[PATCH v4 06/13] ARM64 / ACPI: Introduce early_param for "acpi"
From: Hanjun Guo <hidden>
Date: 2014-06-27 03:51:35
Also in:
linux-acpi, lkml
Subsystem:
acpi, documentation, the rest · Maintainers:
"Rafael J. Wysocki", Jonathan Corbet, Linus Torvalds
From: Al Stone <redacted> 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 <redacted> Signed-off-by: Al Stone <redacted> Signed-off-by: Graeme Gregory <redacted> Signed-off-by: Hanjun Guo <redacted> --- 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