linux-kernel - Re: [PATCH] clk: imx: lpcg: write twice when writing lpcg regs

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Message-Id: <20190906172044.B99FB20838@mail.kernel.org>
Date:   Fri, 06 Sep 2019 10:20:43 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     "festevam@...il.com" <festevam@...il.com>,
        "mturquette@...libre.com" <mturquette@...libre.com>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        Aisheng Dong <aisheng.dong@....com>,
        Peng Fan <peng.fan@....com>
Cc:     "kernel@...gutronix.de" <kernel@...gutronix.de>,
        dl-linux-imx <linux-imx@....com>,
        Anson Huang <anson.huang@....com>,
        Jacky Bai <ping.bai@....com>, Abel Vesa <abel.vesa@....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>,
        Peng Fan <peng.fan@....com>
Subject: Re: [PATCH] clk: imx: lpcg: write twice when writing lpcg regs

Quoting Peng Fan (2019-08-27 01:17:50)
> From: Peng Fan <peng.fan@....com>
> 
> There is hardware issue that:
> The output clock the LPCG cell will not turn back on as expected,
> even though a read of the IPG registers in the LPCG indicates that
> the clock should be enabled.
> 
> The software workaround is to write twice to enable the LPCG clock
> output.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>

Does this need a Fixes tag?