From b4bf865359fe084b46021fadfd0867a3649b92bf Mon Sep 17 00:00:00 2001 From: Matt DeVillier Date: Thu, 23 Feb 2023 19:24:38 -0600 Subject: mb/google/sarien: Implement touchscreen power sequencing For touchscreens on sarien, drive the enable GPIO high starting in romstage while holding in reset, then disable the reset GPIO in ramstage. This will allow coreboot to detect the presence of i2c touchscreens during ACPI SSDT generation (implemented in a subsequent commit). BUG=b:121309055 TEST=tested with rest of patch train Change-Id: I3ce7bfc0fa4c03c0bb96bebaa3c3d256f886ecc4 Signed-off-by: Matt DeVillier Reviewed-on: https://review.coreboot.org/c/coreboot/+/74237 Tested-by: build bot (Jenkins) Reviewed-by: Eric Lai --- src/mainboard/google/sarien/variants/arcada/gpio.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) (limited to 'src/mainboard/google/sarien/variants/arcada') diff --git a/src/mainboard/google/sarien/variants/arcada/gpio.c b/src/mainboard/google/sarien/variants/arcada/gpio.c index 63df675036..45aed5f219 100644 --- a/src/mainboard/google/sarien/variants/arcada/gpio.c +++ b/src/mainboard/google/sarien/variants/arcada/gpio.c @@ -242,6 +242,12 @@ static const struct pad_config early_gpio_table[] = { /* M2_SKT2_CFG0 */ PAD_CFG_GPO(GPP_H12, 1, DEEP), /* D3 cold RST */ }; +static const struct pad_config romstage_gpio_table[] = { + /* Enable touchscreen, hold in reset */ + PAD_CFG_GPO(GPP_B21, 1, DEEP), /* PCH_3.3V_TS_EN */ + PAD_CFG_GPO(GPP_E7, 0, DEEP), /* TOUCH_SCREEN_PD# */ +}; + const struct pad_config *variant_gpio_table(size_t *num) { *num = ARRAY_SIZE(gpio_table); @@ -256,8 +262,8 @@ const struct pad_config *variant_early_gpio_table(size_t *num) const struct pad_config *variant_romstage_gpio_table(size_t *num) { - *num = 0; - return NULL; + *num = ARRAY_SIZE(romstage_gpio_table); + return romstage_gpio_table; } static const struct cros_gpio cros_gpios[] = { -- cgit v1.2.3