linux-kernel - Re: [PATCH 6/6] arm64: dts: qcom: sm7225-fairphone-fp4: Enable USB audio offload support

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Message-ID: <c2b490b5-9e8d-4da0-84c2-8c68d78920ca@oss.qualcomm.com>
Date: Mon, 28 Apr 2025 23:20:53 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Luca Weiss <luca.weiss@...rphone.com>,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, Felipe Balbi <balbi@...nel.org>,
        Srinivas Kandagatla <srini@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Wesley Cheng <quic_wcheng@...cinc.com>,
        Stephan Gerhold <stephan.gerhold@...aro.org>
Cc: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-sound@...r.kernel.org
Subject: Re: [PATCH 6/6] arm64: dts: qcom: sm7225-fairphone-fp4: Enable USB
 audio offload support

On 4/28/25 9:41 AM, Luca Weiss wrote:
> On Fri Apr 25, 2025 at 11:06 PM CEST, Konrad Dybcio wrote:
>> On 4/25/25 12:44 PM, Luca Weiss wrote:
>>> Enable USB audio offloading which allows to play audio via a USB-C
>>> headset with lower power consumption and enabling some other features.
>>>
>>> This can be used like the following:
>>>
>>>   $ amixer -c0 cset name='USB_RX Audio Mixer MultiMedia1' On
>>>   $ aplay --device=plughw:0,0 test.wav
>>>
>>> Compared to regular playback to the USB sound card no interrupts should
>>> appear on the xhci-hcd interrupts during playback, instead the ADSP will
>>> be handling the playback.
>>
>> "should" isn't very optimistic - I assume this works for you? > 
> 
> Yes it does!
> 
> With 'should' I meant to describe the expected behavior from using this
> since most people are probably not familiar with how this works.

ah, ok!

Konrad