From 8d728c2090614511a0586194bccc30d1e628fe0a Mon Sep 17 00:00:00 2001 From: Stanley Wu Date: Tue, 13 Dec 2022 16:58:26 +0800 Subject: [PATCH] mb/google/nissa/var/pujjo: Modify WWAN warm reset sequence pujjo support FM101 WWAN, add delay of FCPO# to meet warm reset toff minimum 500ms requirement. BUG=b:260380268 TEST=Build and boot on pujjo Signed-off-by: Stanley Wu Change-Id: I63e599e76bd8a15ca44717823411576fa4df1c26 Reviewed-on: https://review.coreboot.org/c/coreboot/+/70720 Tested-by: build bot (Jenkins) Reviewed-by: Reka Norman --- src/mainboard/google/brya/variants/pujjo/gpio.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/src/mainboard/google/brya/variants/pujjo/gpio.c b/src/mainboard/google/brya/variants/pujjo/gpio.c index 390ff166af..f104b92e25 100644 --- a/src/mainboard/google/brya/variants/pujjo/gpio.c +++ b/src/mainboard/google/brya/variants/pujjo/gpio.c @@ -33,8 +33,14 @@ static const struct pad_config override_gpio_table[] = { static const struct pad_config early_gpio_table[] = { /* A13 : GPP_A13 ==> GSC_SOC_INT_ODL */ PAD_CFG_GPI_APIC(GPP_A13, NONE, PLTRST, LEVEL, INVERT), + /* + * WWAN_EN is asserted in ramstage to meet the 500 ms warm reset toff + * requirement. WWAN_EN must be asserted before WWAN_RST_L is released + * (with min delay 0 ms), so this works as long as the pin used for + * WWAN_EN comes before the pin used for WWAN_RST_L. + */ /* D6 : SRCCLKREQ1# ==> WWAN_EN */ - PAD_CFG_GPO(GPP_D6, 1, DEEP), + PAD_CFG_GPO(GPP_D6, 0, DEEP), /* E12 : THC0_SPI1_IO1 ==> SOC_WP_OD */ PAD_CFG_GPI_GPIO_DRIVER(GPP_E12, NONE, DEEP), /* F12 : WWAN_RST_L */