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ALSA: usb-audio: qcom: Introduce QC USB SND offloading support

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Several Qualcomm SoCs have a dedicated audio DSP, which has the ability to
support USB sound devices.  This vendor driver will implement the required
handshaking with the DSP, in order to pass along required resources that
will be utilized by the DSP's USB SW.  The communication channel used for
this handshaking will be using the QMI protocol.  Required resources
include:
- Allocated secondary event ring address
- EP transfer ring address
- Interrupter number

The above information will allow for the audio DSP to execute USB transfers
over the USB bus.  It will also be able to support devices that have an
implicit feedback and sync endpoint as well.  Offloading these data
transfers will allow the main/applications processor to enter lower CPU
power modes, and sustain a longer duration in those modes.

Audio offloading is initiated with the following sequence:
1. Userspace configures to route audio playback to USB backend and starts
playback on the platform soundcard.
2. The Q6DSP AFE will communicate to the audio DSP to start the USB AFE
port.
3. This results in a QMI packet with a STREAM enable command.
4. The QC audio offload driver will fetch the required resources, and pass
this information as part of the QMI response to the STREAM enable command.
5. Once the QMI response is received the audio DSP will start queuing data
on the USB bus.

As part of step#2, the audio DSP is aware of the USB SND card and pcm
device index that is being selected, and is communicated as part of the QMI
request received by QC audio offload.  These indices will be used to handle
the stream enable QMI request.

Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
Acked-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250409194804.3773260-29-quic_wcheng@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wesley Cheng 2025-04-09 12:48:01 -07:00 • committed by Greg Kroah-Hartman
parent bd1979b9d3
commit 326bbc3482
4 changed files with 2004 additions and 1 deletions
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14
sound/usb/Kconfig
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@ -176,6 +176,20 @@ config SND_BCD2000
To compile this driver as a module, choose M here: the module
will be called snd-bcd2000.
config SND_USB_AUDIO_QMI
tristate "Qualcomm Audio Offload driver"
depends on QCOM_QMI_HELPERS && SND_USB_AUDIO && USB_XHCI_SIDEBAND && SND_SOC_USB
help
Say Y here to enable the Qualcomm USB audio offloading feature.
This module sets up the required QMI stream enable/disable
responses to requests generated by the audio DSP. It passes the
USB transfer resource references, so that the audio DSP can issue
USB transfers to the host controller.
To compile this driver as a module, choose M here: the module
will be called snd-usb-audio-qmi.
source "sound/usb/line6/Kconfig"
endif # SND_USB

2
sound/usb/Makefile
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@ -35,5 +35,5 @@ obj-$(CONFIG_SND_USB_UA101) += snd-usbmidi-lib.o
obj-$(CONFIG_SND_USB_USX2Y) += snd-usbmidi-lib.o
obj-$(CONFIG_SND_USB_US122L) += snd-usbmidi-lib.o
obj-$(CONFIG_SND) += misc/ usx2y/ caiaq/ 6fire/ hiface/ bcd2000/
obj-$(CONFIG_SND) += misc/ usx2y/ caiaq/ 6fire/ hiface/ bcd2000/ qcom/
obj-$(CONFIG_SND_USB_LINE6) += line6/

2
sound/usb/qcom/Makefile Normal file
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@ -0,0 +1,2 @@
snd-usb-audio-qmi-y := usb_audio_qmi_v01.o qc_audio_offload.o
obj-$(CONFIG_SND_USB_AUDIO_QMI) += snd-usb-audio-qmi.o

1987
sound/usb/qcom/qc_audio_offload.c Normal file
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