Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751454AbaG1SfX (ORCPT ); Mon, 28 Jul 2014 14:35:23 -0400 Received: from service87.mimecast.com ([91.220.42.44]:35322 "EHLO service87.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750985AbaG1SfS convert rfc822-to-8bit (ORCPT ); Mon, 28 Jul 2014 14:35:18 -0400 Message-ID: <53D69801.9090901@arm.com> Date: Mon, 28 Jul 2014 19:35:45 +0100 From: Sudeep Holla User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: "hanjun.guo@linaro.org" , Catalin Marinas , "Rafael J. Wysocki" , Mark Rutland CC: Sudeep Holla , "graeme.gregory@linaro.org" , Arnd Bergmann , "grant.likely@linaro.org" , Will Deacon , Jason Cooper , Marc Zyngier , Bjorn Helgaas , Daniel Lezcano , Mark Brown , Robert Richter , Lv Zheng , Robert Moore , Lorenzo Pieralisi , Liviu Dudau , Randy Dunlap , Charles Garcia-Tobin , "linux-acpi@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , Al Stone Subject: Re: [PATCH 02/19] ARM64 / ACPI: Introduce early_param for "acpi" References: <1406206825-15590-1-git-send-email-hanjun.guo@linaro.org> <1406206825-15590-3-git-send-email-hanjun.guo@linaro.org> In-Reply-To: <1406206825-15590-3-git-send-email-hanjun.guo@linaro.org> X-OriginalArrivalTime: 28 Jul 2014 18:35:14.0891 (UTC) FILETIME=[AC40D1B0:01CFAA92] X-MC-Unique: 114072819351600301 Content-Type: text/plain; charset=WINDOWS-1252; format=flowed Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 24/07/14 14:00, Hanjun Guo wrote: > From: Al Stone > > Introduce two early parameters for "acpi", one is the parameter > to disable ACPI on ARM64 and another one is acpi=strict to disable > out-of-spec workarounds. > > Reviewed-by: Grant Likely > Signed-off-by: Al Stone > Signed-off-by: Graeme Gregory > Signed-off-by: Hanjun Guo > --- > Documentation/kernel-parameters.txt | 3 ++- > arch/arm64/kernel/acpi.c | 21 +++++++++++++++++++++ > 2 files changed, 23 insertions(+), 1 deletion(-) > > diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt > index b7fa2f5..d130bd5 100644 > --- a/Documentation/kernel-parameters.txt > +++ b/Documentation/kernel-parameters.txt > @@ -165,7 +165,7 @@ multipliers 'Kilo', 'Mega', and 'Giga', equalling 2^10, 2^20, and 2^30 > bytes respectively. Such letter suffixes can also be entirely omitted. > > > - acpi= [HW,ACPI,X86] > + acpi= [HW,ACPI,X86,ARM] > Advanced Configuration and Power Interface > Format: { force | off | strict | noirq | rsdt } > force -- enable ACPI if default was off > @@ -175,6 +175,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted. > strictly ACPI specification compliant. > rsdt -- prefer RSDT over (default) XSDT > copy_dsdt -- copy DSDT to memory > + For ARM64, ONLY "off" and "strict" are available. > > See also Documentation/power/runtime_pm.txt, pci=noacpi > > diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c > index c62fce6..ac78e4e 100644 > --- a/arch/arm64/kernel/acpi.c > +++ b/arch/arm64/kernel/acpi.c > @@ -74,3 +74,24 @@ void __init acpi_boot_table_init(void) > return; > } > } > + > +static int __init parse_acpi(char *arg) > +{ > + if (!arg) > + return -EINVAL; > + > + /* "acpi=off" disables both ACPI table parsing and interpreter */ > + if (strcmp(arg, "off") == 0) { > + disable_acpi(); > + } > + /* acpi=strict disables out-of-spec workarounds */ > + else if (strcmp(arg, "strict") == 0) { > + acpi_strict = 1; This should be default set as I mentioned in patch#1. We can introduce this option if required in future. Regards, Sudeep -- 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/