cpufreq: allow user to specify voltage

From: Pavel Machek (pavel@ucw.cz)
Date: Mon Feb 24 2003 - 17:55:45 EST

Hi!

This allows user to specify voltage manually. This gives me 40 extra
minutes (1h50m -> 2h30m) on HP omnibook which appears to have broken
bios tables. Please apply,

                                                                Pavel
--- clean/arch/i386/kernel/cpu/cpufreq/powernow-k7.c 2003-02-15 18:51:11.000000000 +0100
+++ linux/arch/i386/kernel/cpu/cpufreq/powernow-k7.c 2003-02-18 17:36:29.000000000 +0100
@@ -210,7 +210,7 @@
 }
 
 
-static void change_speed (unsigned int index)
+static void change_speed (unsigned int index, unsigned int voltage)
 {
         u8 fid, vid;
         struct cpufreq_freqs freqs;
@@ -226,6 +226,14 @@
         fid = powernow_table[index].index & 0xFF;
         vid = (powernow_table[index].index & 0xFF00) >> 8;
 
+ if (voltage) {
+ int i;
+ for (i=0; i<32; i++)
+ if (mobile_vid_table[i] == voltage)
+ vid = i;
+ printk("Voltage overriden to %d mV, index 0x%x\n", voltage, vid);
+ }
+
         freqs.cpu = 0;
 
         rdmsrl (MSR_K7_FID_VID_STATUS, fidvidstatus.val);
@@ -338,7 +346,7 @@
         if (cpufreq_frequency_table_target(policy, powernow_table, target_freq, relation, &newstate))
                 return -EINVAL;
 
- change_speed(newstate);
+ change_speed(newstate, policy->voltage);
 
         return 0;
 }
--- clean/drivers/cpufreq/proc_intf.c 2003-02-18 12:24:32.000000000 +0100
+++ linux/drivers/cpufreq/proc_intf.c 2003-02-18 14:23:48.000000000 +0100
@@ -28,6 +28,7 @@
         unsigned int min = 0;
         unsigned int max = 0;
         unsigned int cpu = 0;
+ unsigned int voltage = 0;
         char str_governor[16];
         struct cpufreq_policy current_policy;
         unsigned int result = -EFAULT;
@@ -37,9 +38,24 @@
 
         policy->min = 0;
         policy->max = 0;
+ policy->voltage = 0;
         policy->policy = 0;
         policy->cpu = CPUFREQ_ALL_CPUS;
 
+ if (sscanf(input_string, "%d:%d:%d:%15s", &cpu, &min, &voltage, str_governor) == 4)
+ {
+ if (!strcmp(str_governor, "mVforce")) {
+ printk("Have request to go to %d mV\n", voltage);
+ policy->min = min;
+ policy->max = min;
+ policy->voltage = voltage;
+ policy->cpu = cpu;
+ result = 0;
+ policy->policy = CPUFREQ_POLICY_PERFORMANCE;
+ return 0;
+ }
+ }
+
         if (sscanf(input_string, "%d:%d:%d:%15s", &cpu, &min, &max, str_governor) == 4)
         {
                 policy->min = min;
--- clean/include/linux/cpufreq.h 2003-02-18 12:24:38.000000000 +0100
+++ linux/include/linux/cpufreq.h 2003-02-18 12:25:10.000000000 +0100
@@ -63,6 +63,7 @@
         unsigned int min; /* in kHz */
         unsigned int max; /* in kHz */
         unsigned int policy; /* see above */
+ unsigned int voltage;/* in mV, 0 == trust bios */
         struct cpufreq_governor *governor; /* see below */
         struct cpufreq_cpuinfo cpuinfo; /* see above */
         struct intf_data intf; /* interface data */
--- clean/kernel/cpufreq.c 2003-02-18 12:24:39.000000000 +0100
+++ linux/kernel/cpufreq.c 2003-02-18 17:24:04.000000000 +0100
@@ -1103,11 +1103,12 @@
 
         cpufreq_driver->policy[policy->cpu].min = policy->min;
         cpufreq_driver->policy[policy->cpu].max = policy->max;
+ cpufreq_driver->policy[policy->cpu].voltage= policy->voltage;
 
 #ifdef CONFIG_CPU_FREQ_24_API
         cpu_cur_freq[policy->cpu] = policy->max;
 #endif
 
         if (cpufreq_driver->setpolicy) {
                 cpufreq_driver->policy[policy->cpu].policy = policy->policy;
                 ret = cpufreq_driver->setpolicy(policy); 

-- 
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]
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This archive was generated by hypermail 2b29 : Fri Feb 28 2003 - 22:00:23 EST