openwrt/target/linux/bcm27xx/patches-5.4/950-0281-drm-vc4-A-present-but-empty-dmas-disables-audio.patch
Petr Štetiar ef5d37ba5e kernel: bump 5.4 to 5.4.35
Refreshed one patch.

Run tested: qemu-x86-64
Build tested: x86/64, imx6, sunxi/a53, rockchip/armv8

Signed-off-by: Petr Štetiar <ynezz@true.cz>
2020-04-25 13:22:28 +02:00

34 lines
1.1 KiB
Diff

From 88d5709082671ff2abeddc2a9b4acacbb85b9194 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
@@ -1066,10 +1066,12 @@ static int vc4_hdmi_audio_init(struct vc
struct device *dev = &hdmi->pdev->dev;
const __be32 *addr;
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;
}