Add the required nodes for sound playback via a connected external display (DisplayPort over USB-C).
In user space just the following route needs to be set (e.g. using ALSA UCM):
amixer -c0 cset name='DISPLAY_PORT_RX Audio Mixer MultiMedia1' 1
Afterwards one can play audio on the MultiMedia1 sound device, e.g.:
aplay -D plughw:0,0 test.wav
Signed-off-by: Luca Weiss luca.weiss@fairphone.com --- (from cover letter) Unfortunately DisplayPort enablement itself for Fairphone 5 is not upstream yet. This is blocked by DSI display bringup upstream which is blocked by DSC 1:1:1 not being supported upstream yet and just working with a hacky patch. Nevertheless, DisplayPort audio was validated working with no additional sound-related changes so once DisplayPort gets enabled, sound should also just work upstream. --- arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts | 37 ++++++++++++++++++++++ 1 file changed, 37 insertions(+)
diff --git a/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts b/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts index 8ab30c01712e..45d4512546fe 100644 --- a/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts +++ b/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts @@ -14,6 +14,8 @@ #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,q6afe.h> +#include <dt-bindings/sound/qcom,q6asm.h> #include "sc7280.dtsi" #include "pm7250b.dtsi" #include "pm7325.dtsi" @@ -841,6 +843,12 @@ &pon_resin { status = "okay"; };
+&q6afedai { + dai@104 { + reg = <DISPLAY_PORT_RX>; + }; +}; + &qup_spi13_cs { drive-strength = <6>; bias-disable; @@ -914,6 +922,35 @@ &sdhc_2 { status = "okay"; };
+&sound { + compatible = "qcom,qcm6490-sndcard"; + model = "Fairphone 5"; + + mm1-dai-link { + link-name = "MultiMedia1"; + + cpu { + sound-dai = <&q6asmdai MSM_FRONTEND_DAI_MULTIMEDIA1>; + }; + }; + + displayport-rx-dai-link { + link-name = "DisplayPort Playback"; + + cpu { + sound-dai = <&q6afedai DISPLAY_PORT_RX>; + }; + + platform { + sound-dai = <&q6routing>; + }; + + codec { + sound-dai = <&mdss_dp>; + }; + }; +}; + &spi13 { status = "okay";