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Date:   Tue, 5 Oct 2021 13:31:07 +0200
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Pavel Hofman <pavel.hofman@ivitera.com>
Cc:     linux-usb@vger.kernel.org,
        Ruslan Bilovol <ruslan.bilovol@gmail.com>,
        Felipe Balbi <balbi@kernel.org>,
        Jerome Brunet <jbrunet@baylibre.com>,
        Jack Pham <jackp@codeaurora.org>
Subject: Re: [PATCH] usb: gadget: u_audio.c: Adding Playback Pitch ctl for
 sync playback
Message-ID: <YVw3e1zOS2QvKiM0@kroah.com>
References: <20210925143003.12476-1-pavel.hofman@ivitera.com>
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On Sat, Sep 25, 2021 at 04:30:03PM +0200, Pavel Hofman wrote:
> EP IN is hard-coded as ASYNC both in f_uac1 and f_uac2 but u_audio sends
> steady number of audio frames in each USB packet, without any control.
> 
> This patch adds 'Playback Pitch 1000000' ctl analogous to the existing
> 'Capture Pitch 1000000' ctl. The calculation of playback req->length in
> u_audio_iso_complete respects the Playback Pitch ctl value to 1ppm now.
> 
> Max. value for Playback Pitch is configured by the existing parameter
> uac2_opts->fb_max, used also for the Capture Pitch.
> 
> Since the EP IN packet size can be increased by uac2_opts->fb_max now,
> maxPacketSize for the playback direction is calculated by the same
> algorithm as for the async capture direction in
> f_uac2.c:set_ep_max_packet_size.
> 
> Signed-off-by: Pavel Hofman <pavel.hofman@ivitera.com>
> ---
>  drivers/usb/gadget/function/f_uac2.c  |  5 +-
>  drivers/usb/gadget/function/u_audio.c | 93 ++++++++++++++++++++-------
>  2 files changed, 74 insertions(+), 24 deletions(-)

Does not apply to my tree, what kernel release / branch did you make
this against?

thanks,

greg k-h