diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0621-dt-Drop-I2C-for-Pi4-HDMI-interfaces-to-97.5kHz.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0621-dt-Drop-I2C-for-Pi4-HDMI-interfaces-to-97.5kHz.patch | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0621-dt-Drop-I2C-for-Pi4-HDMI-interfaces-to-97.5kHz.patch b/target/linux/bcm27xx/patches-5.4/950-0621-dt-Drop-I2C-for-Pi4-HDMI-interfaces-to-97.5kHz.patch new file mode 100644 index 0000000000..cd18cd1309 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0621-dt-Drop-I2C-for-Pi4-HDMI-interfaces-to-97.5kHz.patch @@ -0,0 +1,35 @@ +From 460ddd2729f0dbb2723e48f3a22ffccbb78b42c7 Mon Sep 17 00:00:00 2001 +From: Dave Stevenson <dave.stevenson@raspberrypi.com> +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 <dave.stevenson@raspberrypi.com> +--- + 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"; + }; + }; |