Change in coreboot[master]: mainboard/google/kahlee: Reset trackpad & touchscreen

[Martin Roth (Code Review)]

Martin Roth has uploaded this change for review. ( https://review.coreboot.org/28538

Change subject: mainboard/google/kahlee: Reset trackpad & touchscreen
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mainboard/google/kahlee: Reset trackpad & touchscreen

AMD chips don't hold off a reset to the end of I2c transitions, so
devices on the i2c bus can be left in a bad state.  To avoid this,
make sure the trackpad and touchscreen chips get disabled
during boot.

BUG=b:114411165
TEST=build, reboot watch trackpad enable go low

Change-Id: Ie50f4a102249df79517da571a6e768dba804cd57
Signed-off-by: Martin Roth 
---
M src/mainboard/google/kahlee/variants/baseboard/gpio.c
1 file changed, 8 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/38/28538/1

diff --git a/src/mainboard/google/kahlee/variants/baseboard/gpio.c b/src/mainboard/google/kahlee/variants/baseboard/gpio.c
index 66d5c99..75a8ab5 100644
--- a/src/mainboard/google/kahlee/variants/baseboard/gpio.c
+++ b/src/mainboard/google/kahlee/variants/baseboard/gpio.c
@@ -40,6 +40,10 @@
    /* GPIO_15 - EC_IN_RW_OD */
    PAD_GPI(GPIO_15, PULL_UP),

+	/* GPIO_12 - EN_PP3300_TRACKPAD */
+	/* Init low to reset the chip */
+	PAD_GPO(GPIO_12, LOW),
+
    /* GPIO_22 - EC_SCI_ODL, SCI */
    PAD_SCI(GPIO_22, PULL_UP, EDGE_LOW),

@@ -58,6 +62,10 @@
    /* GPIO_74 - LPC_CLK0_EC_R */
    PAD_NF(GPIO_74, LPCCLK0, PULL_DOWN),

+	/* GPIO_76 - EN_PP3300_TOUCHSCREEN */
+	/* Init low to reset the chip */
+	PAD_GPO(GPIO_76, LOW),
+
    /* GPIO_92 - WLAN_PCIE_CLKREQ_3V3_ODL */
    PAD_NF(GPIO_92, CLK_REQ0_L, PULL_UP),