Enable Hifiberry DAC with VC4 driver

[joaodriessen]

This is a support related question, so I apologise for posting it here, but I could not find relevant documentation on this.

running the 4.4.28 kernel on archlinuxarm.

enabling the VC4 driver (dtoverlay=vc4-kms-v3d) I no longer get audio from my DAC (dtoverlay=hifiberry-dacplus).
Is there a way to use you video driver in conjunction with the digital analog converter from HifiBerry?

[anholt]

My best bet would be that something went wrong in your config.txt setup. I don't know of any way that vc4 should interact with non-HDMI audio.

[joaodriessen]

The hardware is not being recognised by my system when I enable the video driver.

for reference, my config.txt, (maybe I screwed something up):

#hdmi_group=1
#hdmi_mode=4
#disable_overscan=1
#framebuffer_depth=32
#gpu_mem=256
dtoverlay=hifiberry-dacplus

avoid_warnings=2
dtoverlay=vc4-kms-v3d

[schnitzeltony]

On Wed, Nov 2, 2016 at 9:07 PM, Joao Driessen [email protected]
wrote:

The hardware is not being recognised by my system when I enable the video
driver.

for reference, my config.txt, (maybe I screwed something up):
See /boot/overlays/README for all available options

#hdmi_group=1
#hdmi_mode=4
#disable_overscan=1
#framebuffer_depth=32
#gpu_mem=256
dtoverlay=hifiberry-dacplus

avoid_warnings=2
dtoverlay=vc4-kms-v3d

I have same problem with a very similar config.txt:

dtoverlay=hifiberry-dacplus

Enable VC4 Graphics

dtoverlay=vc4-kms-v3d,cma-256

My kernel is

git://github.com/raspberrypi/linux.git
branch=rpi-4.4.y
commit 1c8b82b (should be quite recent
4.4.27)

I attached journalctl extract - see attachment. Seems i2s wants memory
already allocated. Checked hifiberry-dacplus.dts: i2s is required by
hifiberry.

I think this is more an issue for https://github.com/raspberrypi/linux.
Shall I open an issue there?

Ah one thing - (my environment does not boot without vc4 overlay):
@*joaodriessen
https://github.com/joaodriessen *is that correct that hifiberry works
fine for you in case vc4 is not enabled?

[joaodriessen]

Yes, as long as I don't enable Eric Anholt's driver, the hifiberry DAC+ works.

[schnitzeltony]

n Wed, Nov 2, 2016 at 10:52 PM, Joao Driessen [email protected]
wrote:

Yes, as long as I don't enable Eric Anholt's driver, the hifiberry DAC+
works.

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I think this is same as raspberrypi#1420 -
w can close this one

[joaodriessen]

would prefer to leave this issue open here so people who have the same issue find it and can follow the cookiecrumbs to raspberrypi#1420 and raspberrypi#1231

[joaodriessen]

using "vc4-fkms-v3d" the HifiBerry DAC will work on kernel 4.4
But I can't get any graphics acceleration going on with this setting yet, and can't say if that's due to my system setup or that it's not ready yet, I have no idea how to properly set this one up.

[anholt]

There's not much I can do for 4.4 if they're not taking the i2s clock backport. Downstream 4.9 has cprman on by default now, so closing this.