linux-kernel - RE: [EXT] Re: [PATCH] i2c: imx-lpi2c: add debug message when i2c peripheral clk doesn't work

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Message-ID: <VI1PR04MB5005DC14A78D364FABEF6E3EE802A@VI1PR04MB5005.eurprd04.prod.outlook.com>
Date:   Mon, 24 Jul 2023 10:19:48 +0000
From:   Carlos Song <carlos.song@....com>
To:     Andi Shyti <andi.shyti@...nel.org>
CC:     Aisheng Dong <aisheng.dong@....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>,
        Clark Wang <xiaoning.wang@....com>,
        Bough Chen <haibo.chen@....com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...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>
Subject: RE: [EXT] Re: [PATCH] i2c: imx-lpi2c: add debug message when i2c
 peripheral clk doesn't work

Hi, Andi

> -----Original Message-----
> From: Andi Shyti <andi.shyti@...nel.org>
> Sent: Wednesday, June 14, 2023 7:40 AM
> To: Carlos Song <carlos.song@....com>
> Cc: Aisheng Dong <aisheng.dong@....com>; shawnguo@...nel.org;
> s.hauer@...gutronix.de; kernel@...gutronix.de; festevam@...il.com; Clark
> Wang <xiaoning.wang@....com>; Bough Chen <haibo.chen@....com>;
> dl-linux-imx <linux-imx@....com>; linux-i2c@...r.kernel.org;
> linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org
> Subject: [EXT] Re: [PATCH] i2c: imx-lpi2c: add debug message when i2c
> peripheral clk doesn't work
> 
> Caution: This is an external email. Please take care when clicking links or
> opening attachments. When in doubt, report the message using the 'Report this
> email' button
> 
> 
> Hi,
> 
> On Mon, May 29, 2023 at 03:23:16PM +0800, carlos.song@....com wrote:
> > From: Gao Pan <pandy.gao@....com>
> >
> > Add debug message when i2c peripheral clk rate is 0, then directly
> > return -EINVAL.
> >
> > Fixes: a55fa9d0e42e ("i2c: imx-lpi2c: add low power i2c bus driver")
> > Signed-off-by: Gao Pan <pandy.gao@....com>
> > Signed-off-by: Carlos Song <carlos.song@....com>
> > ---
> >  drivers/i2c/busses/i2c-imx-lpi2c.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c
> > b/drivers/i2c/busses/i2c-imx-lpi2c.c
> > index 11240bf8e8e2..62111fe9f207 100644
> > --- a/drivers/i2c/busses/i2c-imx-lpi2c.c
> > +++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
> > @@ -209,6 +209,11 @@ static int lpi2c_imx_config(struct lpi2c_imx_struct
> *lpi2c_imx)
> >       lpi2c_imx_set_mode(lpi2c_imx);
> >
> >       clk_rate = clk_get_rate(lpi2c_imx->clks[0].clk);
> > +     if (!clk_rate) {
> > +             dev_dbg(&lpi2c_imx->adapter.dev, "clk_per rate is 0\n");
> > +             return -EINVAL;
> > +     }
> 
> should this rather be a dev_err?
> 
Carlos: Yes, I will fix it.
> And, BTW, did you actually hit this?
> 
Carlos: No, not frequently. But I think it will be safer maybe.
> Andi
> 
> > +
> >       if (lpi2c_imx->mode == HS || lpi2c_imx->mode == ULTRA_FAST)
> >               filt = 0;
> >       else
> > --
> > 2.34.1
> >