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>;
+ };
+ };
};
&spi13 {
--
2.50.1
