diff options
Diffstat (limited to 'meta-moblin/packages/linux/linux-moblin-2.6.31.5/linux-2.6.32-acpi-cstate-fixup.patch')
| -rw-r--r-- | meta-moblin/packages/linux/linux-moblin-2.6.31.5/linux-2.6.32-acpi-cstate-fixup.patch | 173 |
1 files changed, 0 insertions, 173 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 deleted file mode 100644 index 6a1204d4c1..0000000000 --- a/meta-moblin/packages/linux/linux-moblin-2.6.31.5/linux-2.6.32-acpi-cstate-fixup.patch +++ /dev/null @@ -1,173 +0,0 @@ -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 - |