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-rw-r--r--arch/i386/kernel/cpu/cpufreq/longhaul.c44
1 files changed, 14 insertions, 30 deletions
diff --git a/arch/i386/kernel/cpu/cpufreq/longhaul.c b/arch/i386/kernel/cpu/cpufreq/longhaul.c
index fd70c77acc1..f152c291e7c 100644
--- a/arch/i386/kernel/cpu/cpufreq/longhaul.c
+++ b/arch/i386/kernel/cpu/cpufreq/longhaul.c
@@ -318,12 +318,12 @@ static void longhaul_setstate(unsigned int clock_ratio_index)
#define ROUNDING 0xf
-static int _guess(int guess)
+static int _guess(int guess, int mult)
{
int target;
- target = ((maxmult/10)*guess);
- if (maxmult%10 != 0)
+ target = ((mult/10)*guess);
+ if (mult%10 != 0)
target += (guess/2);
target += ROUNDING/2;
target &= ~ROUNDING;
@@ -331,17 +331,17 @@ static int _guess(int guess)
}
-static int guess_fsb(void)
+static int guess_fsb(int mult)
{
int speed = (cpu_khz/1000);
int i;
- int speeds[3] = { 66, 100, 133 };
+ int speeds[] = { 66, 100, 133, 200 };
speed += ROUNDING/2;
speed &= ~ROUNDING;
- for (i=0; i<3; i++) {
- if (_guess(speeds[i]) == speed)
+ for (i=0; i<4; i++) {
+ if (_guess(speeds[i], mult) == speed)
return speeds[i];
}
return 0;
@@ -361,6 +361,7 @@ static int __init longhaul_get_ranges(void)
unsigned long lo, hi;
unsigned int eblcr_fsb_table_v1[] = { 66, 133, 100, -1 };
unsigned int eblcr_fsb_table_v2[] = { 133, 100, -1, 66 };
+ int mult;
switch (longhaul_version) {
case TYPE_LONGHAUL_V1:
@@ -368,30 +369,18 @@ static int __init longhaul_get_ranges(void)
/* Ugh, Longhaul v1 didn't have the min/max MSRs.
Assume min=3.0x & max = whatever we booted at. */
minmult = 30;
- maxmult = longhaul_get_cpu_mult();
- rdmsr (MSR_IA32_EBL_CR_POWERON, lo, hi);
- invalue = (lo & (1<<18|1<<19)) >>18;
- if (cpu_model==CPU_SAMUEL || cpu_model==CPU_SAMUEL2)
- fsb = eblcr_fsb_table_v1[invalue];
- else
- fsb = guess_fsb();
+ maxmult = mult = longhaul_get_cpu_mult();
break;
case TYPE_POWERSAVER:
/* Ezra-T */
if (cpu_model==CPU_EZRA_T) {
+ minmult = 30;
rdmsrl (MSR_VIA_LONGHAUL, longhaul.val);
invalue = longhaul.bits.MaxMHzBR;
if (longhaul.bits.MaxMHzBR4)
invalue += 16;
- maxmult=ezra_t_multipliers[invalue];
-
- invalue = longhaul.bits.MinMHzBR;
- if (longhaul.bits.MinMHzBR4 == 1)
- minmult = 30;
- else
- minmult = ezra_t_multipliers[invalue];
- fsb = eblcr_fsb_table_v2[longhaul.bits.MaxMHzFSB];
+ maxmult = mult = ezra_t_multipliers[invalue];
break;
}
@@ -411,21 +400,16 @@ static int __init longhaul_get_ranges(void)
* But it works, so we don't grumble.
*/
minmult=40;
- maxmult=longhaul_get_cpu_mult();
-
- /* Starting with the 1.2GHz parts, theres a 200MHz bus. */
- if ((cpu_khz/maxmult) > 13400)
- fsb = 200;
- else
- fsb = eblcr_fsb_table_v2[longhaul.bits.MaxMHzFSB];
+ maxmult = mult = longhaul_get_cpu_mult();
break;
}
}
+ fsb = guess_fsb(mult);
dprintk ("MinMult:%d.%dx MaxMult:%d.%dx\n",
minmult/10, minmult%10, maxmult/10, maxmult%10);
- if (fsb == -1) {
+ if (fsb == 0) {
printk (KERN_INFO PFX "Invalid (reserved) FSB!\n");
return -EINVAL;
}