This is a note to let you know that I've just added the patch titled
usb: gadget: f_uac2: Populate SS descriptors' wBytesPerInterval
to the 5.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-gadget-f_uac2-populate-ss-descriptors-wbytesperinterval.patch
and it can be found in the queue-5.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f0e8a206a2a53a919e1709c654cb65d519f7befb Mon Sep 17 00:00:00 2001
From: Jack Pham <jackp@xxxxxxxxxxxxxx>
Date: Thu, 9 Sep 2021 10:48:11 -0700
Subject: usb: gadget: f_uac2: Populate SS descriptors' wBytesPerInterval
From: Jack Pham <jackp@xxxxxxxxxxxxxx>
commit f0e8a206a2a53a919e1709c654cb65d519f7befb upstream.
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@xxxxxxxxxxxxxxx>
Signed-off-by: Jack Pham <jackp@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210909174811.12534-3-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 | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/usb/gadget/function/f_uac2.c
+++ b/drivers/usb/gadget/function/f_uac2.c
@@ -951,6 +951,9 @@ afunc_bind(struct usb_configuration *cfg
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_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
hs_epin_fback_desc.bEndpointAddress = fs_epin_fback_desc.bEndpointAddress;
hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
Patches currently in stable-queue which might be from jackp@xxxxxxxxxxxxxx are
queue-5.14/usb-gadget-f_uac2-populate-ss-descriptors-wbytesperinterval.patch
queue-5.14/usb-gadget-f_uac2-add-missing-companion-descriptor-for-feedback-ep.patch
