This is a note to let you know that I've just added the patch titled
ACPI: bus: Indicate support for more than 16 p-states thru _OSC
to the 6.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
acpi-bus-indicate-support-for-more-than-16-p-states-.patch
and it can be found in the queue-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 2d05f7e9f8f34c609ed3928fe739b37962bb53a5
Author: Armin Wolf <W_Armin@xxxxxx>
Date: Sat Mar 9 21:13:07 2024 +0100
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@xxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Stable-dep-of: a8a967a243d7 ("ACPI: bus: Indicate support for the Generic Event Device thru _OSC")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 9c5fc12fc13cb..aee91fa2a4596 100644
--- 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 e4f4fb67ab55a..7658d06b5bccf 100644
--- 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
