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: a2ee7581 ("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>

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;

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