From mboxrd@z Thu Jan 1 00:00:00 1970 From: hanjun.guo@linaro.org (Hanjun Guo) Date: Mon, 1 Sep 2014 22:57:42 +0800 Subject: [PATCH v3 04/17] ARM64 / ACPI: Introduce early_param for "acpi" In-Reply-To: <1409583475-6978-1-git-send-email-hanjun.guo@linaro.org> References: <1409583475-6978-1-git-send-email-hanjun.guo@linaro.org> Message-ID: <1409583475-6978-5-git-send-email-hanjun.guo@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Al Stone Introduce one early parameters "off" for "acpi" to disable ACPI on ARM64. 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 | 15 +++++++++++++++ 2 files changed, 17 insertions(+), 1 deletion(-) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 5ae8608..9dfb1d8 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 "acpi=off" is 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 b6940a0..9547275 100644 --- a/arch/arm64/kernel/acpi.c +++ b/arch/arm64/kernel/acpi.c @@ -74,3 +74,18 @@ void __init acpi_boot_table_init(void) * TBD when ARM/ARM64 starts to support suspend... */ int (*acpi_suspend_lowlevel)(void) = NULL; + +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(); + else + return -EINVAL; /* Core will print when we return error */ + + return 0; +} +early_param("acpi", parse_acpi); -- 1.7.9.5