From bda338a1be38a50fae86a2e02ce8dac8bb9eb3f0 Mon Sep 17 00:00:00 2001
From: Tao Xia <xiatao5@huaqin.corp-partner.google.com>
Date: Sat, 27 Feb 2021 15:17:24 +0800
Subject: [PATCH] mb/google/dedede/var/sasukette: Configure I2C times for
 touchpad/codec/AMP

Configure I2C high / low time in device tree to ensure I2C
CLK runs accurately at I2C_SPEED_FAST (400 kHz).

Measured I2C frequency just as below after tuning:
touchpad:372 kHz
audio codec RT5682:386.8 kHz
speaker AMP L:387.5 kHz
speaker AMP R:388.9 kHz

BUG=b:181342340
BRANCH=dedede
TEST=Build and check after tuning I2C clock is under 400kHz

Signed-off-by: Tao Xia <xiatao5@huaqin.corp-partner.google.com>
Change-Id: I05d78c088190e349281a34b2aeed39ae8d867dc2
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51112
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
---
 .../google/dedede/variants/sasukette/overridetree.cb | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/mainboard/google/dedede/variants/sasukette/overridetree.cb b/src/mainboard/google/dedede/variants/sasukette/overridetree.cb
index 2b310ce529..fe7a2dd27e 100644
--- a/src/mainboard/google/dedede/variants/sasukette/overridetree.cb
+++ b/src/mainboard/google/dedede/variants/sasukette/overridetree.cb
@@ -21,6 +21,12 @@ chip soc/intel/jasperlake
 		},
 		.i2c[0] = {
 			.speed = I2C_SPEED_FAST,
+			.speed_config[0] = {
+				.speed = I2C_SPEED_FAST,
+				.scl_lcnt = 185,
+				.scl_hcnt = 95,
+				.sda_hold = 40,
+			}
 		},
 		.i2c[1] = {
 			.speed = I2C_SPEED_FAST,
@@ -33,6 +39,12 @@ chip soc/intel/jasperlake
 		},
 		.i2c[4] = {
 			.speed = I2C_SPEED_FAST,
+			.speed_config[0] = {
+				.speed = I2C_SPEED_FAST,
+				.scl_lcnt = 185,
+				.scl_hcnt = 95,
+				.sda_hold = 40,
+			}
 		},
 	}"