From mboxrd@z Thu Jan  1 00:00:00 1970
From: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Date: Wed, 01 Nov 2006 18:35:01 +0000
Subject: [PATCH] Add support for type argument in PAL_GET_PSTATE
Message-Id: <20061101103500.A16140@unix-os.sc.intel.com>
List-Id: <linux-ia64.vger.kernel.org>
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To: linux-ia64@vger.kernel.org



PAL_GET_PSTATE accepts a type argument to return different kinds of
frequency information.
Refer: Intel Itanium=AEArchitecture Software Developer's Manual -
Volume 2: System Architecture, Revision 2.2
(http://developer.intel.com/design/itanium/manuals/245318.htm)

Add the support for type argument and use Instantaneous frequency
in the acpi driver.

Also fix a bug, where in return value of PAL_GET_PSTATE was getting compared
with 'control' bits instead of 'status' bits.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>

diff -purN linux-2.6.18/arch/ia64/kernel/cpufreq/acpi-cpufreq.c linux-2.6.1=
8-new/arch/ia64/kernel/cpufreq/acpi-cpufreq.c
--- linux-2.6.18/arch/ia64/kernel/cpufreq/acpi-cpufreq.c	2006-09-19 20:42:0=
6.000000000 -0700
+++ linux-2.6.18-new/arch/ia64/kernel/cpufreq/acpi-cpufreq.c	2006-10-10 09:=
58:32.000000000 -0700
@@ -68,7 +68,8 @@ processor_get_pstate (
=20
 	dprintk("processor_get_pstate\n");
=20
-	retval =3D ia64_pal_get_pstate(&pstate_index);
+	retval =3D ia64_pal_get_pstate(&pstate_index,
+	                             PAL_GET_PSTATE_TYPE_INSTANT);
 	*value =3D (u32) pstate_index;
=20
 	if (retval)
@@ -91,7 +92,7 @@ extract_clock (
 	dprintk("extract_clock\n");
=20
 	for (i =3D 0; i < data->acpi_data.state_count; i++) {
-		if (value >=3D data->acpi_data.states[i].control)
+		if (value =3D data->acpi_data.states[i].status)
 			return data->acpi_data.states[i].core_frequency;
 	}
 	return data->acpi_data.states[i-1].core_frequency;
@@ -117,11 +118,7 @@ processor_get_freq (
 		goto migrate_end;
 	}
=20
-	/*
-	 * processor_get_pstate gets the average frequency since the
-	 * last get. So, do two PAL_get_freq()...
-	 */
-	ret =3D processor_get_pstate(&value);
+	/* processor_get_pstate gets the instantaneous frequency */
 	ret =3D processor_get_pstate(&value);
=20
 	if (ret) {
diff -purN linux-2.6.18/include/asm-ia64/pal.h linux-2.6.18-new/include/asm=
-ia64/pal.h
--- linux-2.6.18/include/asm-ia64/pal.h	2006-09-19 20:42:06.000000000 -0700
+++ linux-2.6.18-new/include/asm-ia64/pal.h	2006-10-10 09:59:47.000000000 -=
0700
@@ -79,6 +79,11 @@
 #define PAL_GET_PSTATE		262	/* get the current P-state */
 #define PAL_SET_PSTATE		263	/* set the P-state */
=20
+#define PAL_GET_PSTATE_TYPE_LASTSET	(0)
+#define PAL_GET_PSTATE_TYPE_AVGANDRESET	(1)
+#define PAL_GET_PSTATE_TYPE_AVGNORESET	(2)
+#define PAL_GET_PSTATE_TYPE_INSTANT	(3)
+
 #ifndef __ASSEMBLY__
=20
 #include <linux/types.h>
@@ -1116,10 +1121,10 @@ ia64_pal_halt_info (pal_power_mgmt_info_
=20
 /* Get the current P-state information */
 static inline s64
-ia64_pal_get_pstate (u64 *pstate_index)
+ia64_pal_get_pstate (u64 *pstate_index, unsigned long type)
 {
 	struct ia64_pal_retval iprv;
-	PAL_CALL_STK(iprv, PAL_GET_PSTATE, 0, 0, 0);
+	PAL_CALL_STK(iprv, PAL_GET_PSTATE, type, 0, 0);
 	*pstate_index =3D iprv.v0;
 	return iprv.status;
 }