From: Mario Limonciello <mario.limonciello@amd.com>
To: <mario.limonciello@amd.com>,
"Rafael J. Wysocki" <rafael@kernel.org>,
"Len Brown" <lenb@kernel.org>,
Pierre Gondois <pierre.gondois@arm.com>,
"Sudeep Holla" <sudeep.holla@arm.com>
Cc: Perry Yuan <perry.yuan@amd.com>, <linux-acpi@vger.kernel.org>,
<linux-kernel@vger.kernel.org>
Subject: [PATCH] ACPI: CPPC: Don't require _OSC if X86_FEATURE_CPPC is supported
Date: Mon, 27 Jun 2022 11:58:32 -0500 [thread overview]
Message-ID: <20220627165832.10246-1-mario.limonciello@amd.com> (raw)
commit 72f2ecb7ece7 ("ACPI: bus: Set CPPC _OSC bits for all and
when CPPC_LIB is supported") added support for claiming to
support CPPC in _OSC on non-Intel platforms.
This unfortunately caused a regression on a vartiety of AMD
platforms in the field because a number of AMD platforms don't set
the `_OSC` bit 5 or 6 to indicate CPPC or CPPC v2 support.
As these AMD platforms already claim CPPC support via `X86_FEATURE_CPPC`,
use this enable this feature rather than requiring the `_OSC`.
Fixes: 72f2ecb7ece7 ("Set CPPC _OSC bits for all and when CPPC_LIB is supported")
Reported-by: Perry Yuan <perry.yuan@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
drivers/acpi/cppc_acpi.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index 903528f7e187..5463e6309b9a 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -629,6 +629,15 @@ static bool is_cppc_supported(int revision, int num_ent)
return false;
}
+ if (osc_sb_cppc_not_supported) {
+ pr_debug("Firmware missing _OSC support\n");
+#ifdef CONFIG_X86
+ return boot_cpu_has(X86_FEATURE_CPPC);
+#else
+ return false;
+#endif
+ }
+
return true;
}
@@ -684,9 +693,6 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr)
acpi_status status;
int ret = -ENODATA;
- if (osc_sb_cppc_not_supported)
- return -ENODEV;
-
/* Parse the ACPI _CPC table for this CPU. */
status = acpi_evaluate_object_typed(handle, "_CPC", NULL, &output,
ACPI_TYPE_PACKAGE);
--
2.34.1
next reply other threads:[~2022-06-27 16:58 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-27 16:58 Mario Limonciello [this message]
2022-06-27 17:26 ` [PATCH] ACPI: CPPC: Don't require _OSC if X86_FEATURE_CPPC is supported Yuan, Perry
2022-06-29 18:41 ` Rafael J. Wysocki
2022-06-29 18:48 ` Limonciello, Mario
2022-06-29 19:09 ` Rafael J. Wysocki
2022-06-29 19:38 ` Limonciello, Mario
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