This was fixed by increasing the pull down strength of the gen8 i2c pins using the following patch to the DTB:
.../tegra194-soc/tegra194-soc-base.dtsi | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/soc/t19x/kernel-dts/tegra194-soc/tegra194-soc-base.dtsi b/soc/t19x/kernel-dts/tegra194-soc/tegra194-soc-base.dtsi
index 859e421..d1c3aee 100644
--- a/soc/t19x/kernel-dts/tegra194-soc/tegra194-soc-base.dtsi
+++ b/soc/t19x/kernel-dts/tegra194-soc/tegra194-soc-base.dtsi
@@ -1762,7 +1762,21 @@
reg = <0x0 0x2430000 0x0 0x17000
0x0 0xc300000 0x0 0x4000>;
#gpio-range-cells = <3>;
- status = "disabled";
+ status = "okay";
+
+ pinctrl-names = "default";
+ pinctrl-0 = <&gen8_i2c_default>;
+
+ gen8_i2c_default: gen8_i2c_blah {
+ gen8_i2c_scl {
+ nvidia,pins = "gen8_i2c_scl_pdd1";
+ nvidia,pull-down-strength = <31>;
+ };
+ gen8_i2c_sda {
+ nvidia,pins = "gen8_i2c_sda_pdd2";
+ nvidia,pull-down-strength = <31>;
+ };
+ };
vbus_en0_sfio_tristate_state: vbus_en0_oc_tristate {
usb_vbus_en0_pz1 {
Here’s the scope output with the new settings.
