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From: Armin Wolf <W_Armin@gmx.de>
To: rafael@kernel.org,
	lenb@kernel.org
Cc: linux-acpi@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 1/5] ACPI: bus: Indicate support for _TFP thru _OSC
Date: Sat,  9 Mar 2024 21:13:06 +0100
Message-Id: <20240309201310.7548-2-W_Armin@gmx.de>
In-Reply-To: <20240309201310.7548-1-W_Armin@gmx.de>
References: <20240309201310.7548-1-W_Armin@gmx.de>
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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 (_TF=
P) support")
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
=2D--
 drivers/acpi/bus.c   | 2 ++
 include/linux/acpi.h | 1 +
 2 files changed, 3 insertions(+)

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index d9fa730416f1..9c13a4e43fa8 100644
=2D-- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -316,6 +316,8 @@ static void acpi_bus_osc_negotiate_platform_control(vo=
id)
 		capbuf[OSC_SUPPORT_DWORD] |=3D OSC_SB_PAD_SUPPORT;
 	if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
 		capbuf[OSC_SUPPORT_DWORD] |=3D OSC_SB_PPC_OST_SUPPORT;
+	if (IS_ENABLED(CONFIG_ACPI_THERMAL))
+		capbuf[OSC_SUPPORT_DWORD] |=3D OSC_SB_FAST_THERMAL_SAMPLING_SUPPORT;

 	capbuf[OSC_SUPPORT_DWORD] |=3D OSC_SB_HOTPLUG_OST_SUPPORT;
 	capbuf[OSC_SUPPORT_DWORD] |=3D OSC_SB_PCLPI_SUPPORT;
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index a170c389dd74..7727ebbc4219 100644
=2D-- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -573,6 +573,7 @@ acpi_status acpi_run_osc(acpi_handle handle, struct ac=
pi_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
=2D-
2.39.2