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hammer: Enable internal pull-up on UART RX line

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Prevent spurious wake when servo is not connected.

BRANCH=none
BUG=b:36119938
TEST=Measure pull up value with a multimeter when servo is not
     connected: value around 30k when host in S0 and S3.

Change-Id: I8bd54e4dcfd5c65f1f0cd32ffd4a70cedb979cc2
Reviewed-on: https://chromium-review.googlesource.com/452652
Commit-Ready: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
This commit is contained in:
Nicolas Boichat
2017-03-08 11:24:53 -08:00
committed by chrome-bot
parent 7277708e43
commit 2a149154c4
1 changed files with 1 additions and 1 deletions
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2
board/hammer/gpio.inc
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@@ -52,7 +52,7 @@ GPIO(WP_L, PIN(A, 13), GPIO_INPUT)
/* Unimplemented signals since we are not an EC */
UNIMPLEMENTED(ENTERING_RW)
ALTERNATE(PIN_MASK(A, 0x0600), 1, MODULE_UART, 0) /* USART1: PA09/PA10 - Servo stm32 console UART */
ALTERNATE(PIN_MASK(A, 0x0600), 1, MODULE_UART, GPIO_PULL_UP) /* USART1: PA09/PA10 - Servo stm32 console UART */
ALTERNATE(PIN_MASK(B, 0x00c0), 1, MODULE_I2C, 0) /* I2C MASTER:PB6/7 GPIO_ODR_HIGH */