[tip:x86/core] acpi/bus: Enable HWP CPPC objects

[tip-bot for Srinivas Pandruvada]

Commit-ID:  5c2832e91a3ed45f35531ae1c5afba8eac22c81f
Gitweb:     http://git.kernel.org/tip/5c2832e91a3ed45f35531ae1c5afba8eac22c81f
Author:     Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
AuthorDate: Tue, 22 Nov 2016 12:23:58 -0800
Committer:  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Signed-off-by: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
Cc: linux-pm@xxxxxxxxxxxxxxx
Cc: peterz@xxxxxxxxxxxxx
Cc: jolsa@xxxxxxxxxx
Cc: rjw@xxxxxxxxxxxxx
Cc: linux-acpi@xxxxxxxxxxxxxxx
Cc: bp@xxxxxxx
Link: http://lkml.kernel.org/r/a696f6b17843cee9a542482fae6abab087be9587.1479844244.git.tim.c.chen@xxxxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

---
 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)))