From 460ddd2729f0dbb2723e48f3a22ffccbb78b42c7 Mon Sep 17 00:00:00 2001 From: Dave Stevenson Date: Tue, 31 Mar 2020 17:54:08 +0100 Subject: [PATCH] dt: Drop I2C for Pi4 HDMI interfaces to 97.5kHz. It was set to 390kHz, which is outside of the required spec for reading HDMI (max 100kHz). The i2c-brcmstb driver only supports a number of fixed bus speeds, of which 97.5kHz is the closest to 100kHz without exceeding it. Signed-off-by: Dave Stevenson --- arch/arm/boot/dts/bcm2711.dtsi | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/arch/arm/boot/dts/bcm2711.dtsi +++ b/arch/arm/boot/dts/bcm2711.dtsi @@ -358,7 +358,7 @@ compatible = "brcm,bcm2711-hdmi-i2c"; reg = <0x7ef04500 0x100>, <0x7ef00b00 0x300>; reg-names = "bsc", "auto-i2c"; - clock-frequency = <390000>; + clock-frequency = <97500>; status = "disabled"; }; @@ -395,7 +395,7 @@ compatible = "brcm,bcm2711-hdmi-i2c"; reg = <0x7ef09500 0x100>, <0x7ef05b00 0x300>; reg-names = "bsc", "auto-i2c"; - clock-frequency = <390000>; + clock-frequency = <97500>; status = "disabled"; }; };