linuxmsm/laptops-kernel
0
0
Fork 0
mirror of https://github.com/linux-msm/laptops-kernel.git synced 2026-08-13 14:19:53 -07:00
Code Issues Packages Projects Releases Wiki Activity

ACPI: processor: idle: Add switch for strict _LPI processing

Browse Source 
Add a "strict" argument to acpi_processor_extract_lpi_info() that, when
set, will cause it to ignore _LPI states without minimum residency or
wake latency instead of assuming 10 us values for these parameters.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Sudeep Holla <sudeep.holla@kernel.org>
Acked-by: Huisong Li <lihuisong@huawei.com>
Link: https://patch.msgid.link/3896986.MHq7AAxBmi@rafael.j.wysocki
This commit is contained in:
Rafael J. Wysocki
2026-07-17 11:10:09 +02:00
parent c60e851f9c
commit 67fcf679c8
3 changed files with 24 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/acpi/acpi_processor.c
+19 -6
View File
@@ -1018,7 +1018,7 @@ static int obj_get_integer(union acpi_object *obj, u32 *value)
static void process_lpi_state_package(union acpi_object *lpi_pkg,
struct acpi_lpi_state *lpi_state,
acpi_handle handle,
unsigned int state_idx)
unsigned int state_idx, bool strict)
{
union acpi_object *lpi_pkg_elem, *obj;
@@ -1054,11 +1054,21 @@ static void process_lpi_state_package(union acpi_object *lpi_pkg,
}
if (obj_get_integer(&lpi_pkg_elem[0], &lpi_state->min_residency)) {
if (strict) {
lpi_state_debug(handle, "No min. residency", state_idx);
return;
}
lpi_state_debug(handle, "Assuming 10 us min. residency", state_idx);
lpi_state->min_residency = 10;
}
if (obj_get_integer(&lpi_pkg_elem[1], &lpi_state->wake_latency)) {
if (strict) {
lpi_state_debug(handle, "No wake latency", state_idx);
return;
}
lpi_state_debug(handle, "Assuming 10 us wake latency", state_idx);
lpi_state->wake_latency = 10;
}
@@ -1090,7 +1100,8 @@ static void process_lpi_state_package(union acpi_object *lpi_pkg,
}
static int acpi_processor_evaluate_lpi(acpi_handle handle,
struct acpi_lpi_states_array *info)
struct acpi_lpi_states_array *info,
bool strict)
{
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *lpi_data, *lpi_pkg;
@@ -1138,7 +1149,8 @@ static int acpi_processor_evaluate_lpi(acpi_handle handle,
for (state_idx = 1; state_idx <= lpi_pkg_count; state_idx++) {
lpi_state->index = state_idx;
process_lpi_state_package(lpi_pkg++, lpi_state++, handle, state_idx);
process_lpi_state_package(lpi_pkg++, lpi_state++, handle,
state_idx, strict);
}
acpi_handle_debug(handle, "Found %u power states\n", lpi_pkg_count);
@@ -1245,7 +1257,8 @@ static unsigned int flatten_lpi_states(acpi_handle handle,
}
int acpi_processor_extract_lpi_info(acpi_handle pr_handle,
struct acpi_processor_power *pr_power)
struct acpi_processor_power *pr_power,
bool strict)
{
struct acpi_lpi_states_array info[2], *prev, *curr;
acpi_handle handle = pr_handle;
@@ -1259,7 +1272,7 @@ int acpi_processor_extract_lpi_info(acpi_handle pr_handle,
curr = &info[0];
curr->composite_states_size = 0;
ret = acpi_processor_evaluate_lpi(handle, curr);
ret = acpi_processor_evaluate_lpi(handle, curr, strict);
if (ret)
return ret;
@@ -1312,7 +1325,7 @@ int acpi_processor_extract_lpi_info(acpi_handle pr_handle,
curr->composite_states_size = 0;
ret = acpi_processor_evaluate_lpi(handle, curr);
ret = acpi_processor_evaluate_lpi(handle, curr, strict);
if (ret)
break;
drivers/acpi/processor_idle.c
+1 -1
View File
@@ -867,7 +867,7 @@ static int acpi_processor_get_lpi_info(struct acpi_processor *pr)
if (ret == -EOPNOTSUPP)
return ret;
ret = acpi_processor_extract_lpi_info(pr->handle, &pr->power);
ret = acpi_processor_extract_lpi_info(pr->handle, &pr->power, false);
if (ret)
return ret;
include/linux/acpi.h
+4 -2
View File
@@ -317,10 +317,12 @@ static inline int acpi_processor_evaluate_cst(acpi_handle handle, u32 cpu,
#ifdef CONFIG_ACPI_PROCESSOR_IDLE
int acpi_processor_extract_lpi_info(acpi_handle pr_handle,
struct acpi_processor_power *pr_power);
struct acpi_processor_power *pr_power,
bool strict);
#else
static inline int acpi_processor_extract_lpi_info(acpi_handle pr_handle,
struct acpi_processor_power *pr_power)
struct acpi_processor_power *pr_power,
bool strict)
{
return -ENODEV;
}