From: Hendrik Muhs <Hendrik.Muhs@web.de>
To: cpufreq@www.linux.org.uk
Subject: [PATCH] Another powernow-k7 patch for Desktop XP-M usage
Date: Tue, 12 Oct 2004 10:18:20 +0200 [thread overview]
Message-ID: <200410121018.20518.Hendrik.Muhs@web.de> (raw)
[-- Attachment #1: Type: text/plain, Size: 1261 bytes --]
Hi,
I have Athlon XP-M CPU running on Desktop board, which means my BIOS has no
PST tables.
After testing the available patches to fix this problem, I combined them an
wrote my own patch.
The attached patch is for the latest stable kernel 2.6.8.1 and adds the
following parameters:
- overwrite_table
activates the manually settings, set it to >=1
- multiplier
specifies an array of multipliers, odd multipliers must be multiplied by 10:
3.5 -> 35
- voltage
specifies an array of VCore voltages in respect to the specified multipliers.
You have to specify them as mV:
1.125 -> 1125
- switch_latency
sets the state transition latency in microseconds (default 200us)
The patch does not allow overclocking: higher multipliers and/or voltages than
the maximum specified on CPU will be ignored.
You do not have to specify voltages, in this case the CPU default will be used
(on some boards voltage switching is not possible anyway).
example usage:
modprobe powernow-k7 overwrite_table=1 multiplier=3,4,5,6,7,8,9,10
Disclaimer:
It should not be possible to burn the CPU, but some combinations could crash
the system. I give no guaranty that it works for your system and/or any
possibly resulting hardware damage.
Have fun with it,
Hendrik
[-- Attachment #2: powernow-k7.patch --]
[-- Type: text/x-diff, Size: 9211 bytes --]
--- arch/i386/kernel/cpu/cpufreq/powernow-k7.c.orig 2004-08-14 07:36:12.000000000 +0200
+++ arch/i386/kernel/cpu/cpufreq/powernow-k7.c 2004-10-03 18:20:56.000000000 +0200
@@ -76,28 +76,50 @@
};
#endif
-/* divide by 1000 to get VID. */
+/* divide by 1000 to get VCore voltage in V. */
static int mobile_vid_table[32] = {
2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650,
1600, 1550, 1500, 1450, 1400, 1350, 1300, 0,
1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100,
- 1075, 1050, 1024, 1000, 975, 950, 925, 0,
+ 1075, 1050, 1025, 1000, 975, 950, 925, 0,
};
-/* divide by 10 to get FID. */
+/* divide by 10 to get multiplier. */
static int fid_codes[32] = {
110, 115, 120, 125, 50, 55, 60, 65,
70, 75, 80, 85, 90, 95, 100, 105,
30, 190, 40, 200, 130, 135, 140, 210,
- 150, 225, 160, 165, 170, 180, -1, -1,
+ 150, 220, 160, 165, 170, 180, -1, -1,
};
+/* translation table for even multiplier to fid */
+static int even_multiplier[20]= {
+ 16, 18, 4, 6, 8, 10, 12, 14, // 3, 4, 5, 6, 7 ,8 , 9, 10
+ 0, 2, 20, 22, 24, 26, 28, 29, // 11, 12, 13, 14, 15, 16, 17, 18
+ 17, 19, 23, 25, // 19, 20, 21, 22
+};
+
+/* translation table for odd multiplier to fid*/
+static int odd_multiplier[9]={
+ 5, 7, 9, 11, 12, 13, 1, 3, // 5.5, 6.5, 7.5, 8.5, 9.5, 10.5, 11.5, 12.5
+ 21, // 13.5
+};
+
+
/* This parameter is used in order to force ACPI instead of legacy method for
* configuration purpose.
