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From 3b5412d506f5b7f2d947346ccdda8b67c9902576 Mon Sep 17 00:00:00 2001
From: Hristo Venev <hristo@venev.name>
Date: Fri, 5 Jun 2020 09:22:49 +0000
Subject: [PATCH] snd_bcm2835: disable HDMI audio when vc4 is used
(#3640)
Things don't work too well when both the vc4 driver and the firmware
driver are trying to control the same audio output:
[ 763.569406] bcm2835_audio bcm2835_audio: vchi message timeout, msg=5
Hence, when the vc4 HDMI driver is used, let it control audio. This is done
by introducing a new device tree property to the audio node, and
extending the vc4-kms-v3d overlays to set it appropriately.
Signed-off-by: Hristo Venev <hristo@venev.name>
---
drivers/staging/vc04_services/bcm2835-audio/bcm2835.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
+++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.c
@@ -381,7 +381,9 @@ static int snd_bcm2835_alsa_probe(struct
}
if (!enable_compat_alsa) {
- set_hdmi_enables(dev);
+ if (!of_property_read_bool(dev->of_node, "brcm,disable-hdmi"))
+ set_hdmi_enables(dev);
+
// In this mode, always enable analog output
enable_headphones = true;
} else {
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