linux-kernel - Re: [PATCH v3 1/4] usb: aspeed-vhub: add qualifier descriptor

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Message-ID: <590efb96ddd139ed7b9ffcfef1910d8688c4a877.camel@kernel.crashing.org>
Date:   Thu, 09 Dec 2021 11:04:00 +1100
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     Neal Liu <neal_liu@...eedtech.com>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Cai Huoqing <caihuoqing@...du.com>,
        Tao Ren <rentao.bupt@...il.com>,
        Julia Lawall <julia.lawall@...ia.fr>,
        kernel test robot <lkp@...el.com>,
        Sasha Levin <sashal@...nel.org>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org
Cc:     BMC-SW@...eedtech.com
Subject: Re: [PATCH v3 1/4] usb: aspeed-vhub: add qualifier descriptor

On Wed, 2021-12-08 at 18:05 +0800, Neal Liu wrote:
> USB3 Command Verifier (USB3CV) is the official tool for
> USB3 Hub and Device Framework testing.
> 
> A high-speed capable device that has different device information
> for full-speed and high-speed must have a Device Qualifier
> Descriptor.
> 
> This patch is to support device qualifier to pass
> USB3CV - Chapter 9 Test [USB 2 devices] - Device Qualifier Tests.
> 
> Signed-off-by: Neal Liu <neal_liu@...eedtech.com>
> ---

Acked-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>

>  drivers/usb/gadget/udc/aspeed-vhub/hub.c  | 24
> +++++++++++++++++++++++
>  drivers/usb/gadget/udc/aspeed-vhub/vhub.h |  1 +
>  2 files changed, 25 insertions(+)
> 
> diff --git a/drivers/usb/gadget/udc/aspeed-vhub/hub.c
> b/drivers/usb/gadget/udc/aspeed-vhub/hub.c
> index b9960fdd8a51..93f27a745760 100644
> --- a/drivers/usb/gadget/udc/aspeed-vhub/hub.c
> +++ b/drivers/usb/gadget/udc/aspeed-vhub/hub.c
> @@ -68,6 +68,18 @@ static const struct usb_device_descriptor
> ast_vhub_dev_desc = {
>  	.bNumConfigurations	= 1,
>  };
>  
> +static const struct usb_qualifier_descriptor ast_vhub_qual_desc = {
> +	.bLength = 0xA,
> +	.bDescriptorType = USB_DT_DEVICE_QUALIFIER,
> +	.bcdUSB = cpu_to_le16(0x0200),
> +	.bDeviceClass = USB_CLASS_HUB,
> +	.bDeviceSubClass = 0,
> +	.bDeviceProtocol = 0,
> +	.bMaxPacketSize0 = 64,
> +	.bNumConfigurations = 1,
> +	.bRESERVED = 0,
> +};
> +
>  /*
>   * Configuration descriptor: same comments as above
>   * regarding handling USB1 mode.
> @@ -271,9 +283,11 @@ static int ast_vhub_rep_desc(struct ast_vhub_ep
> *ep,
>  		BUILD_BUG_ON(dsize > sizeof(vhub->vhub_dev_desc));
>  		BUILD_BUG_ON(USB_DT_DEVICE_SIZE >=
> AST_VHUB_EP0_MAX_PACKET);
>  		break;
> +	case USB_DT_OTHER_SPEED_CONFIG:
>  	case USB_DT_CONFIG:
>  		dsize = AST_VHUB_CONF_DESC_SIZE;
>  		memcpy(ep->buf, &vhub->vhub_conf_desc, dsize);
> +		((u8 *)ep->buf)[1] = desc_type;
>  		BUILD_BUG_ON(dsize > sizeof(vhub->vhub_conf_desc));
>  		BUILD_BUG_ON(AST_VHUB_CONF_DESC_SIZE >=
> AST_VHUB_EP0_MAX_PACKET);
>  		break;
> @@ -283,6 +297,10 @@ static int ast_vhub_rep_desc(struct ast_vhub_ep
> *ep,
>  		BUILD_BUG_ON(dsize > sizeof(vhub->vhub_hub_desc));
>  		BUILD_BUG_ON(AST_VHUB_HUB_DESC_SIZE >=
> AST_VHUB_EP0_MAX_PACKET);
>  		break;
> +	case USB_DT_DEVICE_QUALIFIER:
> +		dsize = sizeof(vhub->vhub_qual_desc);
> +		memcpy(ep->buf, &vhub->vhub_qual_desc, dsize);
> +		break;
>  	default:
>  		return std_req_stall;
>  	}
> @@ -428,6 +446,8 @@ enum std_req_rc ast_vhub_std_hub_request(struct
> ast_vhub_ep *ep,
>  		switch (wValue >> 8) {
>  		case USB_DT_DEVICE:
>  		case USB_DT_CONFIG:
> +		case USB_DT_DEVICE_QUALIFIER:
> +		case USB_DT_OTHER_SPEED_CONFIG:
>  			return ast_vhub_rep_desc(ep, wValue >> 8,
>  						 wLength);
>  		case USB_DT_STRING:
> @@ -1033,6 +1053,10 @@ static int ast_vhub_init_desc(struct ast_vhub
> *vhub)
>  	else
>  		ret = ast_vhub_str_alloc_add(vhub, &ast_vhub_strings);
>  
> +	/* Initialize vhub Qualifier Descriptor. */
> +	memcpy(&vhub->vhub_qual_desc, &ast_vhub_qual_desc,
> +		sizeof(vhub->vhub_qual_desc));
> +
>  	return ret;
>  }
>  
> diff --git a/drivers/usb/gadget/udc/aspeed-vhub/vhub.h
> b/drivers/usb/gadget/udc/aspeed-vhub/vhub.h
> index 87a5dea12d3c..6b9dfa6e10eb 100644
> --- a/drivers/usb/gadget/udc/aspeed-vhub/vhub.h
> +++ b/drivers/usb/gadget/udc/aspeed-vhub/vhub.h
> @@ -425,6 +425,7 @@ struct ast_vhub {
>  	struct ast_vhub_full_cdesc	vhub_conf_desc;
>  	struct usb_hub_descriptor	vhub_hub_desc;
>  	struct list_head		vhub_str_desc;
> +	struct usb_qualifier_descriptor	vhub_qual_desc;
>  };
>  
>  /* Standard request handlers result codes */