linux-kernel - Re: [PATCH 10/18] clk: imx: Remove CLK_SET_PARENT

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Date: Sat, 4 May 2024 14:01:24 +0200
From: Francesco Dolcini <francesco@...cini.it>
To: "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc: Abel Vesa <abelvesa@...nel.org>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, Jacky Bai <ping.bai@....com>,
	Ye Li <ye.li@....com>, Dong Aisheng <aisheng.dong@....com>,
	linux-clk@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Abel Vesa <abel.vesa@...aro.org>, Peng Fan <peng.fan@....com>
Subject: Re: [PATCH 10/18] clk: imx: Remove CLK_SET_PARENT_GATE for DRAM mux
 for i.MX7D

Hello Peng,

On Sat, May 04, 2024 at 08:49:03AM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
> 
> For i.MX7D DRAM related mux clock, the clock source change should ONLY
> be done done in low level asm code without accessing DRAM, and then
> calling clk API to sync the HW clock status with clk tree, it should never
> touch real clock source switch via clk API, so CLK_SET_PARENT_GATE flag
> should NOT be added, otherwise, DRAM's clock parent will be disabled when
> DRAM is active, and system will hang.

>From the description this is solving a system hang, but no fixes tag nor
cc stable.

Francesco