Messages in this thread Patch in this message | | | Date | Thu, 24 Nov 2016 11:54:21 -0800 | From | tip-bot for Srinivas Pandruvada <> | Subject | [tip:x86/core] acpi/bus: Enable HWP CPPC objects |
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Commit-ID: 5c2832e91a3ed45f35531ae1c5afba8eac22c81f Gitweb: http://git.kernel.org/tip/5c2832e91a3ed45f35531ae1c5afba8eac22c81f Author: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> AuthorDate: Tue, 22 Nov 2016 12:23:58 -0800 Committer: Thomas Gleixner <tglx@linutronix.de> CommitDate: Thu, 24 Nov 2016 20:44:20 +0100
acpi/bus: Enable HWP CPPC objects
Need to set platform wide _OSC bits to enable CPPC and CPPC version 2. If platform supports CPPC, then BIOS exposes CPPC tables.
The primary reason to enable CPPC support is to get the maximum performance of each CPU to check and enable Intel Turbo Boost Max Technology 3.0 (ITMT).
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com> Cc: linux-pm@vger.kernel.org Cc: peterz@infradead.org Cc: jolsa@redhat.com Cc: rjw@rjwysocki.net Cc: linux-acpi@vger.kernel.org Cc: bp@suse.de Link: http://lkml.kernel.org/r/a696f6b17843cee9a542482fae6abab087be9587.1479844244.git.tim.c.chen@linux.intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
--- drivers/acpi/bus.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index 56190d0..2f381ba 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -331,6 +331,13 @@ static void acpi_bus_osc_support(void) capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT; capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT; +#ifdef CONFIG_X86 + if (boot_cpu_has(X86_FEATURE_HWP)) { + capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT; + capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT; + } +#endif + if (!ghes_disable) capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT; if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
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