On Fri Aug 1, 2025 at 4:03 PM CEST, Konrad Dybcio wrote:
> 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.we...@fairphone.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..
q6afe definitely doesn't exist on the RB3Gen2 for example with
AudioReach, so yeah... I guess also the sound setup on other (simpler)
platforms can be simplified quite a bit, but it's (unfortunately) not
yet a major concern given the limited number of boards with good and
complete audio support.
>
> Reviewed-by: Konrad Dybcio <konrad.dyb...@oss.qualcomm.com>
Thanks!
Regards
Luca
>
> Konrad
