From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Jack Pham <jackp@codeaurora.org>
Cc: stable@vger.kernel.org
Subject: Re: [PATCH stable-5.14 2/2] usb: gadget: f_uac2: Populate SS descriptors' wBytesPerInterval
Date: Mon, 27 Sep 2021 18:56:43 +0200 [thread overview]
Message-ID: <YVH3yzBL8+HE+gtd@kroah.com> (raw)
In-Reply-To: <20210927161253.10977-2-jackp@codeaurora.org>
On Mon, Sep 27, 2021 at 09:12:53AM -0700, Jack Pham wrote:
> 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@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>
> [jackp: Backport to 5.14 with minor conflict resolution]
Both now queued up, thanks.
greg k-h
prev parent reply other threads:[~2021-09-27 16:56 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-27 16:12 [PATCH stable-5.14 1/2] usb: gadget: f_uac2: Add missing companion descriptor for feedback EP Jack Pham
2021-09-27 16:12 ` [PATCH stable-5.14 2/2] usb: gadget: f_uac2: Populate SS descriptors' wBytesPerInterval Jack Pham
2021-09-27 16:56 ` Greg Kroah-Hartman [this message]
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