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