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.
Reviewed-by: Dmitry Baryshkov <dmitry.barysh...@oss.qualcomm.com>
Signed-off-by: Luca Weiss <luca.we...@fairphone.com>
---
arch/arm64/boot/dts/qcom/sm6350.dtsi | 3 ++
arch/arm64/boot/dts/qcom/sm7225-fairphone-fp4.dts | 36 +++++++++++++++++++++++
2 files changed, 39 insertions(+)
diff --git a/arch/arm64/boot/dts/qcom/sm6350.dtsi
b/arch/arm64/boot/dts/qcom/sm6350.dtsi
index
92a2f6e0c3d856eb2549a89509486979a7439cd8..864874472248dbdc5ab6483108bdb286afa77de5
100644
--- a/arch/arm64/boot/dts/qcom/sm6350.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm6350.dtsi
@@ -2956,6 +2956,9 @@ wifi: wifi@18800000 {
};
};
+ sound: sound {
+ };
+
thermal-zones {
aoss0-thermal {
thermal-sensors = <&tsens0 0>;
diff --git a/arch/arm64/boot/dts/qcom/sm7225-fairphone-fp4.dts
b/arch/arm64/boot/dts/qcom/sm7225-fairphone-fp4.dts
index
71e87ab929551b339216a5fa583833ed8661a606..60ad7884c635ec28a3706da506c16a78b3214265
100644
--- a/arch/arm64/boot/dts/qcom/sm7225-fairphone-fp4.dts
+++ b/arch/arm64/boot/dts/qcom/sm7225-fairphone-fp4.dts
@@ -19,6 +19,7 @@
#include <dt-bindings/leds/common.h>
#include <dt-bindings/pinctrl/qcom,pmic-gpio.h>
#include <dt-bindings/regulator/qcom,rpmh-regulator.h>
+#include <dt-bindings/sound/qcom,q6asm.h>
#include <dt-bindings/usb/pd.h>
#include "sm7225.dtsi"
#include "pm6150l.dtsi"
@@ -955,6 +956,12 @@ channel@644 {
};
};
+&q6asmdai {
+ dai@0 {
+ reg = <MSM_FRONTEND_DAI_MULTIMEDIA1>;
+ };
+};
+
&qup_uart1_cts {
/*
* Configure a bias-bus-hold on CTS to lower power
@@ -1023,6 +1030,35 @@ &sdhc_2 {
status = "okay";
};
+&sound {
+ compatible = "fairphone,fp4-sndcard";
+ model = "Fairphone 4";
+
+ mm1-dai-link {
+ link-name = "MultiMedia1";
+
+ cpu {
+ sound-dai = <&q6asmdai MSM_FRONTEND_DAI_MULTIMEDIA1>;
+ };
+ };
+
+ usb-dai-link {
+ link-name = "USB Playback";
+
+ codec {
+ sound-dai = <&q6usbdai USB_RX>;
+ };
+
+ cpu {
+ sound-dai = <&q6afedai USB_RX>;
+ };
+
+ platform {
+ sound-dai = <&q6routing>;
+ };
+ };
+};
+
&tlmm {
gpio-reserved-ranges = <13 4>, <56 2>;
--
2.49.0
