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

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Message-ID: <gbys5x5qefrep3igd6wwcxqycmvjzsceqt2d5p64znbtjj4iyd@up4fq2cib3tu>
Date: Fri, 25 Apr 2025 22:04:43 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Luca Weiss <luca.weiss@...rphone.com>
Cc: 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>,
        ~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 Fri, Apr 25, 2025 at 12:44:56PM +0200, 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.
> 
> Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
> ---
>  arch/arm64/boot/dts/qcom/sm6350.dtsi              |  3 ++
>  arch/arm64/boot/dts/qcom/sm7225-fairphone-fp4.dts | 37 +++++++++++++++++++++++
>  2 files changed, 40 insertions(+)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>

-- 
With best wishes
Dmitry