usb: gadget: f_uac2: always increase endpoint max_packet_size by one audio slot

commit 789ea77310f0200c84002884ffd628e2baf3ad8a upstream.

As per UAC2 Audio Data Formats spec (2.3.1.1 USB Packets),
if the sampling rate is a constant, the allowable variation
of number of audio slots per virtual frame is +/- 1 audio slot.

It means that endpoint should be able to accept/send +1 audio
slot.

Previous endpoint max_packet_size calculation code
was adding sometimes +1 audio slot due to DIV_ROUND_UP
behaviour which was rounding up to closest integer.
However this doesn't work if the numbers are divisible.

It had no any impact with Linux hosts which ignore
this issue, but in case of more strict Windows it
caused rejected enumeration

Thus always add +1 audio slot to endpoint's max packet size

Fixes: 913e4a90b6f9 ("usb: gadget: f_uac2: finalize wMaxPacketSize according to bandwidth")
Cc: Peter Chen <peter.chen@freescale.com>
Cc: <stable@vger.kernel.org> #v4.3+
Signed-off-by: Ruslan Bilovol <ruslan.bilovol@gmail.com>
Link: https://lore.kernel.org/r/1614599375-8803-2-git-send-email-ruslan.bilovol@gmail.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 81af315774c62b47eecfeb3a963b033a8319e3d4..6903d02a933f55da2ccd46d8e3487ae04437a493 100644 (file)
--- a/drivers/usb/gadget/function/f_uac2.c
+++ b/drivers/usb/gadget/function/f_uac2.c
@@ -997,7 +997,7 @@ static int set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts,
        }
 
        max_size_bw = num_channels(chmask) * ssize *
-               DIV_ROUND_UP(srate, factor / (1 << (ep_desc->bInterval - 1)));
+               ((srate / (factor / (1 << (ep_desc->bInterval - 1)))) + 1);
        ep_desc->wMaxPacketSize = cpu_to_le16(min_t(u16, max_size_bw,
                                                    max_size_ep));