[PATCH v1 1/2] platform/x86: int3472: add hpd pin support

Dongcheng Yan
2025-04-11T08:24:14Z

Typically HDMI to MIPI CSI-2 bridges have a pin to signal image data is
being received. On the host side this is wired to a GPIO for polling or
interrupts. This includes the Lontium HDMI to MIPI CSI-2 bridges
lt6911uxe and lt6911uxc.

The GPIO "hpd" is used already by other HDMI to CSI-2 bridges, use it
here as well.

Signed-off-by: Dongcheng Yan <dongcheng.yan@intel.com>
---
drivers/platform/x86/intel/int3472/common.h | 1 +
drivers/platform/x86/intel/int3472/discrete.c | 6 ++++++
2 files changed, 7 insertions(+)

diff --git a/drivers/platform/x86/intel/int3472/common.h b/drivers/platform/x86/intel/int3472/common.h
index 145dec66df64..db4cd3720e24 100644
--- a/drivers/platform/x86/intel/int3472/common.h
+++ b/drivers/platform/x86/intel/int3472/common.h
@@ -22,6 +22,7 @@
#define INT3472_GPIO_TYPE_POWER_ENABLE 0x0b
#define INT3472_GPIO_TYPE_CLK_ENABLE 0x0c
#define INT3472_GPIO_TYPE_PRIVACY_LED 0x0d
+#define INT3472_GPIO_TYPE_HOTPLUG_DETECT 0x13

#define INT3472_PDEV_MAX_NAME_LEN 23
#define INT3472_MAX_SENSOR_GPIOS 3
diff --git a/drivers/platform/x86/intel/int3472/discrete.c b/drivers/platform/x86/intel/int3472/discrete.c
index 30ff8f3ea1f5..28d41b1b3809 100644
--- a/drivers/platform/x86/intel/int3472/discrete.c
+++ b/drivers/platform/x86/intel/int3472/discrete.c
@@ -186,6 +186,10 @@ static void int3472_get_con_id_and_polarity(struct acpi_device *adev, u8 *type,
*con_id = "privacy-led";
*gpio_flags = GPIO_ACTIVE_HIGH;
break;
+ case INT3472_GPIO_TYPE_HOTPLUG_DETECT:
+ *con_id = "hpd";
+ *gpio_flags = GPIO_LOOKUP_FLAGS_DEFAULT;
+ break;
case INT3472_GPIO_TYPE_POWER_ENABLE:
*con_id = "power-enable";
*gpio_flags = GPIO_ACTIVE_HIGH;
@@ -212,6 +216,7 @@ static void int3472_get_con_id_and_polarity(struct acpi_device *adev, u8 *type,
* 0x0b Power enable
* 0x0c Clock enable
* 0x0d Privacy LED
+ * 0x13 Hotplug detect
*
* There are some known platform specific quirks where that does not quite
* hold up; for example where a pin with type 0x01 (Power down) is mapped to
@@ -281,6 +286,7 @@ static int skl_int3472_handle_gpio_resources(struct acpi_resource *ares,
switch (type) {
case INT3472_GPIO_TYPE_RESET:
case INT3472_GPIO_TYPE_POWERDOWN:
+ case INT3472_GPIO_TYPE_HOTPLUG_DETECT:
ret = skl_int3472_map_gpio_to_sensor(int3472, agpio, con_id, gpio_flags);
if (ret)
err_msg = "Failed to map GPIO pin to sensor\n";

base-commit: 01c6df60d5d4ae00cd5c1648818744838bba7763
--
2.34.1