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authorThomas Renninger <trenn@suse.de>2010-11-03 17:06:14 +0100
committerLen Brown <len.brown@intel.com>2011-01-12 12:47:30 -0500
commitd18960494f65ca4fa0d67c865aaca99452070d15 (patch)
tree93c37d0dd4bf8c254b312f75eb97f54077a9baed /drivers/idle
parentd8c216cfa57e8a579f41729cbb88c97835d9ac8d (diff)
downloadblackbird-op-linux-d18960494f65ca4fa0d67c865aaca99452070d15.tar.gz
blackbird-op-linux-d18960494f65ca4fa0d67c865aaca99452070d15.zip
ACPI, intel_idle: Cleanup idle= internal variables
Having four variables for the same thing: idle_halt, idle_nomwait, force_mwait and boot_option_idle_overrides is rather confusing and unnecessary complex. if idle= boot param is passed, only set up one variable: boot_option_idle_overrides Introduces following functional changes/fixes: - intel_idle driver does not register if any idle=xy boot param is passed. - processor_idle.c will also not register a cpuidle driver and get active if idle=halt is passed. Before a cpuidle driver with one (C1, halt) state got registered Now the default_idle function will be used which finally uses the same idle call to enter sleep state (safe_halt()), but without registering a whole cpuidle driver. That means idle= param will always avoid cpuidle drivers to register with one exception (same behavior as before): idle=nomwait may still register acpi_idle cpuidle driver, but C1 will not use mwait, but hlt. This can be a workaround for IO based deeper sleep states where C1 mwait causes problems. Signed-off-by: Thomas Renninger <trenn@suse.de> cc: x86@kernel.org Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/idle')
-rw-r--r--drivers/idle/intel_idle.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index 94a652625ae2..21d387132dbc 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -404,6 +404,10 @@ static int __init intel_idle_init(void)
{
int retval;
+ /* Do not load intel_idle at all for now if idle= is passed */
+ if (boot_option_idle_override != IDLE_NO_OVERRIDE)
+ return -ENODEV;
+
retval = intel_idle_probe();
if (retval)
return retval;
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