From: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Date: Fri, 11 Feb 2022 08:09:29 -0800
Subject: ACPI: fan: Optimize struct acpi_fan_fif
Patch-mainline: v5.18-rc1
Git-commit: d445571fa369cf08148dcd9bce563d5fae14fcd7
References: jsc#PED-1408
We don't need u64 to store the information about _FIF. There are two
booleans (fine_grain_ctrl and low_speed_notification) and one field
step_size which can take value from 1-9. There are no internal users
of revision field. So convert all fields to u8, by not directly
extracting the _FIF info the struct. Use an intermediate buffer to
extract and assign.
This will help to do u32 math using these fields. No functional
changes are expected.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Lee, Chun-Yi <jlee@suse.com>
---
drivers/acpi/fan.h | 8 ++++----
drivers/acpi/fan_core.c | 8 +++++++-
2 files changed, 11 insertions(+), 5 deletions(-)
--- a/drivers/acpi/fan.h
+++ b/drivers/acpi/fan.h
@@ -30,10 +30,10 @@ struct acpi_fan_fps {
};
struct acpi_fan_fif {
- u64 revision;
- u64 fine_grain_ctrl;
- u64 step_size;
- u64 low_speed_notification;
+ u8 revision;
+ u8 fine_grain_ctrl;
+ u8 step_size;
+ u8 low_speed_notification;
};
struct acpi_fan {
--- a/drivers/acpi/fan_core.c
+++ b/drivers/acpi/fan_core.c
@@ -211,7 +211,8 @@ static int acpi_fan_get_fif(struct acpi_
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_fan *fan = acpi_driver_data(device);
struct acpi_buffer format = { sizeof("NNNN"), "NNNN" };
- struct acpi_buffer fif = { sizeof(fan->fif), &fan->fif };
+ u64 fields[4];
+ struct acpi_buffer fif = { sizeof(fields), fields };
union acpi_object *obj;
acpi_status status;
@@ -232,6 +233,11 @@ static int acpi_fan_get_fif(struct acpi_
status = -EINVAL;
}
+ fan->fif.revision = fields[0];
+ fan->fif.fine_grain_ctrl = fields[1];
+ fan->fif.step_size = fields[2];
+ fan->fif.low_speed_notification = fields[3];
+
err:
kfree(obj);
return status;