Commit 7afd3b34 authored by Samuel Thibault's avatar Samuel Thibault Committed by Linus Torvalds

[PATCH] cpufreq: correct initialization on Intel Coppermines

Intel seems to have changed their mind, and now document the detection
process for speedstep-enabled Pentium III Coppermines:

	http://www.intel.com/support/processors/sb/cs-003779-prd24.htm

Here is a patch.

I kept the setup parameter, but it might be removed now?
parent d249e539
...@@ -503,6 +503,17 @@ static unsigned int speedstep_detect_processor (void) ...@@ -503,6 +503,17 @@ static unsigned int speedstep_detect_processor (void)
if (speedstep_coppermine) if (speedstep_coppermine)
return SPEEDSTEP_PROCESSOR_PIII_C; return SPEEDSTEP_PROCESSOR_PIII_C;
/*
* If the processor is a mobile version,
* platform ID has bit 50 set
* it has SpeedStep technology if either
* bit 56 or 57 is set
*/
rdmsr(MSR_IA32_PLATFORM_ID, msr_lo, msr_hi);
dprintk(KERN_DEBUG "cpufreq: Coppermine: MSR_IA32_PLATFORM ID is 0x%x, 0x%x\n", msr_lo, msr_hi);
if ((msr_hi & (1<<18)) && (msr_hi & (3<<24)))
return SPEEDSTEP_PROCESSOR_PIII_C;
printk(KERN_INFO "cpufreq: in case this is a SpeedStep-capable Intel Pentium III Coppermine\n"); printk(KERN_INFO "cpufreq: in case this is a SpeedStep-capable Intel Pentium III Coppermine\n");
printk(KERN_INFO "cpufreq: processor, please pass the boot option or module parameter\n"); printk(KERN_INFO "cpufreq: processor, please pass the boot option or module parameter\n");
printk(KERN_INFO "cpufreq: `speedstep_coppermine=1` to the kernel. Thanks!\n"); printk(KERN_INFO "cpufreq: `speedstep_coppermine=1` to the kernel. Thanks!\n");
......
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