linux-kernel - Re: [PATCH 2/8] i2c: sprd: Add I2C driver to use 'reset framework' function

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Message-ID: <20230902203052.ecoly4r67i5qbxu3@zenone.zhora.eu>
Date:   Sat, 2 Sep 2023 22:30:52 +0200
From:   Andi Shyti <andi.shyti@...nel.org>
To:     Huangzheng Lai <Huangzheng.Lai@...soc.com>
Cc:     Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        huangzheng lai <laihuangzheng@...il.com>,
        Xiongpeng Wu <xiongpeng.wu@...soc.com>
Subject: Re: [PATCH 2/8] i2c: sprd: Add I2C driver to use 'reset framework'
 function

Hi Huangzheng,

On Thu, Aug 17, 2023 at 05:45:14PM +0800, Huangzheng Lai wrote:
> This patch adds the 'reset framework' function for I2C drivers, which
> resets the I2C controller when a timeout exception occurs.

as in the earlier patch, please use the imperative form.

> Signed-off-by: Huangzheng Lai <Huangzheng.Lai@...soc.com>

[...]

> @@ -247,6 +249,7 @@ static int sprd_i2c_handle_msg(struct i2c_adapter *i2c_adap,
>  {
>  	struct sprd_i2c *i2c_dev = i2c_adap->algo_data;
>  	unsigned long time_left;
> +	int ret;

please move this declaration...

>  
>  	i2c_dev->msg = msg;
>  	i2c_dev->buf = msg->buf;
> @@ -278,9 +281,16 @@ static int sprd_i2c_handle_msg(struct i2c_adapter *i2c_adap,
>  
>  	time_left = wait_for_completion_timeout(&i2c_dev->complete,
>  				msecs_to_jiffies(I2C_XFER_TIMEOUT));
> -	if (!time_left)
> +	if (!time_left) {
> +		dev_err(i2c_dev->dev, "transfer timeout, I2C_STATUS = 0x%x\n",
> +			readl(i2c_dev->base + I2C_STATUS));
> +		if (i2c_dev->rst != NULL) {

... here.

> +			ret = reset_control_reset(i2c_dev->rst);
> +			if (ret < 0)
> +				dev_err(i2c_dev->dev, "i2c soft reset failed, ret = %d\n", ret);

dev_warn()

> +		}
>  		return -ETIMEDOUT;
> -
> +	}
>  	return i2c_dev->err;
>  }
>  
> @@ -535,6 +545,11 @@ static int sprd_i2c_probe(struct platform_device *pdev)
>  		return ret;
>  
>  	platform_set_drvdata(pdev, i2c_dev);
> +	i2c_dev->rst = devm_reset_control_get(i2c_dev->dev, "i2c_rst");
> +	if (IS_ERR(i2c_dev->rst)) {
> +		dev_err(i2c_dev->dev, "can't get i2c reset node\n");

if the i2c_rst is optional then this is not an error and it
should use dev_dbg(); right?

In that case please reword the message to "reset control not
configured".

Andi