From mboxrd@z Thu Jan 1 00:00:00 1970 From: Len Brown Subject: [PATCH 3/6] ACPI: thermal: create "thermal.psv=" bootparam Date: Thu, 9 Aug 2007 01:58:53 -0400 Message-ID: <11866391391260-git-send-email-len.brown@intel.com> References: 11866388361593-git-send-email-len.brown@intel.com <11866391363162-git-send-email-len.brown@intel.com> <11866391373567-git-send-email-len.brown@intel.com> <11866391381018-git-send-email-len.brown@intel.com> Return-path: Received: from mga03.intel.com ([143.182.124.21]:23487 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759469AbXHIF7A (ORCPT ); Thu, 9 Aug 2007 01:59:00 -0400 In-Reply-To: <11866391381018-git-send-email-len.brown@intel.com> Message-Id: <95fa38b440b56d248ad09a75d1187310527e7b17.1186638234.git.len.brown@intel.com> In-Reply-To: References: Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: linux-acpi@vger.kernel.org Cc: Len Brown "thermal.psv=0" disables passive trip points for all ACPI thermal zones. "thermal.psv=C", where 'C' is degrees Celcius, overrides existing passive trip points for all ACPI thermal zones. thermal.psv is checked at module load time, and in response to trip-point change events. Note that if the system does not deliver thermal zone temperature change events near the new trip-point, then it will not be noticed. To force it to be noticed, you can enable polling: eg. thermal.tzp=3000 invokes polling every 5 minutes. Note that once passive thermal throttling is invoked, it has its own internal polling frequencey that is independent of tzp. WARNING: disabling or raising a thermal trip point will result in increased running temperature and shorter hardware lifetime on some systems. Signed-off-by: Len Brown --- Documentation/kernel-parameters.txt | 4 ++++ drivers/acpi/thermal.c | 17 ++++++++++++++--- 2 files changed, 18 insertions(+), 3 deletions(-) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 2c21ed4..9118fc6 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1823,6 +1823,10 @@ and is between 256 and 4096 characters. It is defined in the file thermal.off= [HW,ACPI] 1: disable ACPI thermal control + thermal.psv= [HW,ACPI] + 0: disable all passive trip points + : override all passive trip points to this value + thermal.tzp= [HW,ACPI] Specify global default ACPI thermal zone polling rate : poll all this frequency diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c index b6b3bec..9d7453c 100644 --- a/drivers/acpi/thermal.c +++ b/drivers/acpi/thermal.c @@ -82,6 +82,10 @@ static int off; module_param(off, int, 0); MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.\n"); +static int psv = -1; +module_param(psv, int, 0644); +MODULE_PARM_DESC(psv, "Disable or override all passive trip points.\n"); + static int acpi_thermal_add(struct acpi_device *device); static int acpi_thermal_remove(struct acpi_device *device, int type); static int acpi_thermal_resume(struct acpi_device *device); @@ -343,9 +347,16 @@ static int acpi_thermal_get_trip_points(struct acpi_thermal *tz) /* Passive: Processors (optional) */ - status = - acpi_evaluate_integer(tz->device->handle, "_PSV", NULL, - &tz->trips.passive.temperature); + if (psv == 0) { + status = AE_SUPPORT; + } else if (psv > 0) { + tz->trips.passive.temperature = psv; + status = AE_OK; + } else { + status = acpi_evaluate_integer(tz->device->handle, + "_PSV", NULL, &tz->trips.passive.temperature); + } + if (ACPI_FAILURE(status)) { tz->trips.passive.flags.valid = 0; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n")); -- 1.5.3.rc4.29.g74276