On 4/25/25 12:44 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 interrupts should
> appear on the xhci-hcd interrupts during playback, instead the ADSP will
> be handling the playback.
"should" isn't very optimistic - I assume this works for you? >
> Signed-off-by: Luca Weiss <luca.we...@fairphone.com>
> ---
[...]
> +&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";
> +
> + cpu {
> + sound-dai = <&q6afedai USB_RX>;
> + };
> +
> + codec {
> + sound-dai = <&q6usbdai USB_RX>;
> + };
'co'dec < 'cp'u> +
> + platform {
> + sound-dai = <&q6routing>;
> + };
> + };
> +};
> +
> &tlmm {
> gpio-reserved-ranges = <13 4>, <56 2>;
>
> @@ -1178,6 +1214,7 @@ &usb_1 {
> &usb_1_dwc3 {
> maximum-speed = "super-speed";
> dr_mode = "otg";
> + num-hc-interrupters = /bits/ 16 <3>;
Where does this number come from?
Konrad
