linux-kernel - [PATCH 1/2] acpi: Add acpi_init_properties to ACPI driver code

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Date:   Fri, 23 Jul 2021 13:21:56 -0700
From:   Michael Bottini <michael.a.bottini@...ux.intel.com>
To:     rjw@...ysocki.net, lenb@...nel.org, irenic.rajneesh@...il.com,
        david.e.box@...ux.intel.com, hdegoede@...hat.com,
        mgross@...ux.intel.com
Cc:     Michael Bottini <michael.a.bottini@...ux.intel.com>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        platform-driver-x86@...r.kernel.org
Subject: [PATCH 1/2] acpi: Add acpi_init_properties to ACPI driver code

Some products in the field, like Intel Rocket Lake systems, contain
AML code that can modify _DSD properties after they have been
evaluated by ACPI init code. Therefore, there is a need for drivers
to be able to reevaluate _DSDs so that the updated property values can
be read. Export acpi_init_properties() for this purpose.

Signed-off-by: Michael Bottini <michael.a.bottini@...ux.intel.com>
---
 drivers/acpi/property.c | 1 +
 include/linux/acpi.h    | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index e312ebaed8db..2c1f8cf1a8f0 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -432,6 +432,7 @@ void acpi_init_properties(struct acpi_device *adev)
 	if (!adev->data.pointer)
 		acpi_extract_apple_properties(adev);
 }
+EXPORT_SYMBOL(acpi_init_properties);
 
 static void acpi_destroy_nondev_subnodes(struct list_head *list)
 {
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 72e4f7fd268c..57defc3bc9b9 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -716,6 +716,8 @@ static inline u64 acpi_arch_get_root_pointer(void)
 
 int acpi_get_local_address(acpi_handle handle, u32 *addr);
 
+void acpi_init_properties(struct acpi_device *adev);
+
 #else	/* !CONFIG_ACPI */
 
 #define acpi_disabled 1
@@ -976,6 +978,10 @@ static inline int acpi_get_local_address(acpi_handle handle, u32 *addr)
 	return -ENODEV;
 }
 
+static inline void acpi_init_properties(struct acpi_device *adev)
+{
+}
+
 #endif	/* !CONFIG_ACPI */
 
 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
-- 
2.25.1