ACPI: bus: Indicate support for _TFP thru _OSC

The ACPI thermal driver already uses the _TPF ACPI method to retrieve
precise sampling time values, but this is not reported thru _OSC.

Fix this by setting bit 9 ("Fast Thermal Sampling support") when
evaluating _OSC.

Fixes: a2ee7581afd5 ("ACPI: thermal: Add Thermal fast Sampling Period (_TFP) support")
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index d9fa730416f1910b03ab07dfe7145db5acf5b0eb..9c13a4e43fa826c59d8103d9b2cb1f87667c63d9 100644 (file)
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -316,6 +316,8 @@ static void acpi_bus_osc_negotiate_platform_control(void)
                capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
        if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
                capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
+       if (IS_ENABLED(CONFIG_ACPI_THERMAL))
+               capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_FAST_THERMAL_SAMPLING_SUPPORT;
 
        capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
        capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;

diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 34829f2c517ac278e1655c5a646bbbfbe051506b..51bdd9e08f6dac8dc2feda234c813438a6fd9ba2 100644 (file)
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -573,6 +573,7 @@ acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context);
 #define OSC_SB_CPCV2_SUPPORT                   0x00000040
 #define OSC_SB_PCLPI_SUPPORT                   0x00000080
 #define OSC_SB_OSLPI_SUPPORT                   0x00000100
+#define OSC_SB_FAST_THERMAL_SAMPLING_SUPPORT   0x00000200
 #define OSC_SB_CPC_DIVERSE_HIGH_SUPPORT                0x00001000
 #define OSC_SB_GENERIC_INITIATOR_SUPPORT       0x00002000
 #define OSC_SB_CPC_FLEXIBLE_ADR_SPACE          0x00004000