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

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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

Change-Id: I3bef24e77d5d9dfc11438da24664192753e2cac4
Fixes: 913e4a90b6 ("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>
Signed-off-by: William Wu <william.wu@rock-chips.com>
(cherry picked from commit 789ea77310)
This commit is contained in:
Ruslan Bilovol
2021-03-01 13:49:31 +02:00
committed by Tao Huang
parent 1a81ee3e2d
commit d0f1327e76
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/gadget/function/f_uac2.c
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@@ -571,7 +571,7 @@ static int set_ep_max_packet_size(const struct f_uac_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));