target/linux/bcm27xx/patches-5.15/950-0699-ARM-dts-Permanently-disable-hdmi1-and-ddc1-on-CM4S.patch

   1 From 27dd29f219300bf3d4e5c26d5986ab6c73faa1e7 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.com>
   3 Date: Wed, 2 Feb 2022 17:47:54 +0000
   4 Subject: [PATCH] ARM: dts: Permanently disable hdmi1 and ddc1 on CM4S
   5
   6 CM4S has no HDMI1 output, so it is advisable to disable the controller
   7 and its I2C interface in software. This is ordinarily done by setting
   8 their status properties to "disabled", but the vc4-kms-v3d(-pi4)
   9 overlay enables both HDMIs and DDCs as part of the transfer of control
  10 from the VPU.
  11
  12 Knobble the CM4S dts in such a way that the overlay applies
  13 successfully but the hdmi1 and ddc1 nodes remain disabled by changing
  14 the compatible string to something unrecognised.
  15
  16 See: https://github.com/raspberrypi/linux/issues/4857
  17
  18 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
  19 ---
  20  arch/arm/boot/dts/bcm2711-rpi-cm4s.dts | 10 ++++++++++
  21  1 file changed, 10 insertions(+)
  22
  23 --- a/arch/arm/boot/dts/bcm2711-rpi-cm4s.dts
  24 +++ b/arch/arm/boot/dts/bcm2711-rpi-cm4s.dts
  25 @@ -367,6 +367,16 @@
  26         };
  27  };
  28
  29 +/* Permanently disable HDMI1 */
  30 +&hdmi1 {
  31 +       compatible = "disabled";
  32 +};
  33 +
  34 +/* Permanently disable DDC1 */
  35 +&ddc1 {
  36 +       compatible = "disabled";
  37 +};
  38 +
  39  &leds {
  40         act_led: led-act {
  41                 label = "led0";