*/
static int acpi_force;
+/* This parameters can be used to manually overwrite the tables */
+static int overwrite_table = 0;
+#define MAX_PST 10
+static int maxPSTSize = MAX_PST;
+static int multiplier[MAX_PST]= {[0 ... (MAX_PST - 1)] = 0};
+static int voltage[MAX_PST]= {[0 ... (MAX_PST - 1)] = 0};
+static int switch_latency=0;
+
static struct cpufreq_frequency_table *powernow_table;
static unsigned int can_scale_bus;
@@ -414,6 +436,131 @@
}
#endif
+static int powernow_manual_settings(union msr_fidvidstatus *fidvidstatus)
+{
+ int i,k, validentry;
+ unsigned int max_multiplier, max_voltage;
+ unsigned int speed, cm;
+ u8 vid, fid;
+ static struct cpufreq_frequency_table *powernow_table_tmp;
+
+ if (switch_latency > 0) {
+ if (switch_latency < 100) {
+ printk (KERN_INFO PFX "Settling time passed as %d microseconds."
+ "Should be at least 100. Correcting.\n", switch_latency);
+ switch_latency = 100;
+ }
+ latency = switch_latency;
+ } else {
+ latency = 200;
+ }
+ dprintk (KERN_INFO PFX "Settling Time: %d microseconds.\n", latency);
+
+ /* get number of specified multipliers */
+ for (i=0; i< MAX_PST; i++) {
+ if (multiplier[i] == 0) {
+ number_scales=i;
+ break;
+ }
+ }
+
+ /* get maximum values */
+ max_multiplier = fid_codes[fidvidstatus->bits.MFID];
+ max_voltage = mobile_vid_table[fidvidstatus->bits.MVID];
+
+ /* allocate memory */
+ powernow_table=kmalloc((sizeof(struct cpufreq_frequency_table) * (number_scales + 1)), GFP_KERNEL);
+ if (!powernow_table)
+ return -ENOMEM;
+ memset(powernow_table,0,(sizeof(struct cpufreq_frequency_table)*(number_scales+1)));
+
+ k=0;
+ for(i=0; i<number_scales; i++)
+ {
+ validentry = 0;
+ if (multiplier[i] != 0) {
+ /* fix multiplier */
+ if (multiplier[i] < 30)
+ multiplier[i]=multiplier[i] * 10;
+
+ if (multiplier[i] < max_multiplier) {
+ cm = (multiplier[i]/10);
+ /* check if odd or even muliplier */
+ if (multiplier[i]%10) {
+ /* odd multiplier */
+ if (cm == 16) {
+ /* hardcoded because 14.5 and 15.5 fids not possible */
+ fid = 27;
+ validentry = 1;
+ }else if ((cm > 4) && (cm < 14)) {
+ fid= odd_multiplier[cm-5];
+ validentry = 1;
+ }
+ } else {
+ /* even_multiplier */
+ if ((cm < 23) && (cm > 2)) {
+ fid = even_multiplier[cm-3];
+ validentry=1;
+ }
+ }
+ }
+ }
+
+ if (validentry) {
+ /* if no voltage specified use CPU default */
+ if (voltage[i] == 0)
+ voltage[i] = max_voltage;
+
+ /* we do not allow higher voltages than the CPU's maximum
+ 925 mV is the minimum */
+ if ((voltage[i] <= max_voltage) && (voltage[i] >= 925)) {
+ if (voltage[i] >= 1300) {
+ vid = 40 - (voltage[i]/50);
+ } else {
+ vid = 67 - (voltage[i]/25);
+ }
+ /* calculate speed */
+ speed = fsb * fid_codes[fid] / 10;
+ powernow_table[k].frequency = speed;
+ powernow_table[k].index=fid; /*lower 8 bits*/
+ powernow_table[k].index|= (vid << 8); /*upper 8 bits*/
+
+ if (speed < minimum_speed)
+ minimum_speed = speed;
+ if (speed > maximum_speed)
+ maximum_speed = speed;
+
+ dprintk (KERN_INFO PFX " FID: 0x%x (%d.%dx [%dMHz])\t", fid, fid_codes[fid] / 10, fid_codes[fid] % 10, speed/1000);
