From: Thierry Reding <treding@nvidia.com>
Date: Thu, 14 Dec 2017 13:25:37 +0100
Subject: drm/tegra: dpaux: Keep reset defaults for hybrid pad parameters
Git-commit: 72ba4cf52410c0426a299f2ac82acd38c27c8207
Patch-mainline: v4.16-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Keep the reset values for the common mode voltage, output driver
impedance control and output driver current control parameters. This
fixes errors seen during SCDC communication with HDMI sinks.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/tegra/dpaux.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/tegra/dpaux.c
+++ b/drivers/gpu/drm/tegra/dpaux.c
@@ -322,6 +322,9 @@ static int tegra_dpaux_pad_config(struct
 	case DPAUX_PADCTL_FUNC_I2C:
 		value = DPAUX_HYBRID_PADCTL_I2C_SDA_INPUT_RCV |
 			DPAUX_HYBRID_PADCTL_I2C_SCL_INPUT_RCV |
+			DPAUX_HYBRID_PADCTL_AUX_CMH(2) |
+			DPAUX_HYBRID_PADCTL_AUX_DRVZ(4) |
+			DPAUX_HYBRID_PADCTL_AUX_DRVI(0x18) |
 			DPAUX_HYBRID_PADCTL_MODE_I2C;
 		break;