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[CPUFREQ] Longhaul - Option to disable ACPI C3 support 

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>
hifive-unleashed-5.1
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");