ACPI: Enable FPDT on arm64

FPDT provides some boot timing records useful for analyzing
parts of the UEFI boot stack. Given the existing code works
on arm64, and allows reading the values without utilizing
/dev/mem it seems like a good idea to turn it on.

Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Link: https://lore.kernel.org/r/20221109174720.203723-1-jeremy.linton@arm.com
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/Documentation/arm64/acpi_object_usage.rst b/Documentation/arm64/acpi_object_usage.rst
index 0609da7..484ef96 100644 (file)
--- a/Documentation/arm64/acpi_object_usage.rst
+++ b/Documentation/arm64/acpi_object_usage.rst
@@ -163,7 +163,7 @@ FPDT   Section 5.2.23 (signature == "FPDT")
 
        **Firmware Performance Data Table**
 
-       Optional, not currently supported.
+       Optional, useful for boot performance profiling.
 
 GTDT   Section 5.2.24 (signature == "GTDT")
 

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 473241b..1cc11d2 100644 (file)
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -90,7 +90,7 @@ config ACPI_SPCR_TABLE
 
 config ACPI_FPDT
        bool "ACPI Firmware Performance Data Table (FPDT) support"
-       depends on X86_64
+       depends on X86_64 || ARM64
        help
          Enable support for the Firmware Performance Data Table (FPDT).
          This table provides information on the timing of the system