linux-kernel - Re: [PATCH v3 2/2] usb: phy: Add USB3 PHY support for Intel LGM SoC

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Message-ID: <530dc44b-59d7-7ecd-4ec9-fd13f5f0e129@linux.intel.com>
Date:   Wed, 17 Jun 2020 08:10:55 +0800
From:   "Ramuthevar, Vadivel MuruganX" 
        <vadivel.muruganx.ramuthevar@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...el.com>
Cc:     linux-kernel@...r.kernel.org, balbi@...nel.org, robh@...nel.org,
        p.zabel@...gutronix.de, gregkh@...uxfoundation.org,
        devicetree@...r.kernel.org, linux-usb@...r.kernel.org,
        cheol.yong.kim@...el.com, qi-ming.wu@...el.com, yin1.li@...el.com
Subject: Re: [PATCH v3 2/2] usb: phy: Add USB3 PHY support for Intel LGM SoC

Hi Andy,

Thank you very much for the review comments and your time...

On 12/6/2020 9:18 pm, Andy Shevchenko wrote:
> On Fri, Jun 12, 2020 at 10:59:41AM +0800, Ramuthevar,Vadivel MuruganX wrote:
>> From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
>>
>> Add support for USB PHY on Intel LGM SoC.
> 
> Thank you for an update, looks pretty much good, my comments below.
Sure, will update.
> 
> ...
> 
>> +static int get_flipped(struct tca_apb *ta, bool *flipped)
>> +{
>> +	union extcon_property_value property;
>> +	int ret;
>> +
>> +	ret = extcon_get_property(ta->phy.edev, EXTCON_USB_HOST,
>> +				  EXTCON_PROP_USB_TYPEC_POLARITY, &property);
>> +	if (ret) {
> 
>> +		dev_err(ta->phy.dev, "no polarity property from extcon\n");
> 
> (1)
Noted.
> 
>> +		return ret;
>> +	}
>> +
>> +	*flipped = property.intval;
>> +
>> +	return ret;
>> +}
> 
> ...
> 
>> +	ret = get_flipped(ta, &flipped);
>> +	if (ret)
>> +		dev_err(ta->phy.dev, "no polarity property from extcon\n");
> 
> You already has a message in (1). You should decide which one to leave.
> 
> But note, if it's a fatal error, you have to return here, otherwise, if you
> decide to leave message here, it should be not on error level.
Agreed!, let double and update as per your suggestion if it is fatal error.
> 
>> +	connected = extcon_get_state(ta->phy.edev, EXTCON_USB_HOST);
>> +	if (connected == ta->connected)
>> +		return;
>> +
>> +	ta->connected = connected;
>> +	if (connected) {
>> +		val = TCPC_VALID | FIELD_PREP(TCPC_MUX_CTL, MUX_USB);
>> +		if (flipped)
>> +			val |= TCPC_FLIPPED;
>> +		dev_info(ta->phy.dev, "connected%s\n", flipped ? " flipped" : "");
>> +	} else {
>> +		val = TCPC_DISCONN;
>> +		dev_info(ta->phy.dev, "disconnected\n");
>> +	}
>> +
>> +	writel(val, ta->phy.io_priv + TCPC_OFFSET);
>> +
> 
>> +	if (ta->phy.set_vbus(&ta->phy, connected))
>> +		dev_err(ta->phy.dev, "failed to set VBUS\n");
> 
> Please, split it to
> 	ret = ...;
Noted, will update.
> 	if (ret)
> 
>> +}
> 
> ...
> 
>> +static int vbus_notifier(struct notifier_block *nb,
>> +			 unsigned long event, void *ptr)
> 
> Consider to put it on one line (you can also shrink the names of unused
> parameters.
Sure, will try to reduce the length of the variable names.

Regards
Vadivel
> 
>> +{
>> +	return NOTIFY_DONE;
>> +}
>