinchart
 <laurent.pinchart@...asonboard.com>,  linux-clk@...r.kernel.org,
  imx@...ts.linux.dev,  linux-arm-kernel@...ts.infradead.org,
  linux-kernel@...r.kernel.org,  dri-devel@...ts.freedesktop.org,  Abel
 Vesa <abel.vesa@...aro.org>,  Herve Codina <herve.codina@...tlin.com>,
  Luca Ceresoli <luca.ceresoli@...tlin.com>,  Thomas Petazzoni
 <thomas.petazzoni@...tlin.com>,  Ian Ray <ian.ray@...com>
Subject: Re: [PATCH 4/5] clk: Add flag to prevent frequency changes when
 walking subtrees

Hi Stephen,

>> +/* do not passively change this clock rate during subtree rate propagation */
>> +#define CLK_NO_RATE_CHANGE_DURING_PROPAGATION BIT(14)
>
> Why doesn't rate locking work?

Can you be more specific? What function from the API is supposed to do
what I need? AFAIU, none of them is properly locking the rate during a
subtree walk, but if I misread one of them, I'd be glad to drop all this.

Thanks,
Miquèl