diff options
Diffstat (limited to 'drivers/hwmon/coretemp.c')
| -rw-r--r-- | drivers/hwmon/coretemp.c | 57 |
1 files changed, 44 insertions, 13 deletions
diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c index 972cf4ba963c..caef39cda8c8 100644 --- a/drivers/hwmon/coretemp.c +++ b/drivers/hwmon/coretemp.c @@ -157,17 +157,26 @@ static int __devinit adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device * /* The 100C is default for both mobile and non mobile CPUs */ int tjmax = 100000; - int ismobile = 1; + int tjmax_ee = 85000; + int usemsr_ee = 1; int err; u32 eax, edx; /* Early chips have no MSR for TjMax */ if ((c->x86_model == 0xf) && (c->x86_mask < 4)) { - ismobile = 0; + usemsr_ee = 0; } - if ((c->x86_model > 0xe) && (ismobile)) { + /* Atoms seems to have TjMax at 90C */ + + if (c->x86_model == 0x1c) { + usemsr_ee = 0; + tjmax = 90000; + } + + if ((c->x86_model > 0xe) && (usemsr_ee)) { + u8 platform_id; /* Now we can detect the mobile CPU using Intel provided table http://softwarecommunity.intel.com/Wiki/Mobility/720.htm @@ -179,13 +188,29 @@ static int __devinit adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device * dev_warn(dev, "Unable to access MSR 0x17, assuming desktop" " CPU\n"); - ismobile = 0; - } else if (!(eax & 0x10000000)) { - ismobile = 0; + usemsr_ee = 0; + } else if (c->x86_model < 0x17 && !(eax & 0x10000000)) { + /* Trust bit 28 up to Penryn, I could not find any + documentation on that; if you happen to know + someone at Intel please ask */ + usemsr_ee = 0; + } else { + /* Platform ID bits 52:50 (EDX starts at bit 32) */ + platform_id = (edx >> 18) & 0x7; + + /* Mobile Penryn CPU seems to be platform ID 7 or 5 + (guesswork) */ + if ((c->x86_model == 0x17) && + ((platform_id == 5) || (platform_id == 7))) { + /* If MSR EE bit is set, set it to 90 degrees C, + otherwise 105 degrees C */ + tjmax_ee = 90000; + tjmax = 105000; + } } } - if (ismobile || c->x86_model == 0x1c) { + if (usemsr_ee) { err = rdmsr_safe_on_cpu(id, 0xee, &eax, &edx); if (err) { @@ -193,9 +218,11 @@ static int __devinit adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device * "Unable to access MSR 0xEE, for Tjmax, left" " at default"); } else if (eax & 0x40000000) { - tjmax = 85000; + tjmax = tjmax_ee; } - } else { + /* if we dont use msr EE it means we are desktop CPU (with exeception + of Atom) */ + } else if (tjmax == 100000) { dev_warn(dev, "Using relative temperature scale!\n"); } @@ -248,9 +275,9 @@ static int __devinit coretemp_probe(struct platform_device *pdev) platform_set_drvdata(pdev, data); /* read the still undocumented IA32_TEMPERATURE_TARGET it exists - on older CPUs but not in this register */ + on older CPUs but not in this register, Atoms don't have it either */ - if (c->x86_model > 0xe) { + if ((c->x86_model > 0xe) && (c->x86_model != 0x1c)) { err = rdmsr_safe_on_cpu(data->id, 0x1a2, &eax, &edx); if (err) { dev_warn(&pdev->dev, "Unable to read" @@ -413,11 +440,15 @@ static int __init coretemp_init(void) for_each_online_cpu(i) { struct cpuinfo_x86 *c = &cpu_data(i); - /* check if family 6, models 0xe, 0xf, 0x16, 0x17, 0x1A */ + /* check if family 6, models 0xe (Pentium M DC), + 0xf (Core 2 DC 65nm), 0x16 (Core 2 SC 65nm), + 0x17 (Penryn 45nm), 0x1a (Nehalem), 0x1c (Atom), + 0x1e (Lynnfield) */ if ((c->cpuid_level < 0) || (c->x86 != 0x6) || !((c->x86_model == 0xe) || (c->x86_model == 0xf) || (c->x86_model == 0x16) || (c->x86_model == 0x17) || - (c->x86_model == 0x1A) || (c->x86_model == 0x1c))) { + (c->x86_model == 0x1a) || (c->x86_model == 0x1c) || + (c->x86_model == 0x1e))) { /* supported CPU not found, but report the unknown family 6 CPU */ |