linux-kernel - Re: [PATCH v2 1/4] usb: aspeed-vhub: add qualifier descriptor

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Date:   Tue, 30 Nov 2021 12:45:02 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Neal Liu <neal_liu@...eedtech.com>
Cc:     Felipe Balbi <balbi@...nel.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, BMC-SW@...eedtech.com
Subject: Re: [PATCH v2 1/4] usb: aspeed-vhub: add qualifier descriptor

On Tue, Nov 30, 2021 at 06:42:53PM +0800, Neal Liu wrote:
> Support qualifier descriptor to pass USB30CV compliance test.

Please provide more information here in this description.  This does not
explain what is happening here very well.

Also, what is "USB30CV"?

> 
> Signed-off-by: Neal Liu <neal_liu@...eedtech.com>
> ---
>  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,

Fields that are to be set to zero do not need to be set here, the
compiler does it for you.

thanks,

greg k-h