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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

  • I have been here:

    www.horus.com/~hias/cirrus-driver.html looking at the precompiled kernel and I see that the latest one is 4.1.19 and it says it works for Rpi3 (which I've just received).  I've just received an Rpi3 and have a Cirrus Logic - Element14 audio board on order.  I also have an Rpi2 with the audio board and I believe I got the kernel 4.1.13 from this site (and it works wonderfully well).  Unfortunately, the current Arch Linux supplies kernel 4.1.20.

     

    So my question would be - will there be a downloadable 4.1.20 pre-patched and compiled kernel available?

     

    If not, where can I find step by step instructions on how to patch and compile the kernel myself?

  • in reply to Former Member

    So my question would be - will there be a downloadable 4.1.20 pre-patched and compiled kernel available?

     

    If not, where can I find step by step instructions on how to patch and compile the kernel myself?

    There aren't any really important changes to 4.1.20 (compared to 4.1.19) and the RPi foundation will switch to 4.4 soon. So I'll skip 4.1.20, also I don't have much time ATM, this weekend I'm at the Easterhegg image

     

    You can either use the 4.1.19 kernel or clone my 4.1 github tree (it's already up at 4.1.20 plus patches until yesterday) and compile it yourself - just like the standard RPi kerrnel. make bcm2709_defconfig enables all options needed for the Cirrus card.

     

    https://github.com/HiassofT/rpi-linux/tree/cirrus-4.1.y

     

    so long,

     

    Hias

  • in reply to hiassoft

    Ah yes, I downloaded the sources for 4.1.19 and I have finished the compile which looks good.  An experienced Linux friend explained that It would likely work to put the 4.1.19 kernel in a 4.1.20 installation.  The board should be delivered today, so I will be able to test it sometime later and I'll post here about my results.

     

    Thank you for this effort and hard work, very grateful.

  • in reply to Former Member

    Raspberry Pi 3 testing 4.1.19 kernel build

     

    I followed instructions at these sites:

    github.com/RoEdAl/linux-raspberrypi-wsp

    headless.audio/#raspberry-pi-2-model-b.

     

    From that, I downloaded sources for kernel 4.1.19 for Arch Linux.  I had initially installed Arch Linux with 4.1.20 kernel.  I then executed the pacman command and the compile took place without error (checked the log files for the word 'error').  I did the other modifications as well.  The system boots and doesn't appear to have any problems.

     

    When I execute aplay -l, I get:

    aplay: device_list:268: no soundcards found...

     

    Note that I blacklisted the Raspberry Pi 3 default on-board audio.  Before I did that, aplay -l would list only the on-board hardware.

     

    uname -a gives:

    Linux pi3 4.1.19-4-WSP #1 SMP Sat Mar 26 00:21:28 PDT 2016 armv7l GNU/Linux

     

    Both of the audio card LEDs (red and green) remain on.  I see no mention of wsp or cirrus in dmesg output using grep -i

     

    I have an Rpi2 with the same audio card which works, so tomorrow I'll put the new audio card on the Rpi2 and see if it works.

     

    /etc/modprobe.d/cirrus.conf

    softdep arizona-spi pre: arizona-ldo1

    softdep spi-bcm2708 pre: fixed

    softdep spi-bcm2835 pre: fixed

    blacklist snd_bcm2835

Reply
  • in reply to Former Member

    Raspberry Pi 3 testing 4.1.19 kernel build

     

    I followed instructions at these sites:

    github.com/RoEdAl/linux-raspberrypi-wsp

    headless.audio/#raspberry-pi-2-model-b.

     

    From that, I downloaded sources for kernel 4.1.19 for Arch Linux.  I had initially installed Arch Linux with 4.1.20 kernel.  I then executed the pacman command and the compile took place without error (checked the log files for the word 'error').  I did the other modifications as well.  The system boots and doesn't appear to have any problems.

     

    When I execute aplay -l, I get:

    aplay: device_list:268: no soundcards found...

     

    Note that I blacklisted the Raspberry Pi 3 default on-board audio.  Before I did that, aplay -l would list only the on-board hardware.

     

    uname -a gives:

    Linux pi3 4.1.19-4-WSP #1 SMP Sat Mar 26 00:21:28 PDT 2016 armv7l GNU/Linux

     

    Both of the audio card LEDs (red and green) remain on.  I see no mention of wsp or cirrus in dmesg output using grep -i

     

    I have an Rpi2 with the same audio card which works, so tomorrow I'll put the new audio card on the Rpi2 and see if it works.

     

    /etc/modprobe.d/cirrus.conf

    softdep arizona-spi pre: arizona-ldo1

    softdep spi-bcm2708 pre: fixed

    softdep spi-bcm2835 pre: fixed

    blacklist snd_bcm2835

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