linux-kernel - RE: [PATCH] clk: imx6sl: ensure MMDC CH0 handshake is bypassed

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Message-ID: <154356542041.88331.1938476424482018533@swboyd.mtv.corp.google.com>
Date:   Fri, 30 Nov 2018 00:10:20 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mturquette@...libre.com" <mturquette@...libre.com>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        Anson Huang <anson.huang@....com>,
        Fabio Estevam <fabio.estevam@....com>
Cc:     dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH] clk: imx6sl: ensure MMDC CH0 handshake is bypassed

Quoting Anson Huang (2018-11-29 23:37:14)
> Hi, Stephen
> 
> Best Regards!
> Anson Huang
> 
> > -----Original Message-----
> > From: Stephen Boyd [mailto:sboyd@...nel.org]
> > Sent: 2018年11月30日 15:25
> > To: kernel@...gutronix.de; linux-arm-kernel@...ts.infradead.org;
> > linux-clk@...r.kernel.org; linux-kernel@...r.kernel.org;
> > mturquette@...libre.com; s.hauer@...gutronix.de; shawnguo@...nel.org;
> > Anson Huang <anson.huang@....com>; Fabio Estevam
> > <fabio.estevam@....com>
> > Cc: dl-linux-imx <linux-imx@....com>
> > Subject: Re: [PATCH] clk: imx6sl: ensure MMDC CH0 handshake is bypassed
> > 
> > Quoting Anson Huang (2018-11-29 23:23:47)
> > > Same as other i.MX6 SoCs, ensure unused MMDC channel's handshake is
> > > bypassed, this is to make sure no request signal will be generated
> > > when periphe_clk_sel is changed or SRC warm reset is triggered.
> > >
> > > Signed-off-by: Anson Huang <Anson.Huang@....com>
> > 
> > Does this need a fixes tag?
> 
> Normally this bit is 1b'1 by reset, but during our development, it used to be
> overwritten in u-boot and lead to some clock operation fail in Linux kernel, that is why we ensure it
> in clock driver early phase. IMO, it should be OK to not add a fix tag, since it is just
> to make sure the setting is correct and NOT depends on the hardware reset value which
> could be changed in u-boot.
> 
> 

Hmm ok.