+ dprintk ("VID: 0x%x (%d.%03dV)\n", vid, mobile_vid_table[vid]/1000, mobile_vid_table[vid]%1000);
+ k++;
+ }
+ } else {
+ // invalid entry
+ dprintk (KERN_INFO PFX "Entry %d is invalid\n", i+1);
+ }
+ }
+
+ if (k < number_scales) {
+ /* some entrys were invalid need to realloc table */
+ number_scales = k;
+ powernow_table_tmp = kmalloc((sizeof(struct cpufreq_frequency_table) * (number_scales + 1)), GFP_KERNEL);
+ if (!powernow_table_tmp) {
+ kfree(powernow_table);
+ return -ENOMEM;
+ }
+ memcpy(powernow_table_tmp,powernow_table,(sizeof(struct cpufreq_frequency_table) * (number_scales + 1)));
+ kfree(powernow_table);
+ powernow_table=powernow_table_tmp;
+ }
+
+
+ /* Terminate frequency list */
+ powernow_table[number_scales].frequency = CPUFREQ_TABLE_END;
+ powernow_table[number_scales].index = 0;
+
+ return 0;
+}
+
static int powernow_decode_bios (int maxfid, int startvid)
{
struct psb_s *psb;
@@ -601,6 +748,11 @@
if (dmi_check_system(powernow_dmi_table) || acpi_force) {
printk (KERN_INFO PFX "PSB/PST known to be broken. Trying ACPI instead\n");
result = powernow_acpi_init();
+ }
+ else if (overwrite_table){
+ printk(KERN_INFO PFX "Overwriting PST table with manual settings\n");
+ result = powernow_manual_settings(&fidvidstatus);
+
} else {
result = powernow_decode_bios(fidvidstatus.bits.MFID, fidvidstatus.bits.SVID);
if (result) {
@@ -681,6 +833,14 @@
module_param(acpi_force, int, 0444);
MODULE_PARM_DESC(acpi_force, "Force ACPI to be used");
+module_param(overwrite_table,int,0444);
+MODULE_PARM_DESC(overwrite_table, "overwrite table with manually settings");
+module_param_array(multiplier, int, maxPSTSize, 0444);
+MODULE_PARM_DESC(multiplier, "Specifiy up to 10 multipliers, multiply them by 10: 5->50, 5.5->55");
+module_param_array(voltage, int, maxPSTSize, 0444);
+MODULE_PARM_DESC(voltage, "Specify voltages in respect to the given multipliers, specify them in mV: 1.275V -> 1275");
+module_param(switch_latency, int, 0444);
+MODULE_PARM_DESC(switch_latency, "Set state transition latency in microseconds (default 200us)");
MODULE_AUTHOR ("Dave Jones <davej@codemonkey.org.uk>");
MODULE_DESCRIPTION ("Powernow driver for AMD K7 processors.");
@@ -688,4 +848,3 @@
late_initcall(powernow_init);
module_exit(powernow_exit);
-
[-- Attachment #3: Type: text/plain, Size: 143 bytes --]
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next reply other threads:[~2004-10-12 8:18 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-12 8:18 Hendrik Muhs [this message]
2004-10-14 23:26 ` [PATCH] Another powernow-k7 patch for Desktop XP-M usage Nebojsa Trpkovic
2004-10-20 9:43 ` Bruno Ducrot
2004-10-20 22:05 ` Harald Milz
2004-10-21 0:56 ` Nebojsa Trpkovic
-- strict thread matches above, loose matches on Subject: below --
2004-10-15 7:05 Hendrik Muhs
2004-10-15 22:28 ` Nebojsa Trpkovic
2004-11-29 21:36 ` Nebojsa Trpkovic
2004-10-16 16:11 ` mark newman
2005-01-14 11:46 ` Jarkko Lavinen
2005-01-17 15:21 ` Hendrik Muhs
2005-01-17 16:31 ` Jarkko Lavinen
2005-01-19 15:35 ` Jarkko Lavinen
2004-12-01 20:09 Hendrik Muhs
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