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Date: Thu, 24 Jul 2014 21:00:08 +0800 From: Hanjun Guo <hanjun.guo@...aro.org> To: Catalin Marinas <catalin.marinas@....com>, "Rafael J. Wysocki" <rjw@...ysocki.net>, Mark Rutland <mark.rutland@....com> Cc: Graeme Gregory <graeme.gregory@...aro.org>, Arnd Bergmann <arnd@...db.de>, Grant Likely <grant.likely@...aro.org>, Sudeep Holla <Sudeep.Holla@....com>, Will Deacon <will.deacon@....com>, Jason Cooper <jason@...edaemon.net>, Marc Zyngier <marc.zyngier@....com>, Bjorn Helgaas <bhelgaas@...gle.com>, Daniel Lezcano <daniel.lezcano@...aro.org>, Mark Brown <broonie@...aro.org>, Robert Richter <rric@...nel.org>, Lv Zheng <lv.zheng@...el.com>, Robert Moore <robert.moore@...el.com>, Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>, Liviu Dudau <Liviu.Dudau@....com>, Randy Dunlap <rdunlap@...radead.org>, Charles.Garcia-Tobin@....com, linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, linaro-acpi-private@...aro.org, Al Stone <al.stone@...aro.org>, Hanjun Guo <hanjun.guo@...aro.org> Subject: [PATCH 02/19] ARM64 / ACPI: Introduce early_param for "acpi" From: Al Stone <al.stone@...aro.org> 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 <grant.likely@...aro.org> Signed-off-by: Al Stone <al.stone@...aro.org> Signed-off-by: Graeme Gregory <graeme.gregory@...aro.org> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org> --- 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; + } 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@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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