hwmon: (hwmon-vid) Add 6-bit vid codes for AMD NPT 0Fh cpus
AMD NPT 0Fh cpus use 6 bit VID codes. Successive codes with msb 0
describe 25mV decrements, while those with msb 1 describe 12.5mV
decrements. Existing hwmon-vid.c is correct only for codes with msb 0;
add support for the codes with msb 1.
Ref:
p 309, Table 71
AMD Publication 32559, BIOS and Kernel Developer's Guide for AMD NPT Family 0Fh Processors
http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/32559.pdf
Signed-off-by: Frank Myhr <fmyhr@fhmtech.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
diff --git a/drivers/hwmon/hwmon-vid.c b/drivers/hwmon/hwmon-vid.c
index ed78a72..7b0a32c 100644
--- a/drivers/hwmon/hwmon-vid.c
+++ b/drivers/hwmon/hwmon-vid.c
@@ -37,18 +37,14 @@
* For VRD 10.0 and up, "VRD x.y Design Guide",
* available at http://developer.intel.com/.
*
+ * AMD NPT 0Fh (Athlon64 & Opteron), AMD Publication 32559,
+ * http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/32559.pdf
+ * Table 71. VID Code Voltages
* AMD Opteron processors don't follow the Intel specifications.
* I'm going to "make up" 2.4 as the spec number for the Opterons.
* No good reason just a mnemonic for the 24x Opteron processor
* series.
*
- * Opteron VID encoding is:
- * 00000 = 1.550 V
- * 00001 = 1.525 V
- * . . . .
- * 11110 = 0.800 V
- * 11111 = 0.000 V (off)
- *
* The 17 specification is in fact Intel Mobile Voltage Positioning -
* (IMVP-II). You can find more information in the datasheet of Max1718
* http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2452
@@ -98,9 +94,11 @@
if (val < 0x02 || val > 0xb2)
return 0;
return((1600000 - (val - 2) * 6250 + 500) / 1000);
- case 24: /* Opteron processor */
- val &= 0x1f;
- return(val == 0x1f ? 0 : 1550 - val * 25);
+
+ case 24: /* AMD NPT 0Fh (Athlon64 & Opteron) */
+ val &= 0x3f;
+ return (val < 32) ? 1550 - 25 * val
+ : 775 - (25 * (val - 31)) / 2;
case 91: /* VRM 9.1 */
case 90: /* VRM 9.0 */
