Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752744AbaF0Dvf (ORCPT ); Thu, 26 Jun 2014 23:51:35 -0400 Received: from mail-pb0-f48.google.com ([209.85.160.48]:44500 "EHLO mail-pb0-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752721AbaF0Dvd (ORCPT ); Thu, 26 Jun 2014 23:51:33 -0400 From: Hanjun Guo To: "Rafael J. Wysocki" , Catalin Marinas , linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Arnd Bergmann , Bjorn Helgaas , rric@kernel.org, Grant Likely , Sudeep Holla , Mark Rutland , Charles.Garcia-Tobin@arm.com, lorenzo.pieralisi@arm.com, linaro-acpi@lists.linaro.org, Al Stone , Graeme Gregory , Hanjun Guo Subject: [PATCH v4 06/13] ARM64 / ACPI: Introduce early_param for "acpi" Date: Fri, 27 Jun 2014 11:49:29 +0800 Message-Id: <1403840976-7456-7-git-send-email-hanjun.guo@linaro.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1403840976-7456-1-git-send-email-hanjun.guo@linaro.org> References: <1403840976-7456-1-git-send-email-hanjun.guo@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 ++- drivers/acpi/plat/arm-core.c | 21 +++++++++++++++++++++ 2 files changed, 23 insertions(+), 1 deletion(-) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 8849049..b7e9fc0 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/drivers/acpi/plat/arm-core.c b/drivers/acpi/plat/arm-core.c index c6c7e03..cf46c25 100644 --- a/drivers/acpi/plat/arm-core.c +++ b/drivers/acpi/plat/arm-core.c @@ -108,3 +108,24 @@ 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; + } else { + /* Core will printk when we return error */ + return -EINVAL; + } + + return 0; +} +early_param("acpi", parse_acpi); -- 1.7.9.5 -- 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/