Commit 5c2832e9 authored Nov 22, 2016 by Srinivas Pandruvada Committed by Thomas Gleixner Nov 24, 2016

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>

parent d3d37d85

drivers/acpi/bus.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -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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