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UPSTREAM: mainboard/google/reef: Set IOSSTATE for trackpad I2C GPIOs

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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: Icd735ff83676dd179eaa6c38bb2c25562ac3905a
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: f224e836c0
Original-Change-Id: I5570ac37ec3cc41f6463dd6b858fdb56a20a1733
Original-Signed-off-by: Vaibhav Shankar <vaibhav.shankar@intel.com>
Original-Reviewed-on: https://review.coreboot.org/18251
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Tested-by: build bot (Jenkins)
Reviewed-on: https://chromium-review.googlesource.com/434478
This commit is contained in:
Vaibhav Shankar 2017-01-27 11:37:30 -08:00 • committed by chrome-bot
parent a020a9ba12
commit 7458645b0e
1 changed files with 4 additions and 2 deletions
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6
src/mainboard/google/reef/variants/baseboard/gpio.c
View file

@ -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 */