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thermal: intel: int340x: Add production mode attribute 

It is possible that the system manufacturer locks down thermal tuning
beyond what is usually done on the given platform. In that case user
space calibration tools should not try to adjust the thermal
configuration of the system.

To allow user space to check if that is the case, add a new sysfs
attribute "production_mode" that will be present when the ACPI DCFG
method is present under the INT3400 device object in the ACPI Namespace.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Srinivas Pandruvada 2023-01-23 08:30:46 -08:00 committed by Rafael J. Wysocki
parent fee19c6921
commit 5c36cf2784
2 changed files with 51 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/driver-api/thermal/intel_dptf.rst
View File

@ -84,6 +84,9 @@ DPTF ACPI Drivers interface
https:/github.com/intel/thermal_daemon for decoding
thermal table.
``production_mode`` (RO)
When different from zero, manufacturer locked thermal configuration
from further changes.
ACPI Thermal Relationship table interface
------------------------------------------

48
drivers/thermal/intel/int340x_thermal/int3400_thermal.c
View File

@ -60,6 +60,7 @@ struct int3400_thermal_priv {
int odvp_count;
int *odvp;
u32 os_uuid_mask;
int production_mode;
struct odvp_attr *odvp_attrs;
};
@ -309,6 +310,44 @@ end:
return result;
}
static ssize_t production_mode_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct int3400_thermal_priv *priv = dev_get_drvdata(dev);
return sysfs_emit(buf, "%d\n", priv->production_mode);
}
static DEVICE_ATTR_RO(production_mode);
static int production_mode_init(struct int3400_thermal_priv *priv)
{
unsigned long long mode;
acpi_status status;
int ret;
priv->production_mode = -1;
status = acpi_evaluate_integer(priv->adev->handle, "DCFG", NULL, &mode);
/* If the method is not present, this is not an error */
if (ACPI_FAILURE(status))
return 0;
ret = sysfs_create_file(&priv->pdev->dev.kobj, &dev_attr_production_mode.attr);
if (ret)
return ret;
priv->production_mode = mode;
return 0;
}
static void production_mode_exit(struct int3400_thermal_priv *priv)
{
if (priv->production_mode >= 0)
sysfs_remove_file(&priv->pdev->dev.kobj, &dev_attr_production_mode.attr);
}
static ssize_t odvp_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
@ -604,8 +643,15 @@ static int int3400_thermal_probe(struct platform_device *pdev)
if (result)
goto free_sysfs;
result = production_mode_init(priv);
if (result)
goto free_notify;
return 0;
free_notify:
acpi_remove_notify_handler(priv->adev->handle, ACPI_DEVICE_NOTIFY,
int3400_notify);
free_sysfs:
cleanup_odvp(priv);
if (!ZERO_OR_NULL_PTR(priv->data_vault)) {
@ -632,6 +678,8 @@ static int int3400_thermal_remove(struct platform_device *pdev)
{
struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
production_mode_exit(priv);
acpi_remove_notify_handler(
priv->adev->handle, ACPI_DEVICE_NOTIFY,
int3400_notify);