linux-kernel - RE: [PATCH v10 5/6] usb:cdns3 Add Cadence USB3 DRD Driver

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Date:   Fri, 23 Aug 2019 09:39:58 +0000
From:   Pawel Laszczak <pawell@...ence.com>
To:     Vignesh Raghavendra <vigneshr@...com>,
        "felipe.balbi@...ux.intel.com" <felipe.balbi@...ux.intel.com>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "rogerq@...com" <rogerq@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jbergsagel@...com" <jbergsagel@...com>,
        "nsekhar@...com" <nsekhar@...com>, "nm@...com" <nm@...com>,
        Suresh Punnoose <sureshp@...ence.com>,
        Jayshri Dajiram Pawar <jpawar@...ence.com>,
        Rahul Kumar <kurahul@...ence.com>,
        Anil Joy Varughese <aniljoy@...ence.com>
Subject: RE: [PATCH v10 5/6] usb:cdns3 Add Cadence USB3 DRD Driver

Hi,

>Hi,
>
>On 22/07/19 12:02 AM, Pawel Laszczak wrote:
>> +
>> +/**
>> + * cdns3_req_ep0_get_status - Handling of GET_STATUS standard USB request
>> + * @priv_dev: extended gadget object
>> + * @ctrl_req: pointer to received setup packet
>> + *
>> + * Returns 0 if success, error code on error
>> + */
>> +static int cdns3_req_ep0_get_status(struct cdns3_device *priv_dev,
>> +				    struct usb_ctrlrequest *ctrl)
>> +{
>> +	__le16 *response_pkt;
>> +	u16 usb_status = 0;
>> +	u32 recip;
>> +	u32 reg;
>> +
>> +	recip = ctrl->bRequestType & USB_RECIP_MASK;
>> +
>> +	switch (recip) {
>> +	case USB_RECIP_DEVICE:
>> +		/* self powered */
>> +		if (priv_dev->is_selfpowered)
>> +			usb_status = BIT(USB_DEVICE_SELF_POWERED);
>> +
>> +		if (priv_dev->wake_up_flag)
>> +			usb_status |= BIT(USB_DEVICE_REMOTE_WAKEUP);
>> +
>> +		if (priv_dev->gadget.speed != USB_SPEED_SUPER)
>> +			break;
>> +
>> +		reg = readl(&priv_dev->regs->usb_sts);
>
>I see usb_sts is read, but never used in this function?

It's true, it's not used. 

Thanks.

>
>> +
>> +		if (priv_dev->u1_allowed)
>> +			usb_status |= BIT(USB_DEV_STAT_U1_ENABLED);
>> +
>> +		if (priv_dev->u2_allowed)
>> +			usb_status |= BIT(USB_DEV_STAT_U2_ENABLED);
>> +
>> +		break;
>> +	case USB_RECIP_INTERFACE:
>> +		return cdns3_ep0_delegate_req(priv_dev, ctrl);
>> +	case USB_RECIP_ENDPOINT:
>> +		/* check if endpoint is stalled */
>> +		cdns3_select_ep(priv_dev, ctrl->wIndex);
>> +		if (EP_STS_STALL(readl(&priv_dev->regs->ep_sts)))
>> +			usb_status =  BIT(USB_ENDPOINT_HALT);
>> +		break;
>> +	default:
>> +		return -EINVAL;
>> +	}
>> +
>> +	response_pkt = (__le16 *)priv_dev->setup_buf;
>> +	*response_pkt = cpu_to_le16(usb_status);
>> +
>> +	cdns3_ep0_run_transfer(priv_dev, priv_dev->setup_dma,
>> +			       sizeof(*response_pkt), 1, 0);
>> +	return 0;
>> +}
>> +
>
--
Cheers
Pawell