netdev - Re: [PATCH 2/2] ptp: Add a ptp clock driver for IDT ClockMatrix.

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Date:   Thu, 19 Sep 2019 20:24:33 +0000
From:   Vincent Cheng <vincent.cheng.xh@...esas.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "richardcochran@...il.com" <richardcochran@...il.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] ptp: Add a ptp clock driver for IDT ClockMatrix.

Hi Andrew,

On Wed, Sep 18, 2019 at 05:18:03PM EDT, Andrew Lunn wrote:
>On Wed, Sep 18, 2019 at 04:06:38PM -0400, vincent.cheng.xh@...esas.com wrote:
>
>> +static s32 idtcm_xfer(struct idtcm *idtcm,
>> +		      u8 regaddr,
>> +		      u8 *buf,
>> +		      u16 count,
>> +		      bool write)
>> +{
>> +	struct i2c_client *client = idtcm->client;
>> +	struct i2c_msg msg[2];
>> +	s32 cnt;
>> +
>> +	msg[0].addr = client->addr;
>> +	msg[0].flags = 0;
>> +	msg[0].len = 1;
>> +	msg[0].buf = &regaddr;
>> +
>> +	msg[1].addr = client->addr;
>> +	msg[1].flags = write ? 0 : I2C_M_RD;
>> +	msg[1].len = count;
>> +	msg[1].buf = buf;
>> +
>> +	cnt = i2c_transfer(client->adapter, msg, 2);
>> +
>> +	if (cnt < 0) {
>> +		pr_err("i2c_transfer returned %d\n", cnt);
>
>dev_err(client->dev, "i2c_transfer returned %d\n", cnt);
>
>We then have an idea which device has a transfer error.
>
>Please try to not use pr_err() when you have some sort of device.

Sure thing, will replace pr_err() with dev_err().

>> +static s32 idtcm_state_machine_reset(struct idtcm *idtcm)
>> +{
>> +	s32 err;
>> +	u8 byte = SM_RESET_CMD;
>> +
>> +	err = idtcm_write(idtcm, RESET_CTRL, SM_RESET, &byte, sizeof(byte));
>> +
>> +	if (!err) {
>> +		/* delay */
>> +		set_current_state(TASK_INTERRUPTIBLE);
>> +		schedule_timeout(_msecs_to_jiffies(POST_SM_RESET_DELAY_MS));
>
>Maybe use msleep_interruptable()? 

Yes, will try using msleep_interruptable() and will replace if it works.

>> +static s32 idtcm_load_firmware(struct idtcm *idtcm,
>> +			       struct device *dev)
>> +{
>> +	const struct firmware *fw;
>> +	struct idtcm_fwrc *rec;
>> +	u32 regaddr;
>> +	s32 err;
>> +	s32 len;
>> +	u8 val;
>> +	u8 loaddr;
>> +
>> +	pr_info("requesting firmware '%s'\n", FW_FILENAME);
>
>dev_debug()

Thanks, will make the change.

>> +
>> +	err = request_firmware(&fw, FW_FILENAME, dev);
>> +
>> +	if (err)
>> +		return err;
>> +
>> +	pr_info("firmware size %zu bytes\n", fw->size);
>
>dev_debug()
>
>Maybe look through all your pr_info and downgrade most of them to
>dev_debug()

Yes, will go through and downgrade to dev_debug() accordingly.

Thanks,
Vincent