Change in coreboot[master]: mb/google/octopus: Enable pull on ESPI_IO1 line

[Furquan Shaikh (Code Review)]

Furquan Shaikh has uploaded this change for review. ( https://review.coreboot.org/25900

Change subject: mb/google/octopus: Enable pull on ESPI_IO1 line
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mb/google/octopus: Enable pull on ESPI_IO1 line

This change configures a weak internal pull-up on ESPI_IO1 line for
octopus baseboard and variant bip. ESPI_IO1 is used as ALERT# line and
is expected to be open-drain. However, there is no external pull on
this line and so an internal pull-up is required to ensure proper eSPI
communication.

BUG=b:78497502
TEST=Verified that there is no eSPI communication failure between AP
and EC during boot-up and on suspend/resume.

Change-Id: Ic494aa7397b94bfd233ce10da8287660997b3377
Signed-off-by: Furquan Shaikh 
---
M src/mainboard/google/octopus/variants/baseboard/gpio.c
M src/mainboard/google/octopus/variants/bip/gpio.c
2 files changed, 16 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/00/25900/1

diff --git a/src/mainboard/google/octopus/variants/baseboard/gpio.c b/src/mainboard/google/octopus/variants/baseboard/gpio.c
index 8863bbb..732653a 100644
--- a/src/mainboard/google/octopus/variants/baseboard/gpio.c
+++ b/src/mainboard/google/octopus/variants/baseboard/gpio.c
@@ -279,6 +279,14 @@
    /* Enable power to wifi early in bootblock and de-assert PERST#. */
    PAD_CFG_GPO(GPIO_178, 1, DEEP), /* EN_PP3300_WLAN */
    PAD_CFG_GPO(GPIO_164, 0, DEEP), /* WLAN_PE_RST */
+
+	/*
+	 * ESPI_IO1 acts as ALERT# (which is open-drain) and requies a weak
+	 * pull-up for proper operation. Since there is no external pull present
+	 * on this platform, configure an internal weak pull-up.
+	 */
+	PAD_CFG_NF_IOSSTATE_IOSTERM(GPIO_151, UP_20K, DEEP, NF2, HIZCRx1,
+				    ENPU), /* ESPI_IO1 */
 };

const struct pad_config *__weak
diff --git a/src/mainboard/google/octopus/variants/bip/gpio.c b/src/mainboard/google/octopus/variants/bip/gpio.c
index fe7a2e2..84285d7 100644
--- a/src/mainboard/google/octopus/variants/bip/gpio.c
+++ b/src/mainboard/google/octopus/variants/bip/gpio.c
@@ -278,6 +278,14 @@
    /* Enable power to wifi early in bootblock and de-assert PERST#. */
    PAD_CFG_GPO(GPIO_178, 1, DEEP), /* EN_PP3300_WLAN */
    PAD_CFG_GPO(GPIO_164, 0, DEEP), /* WLAN_PE_RST */
+
+	/*
+	 * ESPI_IO1 acts as ALERT# (which is open-drain) and requies a weak
+	 * pull-up for proper operation. Since there is no external pull present
+	 * on this platform, configure an internal weak pull-up.
+	 */
+	PAD_CFG_NF_IOSSTATE_IOSTERM(GPIO_151, UP_20K, DEEP, NF2, HIZCRx1,
+				    ENPU), /* ESPI_IO1 */
 };

const struct pad_config *variant_early_gpio_table(size_t *num)