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.

Fixes: f8cb3d556be3 ("usb: f_uac2: adds support for SS and SSP")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Jack Pham <jackp@codeaurora.org>
Link: https://lore.kernel.org/r/20210909174811.12534-3-jackp@codeaurora.org
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 d89c1ebb07f402e09c1f77b0716df59a788669a4..be864560bfeaaace69b716bd32b8e1187d36442f 100644 (file)
--- a/drivers/usb/gadget/function/f_uac2.c
+++ b/drivers/usb/gadget/function/f_uac2.c
@@ -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;