From c41b0e8ea3b2714bf6d6d88a6b66c333c6919f07 Mon Sep 17 00:00:00 2001 From: Krishna Prasad Bhat Date: Thu, 28 Mar 2019 23:09:24 +0530 Subject: mb/google/hatch: Re-configure GPP_A12 as GPO before entering sleep GPP_A12 has a Native3 (SX_EXIT_HOLDOFF#) mode, which allows to delay resuming to S0. If this pad is not locked and platform was not initially designed for this functionality, malware could reconfigure this pads setting under OS (switch to Native3), which would make platform not able to resume until G3 is applied. To prevent misuse of this pad, re-configure this pad before entering S3 and S5 to guarantee that the pad configuration is correct. BUG=b:128686027 Change-Id: I1e7979baa491acf2c56d223afb4618f0f6429e37 Signed-off-by: Krishna Prasad Bhat Reviewed-on: https://review.coreboot.org/c/coreboot/+/32111 Tested-by: build bot (Jenkins) Reviewed-by: Furquan Shaikh --- src/mainboard/google/hatch/variants/baseboard/gpio.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'src/mainboard') diff --git a/src/mainboard/google/hatch/variants/baseboard/gpio.c b/src/mainboard/google/hatch/variants/baseboard/gpio.c index b974e49ee8..8529d5916f 100644 --- a/src/mainboard/google/hatch/variants/baseboard/gpio.c +++ b/src/mainboard/google/hatch/variants/baseboard/gpio.c @@ -411,8 +411,12 @@ const struct pad_config *__weak variant_gpio_table(size_t *num) return gpio_table; } -/* Default GPIO settings before entering sleep. */ +/* + * Default GPIO settings before entering sleep. Configure A12: FPMCU_RST_ODL + * as GPO before entering sleep. + */ static const struct pad_config default_sleep_gpio_table[] = { + PAD_CFG_GPO(GPP_A12, 1, DEEP), /* FPMCU_RST_ODL */ }; /* @@ -421,6 +425,7 @@ static const struct pad_config default_sleep_gpio_table[] = { * turn off EN_PP3300_WWAN. */ static const struct pad_config s5_sleep_gpio_table[] = { + PAD_CFG_GPO(GPP_A12, 1, DEEP), /* FPMCU_RST_ODL */ PAD_CFG_GPO(GPP_A18, 0, DEEP), /* EN_PP3300_WWAN */ }; -- cgit v1.2.3