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Wysocki" , Len Brown , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] ACPI: processor: Use Apple-specific methods for P/C-states Date: Tue, 13 Oct 2026 06:14:30 -0400 Message-ID: <20261013101432.9712-1-atharvatiwarilinuxdev@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Use APSS and ACST instead of _PSS and _CST when available on Intel Macs. These methods are used in X86PlatformPlugin.kext, and when not found we fallback to generic _PSS and _CST methods. Signed-off-by: Atharva Tiwari --- drivers/acpi/acpi_processor.c | 22 +++++++++++++++++----- drivers/acpi/processor_perflib.c | 10 ++++++++++ 2 files changed, 27 insertions(+), 5 deletions(-) diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c index 00775b91b..37beb1a2e 100644 --- a/drivers/acpi/acpi_processor.c +++ b/drivers/acpi/acpi_processor.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include @@ -837,27 +838,38 @@ int acpi_processor_evaluate_cst(acpi_handle handle, u32 cpu, acpi_status status; u64 count; int last_index = 0; - int i, ret = 0; + int i, ret = 0, base = 0; + if (x86_apple_machine) { + status = acpi_evaluate_object(handle, "ACST", NULL, &buffer); + if (ACPI_SUCCESS(status)) { + base = 1; /* ACST is a 4 field variable we need to skip the first field */ + goto success; + } + + buffer.length = ACPI_ALLOCATE_BUFFER; + buffer.pointer = NULL; + } status = acpi_evaluate_object(handle, "_CST", NULL, &buffer); if (ACPI_FAILURE(status)) { acpi_handle_debug(handle, "No _CST\n"); return -ENODEV; } +success: cst = buffer.pointer; /* There must be at least 2 elements. */ - if (!cst || cst->type != ACPI_TYPE_PACKAGE || cst->package.count < 2) { + if (!cst || cst->type != ACPI_TYPE_PACKAGE || cst->package.count < base + 2) { acpi_handle_warn(handle, "Invalid _CST output\n"); ret = -EFAULT; goto end; } - count = cst->package.elements[0].integer.value; + count = cst->package.elements[base].integer.value; /* Validate the number of C-states. */ - if (count < 1 || count != cst->package.count - 1) { + if (count < 1 || count != cst->package.count - 1 - base) { acpi_handle_warn(handle, "Inconsistent _CST data\n"); ret = -EFAULT; goto end; @@ -882,7 +894,7 @@ int acpi_processor_evaluate_cst(acpi_handle handle, u32 cpu, memset(&cx, 0, sizeof(cx)); - element = &cst->package.elements[i]; + element = &cst->package.elements[base + i]; if (element->type != ACPI_TYPE_PACKAGE) { acpi_handle_info(handle, "_CST C%d type(%x) is not package, skip...\n", i, element->type); diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c index fdf55c285..4b9e17d65 100644 --- a/drivers/acpi/processor_perflib.c +++ b/drivers/acpi/processor_perflib.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #ifdef CONFIG_X86 #include @@ -323,11 +324,20 @@ static int acpi_processor_get_performance_states(struct acpi_processor *pr) int i; int last_invalid = -1; + if (x86_apple_machine) { + status = acpi_evaluate_object(pr->handle, "APSS", NULL, &buffer); + if (ACPI_SUCCESS(status)) + goto success; + + buffer.length = ACPI_ALLOCATE_BUFFER; + buffer.pointer = NULL; + } status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); if (ACPI_FAILURE(status)) { acpi_evaluation_failure_warn(pr->handle, "_PSS", status); return -ENODEV; } +success: pss = buffer.pointer; if (!pss || pss->type != ACPI_TYPE_PACKAGE) { -- 2.55.0