Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq
[sfrench/cifs-2.6.git] / arch / i386 / kernel / cpu / cpufreq / powernow-k8.c
index beb101157bd915005e0c1f9c6db4f497a62012fd..68a1fc87f4cabb6cb63b71a9c84bc0132494365a 100644 (file)
@@ -32,6 +32,7 @@
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/cpumask.h>
+#include <linux/sched.h>       /* for current / set_cpus_allowed() */
 
 #include <asm/msr.h>
 #include <asm/io.h>
@@ -44,7 +45,7 @@
 
 #define PFX "powernow-k8: "
 #define BFX PFX "BIOS error: "
-#define VERSION "version 1.50.3"
+#define VERSION "version 1.50.4"
 #include "powernow-k8.h"
 
 /* serialize freq changes  */
@@ -111,8 +112,8 @@ static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
        u32 i = 0;
 
        do {
-               if (i++ > 0x1000000) {
-                       printk(KERN_ERR PFX "detected change pending stuck\n");
+               if (i++ > 10000) {
+                       dprintk("detected change pending stuck\n");
                        return 1;
                }
                rdmsr(MSR_FIDVID_STATUS, lo, hi);
@@ -159,6 +160,7 @@ static int write_new_fid(struct powernow_k8_data *data, u32 fid)
 {
        u32 lo;
        u32 savevid = data->currvid;
+       u32 i = 0;
 
        if ((fid & INVALID_FID_MASK) || (data->currvid & INVALID_VID_MASK)) {
                printk(KERN_ERR PFX "internal error - overflow on fid write\n");
@@ -170,10 +172,13 @@ static int write_new_fid(struct powernow_k8_data *data, u32 fid)
        dprintk("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
                fid, lo, data->plllock * PLL_LOCK_CONVERSION);
 
-       wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
-
-       if (query_current_values_with_pending_wait(data))
-               return 1;
+       do {
+               wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
+               if (i++ > 100) {
+                       printk(KERN_ERR PFX "internal error - pending bit very stuck - no further pstate changes possible\n");
+                       return 1;
+               }                       
+       } while (query_current_values_with_pending_wait(data));
 
        count_off_irt(data);
 
@@ -197,6 +202,7 @@ static int write_new_vid(struct powernow_k8_data *data, u32 vid)
 {
        u32 lo;
        u32 savefid = data->currfid;
+       int i = 0;
 
        if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) {
                printk(KERN_ERR PFX "internal error - overflow on vid write\n");
@@ -208,10 +214,13 @@ static int write_new_vid(struct powernow_k8_data *data, u32 vid)
        dprintk("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
                vid, lo, STOP_GRANT_5NS);
 
-       wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
-
-       if (query_current_values_with_pending_wait(data))
-               return 1;
+       do {
+               wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
+                if (i++ > 100) {
+                        printk(KERN_ERR PFX "internal error - pending bit very stuck - no further pstate changes possible\n");
+                        return 1;
+                }
+       } while (query_current_values_with_pending_wait(data));
 
        if (savefid != data->currfid) {
                printk(KERN_ERR PFX "fid changed on vid trans, old 0x%x new 0x%x\n",