fix for rpi4 display interfering with certain 2.4ghz wifi freqencies

arm-dts-rpi-4-disable-wifi-frequencies.patch

@@ -0,0 +1,37 @@
+From 358afb8b746d4a7ebaeeeaab7a1523895a8572c2 Mon Sep 17 00:00:00 2001
+From: Maxime Ripard <maxime@cerno.tech>
+Date: Thu, 29 Oct 2020 14:40:18 +0100
+Subject: ARM: dts: rpi-4: disable wifi frequencies
+
+The RPi4 WiFi chip and HDMI outputs have some frequency overlap with
+crosstalk around 2.4GHz. Let's mark it as such so we can use some evasive
+maneuvers.
+
+Signed-off-by: Maxime Ripard <maxime@cerno.tech>
+Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+Link: https://lore.kernel.org/r/20201029134018.1948636-3-maxime@cerno.tech
+---
+ arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
+index 09a1182c29363..403bacf986ebb 100644
+--- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
++++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
+@@ -181,12 +181,14 @@
+ &hdmi0 {
+ 	clocks = <&firmware_clocks 13>, <&firmware_clocks 14>, <&dvp 0>, <&clk_27MHz>;
+ 	clock-names = "hdmi", "bvb", "audio", "cec";
++	wifi-2.4ghz-coexistence;
+ 	status = "okay";
+ };
+ 
+ &hdmi1 {
+ 	clocks = <&firmware_clocks 13>, <&firmware_clocks 14>, <&dvp 1>, <&clk_27MHz>;
+ 	clock-names = "hdmi", "bvb", "audio", "cec";
++	wifi-2.4ghz-coexistence;
+ 	status = "okay";
+ };
+ 
+-- 
+cgit 1.2.3-1.el7

kernel.spec

@@ -849,6 +849,9 @@ Patch103: arm-pandaboard-fix-add-bluetooth.patch
 # Fix for USB on some newer RPi4 / firmware combinations
 Patch104: 0001-brcm-rpi4-fix-usb-numeration.patch
 
+# RPi-4 and wifi issues
+Patch105: arm-dts-rpi-4-disable-wifi-frequencies.patch
+
 # Nouveau mDP detection fix
 Patch107: 0001-drm-nouveau-kms-handle-mDP-connectors.patch