From f224e836c0236621b52ea7d3c1118d2053df3537 Mon Sep 17 00:00:00 2001 From: Vaibhav Shankar Date: Fri, 27 Jan 2017 11:37:30 -0800 Subject: mainboard/google/reef: Set IOSSTATE for trackpad I2C GPIOs I2C data (GPIO_132) and Clk (GPIO_133) lines are pulled low during standby states S3/S0ix. This causes leakage of power. To reduce the leakage, we have to pull these lines high during S3/S0ix. This is done by programming the IOSSTATE to HIz. Also note that we are using the internal pull ups to keep at SOC at 1.8V and the I2C lines are not floating. BUG=chrome-os-partner:62428,chrome-os-partner:61651 TEST=Enter S3/S0ix. Measure trackpad power. It should be less than 4mW. Also I2c lines should be pulled high in S3/S0ix. Change-Id: I5570ac37ec3cc41f6463dd6b858fdb56a20a1733 Signed-off-by: Vaibhav Shankar Reviewed-on: https://review.coreboot.org/18251 Reviewed-by: Aaron Durbin Tested-by: build bot (Jenkins) --- src/mainboard/google/reef/variants/baseboard/gpio.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'src') diff --git a/src/mainboard/google/reef/variants/baseboard/gpio.c b/src/mainboard/google/reef/variants/baseboard/gpio.c index 390ef0f3da..3bb9a5fabc 100644 --- a/src/mainboard/google/reef/variants/baseboard/gpio.c +++ b/src/mainboard/google/reef/variants/baseboard/gpio.c @@ -101,8 +101,10 @@ static const struct pad_config gpio_table[] = { PAD_CFG_NF(GPIO_131, UP_2K, DEEP, NF1), /* LPSS_I2C3_SCL */ /* I2C4 - trackpad */ - PAD_CFG_NF(GPIO_132, UP_2K, DEEP, NF1), /* LPSS_I2C4_SDA */ - PAD_CFG_NF(GPIO_133, UP_2K, DEEP, NF1), /* LPSS_I2C4_SCL */ + /* LPSS_I2C4_SDA */ + PAD_CFG_NF_IOSSTATE(GPIO_132, UP_2K, DEEP, NF1, HIZCRx1), + /* LPSS_I2C4_SCL */ + PAD_CFG_NF_IOSSTATE(GPIO_133, UP_2K, DEEP, NF1, HIZCRx1), /* I2C5 -- pen with external pulls */ PAD_CFG_NF(GPIO_134, NONE, DEEP, NF1), /* LPSS_I2C5_SDA */ -- cgit v1.2.3