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

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Date:   Fri, 23 Aug 2019 14:23:55 +0530
From:   Vignesh Raghavendra <vigneshr@...com>
To:     Pawel Laszczak <pawell@...ence.com>, <felipe.balbi@...ux.intel.com>
CC:     <gregkh@...uxfoundation.org>, <linux-usb@...r.kernel.org>,
        <rogerq@...com>, <linux-kernel@...r.kernel.org>,
        <jbergsagel@...com>, <nsekhar@...com>, <nm@...com>,
        <sureshp@...ence.com>, <jpawar@...ence.com>, <kurahul@...ence.com>,
        <aniljoy@...ence.com>
Subject: Re: [PATCH v10 5/6] usb:cdns3 Add Cadence USB3 DRD Driver

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?

> +
> +		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;
> +}
> +

-- 
Regards
Vignesh