drm/vc4: hdmi: Disable audio if dmas property is present but empty

Browse source

The dmas property is used to hold the dmaengine channel used for audio
output.

Older device trees were missing that property, so if it's not there we
disable the audio output entirely.

However, some overlays have set an empty value to that property, mostly
to workaround the fact that overlays cannot remove a property. Let's add
a test for that case and if it's empty, let's disable it as well.

Cc: <stable@vger.kernel.org>
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
Link: https://lore.kernel.org/r/20220613144800.326124-18-maxime@cerno.tech
Signed-off-by: Maxime Ripard <maxime@cerno.tech>

...

This commit is contained in:

Phil Elwell 2022-06-13 16:47:44 +02:00 • committed by Maxime Ripard

parent 7bcb9c8d0b

commit db2b927f86

No known key found for this signature in database

GPG key ID: E3EF0D6F671851C5

1 changed files with 3 additions and 3 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

6

drivers/gpu/drm/vc4/vc4_hdmi.c

View file