From: Jack Pham <jackp@xxxxxxxxxxxxxx> commit 595091a1426a3b2625dad322f69fe569dc9d8943 upstream. The f_uac2 function fails to enumerate when connected in SuperSpeed due to the feedback endpoint missing the companion descriptor. Add a new ss_epin_fback_desc_comp descriptor and append it behind the ss_epin_fback_desc both in the static definition of the ss_audio_desc structure as well as its dynamic construction in setup_headers(). Fixes: 24f779dac8f3 ("usb: gadget: f_uac2/u_audio: add feedback endpoint support") Cc: stable <stable@xxxxxxxxxxxxxxx> Signed-off-by: Jack Pham <jackp@xxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20210909174811.12534-2-jackp@xxxxxxxxxxxxxx [jackp: Backport to 5.14 with minor conflict resolution] Signed-off-by: Jack Pham <jackp@xxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/gadget/function/f_uac2.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) --- a/drivers/usb/gadget/function/f_uac2.c +++ b/drivers/usb/gadget/function/f_uac2.c @@ -348,6 +348,14 @@ static struct usb_endpoint_descriptor ss .bInterval = 4, }; +static struct usb_ss_ep_comp_descriptor ss_epin_fback_desc_comp = { + .bLength = sizeof(ss_epin_fback_desc_comp), + .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, + .bMaxBurst = 0, + .bmAttributes = 0, + .wBytesPerInterval = cpu_to_le16(4), +}; + /* Audio Streaming IN Interface - Alt0 */ static struct usb_interface_descriptor std_as_in_if0_desc = { @@ -527,6 +535,7 @@ static struct usb_descriptor_header *ss_ (struct usb_descriptor_header *)&ss_epout_desc_comp, (struct usb_descriptor_header *)&as_iso_out_desc, (struct usb_descriptor_header *)&ss_epin_fback_desc, + (struct usb_descriptor_header *)&ss_epin_fback_desc_comp, (struct usb_descriptor_header *)&std_as_in_if0_desc, (struct usb_descriptor_header *)&std_as_in_if1_desc, @@ -604,6 +613,7 @@ static void setup_headers(struct f_uac2_ { 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_endpoint_descriptor *epout_desc; struct usb_endpoint_descriptor *epin_desc; struct usb_endpoint_descriptor *epin_fback_desc; @@ -626,6 +636,7 @@ static void setup_headers(struct f_uac2_ epout_desc_comp = &ss_epout_desc_comp; epin_desc_comp = &ss_epin_desc_comp; epin_fback_desc = &ss_epin_fback_desc; + epin_fback_desc_comp = &ss_epin_fback_desc_comp; } i = 0; @@ -654,8 +665,11 @@ static void setup_headers(struct f_uac2_ headers[i++] = USBDHDR(&as_iso_out_desc); - if (EPOUT_FBACK_IN_EN(opts)) + if (EPOUT_FBACK_IN_EN(opts)) { headers[i++] = USBDHDR(epin_fback_desc); + if (epin_fback_desc_comp) + headers[i++] = USBDHDR(epin_fback_desc_comp); + } } if (EPIN_EN(opts)) { headers[i++] = USBDHDR(&std_as_in_if0_desc);