topic Re: Deferring Audio Device Probe in i.MX Processors

Deferring Audio Device Probe

rashmi1 — Fri, 18 Oct 2019 20:58:40 GMT

Hi,

We are working on a custom board based on IMX-7d running Android. The board uses an audio codec (WM5110), audio DSP (with custom firmware) that is part of the codec's digital core and an audio switch connected to the headphone jack. As it stands, the DSP bootup is triggered by the ALSA PCM core and occurs much later after all the device probes (including both the codec and audio switch probes) and this is something of a black box to us.

We'd however like to defer the audio switch probe to after the DSP boot is complete. How do we go about doing this? Specifically, how do we expose the DSP boot status (see: kernel_imx/sound/soc/codecs/wm_adsp.c) to the audio switch driver and what mechanisms are preferred for deferring probe in a way that doesn't adversely impact the boot-time?

TIA

Rashmi

Re: Deferring Audio Device Probe

b36401 — Mon, 21 Oct 2019 01:26:08 GMT

Please try to restart pulseaudio (after some delay enough for DSP bootup) for it to rescan audio devices.

Re: Deferring Audio Device Probe

RutvijTrivedi207 — Wed, 05 Nov 2025 14:07:35 GMT

One good link to check step by step Audio bring up guide for NXP in Android and Linux - https://siliconsignals.io/audio-codec-bring-up-simplified-your-guide-to-android-linux-bsp-development/