hwmon-vid: Add support for VIA family 6 model D CPU
The VIA family 6 model D CPU (C7-D, Eden 90 nm) can use two different
VID tables, we have to check the value of a MSR to decide which one to
use.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
Tested-by: Jeff Rickman <jrickman@myamigos.us>
diff --git a/drivers/hwmon/hwmon-vid.c b/drivers/hwmon/hwmon-vid.c
index c8195a0..932da8a 100644
--- a/drivers/hwmon/hwmon-vid.c
+++ b/drivers/hwmon/hwmon-vid.c
@@ -140,7 +140,11 @@
return(val & 0x10 ? 975 - (val & 0xF) * 25 :
1750 - val * 50);
case 13:
+ case 131:
val &= 0x3f;
+ /* Exception for Eden ULV 500 MHz */
+ if (vrm == 131 && val == 0x3f)
+ val++;
return(1708 - val * 16);
case 14: /* Intel Core */
/* compute in uV, round to mV */
@@ -205,11 +209,45 @@
{X86_VENDOR_CENTAUR, 0x6, 0x9, 0x7, 85}, /* Nehemiah */
{X86_VENDOR_CENTAUR, 0x6, 0x9, ANY, 17}, /* C3-M, Eden-N */
{X86_VENDOR_CENTAUR, 0x6, 0xA, 0x7, 0}, /* No information */
- {X86_VENDOR_CENTAUR, 0x6, 0xA, ANY, 13}, /* C7, Esther */
+ {X86_VENDOR_CENTAUR, 0x6, 0xA, ANY, 13}, /* C7-M, C7, Eden (Esther) */
+ {X86_VENDOR_CENTAUR, 0x6, 0xD, ANY, 134}, /* C7-D, C7-M, C7, Eden (Esther) */
{X86_VENDOR_UNKNOWN, ANY, ANY, ANY, 0} /* stop here */
};
+/*
+ * Special case for VIA model D: there are two different possible
+ * VID tables, so we have to figure out first, which one must be
+ * used. This resolves temporary drm value 134 to 14 (Intel Core
+ * 7-bit VID), 13 (Pentium M 6-bit VID) or 131 (Pentium M 6-bit VID
+ * + quirk for Eden ULV 500 MHz).
+ * Note: something similar might be needed for model A, I'm not sure.
+ */
+static u8 get_via_model_d_vrm(void)
+{
+ unsigned int vid, brand, dummy;
+ static const char *brands[4] = {
+ "C7-M", "C7", "Eden", "C7-D"
+ };
+
+ rdmsr(0x198, dummy, vid);
+ vid &= 0xff;
+
+ rdmsr(0x1154, brand, dummy);
+ brand = ((brand >> 4) ^ (brand >> 2)) & 0x03;
+
+ if (vid > 0x3f) {
+ pr_info("Using %d-bit VID table for VIA %s CPU\n",
+ 7, brands[brand]);
+ return 14;
+ } else {
+ pr_info("Using %d-bit VID table for VIA %s CPU\n",
+ 6, brands[brand]);
+ /* Enable quirk for Eden */
+ return brand == 2 ? 131 : 13;
+ }
+}
+
static u8 find_vrm(u8 eff_family, u8 eff_model, u8 eff_stepping, u8 vendor)
{
int i = 0;
@@ -247,6 +285,8 @@
eff_model += ((eax & 0x000F0000)>>16)<<4;
}
vrm_ret = find_vrm(eff_family, eff_model, eff_stepping, c->x86_vendor);
+ if (vrm_ret == 134)
+ vrm_ret = get_via_model_d_vrm();
if (vrm_ret == 0)
pr_info("Unknown VRM version of your x86 CPU\n");
return vrm_ret;
