linux-kernel - Re: [PATCH 2/2] arm64: dts: qcom: qcm6490-fairphone-fp5: Enable USB audio offload support

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Message-ID: <445317ce-fe20-454c-a564-288372772b74@oss.qualcomm.com>
Date: Fri, 1 Aug 2025 16:03:38 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Luca Weiss <luca.weiss@...rphone.com>, cros-qcom-dts-watchers@...omium.org,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...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-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: qcom: qcm6490-fairphone-fp5: Enable USB
 audio offload support

On 8/1/25 3:51 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 xhci-hcd
> interrupts appear during playback, instead the ADSP will be handling the
> USB transfers.
> 
> Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
> ---
>  arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts b/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
> index e115b6a52b299ef663ccfb614785f8f89091f39d..d30912f952db271aa4fbc2570ca04b771ffef3ca 100644
> --- a/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
> +++ b/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
> @@ -1176,6 +1176,22 @@ platform {
>  			sound-dai = <&q6routing>;
>  		};
>  	};
> +
> +	usb-dai-link {
> +		link-name = "USB Playback";
> +
> +		codec {
> +			sound-dai = <&q6usbdai USB_RX>;
> +		};
> +
> +		cpu {
> +			sound-dai = <&q6afedai USB_RX>;
> +		};
> +
> +		platform {
> +			sound-dai = <&q6routing>;
> +		};

Because this is SoC component <-> SoC component mapping, this could live
in the SoC dtsi.. but then 7280 is a glorious mess with the firmware
flavors, so I suppose it should stay here..

Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

Konrad