Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752821AbaKXHwT (ORCPT ); Mon, 24 Nov 2014 02:52:19 -0500 Received: from userp1040.oracle.com ([156.151.31.81]:22590 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752176AbaKXHwR (ORCPT ); Mon, 24 Nov 2014 02:52:17 -0500 From: Ethan Zhao To: linda.knippers@hp.com, viresh.kumar@linaro.org, rjw@rjwysocki.net, corbet@lwn.net, dirk.j.brandewie@intel.com Cc: linux-doc@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, ethan.kernel@gmail.com, Ethan Zhao Subject: [PATCH 1/2 v2] intel_pstate: skip this driver if Sun server has _PPC method Date: Mon, 24 Nov 2014 16:50:57 +0900 Message-Id: <1416815458-25312-2-git-send-email-ethan.zhao@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1416815458-25312-1-git-send-email-ethan.zhao@oracle.com> References: <1416815458-25312-1-git-send-email-ethan.zhao@oracle.com> X-Source-IP: acsinet22.oracle.com [141.146.126.238] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Oracle Sun X86 servers have dynamic power capping capability that works via ACPI _PPC method etc, so skip loading this driver if Sun server has ACPI _PPC enabled. Signed-off-by: Ethan Zhao v2: only match ORACLE oem id. --- drivers/cpufreq/intel_pstate.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 27bb6d3..dacc15a 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -943,6 +943,21 @@ static bool intel_pstate_no_acpi_pss(void) return true; } +static bool intel_pstate_has_acpi_ppc(void) +{ + int i; + + for_each_possible_cpu(i) { + struct acpi_processor *pr = per_cpu(processors, i); + + if (!pr) + continue; + if (acpi_has_method(pr->handle, "_PPC")) + return true; + } + return false; +} + struct hw_vendor_info { u16 valid; char oem_id[ACPI_OEM_ID_SIZE]; @@ -952,6 +967,7 @@ struct hw_vendor_info { /* Hardware vendor-specific info that has its own power management modes */ static struct hw_vendor_info vendor_info[] = { {1, "HP ", "ProLiant"}, + {1, "ORACLE", ""}, {0, "", ""}, }; @@ -970,11 +986,15 @@ static bool intel_pstate_platform_pwr_mgmt_exists(void) intel_pstate_no_acpi_pss()) return true; } + if (!strncmp(hdr.oem_id, vendor_info[1].oem_id, ACPI_OEM_ID_SIZE) && + intel_pstate_has_acpi_ppc()) + return true; return false; } #else /* CONFIG_ACPI not enabled */ static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; } +static inline bool intel_pstate_has_acpi_ppc(void) { return false; } #endif /* CONFIG_ACPI */ static int __init intel_pstate_init(void) -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/