[PATCH v2 6/6] ACPI: property: Dig "rotation" property for devices with CSI2 _CRS

Rafael J. Wysocki
2023-10-20T14:49:53Z

From: Sakari Ailus <sakari.ailus@linux.intel.com>

Find the "rotation" property value for devices with _CRS CSI-2 resource
descriptors and use it to add the "rotation" property to the software
nodes representing the CSI-2 connection graph. That value typically
comes from the _PLD (Physical Location of Device) object if it is
present for the given device.

This way, camera sensor drivers that know the "rotation" property do not
need to care about _PLD on systems using ACPI.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
[ rjw: Changelog edits, file rename ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
drivers/acpi/mipi-di.c | 17 +++++++++++++++++
include/acpi/acpi_bus.h | 1 +
2 files changed, 18 insertions(+)

Index: linux-pm/drivers/acpi/mipi-di.c
===================================================================
--- linux-pm.orig/drivers/acpi/mipi-di.c
+++ linux-pm/drivers/acpi/mipi-di.c
@@ -586,6 +586,7 @@ static void init_crs_csi2_swnodes(struct
struct acpi_buffer buffer = { .length = ACPI_ALLOCATE_BUFFER };
struct acpi_device_software_nodes *swnodes = csi2->swnodes;
acpi_handle handle = csi2->handle;
+ unsigned int prop_index = 0;
struct fwnode_handle *adev_fwnode;
struct acpi_device *adev;
acpi_status status;
@@ -605,6 +606,22 @@ static void init_crs_csi2_swnodes(struct

adev_fwnode = acpi_fwnode_handle(adev);

+ /*
+ * If the "rotation" property is not present, but _PLD is there,
+ * evaluate it to get the "rotation" value.
+ */
+ if (!fwnode_property_present(adev_fwnode, "rotation")) {
+ struct acpi_pld_info *pld;
+
+ status = acpi_get_physical_device_location(handle, &pld);
+ if (ACPI_SUCCESS(status)) {
+ swnodes->dev_props[NEXT_PROPERTY(prop_index, DEV_ROTATION)] =
+ PROPERTY_ENTRY_U32("rotation",
+ pld->rotation * 45U);
+ kfree(pld);
+ }
+ }
+
status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
if (ACPI_FAILURE(status)) {
acpi_handle_info(handle, "Unable to get the path name\n");
Index: linux-pm/include/acpi/acpi_bus.h
===================================================================
--- linux-pm.orig/include/acpi/acpi_bus.h
+++ linux-pm/include/acpi/acpi_bus.h
@@ -373,6 +373,7 @@ struct acpi_gpio_mapping;
#define ACPI_DEVICE_SWNODE_PORT_NAME_LENGTH 8

enum acpi_device_swnode_dev_props {
+ ACPI_DEVICE_SWNODE_DEV_ROTATION,
ACPI_DEVICE_SWNODE_DEV_NUM_OF,
ACPI_DEVICE_SWNODE_DEV_NUM_ENTRIES
};