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hwmon: (coretemp) Add support for Penryn mobile CPUs

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Following patch adds support for mobile Penryn CPUs. Intel documents this
poorly. I asked the Coretemp author for some help. This is totally untested and
may not work. Please test!

Signed-off-by: Rudolf Marek <r.marek@assembler.cz>
Cc: Huaxu Wan <huaxu.wan@linux.intel.com>
Cc: Kent Liu <kent.liu@linux.intel.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Rudolf Marek 2009-09-23 22:59:42 +02:00 committed by Jean Delvare
parent 708a62bcd5
commit eccfed4221
2 changed files with 26 additions and 4 deletions
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4
Documentation/hwmon/coretemp
View file

@ -4,7 +4,9 @@ Kernel driver coretemp
Supported chips:
* All Intel Core family
Prefix: 'coretemp'
CPUID: family 0x6, models 0xe, 0xf, 0x16, 0x17, 0x1c (Atom)
CPUID: family 0x6, models 0xe (Pentium M DC), 0xf (Core 2 DC 65nm),
0x16 (Core 2 SC 65nm), 0x17 (Penryn 45nm),
0x1a (Nehalem), 0x1c (Atom).
Datasheet: Intel 64 and IA-32 Architectures Software Developer's Manual
Volume 3A: System Programming Guide
http://softwarecommunity.intel.com/Wiki/Mobility/720.htm

26
drivers/hwmon/coretemp.c
View file

@ -157,6 +157,7 @@ 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 tjmax_ee = 85000;
int usemsr_ee = 1;
int err;
u32 eax, edx;
@ -175,6 +176,7 @@ static int __devinit adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *
}
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
@ -187,8 +189,24 @@ static int __devinit adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *
"Unable to access MSR 0x17, assuming desktop"
" CPU\n");
usemsr_ee = 0;
} else if (!(eax & 0x10000000)) {
} 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;
}
}
}
@ -200,7 +218,7 @@ 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;
}
/* if we dont use msr EE it means we are desktop CPU (with exeception
of Atom) */
@ -422,7 +440,9 @@ 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, 0x1c */
/* 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) */
if ((c->cpuid_level < 0) || (c->x86 != 0x6) ||
!((c->x86_model == 0xe) || (c->x86_model == 0xf) ||
(c->x86_model == 0x16) || (c->x86_model == 0x17) ||