1 files changed, 28 insertions, 8 deletions

diff --git a/arch/i386/kernel/cpu/cpufreq/powernow-k7.c b/arch/i386/kernel/cpu/cpufreq/powernow-k7.c
index 837b04166a47..ca3e1d341889 100644
--- a/arch/i386/kernel/cpu/cpufreq/powernow-k7.c
+++ b/arch/i386/kernel/cpu/cpufreq/powernow-k7.c
@@ -341,15 +341,17 @@ static int powernow_acpi_init(void)
         pc.val = (unsigned long) acpi_processor_perf->states[0].control;
         for (i = 0; i < number_scales; i++) {
                 u8 fid, vid;
-                unsigned int speed;
+                struct acpi_processor_px *state =
+                        &acpi_processor_perf->states[i];
+                unsigned int speed, speed_mhz;
 
-                pc.val = (unsigned long) acpi_processor_perf->states[i].control;
+                pc.val = (unsigned long) state->control;
                 dprintk ("acpi:  P%d: %d MHz %d mW %d uS control %08x SGTC %d\n",
                          i,
-                         (u32) acpi_processor_perf->states[i].core_frequency,
-                         (u32) acpi_processor_perf->states[i].power,
-                         (u32) acpi_processor_perf->states[i].transition_latency,
-                         (u32) acpi_processor_perf->states[i].control,
+                         (u32) state->core_frequency,
+                         (u32) state->power,
+                         (u32) state->transition_latency,
+                         (u32) state->control,
                          pc.bits.sgtc);
 
                 vid = pc.bits.vid;
@@ -360,6 +362,18 @@ static int powernow_acpi_init(void)
                 powernow_table[i].index |= (vid << 8); /* upper 8 bits */
 
                 speed = powernow_table[i].frequency;
+                speed_mhz = speed / 1000;
+
+                /* processor_perflib will multiply the MHz value by 1000 to
+                 * get a KHz value (e.g. 1266000). However, powernow-k7 works
+                 * with true KHz values (e.g. 1266768). To ensure that all
+                 * powernow frequencies are available, we must ensure that
+                 * ACPI doesn't restrict them, so we round up the MHz value
+                 * to ensure that perflib's computed KHz value is greater than
+                 * or equal to powernow's KHz value.
+                 */
+                if (speed % 1000 > 0)
+                        speed_mhz++;
 
                 if ((fid_codes[fid] % 10)==5) {
                         if (have_a0 == 1)
@@ -368,10 +382,16 @@ static int powernow_acpi_init(void)
 
                 dprintk ("   FID: 0x%x (%d.%dx [%dMHz])  "
                          "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10,
-                         fid_codes[fid] % 10, speed/1000, vid,
+                         fid_codes[fid] % 10, speed_mhz, vid,
                          mobile_vid_table[vid]/1000,
                          mobile_vid_table[vid]%1000);
 
+                if (state->core_frequency != speed_mhz) {
+                        state->core_frequency = speed_mhz;
+                        dprintk("   Corrected ACPI frequency to %d\n",
+                                speed_mhz);
+                }
+
                 if (latency < pc.bits.sgtc)
                         latency = pc.bits.sgtc;
 
@@ -602,7 +622,7 @@ static int __init powernow_cpu_init (struct cpufreq_policy *policy)
                         result = powernow_acpi_init();
                         if (result) {
                                 printk (KERN_INFO PFX "ACPI and legacy methods failed\n");
-                                printk (KERN_INFO PFX "See http://www.codemonkey.org.uk/projects/cpufreq/powernow-k7.shtml\n");
+                                printk (KERN_INFO PFX "See http://www.codemonkey.org.uk/projects/cpufreq/powernow-k7.html\n");
                         }
                 } else {
                         /* SGTC use the bus clock as timer */