mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-22 23:12:32 +00:00
42 lines
1.2 KiB
Diff
42 lines
1.2 KiB
Diff
|
From 27dd29f219300bf3d4e5c26d5986ab6c73faa1e7 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Phil Elwell <phil@raspberrypi.com>
|
||
|
|
Date: Wed, 2 Feb 2022 17:47:54 +0000
|
||
|
|
Subject: [PATCH] ARM: dts: Permanently disable hdmi1 and ddc1 on CM4S
|
||
|
|
|
||
|
|
CM4S has no HDMI1 output, so it is advisable to disable the controller
|
||
|
|
and its I2C interface in software. This is ordinarily done by setting
|
||
|
|
their status properties to "disabled", but the vc4-kms-v3d(-pi4)
|
||
|
|
overlay enables both HDMIs and DDCs as part of the transfer of control
|
||
|
|
from the VPU.
|
||
|
|
|
||
|
|
Knobble the CM4S dts in such a way that the overlay applies
|
||
|
|
successfully but the hdmi1 and ddc1 nodes remain disabled by changing
|
||
|
|
the compatible string to something unrecognised.
|
||
|
|
|
||
|
|
See: https://github.com/raspberrypi/linux/issues/4857
|
||
|
|
|
||
|
|
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
|
||
|
|
---
|
||
|
|
arch/arm/boot/dts/bcm2711-rpi-cm4s.dts | 10 ++++++++++
|
||
|
|
1 file changed, 10 insertions(+)
|
||
|
|
|
||
|
|
--- a/arch/arm/boot/dts/bcm2711-rpi-cm4s.dts
|
||
|
|
+++ b/arch/arm/boot/dts/bcm2711-rpi-cm4s.dts
|
||
|
|
@@ -367,6 +367,16 @@
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
+/* Permanently disable HDMI1 */
|
||
|
|
+&hdmi1 {
|
||
|
|
+ compatible = "disabled";
|
||
|
|
+};
|
||
|
|
+
|
||
|
|
+/* Permanently disable DDC1 */
|
||
|
|
+&ddc1 {
|
||
|
|
+ compatible = "disabled";
|
||
|
|
+};
|
||
|
|
+
|
||
|
|
&leds {
|
||
|
|
act_led: led-act {
|
||
|
|
label = "led0";
|