Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=905497c4b2e6715eebde97cbcb313354e14c2489
Commit:     905497c4b2e6715eebde97cbcb313354e14c2489
Parent:     773208946a132fb733ba273ee8562814f828cc28
Author:     RafaƂ Bilski <[EMAIL PROTECTED]>
AuthorDate: Sun Jul 8 21:51:26 2007 +0200
Committer:  Dave Jones <[EMAIL PROTECTED]>
CommitDate: Fri Jul 13 01:29:50 2007 -0400

    [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 <[EMAIL PROTECTED]>
    Signed-off-by: Dave Jones <[EMAIL PROTECTED]>
---
 arch/i386/kernel/cpu/cpufreq/longhaul.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/arch/i386/kernel/cpu/cpufreq/longhaul.c 
b/arch/i386/kernel/cpu/cpufreq/longhaul.c
index 8eca59d..ef8f0bc 100644
--- a/arch/i386/kernel/cpu/cpufreq/longhaul.c
+++ b/arch/i386/kernel/cpu/cpufreq/longhaul.c
@@ -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");
 
-
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