From mboxrd@z Thu Jan 1 00:00:00 1970 From: Len Brown Subject: [PATCH 16/19] ACPI processor: introduce module parameter processor.ignore_tpc Date: Sat, 16 May 2009 02:02:13 -0400 Message-ID: <56c213fa012f2bad9eff908292ff2500f840b020.1242453625.git.len.brown@intel.com> References: <1242453736-20763-1-git-send-email-lenb@kernel.org> Return-path: Received: from vms173001pub.verizon.net ([206.46.173.1]:30755 "EHLO vms173001pub.verizon.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752453AbZEPGCf (ORCPT ); Sat, 16 May 2009 02:02:35 -0400 Received: from localhost.localdomain ([96.237.168.40]) by vms173001.mailsrvcs.net (Sun Java(tm) System Messaging Server 6.3-7.04 (built Sep 26 2008; 32bit)) with ESMTPA id <0KJQ00JYI3G2SFXC@vms173001.mailsrvcs.net> for linux-acpi@vger.kernel.org; Sat, 16 May 2009 01:02:31 -0500 (CDT) In-reply-to: <1242453736-20763-1-git-send-email-lenb@kernel.org> In-reply-to: <45cb50e646d1560eff01c5ad0f0df3c7fd6148dd.1242453625.git.len.brown@intel.com> References: <45cb50e646d1560eff01c5ad0f0df3c7fd6148dd.1242453625.git.len.brown@intel.com> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: linux-acpi@vger.kernel.org Cc: Zhang Rui , Len Brown From: Zhang Rui Introduce module parameter processor.ignore_tpc. Some laptops are shipped with buggy _TPC, this module parameter is used to to disable the buggy support. http://bugzilla.kernel.org/show_bug.cgi?id=13259 Signed-off-by: Zhang Rui Tested-by: James Ettle Signed-off-by: Len Brown --- drivers/acpi/processor_throttling.c | 17 +++++++++++++++++ 1 files changed, 17 insertions(+), 0 deletions(-) diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c index d0d1f4d..5f09fb8 100644 --- a/drivers/acpi/processor_throttling.c +++ b/drivers/acpi/processor_throttling.c @@ -45,6 +45,14 @@ #define _COMPONENT ACPI_PROCESSOR_COMPONENT ACPI_MODULE_NAME("processor_throttling"); +/* ignore_tpc: + * 0 -> acpi processor driver doesn't ignore _TPC values + * 1 -> acpi processor driver ignores _TPC values + */ +static int ignore_tpc; +module_param(ignore_tpc, int, 0644); +MODULE_PARM_DESC(ignore_tpc, "Disable broken BIOS _TPC throttling support"); + struct throttling_tstate { unsigned int cpu; /* cpu nr */ int target_state; /* target T-state */ @@ -283,6 +291,10 @@ static int acpi_processor_get_platform_limit(struct acpi_processor *pr) if (!pr) return -EINVAL; + + if (ignore_tpc) + goto end; + status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc); if (ACPI_FAILURE(status)) { if (status != AE_NOT_FOUND) { @@ -290,6 +302,8 @@ static int acpi_processor_get_platform_limit(struct acpi_processor *pr) } return -ENODEV; } + +end: pr->throttling_platform_limit = (int)tpc; return 0; } @@ -302,6 +316,9 @@ int acpi_processor_tstate_has_changed(struct acpi_processor *pr) struct acpi_processor_limit *limit; int target_state; + if (ignore_tpc) + return 0; + result = acpi_processor_get_platform_limit(pr); if (result) { /* Throttling Limit is unsupported */ -- 1.6.0.6