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>
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@ -140,7 +140,11 @@ int vid_from_reg(int val, u8 vrm)
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return(val & 0x10 ? 975 - (val & 0xF) * 25 :
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1750 - val * 50);
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case 13:
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case 131:
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val &= 0x3f;
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/* Exception for Eden ULV 500 MHz */
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if (vrm == 131 && val == 0x3f)
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val++;
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return(1708 - val * 16);
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case 14: /* Intel Core */
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/* compute in uV, round to mV */
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@ -205,11 +209,45 @@ static struct vrm_model vrm_models[] = {
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{X86_VENDOR_CENTAUR, 0x6, 0x9, 0x7, 85}, /* Nehemiah */
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{X86_VENDOR_CENTAUR, 0x6, 0x9, ANY, 17}, /* C3-M, Eden-N */
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{X86_VENDOR_CENTAUR, 0x6, 0xA, 0x7, 0}, /* No information */
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{X86_VENDOR_CENTAUR, 0x6, 0xA, ANY, 13}, /* C7, Esther */
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{X86_VENDOR_CENTAUR, 0x6, 0xA, ANY, 13}, /* C7-M, C7, Eden (Esther) */
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{X86_VENDOR_CENTAUR, 0x6, 0xD, ANY, 134}, /* C7-D, C7-M, C7, Eden (Esther) */
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{X86_VENDOR_UNKNOWN, ANY, ANY, ANY, 0} /* stop here */
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};
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/*
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* Special case for VIA model D: there are two different possible
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* VID tables, so we have to figure out first, which one must be
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* used. This resolves temporary drm value 134 to 14 (Intel Core
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* 7-bit VID), 13 (Pentium M 6-bit VID) or 131 (Pentium M 6-bit VID
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* + quirk for Eden ULV 500 MHz).
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* Note: something similar might be needed for model A, I'm not sure.
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*/
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static u8 get_via_model_d_vrm(void)
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{
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unsigned int vid, brand, dummy;
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static const char *brands[4] = {
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"C7-M", "C7", "Eden", "C7-D"
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};
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rdmsr(0x198, dummy, vid);
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vid &= 0xff;
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rdmsr(0x1154, brand, dummy);
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brand = ((brand >> 4) ^ (brand >> 2)) & 0x03;
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if (vid > 0x3f) {
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pr_info("Using %d-bit VID table for VIA %s CPU\n",
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7, brands[brand]);
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return 14;
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} else {
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pr_info("Using %d-bit VID table for VIA %s CPU\n",
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6, brands[brand]);
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/* Enable quirk for Eden */
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return brand == 2 ? 131 : 13;
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}
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}
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static u8 find_vrm(u8 eff_family, u8 eff_model, u8 eff_stepping, u8 vendor)
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{
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int i = 0;
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@ -247,6 +285,8 @@ u8 vid_which_vrm(void)
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eff_model += ((eax & 0x000F0000)>>16)<<4;
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}
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vrm_ret = find_vrm(eff_family, eff_model, eff_stepping, c->x86_vendor);
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if (vrm_ret == 134)
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vrm_ret = get_via_model_d_vrm();
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if (vrm_ret == 0)
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pr_info("Unknown VRM version of your x86 CPU\n");
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return vrm_ret;
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