ACPI: bus: Indicate support for more than 16 p-states thru _OSC

[ Upstream commit 6e8345f23ca37d6d41bb76be5d6a705ddf542817 ]

The code responsible for parsing the available p-states should
have no problems handling more than 16 p-states.

Indicate this by setting bit 10 ("Greater Than 16 p-state support")
when evaluating _OSC.

Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Stable-dep-of: a8a967a243d7 ("ACPI: bus: Indicate support for the Generic Event Device thru _OSC")
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 9c5fc12fc13cbce5820ada1573f66d8d489e7abb..aee91fa2a45967e8ee9d3f162d3ac0a067cad832 100644 (file)
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -321,6 +321,7 @@ static void acpi_bus_osc_negotiate_platform_control(void)
 
        capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
        capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
+       capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_OVER_16_PSTATES_SUPPORT;
        if (IS_ENABLED(CONFIG_ACPI_PRMT))
                capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PRM_SUPPORT;
        if (IS_ENABLED(CONFIG_ACPI_FFH))

diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index e4f4fb67ab55a45620899fc8efd2b2d6cd82f59f..7658d06b5bccf52c3ac35db493e714d6c297b78b 100644 (file)
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -574,6 +574,7 @@ acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context);
 #define OSC_SB_PCLPI_SUPPORT                   0x00000080
 #define OSC_SB_OSLPI_SUPPORT                   0x00000100
 #define OSC_SB_FAST_THERMAL_SAMPLING_SUPPORT   0x00000200
+#define OSC_SB_OVER_16_PSTATES_SUPPORT         0x00000400
 #define OSC_SB_CPC_DIVERSE_HIGH_SUPPORT                0x00001000
 #define OSC_SB_GENERIC_INITIATOR_SUPPORT       0x00002000
 #define OSC_SB_CPC_FLEXIBLE_ADR_SPACE          0x00004000