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[CPUFREQ] Longhaul: Magic timer frobbing.

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As mandated by the spec, disable timer around transitions.

From code by : Ken Staton <ken_staton@agilent.com
Signed-off-by: Dave Jones <davej@redhat.com>
This commit is contained in:
Dave Jones 2005-05-31 19:03:51 -07:00
parent 3be6a48f3c
commit 1174631418
1 changed files with 9 additions and 2 deletions
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11
arch/i386/kernel/cpu/cpufreq/longhaul.c
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@ -120,9 +120,10 @@ static int longhaul_get_cpu_mult(void)
static void do_powersaver(union msr_longhaul *longhaul,
unsigned int clock_ratio_index)
{
int version;
unsigned long flags;
struct pci_dev *dev;
unsigned long flags;
unsigned int tmp_mask;
int version;
int i;
u16 pci_cmd;
u16 cmd_state[64];
@ -163,6 +164,10 @@ static void do_powersaver(union msr_longhaul *longhaul,
}
} while (dev != NULL);
tmp_mask=inb(0x21); /* works on C3. save mask. */
outb(0xFE,0x21); /* TMR0 only */
outb(0xFF,0x80); /* delay */
local_irq_enable();
__hlt();
@ -171,6 +176,8 @@ static void do_powersaver(union msr_longhaul *longhaul,
local_irq_disable();
outb(tmp_mask,0x21); /* restore mask */
/* restore pci bus master state for all devices */
dev = NULL;
i = 0;