From 631d77eca9fa60771ce71648e47f7918d6a2e397 Mon Sep 17 00:00:00 2001
From: Matt DeVillier <matt.devillier@gmail.com>
Date: Wed, 21 Dec 2022 14:17:54 -0600
Subject: mb/google/drallion: Implement touchscreen power sequencing
For touchscreens on drallion, 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: I6825345f35a7415020e77edf781139f0c9b5f875
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71191
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
---
src/mainboard/google/drallion/variants/drallion/gpio.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
(limited to 'src/mainboard/google')
diff --git a/src/mainboard/google/drallion/variants/drallion/gpio.c b/src/mainboard/google/drallion/variants/drallion/gpio.c
index b008427b7b..2acb35bacb 100644
--- a/src/mainboard/google/drallion/variants/drallion/gpio.c
+++ b/src/mainboard/google/drallion/variants/drallion/gpio.c
@@ -65,7 +65,7 @@ static const struct pad_config gpio_table[] = {
/* GSPI0_MOSI */ PAD_NC(GPP_B18, NONE),
/* GSPI1_CS# */ PAD_NC(GPP_B19, NONE), /* HDD_FALL_INT (nostuff) */
/* GSPI1_CLK */ PAD_NC(GPP_B20, NONE),
-/* GSPI1_MISO */ PAD_CFG_GPO(GPP_B21, 0, DEEP), /* PCH_3.3V_TS_EN */
+/* GSPI1_MISO */ PAD_CFG_GPO(GPP_B21, 1, DEEP), /* PCH_3.3V_TS_EN */
/* GSPI1_MOSI */ PAD_NC(GPP_B22, NONE),
/* SML1ALERT# */ PAD_NC(GPP_B23, DN_20K),
@@ -111,7 +111,7 @@ static const struct pad_config gpio_table[] = {
/* ISH_UART0_RXD */ PAD_CFG_NF(GPP_D13, UP_20K, DEEP, NF1),
/* ISH_CPU_UART0_TX */
/* ISH_UART0_TXD */ PAD_CFG_NF(GPP_D14, NONE, DEEP, NF1),
-/* ISH_UART0_RTS# */ PAD_CFG_GPO(GPP_D15, 0, DEEP), /* TS_RST */
+/* ISH_UART0_RTS# */ PAD_CFG_GPO(GPP_D15, 1, DEEP), /* TS_RST */
/* ISH_UART0_CTS# */ PAD_CFG_GPI(GPP_D16, NONE, PLTRST),
/* DMIC_CLK1 */ PAD_CFG_GPI(GPP_D17, NONE, PLTRST), /* KB_DET# */
/* DMIC_DATA1 */ PAD_CFG_GPI_APIC(GPP_D18, NONE, PLTRST,
@@ -249,10 +249,16 @@ const struct pad_config *variant_early_gpio_table(size_t *num)
return early_gpio_table;
}
+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_D15, 0, DEEP), /* TS_RST */
+};
+
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[] = {
--
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