blob: 9e32fc4b4c7bc482c80f0acb2a255d4361d96688 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
From 4de61df3c777ea6265d03be98b315c8644003ceb Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Wed, 31 Jul 2019 17:36:34 +0100
Subject: [PATCH] drm/vc4: A present but empty dmas disables audio
Overlays are unable to remove properties in the base DTB, but they
can overwrite them. Allow a present but empty 'dmas' property
to also disable the HDMI audio interface.
See: https://github.com/raspberrypi/linux/issues/2489
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
drivers/gpu/drm/vc4/vc4_hdmi.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -1330,10 +1330,12 @@ static int vc4_hdmi_audio_init(struct vc
const __be32 *addr;
int index;
int ret;
+ int len;
- if (!of_find_property(dev->of_node, "dmas", NULL)) {
+ if (!of_find_property(dev->of_node, "dmas", &len) ||
+ len == 0) {
dev_warn(dev,
- "'dmas' DT property is missing, no HDMI audio\n");
+ "'dmas' DT property is missing or empty, no HDMI audio\n");
return 0;
}
|
