linux-kernel - RE: [PATCH 05/11] i2c: imx-lpi2c: add debug message when i2c peripheral clk doesn't work

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Message-ID: <AM6PR04MB4966E686EEE0FE022996B26880689@AM6PR04MB4966.eurprd04.prod.outlook.com>
Date:   Fri, 19 Mar 2021 04:56:47 +0000
From:   Aisheng Dong <aisheng.dong@....com>
To:     Clark Wang <xiaoning.wang@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
CC:     "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "sumit.semwal@...aro.org" <sumit.semwal@...aro.org>,
        "christian.koenig@....com" <christian.koenig@....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: [PATCH 05/11] i2c: imx-lpi2c: add debug message when i2c
 peripheral clk doesn't work

> From: Clark Wang <xiaoning.wang@....com>
> Sent: Wednesday, March 17, 2021 2:54 PM
> 
> add debug message when i2c peripheral clk rate is 0, then directly return
> -EINVAL.
> 
> Signed-off-by: Gao Pan <pandy.gao@....com>
> Reviewed-by: Andy Duan <fugang.duan@....com>

Drop old review when patch is changed

> ---
>  drivers/i2c/busses/i2c-imx-lpi2c.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c
> b/drivers/i2c/busses/i2c-imx-lpi2c.c
> index e718bb6b2387..8f9dd3dd2951 100644
> --- a/drivers/i2c/busses/i2c-imx-lpi2c.c
> +++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
> @@ -209,7 +209,12 @@ static int lpi2c_imx_config(struct lpi2c_imx_struct
> *lpi2c_imx)
> 
>  	lpi2c_imx_set_mode(lpi2c_imx);
> 
> -	clk_rate = clk_get_rate(lpi2c_imx->clk);

I guess the kernel can't compile right before this patch because lpi2c_imx->clk was
Removed In former patch
You need double check not break bisect

> +	clk_rate = clk_get_rate(lpi2c_imx->clk_per);
> +	if (!clk_rate) {
> +		dev_dbg(&lpi2c_imx->adapter.dev, "clk_per rate is 0\n");

s/dev_dbg/dev_err

> +		return -EINVAL;
> +	}
> +
>  	if (lpi2c_imx->mode == HS || lpi2c_imx->mode == ULTRA_FAST)
>  		filt = 0;
>  	else
> --
> 2.25.1