linux-kernel - Re: [PATCH] clk: sunxi-ng: h6: Reparent CPUX during PLL CPUX rate change

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Message-ID: <CAGb2v651T28yrkaAbX3ckV8gEsYXdGgHMgCb3Jdmbej2OnNyLQ@mail.gmail.com>
Date: Sat, 2 Mar 2024 19:42:11 +0800
From: Chen-Yu Tsai <wens@...e.org>
To: Jernej Skrabec <jernej.skrabec@...il.com>
Cc: samuel@...lland.org, sboyd@...nel.org, linux-clk@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev, 
	linux-kernel@...r.kernel.org, Chad Wagner <wagnerch42@...il.com>
Subject: Re: [PATCH] clk: sunxi-ng: h6: Reparent CPUX during PLL CPUX rate change

On Sat, Oct 14, 2023 at 2:17 AM Jernej Skrabec <jernej.skrabec@...il.com> wrote:
>
> While PLL CPUX clock rate change when CPU is running from it works in
> vast majority of cases, now and then it causes instability. This leads
> to system crashes and other undefined behaviour. After a lot of testing
> (30+ hours) while also doing a lot of frequency switches, we can't
> observe any instability issues anymore when doing reparenting to stable
> clock like 24 MHz oscillator.
>
> Fixes: 524353ea480b ("clk: sunxi-ng: add support for the Allwinner H6 CCU")
> Reported-by: Chad Wagner <wagnerch42@...il.com>
> Link: https://forum.libreelec.tv/thread/27295-orange-pi-3-lts-freezes/
> Tested-by: Chad Wagner <wagnerch42@...il.com>
> Signed-off-by: Jernej Skrabec <jernej.skrabec@...il.com>

Reviewed-by: Chen-Yu Tsai <wens@...e.org>