FAILED: patch "[PATCH] usb: gadget: f_uac2: Populate SS descriptors'" failed to apply to 5.14-stable tree

The patch below does not apply to the 5.14-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 <[email protected]>.

thanks,

greg k-h

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

From f0e8a206a2a53a919e1709c654cb65d519f7befb Mon Sep 17 00:00:00 2001
From: Jack Pham <[email protected]>
Date: Thu, 9 Sep 2021 10:48:11 -0700
Subject: [PATCH] usb: gadget: f_uac2: Populate SS descriptors'
wBytesPerInterval

For Isochronous endpoints, the SS companion descriptor's wBytesPerInterval field is required to reserve bus time in order to transmit the required payload during the service interval. If left at 0, the UAC2 function is unable to transact data on its playback or capture endpoints in SuperSpeed mode.

Since f_uac2 currently does not support any bursting this value can be exactly equal to the calculated wMaxPacketSize.

Tested with Windows 10 as a host.

index d89c1ebb07f4..be864560bfea 100644
@@ -1178,6 +1178,9 @@ afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
 	agdev->out_ep_maxpsize = max_t(u16, agdev->out_ep_maxpsize,
 				le16_to_cpu(ss_epout_desc.wMaxPacketSize));
 
+	ss_epin_desc_comp.wBytesPerInterval = ss_epin_desc.wMaxPacketSize;
+	ss_epout_desc_comp.wBytesPerInterval = ss_epout_desc.wMaxPacketSize;
+
 	// HS and SS endpoint addresses are copied from autoconfigured FS descriptors
 	hs_ep_int_desc.bEndpointAddress = fs_ep_int_desc.bEndpointAddress;
 	hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;