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| author | Hans de Goede <hdegoede@redhat.com> | 2021-11-26 18:21:09 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2021-12-08 17:34:57 +0300 |
| commit | 5f96ba56552121f4297874d0accf29b9b4a1ae93 (patch) | |
| tree | 0cbf12fc22ae7fe22ec174628935ad4b844ab268 /drivers/acpi/pmic | |
| parent | c5200609c9176482ea96ac73e52bd466b622f385 (diff) | |
| download | linux-5f96ba56552121f4297874d0accf29b9b4a1ae93.tar.xz | |
ACPI: PMIC: xpower: Fix _TMP ACPI errors
On some devices with a X-Powers AXP288 PMIC the LPAT tables in the ACPI
node for the AXP288 PMIC for some reason only describe a small temperature
range, e.g. 27° - 37° Celcius (assuming the entries are in millidegrees).
When the tablet is idle in a room at 21° degrees this is causing values
outside the LPAT table to be read, causing e.g. the following 2 errors
to get spammed to the logs every 4 seconds! :
[ 7512.791316] ACPI Error: AE_ERROR, Returned by Handler for [UserDefinedRegion] (20210930/evregion-281)
[ 7512.791611] ACPI Error: Aborting method \_SB.SXP1._TMP due to previous error (AE_ERROR) (20210930/psparse-529)
Fix this by clamping the raw value to the LPAT table range before
passing it to acpi_lpat_raw_to_temp().
Note clamping has been chosen rather then extrapolating because it is
unknown how other parts of the ACPI tables will respond to temperature
values outside of the LPAT range.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/pmic')
| -rw-r--r-- | drivers/acpi/pmic/intel_pmic_xpower.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/acpi/pmic/intel_pmic_xpower.c b/drivers/acpi/pmic/intel_pmic_xpower.c index e844bc1f3df5..61bbe4c24d87 100644 --- a/drivers/acpi/pmic/intel_pmic_xpower.c +++ b/drivers/acpi/pmic/intel_pmic_xpower.c @@ -293,12 +293,33 @@ static int intel_xpower_exec_mipi_pmic_seq_element(struct regmap *regmap, return ret; } +static int intel_xpower_lpat_raw_to_temp(struct acpi_lpat_conversion_table *lpat_table, + int raw) +{ + struct acpi_lpat first = lpat_table->lpat[0]; + struct acpi_lpat last = lpat_table->lpat[lpat_table->lpat_count - 1]; + + /* + * Some LPAT tables in the ACPI Device for the AXP288 PMIC for some + * reason only describe a small temperature range, e.g. 27° - 37° + * Celcius. Resulting in errors when the tablet is idle in a cool room. + * + * To avoid these errors clamp the raw value to be inside the LPAT. + */ + if (first.raw < last.raw) + raw = clamp(raw, first.raw, last.raw); + else + raw = clamp(raw, last.raw, first.raw); + + return acpi_lpat_raw_to_temp(lpat_table, raw); +} + static const struct intel_pmic_opregion_data intel_xpower_pmic_opregion_data = { .get_power = intel_xpower_pmic_get_power, .update_power = intel_xpower_pmic_update_power, .get_raw_temp = intel_xpower_pmic_get_raw_temp, .exec_mipi_pmic_seq_element = intel_xpower_exec_mipi_pmic_seq_element, - .lpat_raw_to_temp = acpi_lpat_raw_to_temp, + .lpat_raw_to_temp = intel_xpower_lpat_raw_to_temp, .power_table = power_table, .power_table_count = ARRAY_SIZE(power_table), .thermal_table = thermal_table, |