Small cleanups / docs improvements for powernow-k8

@@ -18,6 +18,9 @@
  *  Processor information obtained from Chapter 9 (Power and Thermal Management)
  *  of the "BIOS and Kernel Developer's Guide for the AMD Athlon 64 and AMD
  *  Opteron Processors" available for download from www.amd.com
+ *
+ *  Tables for specific CPUs can be infrerred from
+ *	http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/30430.pdf
  */
 
 #include <linux/kernel.h>

@@ -65,7 +68,12 @@
 	return 1550-vid*25;
 }
 
-/* Return the vco fid for an input fid */
+/* Return the vco fid for an input fid
+ *
+ * Each "low" fid has corresponding "high" fid, and you can get to "low" fids
+ * only from corresponding high fids. This returns "high" fid corresponding to
+ * "low" one.
+ */
 static u32 convert_fid_to_vco_fid(u32 fid)
 {
 	if (fid < HI_FID_TABLE_BOTTOM) {

@@ -309,10 +317,7 @@
 /* Phase 2 - core frequency transition */
 static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
 {
-	u32 vcoreqfid;
-	u32 vcocurrfid;
-	u32 vcofiddiff;
-	u32 savevid = data->currvid;
+	u32 vcoreqfid, vcocurrfid, vcofiddiff, savevid = data->currvid;
 
 	if ((reqfid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
 		printk(KERN_ERR PFX "ph2: illegal lo-lo transition 0x%x 0x%x\n",

@@ -501,7 +495,7 @@
 		    || (pst[j].fid & 1)
 		    || (j && (pst[j].fid < HI_FID_TABLE_BOTTOM))) {
 			/* Only first fid is allowed to be in "low" range */
-			printk(KERN_ERR PFX "fid %d invalid : 0x%x\n", j, pst[j].fid);
+			printk(KERN_ERR PFX "two low fids - %d : 0x%x\n", j, pst[j].fid);
 			return -EINVAL;
 		}
 		if (pst[j].fid < lastfid)

@@ -621,7 +615,7 @@
 			return -ENODEV;
 		}
 
-		data->vstable = psb->voltagestabilizationtime;
+		data->vstable = psb->vstable;
 		dprintk(KERN_INFO PFX "voltage stabilization time: %d(*20us)\n", data->vstable);
 
 		dprintk(KERN_DEBUG PFX "flags2: 0x%x\n", psb->flags2);

@@ -654,7 +648,7 @@
 		dprintk(KERN_INFO PFX "maxvid: 0x%x\n", psb->maxvid);
 		maxvid = psb->maxvid;
 
-		data->numps = psb->numpstates;
+		data->numps = psb->numps;
 		dprintk(KERN_INFO PFX "numpstates: 0x%x\n", data->numps);
 		return fill_powernow_table(data, (struct pst_s *)(psb+1), maxvid);
 	}

@@ -21,8 +21,7 @@
 	u32 plllock; /* pll lock time, units 1 us */
 
 	/* keep track of the current fid / vid */
-	u32 currvid;
-	u32 currfid;
+	u32 currvid, currfid;
 
 	/* the powernow_table includes all frequency and vid/fid pairings:
 	 * fid are the lower 8 bits of the index, vid are the upper 8 bits.

@@ -152,14 +151,14 @@
 	u8 signature[10];
 	u8 tableversion;
 	u8 flags1;
-	u16 voltagestabilizationtime;
+	u16 vstable;
 	u8 flags2;
-	u8 numpst;
+	u8 num_tables;
 	u32 cpuid;
 	u8 plllocktime;
 	u8 maxfid;
 	u8 maxvid;
-	u8 numpstates;
+	u8 numps;
 };
 
 /* Pairs of fid/vid values are appended to the version 1.4 PSB table. */