linux-kernel - RE: [PATCH V5 1/1] clk: imx8mp: Alias M7 SRC/DIV to M7 CORE

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Date:   Mon, 30 Jan 2023 07:44:22 +0000
From:   LI Qingwu <qing-wu.li@...ca-geosystems.com.cn>
To:     Abel Vesa <abel.vesa@...aro.org>, Stephen Boyd <sboyd@...nel.org>,
        Peng Fan <peng.fan@....com>
CC:     "abelvesa@...nel.org" <abelvesa@...nel.org>,
        "mturquette@...libre.com" <mturquette@...libre.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "linux-imx@....com" <linux-imx@....com>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "18701859600@....com" <18701859600@....com>,
        GEO-CHHER-bsp-development 
        <bsp-development.geo@...ca-geosystems.com>,
        Marco Felsch <m.felsch@...gutronix.de>
Subject: RE: [PATCH V5 1/1] clk: imx8mp: Alias M7 SRC/DIV to M7 CORE



> -----Original Message-----
> From: Abel Vesa <abel.vesa@...aro.org>
> Sent: Sunday, January 29, 2023 2:39 AM
> To: Stephen Boyd <sboyd@...nel.org>; LI Qingwu
> <Qing-wu.Li@...ca-geosystems.com.cn>; Peng Fan <peng.fan@....com>
> Cc: LI Qingwu <Qing-wu.Li@...ca-geosystems.com.cn>; abelvesa@...nel.org;
> mturquette@...libre.com; shawnguo@...nel.org; s.hauer@...gutronix.de;
> kernel@...gutronix.de; festevam@...il.com; linux-imx@....com;
> linux-clk@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> linux-kernel@...r.kernel.org; 18701859600@....com;
> GEO-CHHER-bsp-development <bsp-development.geo@...ca-geosystems.com>;
> Marco Felsch <m.felsch@...gutronix.de>
> Subject: Re: [PATCH V5 1/1] clk: imx8mp: Alias M7 SRC/DIV to M7 CORE
> 
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> 
> On 23-01-18 11:00:36, Stephen Boyd wrote:
> > Quoting Abel Vesa (2023-01-16 06:28:33)
> > > On 23-01-11 11:10:30, LI Qingwu wrote:
> > > > Defined IMX8MP_CLK_M7_SRC and IMX8MP_CLK_M7_DIV in
> imx8mp-clock.h
> > > > but never assigned. It will cause the system to hang if using them.
> > > > Alias IMX8MP_CLK_M7_SRC and IMX8MP_CLK_M7_DIV to
> > > > IMX8MP_CLK_M7_CORE for backward compatibility.
> > > >
> > > > Fixes: 8c83a8ff4dd9 (clk: imx8mp: use imx8m_clk_hw_composite_core
> > > > to simplify code)
> > > > Reviewed-by: Marco Felsch <m.felsch@...gutronix.de>
> > > > Reviewed-by: Abel Vesa <abel.vesa@...aro.org>
> > > > Signed-off-by: LI Qingwu <Qing-wu.Li@...ca-geosystems.com.cn>
> > >
> > > Stephen, can you please pick this up yourself?
> > >
> >
> > Is it needed for clk-fixes? When did the system start hanging?
> 
> Li, Peng, can you provide some details here?

Since IMX8MP_CLK_M7_SRC and IMX8MP_CLK_M7_DIV were not assigned,
if using any one of them in device tree, Linux system hanging after start M7 core.