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Driver fixes and updates to kernel 3.18.16 and 4.0.5

hiassoft

Edit: Current kernel versions and install/config instructions are also available from my webpage http://www.horus.com/~hias/cirrus-driver.html

 

During the last few weeks I fixed various issues in the Wolfson/Cirrus driver and rebased it so it works with the current RPi kernel versions (3.18.16 and 4.0.5).

 

You can download the patches from my GitHub repository. The 3.18 kernel with Cirrus drivers is in the cirrus-3.18.y branch, the 4.0 kernel with Cirrus drivers is in the cirrus-4.0.y branch. I'll rebase and update these branches from time to time so that the Cirrus driver and my changes will stay on top of the commit list.

 

If you just want to have an updated 3.18.16 kernel you can download precompiled binaries from here. Just unpack the tarball in the root directory. Before you do that it might be a good idea to update the firmware files (bootcode.bin, start*.elf and fixup*.dat in the boot directory) to the latest version.

 

Here's a list of my changes:

- Added the FLL1 setup back so that switching between 44.1kHz and 48kHz (and other sample rates) works fine.

- Don't register Arizona IRQ if it's set to 0. The Cirrus driver uses polling here and if we register an interrupt handler for irq 0 we get lots of "spurious interrupt" messages spamming dmesg in kernel 3.19 and newer. IRQ 0 is wrong anyway.

- Include DCVDD patches from the Cirrus linux-drivers repository. These patches make sure the WM8804 chip is initialized properly. Without this patch I sometimes had SPDIF audio out only on the right channel.

- Disable spidev0 in Cirrus device tree overlay. That's mainly a safety precaution so that userspace programs trying to access spi0.0 won't interfere with the WM8804 reset line. I'm not 100% sure this is needed at all, so maybe I'll remove it some time later.

 

And some important notes:

I haven't included the mmap patch, this is already supported in the upstream kernels but currently disabled by default. To enable mmap support add the following line to config.txt:

dtoverlay=i2s-mmap

 

If you compile the kernel on your own please note that the devicetree overlays have now been moved to arch/arm/boot/dts/overlays.

 

Kernel 4.0 now uses spi_bcm2835 by default (the older spi_bcm2708 module is available via a devicetree overlay) so you have to extend your /etc/modprobe.d conf file and add a pre-depend for spi_bcm2835 as well. It's safe to have both the old and the new module in here, so just use this configuration:

softdep arizona-spi pre: arizona-ldo1
softdep spi-bcm2708 pre: fixed
softdep spi-bcm2835 pre: fixed

 

so long,

 

Hias

Parents Reply Children
  • in reply to Former Member

    志飞 姜 schrieb:

     

    Thank you very much!

    I have tried all the methods you mentioned above, but it still doesn't work.

    OK, lets do this step-by-step.

     

    First make sure you've disabled onboard sound and that "aplay -l" lists only the Cirrus card:

    pi@rpi3:~ $ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: sndrpiwsp [snd_rpi_wsp], device 0: WM5102 AiFi wm5102-aif1-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
pi@rpi3:~ $

     

    Then enter these 3 commands to configure output to Lineout and Headset out.

    Reset_paths.sh -q
Playback_to_Lineout.sh -q
Playback_to_Headset.sh -q

     

    Make sure that you don't get any error messages printed on the console, entering these commands should just return to the command prompt. It has to look like this:

    pi@rpi3:~ $ Reset_paths.sh -q
pi@rpi3:~ $ Playback_to_Lineout.sh -q
pi@rpi3:~ $ Playback_to_Headset.sh -q
pi@rpi3:~ $

     

    Now run "speaker-test -c 2 -t sine", this produce a 440Hz sine tone alternating on the left and right channel. The output should look like this:

    pi@rpi3:~ $ speaker-test -c 2 -t sine

speaker-test 1.0.28

Playback device is default
Stream parameters are 48000Hz, S16_LE, 2 channels
Sine wave rate is 440.0000Hz
Rate set to 48000Hz (requested 48000Hz)
Buffer size range from 16 to 131072
Period size range from 8 to 16383
Using max buffer size 131072
Periods = 4
was set period_size = 8192
was set buffer_size = 131072
 0 - Front Left
 1 - Front Right
Time per period = 3.141148
 0 - Front Left
 1 - Front Right

     

    If you still can't hear anything make sure everything's plugged in correctly. Also try connecting a headphone to the headphone out connector and check if you get sound there.

     

    If you get any error messages on the console or the output looks different please post it here.

     

    so long,

     

    Hias

  • in reply to hiassoft

    Is one to assume that if the steps in post 137 work then the card is working?

    Re: Driver fixes and updates to kernel 3.18.16 and 4.0.5

     

    While it may sound like a stupid question, I was under the impression my card was not working because the usecase-scripts were not outputting audio? Am I wrong to assume these files should output sound?

     

    I want to thank everyone in this discussion for their contributions especially Hias. Saved me lots of time and headache (although I do think what it took for us to get to a working card on Pi3 is pretty ridiculous). On a side note, does anyone a good API/Library I could use to send audio out through the Cirrus? What i'd like to do is setup the RPi 3 as an A2DP server using Bluetooth, connect another device and send the audio out through the Cirrus.