linux-moblin: Add 2.6.31.5

Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

1 files changed, 173 insertions, 0 deletions

diff --git a/meta-moblin/packages/linux/linux-moblin-2.6.31.5/linux-2.6.32-acpi-cstate-fixup.patch b/meta-moblin/packages/linux/linux-moblin-2.6.31.5/linux-2.6.32-acpi-cstate-fixup.patch
new file mode 100644
index 000000000..6a1204d4c
--- /dev/null
+++ b/meta-moblin/packages/linux/linux-moblin-2.6.31.5/linux-2.6.32-acpi-cstate-fixup.patch
@@ -0,0 +1,173 @@
+From edeae90d635501a632efa0c7fe0667aa2cbe29be Mon Sep 17 00:00:00 2001
+From: Arjan van de Ven <arjan@linux.intel.com>
+Date: Mon, 28 Sep 2009 15:14:04 +0200
+Subject: [PATCH] acpi: Provide a set of tables to check the BIOS tables for correctness
+
+Today, the BIOS provides us with latency information for each C state.
+Unfortunately this information is sometimes put into the BIOS by
+apprentice BIOS programmers in a hurry, and as a result, it occasionally
+contains utter garbage.
+
+This patch adds a table based verification; if the CPU is known in the table,
+the values the BIOS provides to us are corrected for the apprentice-factor
+so that the CPUIDLE code can rely on the latency and break-even values
+to be reasonably sane.
+
+Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
+---
+ drivers/acpi/Makefile                |    2 +-
+ drivers/acpi/processor_idle.c        |    3 +
+ drivers/acpi/processor_mwait_table.c |  110 ++++++++++++++++++++++++++++++++++
+ include/acpi/processor.h             |    3 +
+ 4 files changed, 117 insertions(+), 1 deletions(-)
+ create mode 100644 drivers/acpi/processor_mwait_table.c
+
+diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
+index 82cd49d..ab56b28 100644
+--- a/drivers/acpi/Makefile
++++ b/drivers/acpi/Makefile
+@@ -60,5 +60,5 @@ obj-$(CONFIG_ACPI_POWER_METER)	+= power_meter.o
+ 
+ # processor has its own "processor." module_param namespace
+ processor-y			:= processor_core.o processor_throttling.o
+-processor-y			+= processor_idle.o processor_thermal.o
++processor-y			+= processor_idle.o processor_thermal.o processor_mwait_table.o
+ processor-$(CONFIG_CPU_FREQ)	+= processor_perflib.o
+diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
+index cc61a62..db444a0 100644
+--- a/drivers/acpi/processor_idle.c
++++ b/drivers/acpi/processor_idle.c
+@@ -1088,6 +1088,9 @@ static int acpi_processor_setup_cpuidle(struct acpi_processor *pr)
+ 		state->target_residency = cx->latency * latency_factor;
+ 		state->power_usage = cx->power;
+ 
++		if (cx->entry_method == ACPI_CSTATE_FFH)
++			acpi_verify_mwait_data(state, cx);
++
+ 		state->flags = 0;
+ 		switch (cx->type) {
+ 			case ACPI_STATE_C1:
+diff --git a/drivers/acpi/processor_mwait_table.c b/drivers/acpi/processor_mwait_table.c
+new file mode 100644
+index 0000000..f29c28c
+--- /dev/null
++++ b/drivers/acpi/processor_mwait_table.c
+@@ -0,0 +1,102 @@
++/*
++ * processor_mwait_table.c: BIOS table verification/correction
++ *
++ * (C) Copyright 2009 Intel Corporation
++ * Authors:
++ *	Arjan van de Ven <arjan@linux.intel.com>
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License
++ * as published by the Free Software Foundation; version 2
++ * of the License.
++ */
++
++#include <asm/processor.h>
++#include <linux/acpi.h>
++#include <acpi/processor.h>
++#include <linux/cpuidle.h>
++
++
++#define ATLEAST 1
++#define ATMOST  2
++#define EXACTLY 3
++
++#define MAX_ENTRIES 12
++
++struct mwait_entry {
++	unsigned int		mwait_value;
++	unsigned long		exit_latency;
++	unsigned long		break_even_point;
++	int			compare_method;
++};
++
++struct cpu_entry {
++	int			vendor;
++	int			family;
++	int			model;
++
++	struct mwait_entry	entries[MAX_ENTRIES];	
++};
++
++static struct cpu_entry mwait_entries[] =
++{
++  /* Intel "Atom" CPUs  */
++  {.vendor = X86_VENDOR_INTEL, .family = 6, . model = 28,
++	.entries = { 
++			{0x00,   1,    1, ATLEAST}, 
++			{0x10,   2,   20, ATLEAST}, 
++			{0x30,  57,  300, ATLEAST}, 
++			{0x50,  64, 4000, ATLEAST}, 
++		   } 
++  },
++
++
++};
++
++
++static unsigned long 
++compare_and_set(unsigned long original, unsigned long new, int compare)
++{
++	if (compare == EXACTLY)
++		return new;
++	if (compare == ATLEAST && new > original)
++		return new;
++	if (compare == ATMOST && new < original)
++		return new;
++	return original;
++}
++
++
++void acpi_verify_mwait_data(struct cpuidle_state *state,
++			    struct acpi_processor_cx *cx)
++{
++#if defined(__i386__) || defined(__x86_64__)
++	int i;
++
++	struct cpuinfo_x86 *cpudata = &boot_cpu_data;
++	
++	
++	for (i = 0; i < ARRAY_SIZE(mwait_entries); i++) {
++		int j;
++		if (mwait_entries[i].vendor != cpudata->x86_vendor)
++			continue;
++		if (mwait_entries[i].family != cpudata->x86)
++			continue;
++		if (mwait_entries[i].model != cpudata->x86_model)
++			continue;
++		for (j = 0; j < ARRAY_SIZE(mwait_entries[i].entries); j++) {
++			if (!mwait_entries[i].entries[j].compare_method)
++				continue;
++			if (mwait_entries[i].entries[j].mwait_value != cx->address)
++				continue;
++			state->exit_latency = compare_and_set(state->exit_latency,
++				mwait_entries[i].entries[j].exit_latency,
++				mwait_entries[i].entries[j].compare_method);
++			state->target_residency = compare_and_set(state->target_residency,
++				mwait_entries[i].entries[j].break_even_point,
++				mwait_entries[i].entries[j].compare_method);
++			break;	
++		}
++	}
++#endif
++}
+diff --git a/include/acpi/processor.h b/include/acpi/processor.h
+index 740ac3a..175e4d1 100644
+--- a/include/acpi/processor.h
++++ b/include/acpi/processor.h
+@@ -352,5 +352,8 @@ static inline void acpi_thermal_cpufreq_exit(void)
+ 	return;
+ }
+ #endif
++extern void acpi_verify_mwait_data(struct cpuidle_state *state,
++                            struct acpi_processor_cx *cx);
++
+ 
+ #endif
+-- 
+1.6.2.5
+