1 files changed, 47 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0591-drm-vc4-hdmi-Add-an-audio-support-flag.patch b/target/linux/bcm27xx/patches-5.4/950-0591-drm-vc4-hdmi-Add-an-audio-support-flag.patch
new file mode 100644
index 0000000000..cc6cd86887
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0591-drm-vc4-hdmi-Add-an-audio-support-flag.patch
@@ -0,0 +1,47 @@
+From 6154f7383e2defe48eea7fddb6ce646a0069828b Mon Sep 17 00:00:00 2001
+From: Maxime Ripard <maxime@cerno.tech>
+Date: Thu, 6 Feb 2020 16:21:45 +0100
+Subject: [PATCH] drm/vc4: hdmi: Add an audio support flag
+
+The BCM2711 audio support doesn't work yet, so let's add a boolean to
+indicate whether or not it's supported, and only register a sound card if
+that boolean is set.
+
+Signed-off-by: Maxime Ripard <maxime@cerno.tech>
+---
+ drivers/gpu/drm/vc4/vc4_hdmi.c | 4 ++++
+ drivers/gpu/drm/vc4/vc4_hdmi.h | 3 +++
+ 2 files changed, 7 insertions(+)
+
+--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
++++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
+@@ -944,6 +944,9 @@ static int vc4_hdmi_audio_init(struct vc
+ 	int ret;
+ 	int len;
+ 
++	if (!vc4_hdmi->variant->audio_available)
++		return 0;
++
+ 	if (!of_find_property(dev->of_node, "dmas", &len) ||
+ 	    len == 0) {
+ 		dev_warn(dev,
+@@ -1444,6 +1447,7 @@ static int vc4_hdmi_dev_remove(struct pl
+ }
+ 
+ static const struct vc4_hdmi_variant bcm2835_variant = {
++	.audio_available	= true,
+ 	.registers		= vc4_hdmi_fields,
+ 	.num_registers		= ARRAY_SIZE(vc4_hdmi_fields),
+ 
+--- a/drivers/gpu/drm/vc4/vc4_hdmi.h
++++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
+@@ -32,6 +32,9 @@ struct vc4_hdmi_variant {
+ 	 */
+ 	unsigned int id;
+ 
++	/* Set to true when the audio support is available */
++	bool audio_available;
++
+ 	/* List of the registers available on that variant */
+ 	const struct vc4_hdmi_register *registers;
+