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mb/google/fatcat/var/lapis: Adjust touchpanel power on timing

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GPP_F08 -> EN_TCHSCR_PWR
GPP_F16 -> TOUCHPANEL_RESET#

Adjust touchpanel's power on timings:
1. EN_TCHSCR_PWR go high before L_VDDEN_PCH during power on
2. TOUCHPANEL_RESET# high after EN_TCHSCR_PWR high when power on

BUG=b:462913972
TEST=emerge-fatcat coreboot
the EE measured the power-on timing of the touchscreen, and it met the requirements.

Change-Id: I4e50223477003ff93d4751527196894cc0a3e781
Signed-off-by: Hualin Wei <weihualin@huaqin.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/90243
Reviewed-by: Weimin Wu <wuweimin@huaqin.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
This commit is contained in:
Hualin Wei 2025-11-27 10:45:36 +08:00 • committed by Matt DeVillier
commit 7afe1e9f9d
1 changed files with 6 additions and 2 deletions
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8
src/mainboard/google/fatcat/variants/lapis/gpio.c
View file

@ -263,8 +263,6 @@ static const struct pad_config gpio_table[] = {
PAD_NC(GPP_F06, NONE),
/* GPP_F07: Not used */
PAD_NC(GPP_F07, NONE),
/* GPP_F08: TCHSCR_PWR_EN */
PAD_CFG_GPO(GPP_F08, 1, DEEP),
/* GPP_F09: NC */
PAD_NC(GPP_F09, NONE),
/* GPP_F10: NC */
@ -398,6 +396,9 @@ static const struct pad_config early_gpio_table[] = {
/* GPP_E19: FP_PWR_EN */
PAD_CFG_GPO(GPP_E19, 1, PLTRST),
/* GPP_F16: THC0_SPI1_RST_N_TCH_PNL1 */
PAD_CFG_GPO(GPP_F16, 0, DEEP),
/* GPP_H08: UART0_BUF_RXD */
PAD_CFG_NF(GPP_H08, NONE, DEEP, NF1),
/* GPP_H09: UART0_BUF_TXD */
@ -409,6 +410,9 @@ static const struct pad_config early_gpio_table[] = {
PAD_CFG_NF(GPP_H07, NONE, DEEP, NF1),
/* GPP_E02: GSC_SOC_INT_ODL */
PAD_CFG_GPI_APIC_LOCK(GPP_E02, NONE, LEVEL, INVERT, LOCK_CONFIG),
/* GPP_F08: TCHSCR_PWR_EN */
PAD_CFG_GPO(GPP_F08, 1, DEEP),
};
/* Pad configuration in romstage */