[v2] usb: gadget: f_uac2: fix superspeed transfer

From: Jing Leng <jleng@ambarella.com>

On page 362 of the USB3.2 specification (
https://usb.org/sites/default/files/usb_32_20210125.zip),
The 'SuperSpeed Endpoint Companion Descriptor' shall only be returned
by Enhanced SuperSpeed devices that are operating at Gen X speed.
Each endpoint described in an interface is followed by a 'SuperSpeed
Endpoint Companion Descriptor'.

If we use SuperSpeed UDC, host can't recognize the device if endpoint
doesn't have 'SuperSpeed Endpoint Companion Descriptor' followed.

Currently in the uac2 driver code:
1. ss_epout_desc_comp follows ss_epout_desc;
2. ss_epin_fback_desc_comp follows ss_epin_fback_desc;
3. ss_epin_desc_comp follows ss_epin_desc;
4. Only ss_ep_int_desc endpoint doesn't have 'SuperSpeed Endpoint
Companion Descriptor' followed, so we should add it.

Signed-off-by: Jing Leng <jleng@ambarella.com>
---
 drivers/usb/gadget/function/f_uac2.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

On Mon, Feb 14, 2022 at 10:32:23PM +0800, 3090101217@zju.edu.cn wrote:
> From: Jing Leng <jleng@ambarella.com>
> 
> On page 362 of the USB3.2 specification (
> https://usb.org/sites/default/files/usb_32_20210125.zip),
> The 'SuperSpeed Endpoint Companion Descriptor' shall only be returned
> by Enhanced SuperSpeed devices that are operating at Gen X speed.
> Each endpoint described in an interface is followed by a 'SuperSpeed
> Endpoint Companion Descriptor'.
> 
> If we use SuperSpeed UDC, host can't recognize the device if endpoint
> doesn't have 'SuperSpeed Endpoint Companion Descriptor' followed.
> 
> Currently in the uac2 driver code:
> 1. ss_epout_desc_comp follows ss_epout_desc;
> 2. ss_epin_fback_desc_comp follows ss_epin_fback_desc;
> 3. ss_epin_desc_comp follows ss_epin_desc;
> 4. Only ss_ep_int_desc endpoint doesn't have 'SuperSpeed Endpoint
> Companion Descriptor' followed, so we should add it.
> 
> Signed-off-by: Jing Leng <jleng@ambarella.com>
> ---
>  drivers/usb/gadget/function/f_uac2.c | 19 +++++++++++++++++--
>  1 file changed, 17 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c
> index 097a709549d6..a6fc492f9148 100644
> --- a/drivers/usb/gadget/function/f_uac2.c
> +++ b/drivers/usb/gadget/function/f_uac2.c
> @@ -282,6 +282,14 @@ static struct usb_endpoint_descriptor ss_ep_int_desc = {
>  	.bInterval = 4,
>  };
>  
> +static struct usb_ss_ep_comp_descriptor ss_ep_int_desc_comp = {
> +	.bLength = sizeof(ss_ep_int_desc_comp),
> +	.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
> +	.bMaxBurst = 0,
> +	.bmAttributes = 0,
> +	.wBytesPerInterval = cpu_to_le16(6),
> +};
> +
>  /* Audio Streaming OUT Interface - Alt0 */
>  static struct usb_interface_descriptor std_as_out_if0_desc = {
>  	.bLength = sizeof std_as_out_if0_desc,
> @@ -595,7 +603,8 @@ static struct usb_descriptor_header *ss_audio_desc[] = {
>  	(struct usb_descriptor_header *)&in_feature_unit_desc,
>  	(struct usb_descriptor_header *)&io_out_ot_desc,
>  
> -  (struct usb_descriptor_header *)&ss_ep_int_desc,
> +	(struct usb_descriptor_header *)&ss_ep_int_desc,
> +	(struct usb_descriptor_header *)&ss_ep_int_desc_comp,
>  
>  	(struct usb_descriptor_header *)&std_as_out_if0_desc,
>  	(struct usb_descriptor_header *)&std_as_out_if1_desc,
> @@ -657,6 +666,7 @@ static int set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts,
>  
>  	case USB_SPEED_HIGH:
>  	case USB_SPEED_SUPER:
> +	case USB_SPEED_SUPER_PLUS:
>  		max_size_ep = 1024;
>  		factor = 8000;
>  		break;
> @@ -723,6 +733,7 @@ static void setup_headers(struct f_uac2_opts *opts,
>  	struct usb_ss_ep_comp_descriptor *epout_desc_comp = NULL;
>  	struct usb_ss_ep_comp_descriptor *epin_desc_comp = NULL;
>  	struct usb_ss_ep_comp_descriptor *epin_fback_desc_comp = NULL;
> +	struct usb_ss_ep_comp_descriptor *ep_int_desc_comp = NULL;
>  	struct usb_endpoint_descriptor *epout_desc;
>  	struct usb_endpoint_descriptor *epin_desc;
>  	struct usb_endpoint_descriptor *epin_fback_desc;
> @@ -750,6 +761,7 @@ static void setup_headers(struct f_uac2_opts *opts,
>  		epin_fback_desc = &ss_epin_fback_desc;
>  		epin_fback_desc_comp = &ss_epin_fback_desc_comp;
>  		ep_int_desc = &ss_ep_int_desc;
> +		ep_int_desc_comp = &ss_ep_int_desc_comp;
>  	}
>  
>  	i = 0;
> @@ -778,8 +790,11 @@ static void setup_headers(struct f_uac2_opts *opts,
>  	if (EPOUT_EN(opts))
>  		headers[i++] = USBDHDR(&io_out_ot_desc);
>  
> -	if (FUOUT_EN(opts) || FUIN_EN(opts))
> +	if (FUOUT_EN(opts) || FUIN_EN(opts)) {
>  		headers[i++] = USBDHDR(ep_int_desc);
> +		if (ep_int_desc_comp)
> +			headers[i++] = USBDHDR(ep_int_desc_comp);
> +	}
>  
>  	if (EPOUT_EN(opts)) {
>  		headers[i++] = USBDHDR(&std_as_out_if0_desc);
> -- 
> 2.17.1
> 

Hi,

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