On 15:29 Fri 07 May, Carsten Emde wrote:
> + err = rdmsr_safe_on_cpu(id, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
> + if (err)
> + dev_warn(dev, "Unable to read TjMax from CPU.\n");
> + else {
> + val = (eax >> 16) & 0xff;
> + if (val > 80 && val < 120) {
> + dev_info(dev, "TjMax is %dC.\n", val);
> + return val * 1000;
> + } else {
> + dev_warn(dev, "TjMax of %dC not plausible,"
> + " using 100C instead." , val);
> + return 100000;
> + }
> + }
The CPU, in the following case switch, may return no err at the above rdmsr. The
val is 0 with CPU model 0x0f in my test. The function should not return when
(val > 80 && val < 120) is false.
> +
> + /*
> + * An assumption is made for early CPUs and unreadable MSR.
> + * NOTE: the given value may not be correct.
> + */
> + switch (c->x86_model) {
> + case 0x0e:
> + case 0x0f:
> + case 0x16:
> + case 0x1a:
> + dev_warn(dev, "TjMax is assumed as 100C!\n");
> + return 100000;
> + break;
> + case 0x17:
> + case 0x1c: /* Atom CPUs */
> + return adjust_tjmax(c, id, dev);
> + break;
> + default:
> + dev_warn(dev, "CPU (model=0x%x) is not supported yet,"
> + " using default TjMax of 100C.\n", c->x86_model);
> + return 100000;
> + }
> +}
--
Thanks
Huaxu
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