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From: Armin Wolf <W_Armin@gmx.de>
To: rafael@kernel.org, rui.zhang@intel.com
Cc: lenb@kernel.org, linux-acpi@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 1/3] ACPI: OSI: Stop advertising support for "3.0 _SCP Extensions"
Date: Thu, 10 Apr 2025 18:54:54 +0200	[thread overview]
Message-ID: <20250410165456.4173-2-W_Armin@gmx.de> (raw)
In-Reply-To: <20250410165456.4173-1-W_Armin@gmx.de>

As specified in section 5.7.2 of the ACPI specification the feature
group string "3.0 _SCP Extensions" implies that the operating system
evaluates the _SCP control method with additional parameters.

However the ACPI thermal driver evaluates the _SCP control method
without those additional parameters, conflicting with the above
feature group string advertised to the firmware thru _OSI.

Stop advertising support for this feature string to avoid confusing
the ACPI firmware.

Fixes: e5f660ebef68 ("ACPI / osi: Collect _OSI handling into one single file")
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
---
 drivers/acpi/osi.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/acpi/osi.c b/drivers/acpi/osi.c
index df9328c850bd..f2c943b934be 100644
--- a/drivers/acpi/osi.c
+++ b/drivers/acpi/osi.c
@@ -42,7 +42,6 @@ static struct acpi_osi_entry
 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
 	{"Module Device", true},
 	{"Processor Device", true},
-	{"3.0 _SCP Extensions", true},
 	{"Processor Aggregator Device", true},
 };

--
2.39.5


  reply	other threads:[~2025-04-10 16:55 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-04-10 16:54 [PATCH 0/3] ACPI: thermal: Properly support the _SCP control method Armin Wolf
2025-04-10 16:54 ` Armin Wolf [this message]
2025-04-10 16:54 ` [PATCH 2/3] ACPI: thermal: Execute _SCP before reading trip points Armin Wolf
2025-04-10 16:54 ` [PATCH 3/3] ACPI: thermal: Allow userspace applications to change the cooling mode Armin Wolf
2025-04-25 23:20 ` [PATCH 0/3] ACPI: thermal: Properly support the _SCP control method Armin Wolf
2025-04-26 13:12   ` Rafael J. Wysocki
2025-04-26 22:52     ` Armin Wolf
2025-04-28 12:31       ` Armin Wolf
2025-04-28 12:34         ` Rafael J. Wysocki
2025-05-02 22:29           ` Armin Wolf
2025-05-16 13:59             ` Rafael J. Wysocki
2025-05-16 16:56               ` Rafael J. Wysocki
2025-05-16 22:51                 ` Armin Wolf
2025-05-16 23:01               ` Armin Wolf

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