linux-kernel - [PATCH v3 6/7] ACPI: property: Dig "rotation" property for devices with CSI2

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Date:   Mon, 06 Nov 2023 17:28:40 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux ACPI <linux-acpi@...r.kernel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH v3 6/7] ACPI: property: Dig "rotation" property for devices with CSI2 _CRS

From: Sakari Ailus <sakari.ailus@...ux.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@...ux.intel.com>
[ rjw: Changelog edits, file rename ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---

v2 -> v3:
   * Change the name of the new file to mipi-disco-img.c

---
 drivers/acpi/mipi-disco-img.c |   17 +++++++++++++++++
 include/acpi/acpi_bus.h       |    1 +
 2 files changed, 18 insertions(+)

Index: linux-pm/drivers/acpi/mipi-disco-img.c
===================================================================
--- linux-pm.orig/drivers/acpi/mipi-disco-img.c
+++ linux-pm/drivers/acpi/mipi-disco-img.c
@@ -592,6 +592,7 @@ 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;
@@ -611,6 +612,22 @@ 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
@@ -380,6 +380,7 @@ 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
 };