[3.616] I2S DAC Master Mode No Longer Available with RPi3B/4B & Hifiberry DAC+ Pro

Geachlab · February 15, 2024, 9:04pm

Prerequisites

Volumio Information

Volumio Version: 3.616
Hardware: RPi3B,4B
DAC: Hifiberry dac+ Pro

Debug Log

Steps to Reproduce

Perform a clean install of Volumio 3.616 on my RPi3B or RPi4B
Select and configure the "HiFiBerry DAC+ Pro" as the I2S DAC, and reboot.
The DAC is operating in the undesirable I2S Slave Mode, not the I2S Master Mode. Even after reconfiguring the DAC Model, the result is the same.

Additional Information

Here is the last line of /boot/config.txt immediately after installing Volumio 3.616:

#### Volumio i2s setting below: do not alter ####
dtoverlay=hifiberry-dacplus,slave

The “,slave” option above was not present in previous versions (3.5xx or before). This option seems to be a temporary workaround for the RPi5, which does not yet support I2S Master Mode. However, this should be irrelevant for the RPi3 and RPi4, which do support I2S Master Mode.

I am referring to the following discussion on GitHub regarding this issue:

github.com/raspberrypi/linux

I2S audio DAC (hifiberry-dacplus) not working on Raspberry Pi 5

opened 11:37AM - 20 Nov 23 UTC

closed 10:08AM - 21 Nov 23 UTC

KonstaT

### Describe the bug I2S audio DAC (hifiberry-dacplus) is not working on Raspbe…rry Pi 5. ### Steps to reproduce the behaviour Enabled the DAC by adding/modifying following lines in config.txt: ``` dtparam=i2s=on dtoverlay=hifiberry-dacplus #dtparam=audio=on ``` Audio DAC is not listed as an ALSA device in `cat /proc/asound/cards`. Relevant error in `dmesg` output: ``` [ 7.123353] designware-i2s 1f000a4000.i2s: ASoC: error at snd_soc_dai_set_fmt on 1f000a4000.i2s: -22 [ 7.123610] snd-rpi-hifiberry-dacplus soc:sound: snd_soc_register_card() failed: -22 [ 7.123618] snd-rpi-hifiberry-dacplus: probe of soc:sound failed with error -22 ``` ``` uname -a Linux raspberrypi 6.1.0-rpi6-rpi-2712 #1 SMP PREEMPT Debian 1:6.1.58-1+rpt2 (2023-10-27) aarch64 GNU/Linux ``` If I switch the same sdcard and the DAC to Raspberry Pi 4, it works as expected. ``` cat /proc/asound/cards 0 [vc4hdmi0 ]: vc4-hdmi - vc4-hdmi-0 vc4-hdmi-0 1 [vc4hdmi1 ]: vc4-hdmi - vc4-hdmi-1 vc4-hdmi-1 2 [sndrpihifiberry]: HifiberryDacp - snd_rpi_hifiberry_dacplus snd_rpi_hifiberry_dacplus ``` ``` uname -a Linux raspberrypi 6.1.0-rpi6-rpi-v8 #1 SMP PREEMPT Debian 1:6.1.58-1+rpt2 (2023-10-27) aarch64 GNU/Linux ``` I can also reproduce the same behaviour/issue with my 6.1.61 Android kernel where the Pi kernel is merged at https://github.com/raspberrypi/linux/tree/6137fb168c08bd8c41c8421bf26f09ed29479f08. ### Device (s) Other ### System 2023-10-10-raspios-bookworm-arm64 ``` sudo apt update sudo apt full-upgrade ``` ### Logs _No response_ ### Additional context _No response_

It feels unfair that the stable operation of the RPi3 and RPi4 is being affected due to the development of the RPi5. I believe it would be desirable for the system to have optimal settings for each RPi model.
Could you please investigate whether my understanding is correct or if this is a bug?

Thank you for reading until the end.

michel8166 · February 15, 2024, 10:03pm

deleted.

Darmur · February 16, 2024, 8:55am

For RPi5, this won’t be temporary, due to the new HW architecture all the I2S DACs must work in slave mode on that version.

However, we got your concern, we will restore the overlays without the “slave” parameters for the older models.

As a temporary solution, you can remove the dtoverlay string with the “slave” parameter from config.txt and add the same string without the “slave” parameter on userconfig.txt

Geachlab · February 16, 2024, 10:39am

Hi, Darmur,

Thank you for your quickiy and excellent reply. I understand the situation with the RPi5.
I appreciate your consideration for my concerns and the older models (RPi3, RPi4). I am looking forward to the improved version!
I also understand the temporary solution. It will be the good solution for my techinical article customers until the improved version arrives.

I hope that your Volumio products will become even better! Thank you!