This is a note to let you know that I've just added the patch titled
usb: gadget: f_uac2: fix calculation of uac2->p_interval
to the 4.1-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-fix-calculation-of-uac2-p_interval.patch
and it can be found in the queue-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c41b7767673cb76adeb2b5fde220209f717ea13c Mon Sep 17 00:00:00 2001
From: Peter Chen <peter.chen@xxxxxxxxxxxxx>
Date: Mon, 27 Jul 2015 14:51:47 +0800
Subject: usb: gadget: f_uac2: fix calculation of uac2->p_interval
From: Peter Chen <peter.chen@xxxxxxxxxxxxx>
commit c41b7767673cb76adeb2b5fde220209f717ea13c upstream.
The p_interval should be less if the 'bInterval' at the descriptor
is larger, eg, if 'bInterval' is 5 for HS, the p_interval should be
8000 / 16 = 500.
It fixes the patch 9bb87f168931 ("usb: gadget: f_uac2: send
reasonably sized packets")
Fixes: 9bb87f168931 ("usb: gadget: f_uac2: send reasonably sized packets")
Acked-by: Daniel Mack <zonque@xxxxxxxxx>
Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx>
Signed-off-by: Felipe Balbi <balbi@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/gadget/function/f_uac2.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/usb/gadget/function/f_uac2.c
+++ b/drivers/usb/gadget/function/f_uac2.c
@@ -1162,14 +1162,14 @@ afunc_set_alt(struct usb_function *fn, u
factor = 1000;
} else {
ep_desc = &hs_epin_desc;
- factor = 125;
+ factor = 8000;
}
/* pre-compute some values for iso_complete() */
uac2->p_framesize = opts->p_ssize *
num_channels(opts->p_chmask);
rate = opts->p_srate * uac2->p_framesize;
- uac2->p_interval = (1 << (ep_desc->bInterval - 1)) * factor;
+ uac2->p_interval = factor / (1 << (ep_desc->bInterval - 1));
uac2->p_pktsize = min_t(unsigned int, rate / uac2->p_interval,
prm->max_psize);
Patches currently in stable-queue which might be from peter.chen@xxxxxxxxxxxxx are
queue-4.1/usb-chipidea-ehci_init_driver-is-intended-to-call-one-time.patch
queue-4.1/usb-udc-core-add-device_del-call-to-error-pathway.patch
queue-4.1/usb-gadget-f_uac2-fix-calculation-of-uac2-p_interval.patch
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