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[CPUFREQ] Longhaul - Option to disable ACPI C3 support

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On some motherboards ACPI C3 is available, but it isn't
causing frequency transition on VIA Nehemiah. Longhaul
wasn't working at all earlier, but due to
scaling_cur_speed returning true CPU frequency now, it
looks like CPU is getting stuck at highest frequency
since 2.6.21. I didn't find a reason. Halt is causing
frequency transition.

Signed-off-by: Rafal Bilski <rafalbilski@interia.pl>
Signed-off-by: Dave Jones <davej@redhat.com>
This commit is contained in:
Rafał Bilski 2007-07-08 21:51:26 +02:00 committed by Dave Jones
parent 773208946a
commit 905497c4b2
1 changed files with 7 additions and 0 deletions
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7
arch/i386/kernel/cpu/cpufreq/longhaul.c
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@ -75,6 +75,7 @@ static unsigned int longhaul_index;
/* Module parameters */
static int scale_voltage;
static int disable_acpi_c3;
#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "longhaul", msg)
@ -844,6 +845,9 @@ static int __init longhaul_cpu_init(struct cpufreq_policy *policy)
if (cx->address > 0 && cx->latency <= 1000)
longhaul_flags |= USE_ACPI_C3;
}
/* Disable if it isn't working */
if (disable_acpi_c3)
longhaul_flags &= ~USE_ACPI_C3;
/* Check if northbridge is friendly */
if (enable_arbiter_disable())
longhaul_flags |= USE_NORTHBRIDGE;
@ -952,6 +956,9 @@ static void __exit longhaul_exit(void)
kfree(longhaul_table);
}
module_param (disable_acpi_c3, int, 0644);
MODULE_PARM_DESC(disable_acpi_c3, "Don't use ACPI C3 support");
module_param (scale_voltage, int, 0644);
MODULE_PARM_DESC(scale_voltage, "Scale voltage of processor");