On Tue, Sep 06, 2022 at 01:30:14PM +0200, gregkh@linuxfoundation.org wrote:

The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

Ah ok, for 5.15 this patch doesn't apply due to broken indentation that was later fixed. So could we also backport commit 18d6b39ee895 ("usb: gadget: f_uac2: clean up some inconsistent indenting") first or should this patch just be fixed up to apply standalone?

Jack

------------------ original commit in Linus's tree ------------------

From f511aef2ebe5377d4c263842f2e0c0b8e274e8e5 Mon Sep 17 00:00:00 2001 From: Jing Leng jleng@ambarella.com Date: Wed, 20 Jul 2022 18:48:15 -0700 Subject: [PATCH] usb: gadget: f_uac2: fix superspeed transfer

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 users 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.

Fixes: eaf6cbe09920 ("usb: gadget: f_uac2: add volume and mute support") Cc: stable stable@kernel.org Signed-off-by: Jing Leng jleng@ambarella.com Signed-off-by: Jack Pham quic_jackp@quicinc.com Link: https://lore.kernel.org/r/20220721014815.14453-1-quic_jackp@quicinc.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c index 1905a8d8e0c9..08726e4c68a5 100644 --- a/drivers/usb/gadget/function/f_uac2.c +++ b/drivers/usb/gadget/function/f_uac2.c @@ -291,6 +291,12 @@ 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,
• .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, @@ -604,7 +610,8 @@ 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, @@ -800,6 +807,7 @@ 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;

@@ -827,6 +835,7 @@ 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; @@ -855,8 +864,11 @@ 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);