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Commit 11746314 authored by Dave Jones's avatar Dave Jones
Browse files

[CPUFREQ] Longhaul: Magic timer frobbing. 



As mandated by the spec, disable timer around transitions.

From code by : Ken Staton <ken_staton@agilent.com
Signed-off-by: default avatarDave Jones <davej@redhat.com>
parent 3be6a48f

arch/i386/kernel/cpu/cpufreq/longhaul.c

+9 −2
Original line number Diff line number Diff line
@@ -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;