[CPUFREQ] powernow-k8: determine exact CPU frequency for HW Pstates
[sfrench/cifs-2.6.git] / arch / x86 / kernel / cpu / cpufreq / powernow-k8.c
index feef10c085a1dee0bc7dc76ed9ea0cf047e79bf3..f6b32d11235733a1c2cf7153effc4fa42e68e251 100644 (file)
@@ -649,6 +649,20 @@ static void print_basics(struct powernow_k8_data *data)
                                data->batps);
 }
 
+static u32 freq_from_fid_did(u32 fid, u32 did)
+{
+       u32 mhz = 0;
+
+       if (boot_cpu_data.x86 == 0x10)
+               mhz = (100 * (fid + 0x10)) >> did;
+       else if (boot_cpu_data.x86 == 0x11)
+               mhz = (100 * (fid + 8)) >> did;
+       else
+               BUG();
+
+       return mhz * 1000;
+}
+
 static int fill_powernow_table(struct powernow_k8_data *data,
                struct pst_s *pst, u8 maxvid)
 {
@@ -923,8 +937,13 @@ static int fill_powernow_table_pstate(struct powernow_k8_data *data,
 
                powernow_table[i].index = index;
 
-               powernow_table[i].frequency =
-                       data->acpi_data.states[i].core_frequency * 1000;
+               /* Frequency may be rounded for these */
+               if (boot_cpu_data.x86 == 0x10 || boot_cpu_data.x86 == 0x11) {
+                       powernow_table[i].frequency =
+                               freq_from_fid_did(lo & 0x3f, (lo >> 6) & 7);
+               } else
+                       powernow_table[i].frequency =
+                               data->acpi_data.states[i].core_frequency * 1000;
        }
        return 0;
 }