mb/google/galdos/var/lars: Implement touchscreen power sequencing
Since lars has two touchscreen options, we need to determine which (if
any) are present on a given device at runtime so that there are not
multiple ACPI touchscreen devices (as it makes Windows unhappy).
Implement power sequencing and runtime detection for both touchscreen
options.
TEST=build/boot Win11/Linux on google/lars, verify touchscreen detected
and functional under both OSes.
Change-Id: I49ccb29ec4589315a4abe3c0ea8fa76f97080bcd
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79311
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <ericllai@google.com>
diff --git a/src/mainboard/google/glados/variants/lars/include/variant/gpio.h b/src/mainboard/google/glados/variants/lars/include/variant/gpio.h
index 5ff059b..611ee24 100644
--- a/src/mainboard/google/glados/variants/lars/include/variant/gpio.h
+++ b/src/mainboard/google/glados/variants/lars/include/variant/gpio.h
@@ -216,6 +216,10 @@
/* GD_UART2_RXD */ PAD_CFG_NF(GPP_C20, NONE, DEEP, NF1),
/* GD_UART2_TXD */ PAD_CFG_NF(GPP_C21, NONE, DEEP, NF1),
/* EC_IN_RW */ PAD_CFG_GPI_GPIO_DRIVER(GPP_C6, NONE, DEEP),
+
+/* touchscreen enable, hold in reset */
+/* TCH_PNL_PWREN */ PAD_CFG_GPO(GPP_C22, 1, DEEP),
+/* TCH_PNL_RST */ PAD_CFG_GPO(GPP_E23, 0, DEEP),
};
#endif
diff --git a/src/mainboard/google/glados/variants/lars/overridetree.cb b/src/mainboard/google/glados/variants/lars/overridetree.cb
index 717ea53..2616044 100644
--- a/src/mainboard/google/glados/variants/lars/overridetree.cb
+++ b/src/mainboard/google/glados/variants/lars/overridetree.cb
@@ -18,12 +18,24 @@
register "hid" = ""ELAN0001""
register "desc" = ""ELAN Touchscreen""
register "irq" = "ACPI_IRQ_EDGE_LOW(GPP_E7_IRQ)"
+ register "detect" = "1"
+ register "reset_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_LOW(GPP_E7)"
+ register "reset_delay_ms" = "20"
+ register "enable_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_HIGH(GPP_E23)"
+ register "enable_delay_ms" = "1"
+ register "has_power_resource" = "1"
device i2c 10 on end
end
chip drivers/i2c/generic
register "hid" = ""MLFS0000""
register "desc" = ""Melfas Touchscreen""
register "irq" = "ACPI_IRQ_EDGE_LOW(GPP_E7_IRQ)"
+ register "detect" = "1"
+ register "reset_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_LOW(GPP_E7)"
+ register "reset_delay_ms" = "10"
+ register "enable_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_HIGH(GPP_E23)"
+ register "enable_delay_ms" = "55"
+ register "has_power_resource" = "1"
device i2c 34 on end
end
end