linux-kernel - [PATCH 2/5] ACPI: bus: Indicate support for more than 16 p-states thru

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Date: Sat,  9 Mar 2024 21:13:07 +0100
From: Armin Wolf <W_Armin@....de>
To: rafael@...nel.org,
	lenb@...nel.org
Cc: linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/5] ACPI: bus: Indicate support for more than 16 p-states thru _OSC

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@....de>
---
 drivers/acpi/bus.c   | 1 +
 include/linux/acpi.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 9c13a4e43fa8..d5b0e80dc48e 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 7727ebbc4219..baa07b5a717f 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
--
2.39.2