The patch titled
acpi: enable C3 Power State on Dell Inspiron 8200
has been added to the -mm tree. Its filename is
acpi-enable-c3-power-state-on-dell-inspiron-8200.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: acpi: enable C3 Power State on Dell Inspiron 8200
From: Arjan van de Ven <arjan@xxxxxxxxxxxxx>
Taken from http://bugzilla.kernel.org/show_bug.cgi?id=8703
Cc: Dag Bakke <dag@xxxxxxxxx>
Cc: Len Brown <lenb@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/acpi/processor_idle.c | 24 ++++++++++++++++++++++--
1 files changed, 22 insertions(+), 2 deletions(-)
diff -puN drivers/acpi/processor_idle.c~acpi-enable-c3-power-state-on-dell-inspiron-8200 drivers/acpi/processor_idle.c
--- a/drivers/acpi/processor_idle.c~acpi-enable-c3-power-state-on-dell-inspiron-8200
+++ a/drivers/acpi/processor_idle.c
@@ -67,6 +67,8 @@ ACPI_MODULE_NAME("processor_idle");
#define C2_OVERHEAD 1 /* 1us */
#define C3_OVERHEAD 1 /* 1us */
+static int forced_c3;
+
void acpi_max_cstate_changed(void)
{
/* Driver will reset devices' max cstate limit */
@@ -115,6 +117,20 @@ static int set_max_cstate(struct dmi_sys
return 0;
}
+/*
+ * Some (Dell) machines have a too large C3 latency set, but it still works completely.
+ * Dell provides a driver for other operating systems to hack around this bug, so we know
+ * it's safe.
+ */
+static int dmi_force_c3(struct dmi_system_id *id)
+{
+ forced_c3 = 1;
+
+ printk(KERN_NOTICE PREFIX "%s detected - Force enabling C3.", id->ident);
+
+ return 0;
+}
+
/* Actually this shouldn't be __cpuinitdata, would be better to fix the
callers to only run once -AK */
static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = {
@@ -173,6 +189,9 @@ static struct dmi_system_id __cpuinitdat
DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")},
(void *)2},
+ { dmi_force_c3, "Dell Inspiron 8200", {
+ DMI_MATCH(DMI_SYS_VENDOR,"Dell Computer Corporation"),
+ DMI_MATCH(DMI_PRODUCT_NAME,"Inspiron 8200") }, NULL},
{},
};
@@ -487,11 +506,12 @@ static void acpi_processor_power_verify_
* C3 latency must be less than or equal to 1000
* microseconds.
*/
- else if (cx->latency > ACPI_PROCESSOR_MAX_C3_LATENCY) {
+ if (cx->latency > ACPI_PROCESSOR_MAX_C3_LATENCY && !forced_c3) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"latency too large [%d]\n", cx->latency));
return;
- }
+ } else if (forced_c3)
+ cx->latency = ACPI_PROCESSOR_MAX_C3_LATENCY;
/*
* PIIX4 Erratum #18: We don't support C3 when Type-F (fast)
_
Patches currently in -mm which might be from arjan@xxxxxxxxxxxxx are
acpi-enable-c3-power-state-on-dell-inspiron-8200.patch
vdso-print-fatal-signals.patch
intel-iommu-dmar-detection-and-parsing-logic.patch
intel-iommu-pci-generic-helper-function.patch
intel-iommu-pci-generic-helper-function-fix.patch
intel-iommu-clflush_cache_range-now-takes-size-param.patch
intel-iommu-iova-allocation-and-management-routines.patch
intel-iommu-iova-allocation-and-management-routines-fix.patch
intel-iommu-intel-iommu-driver.patch
intel-iommu-intel-iommu-driver-fix.patch
intel-iommu-intel-iommu-driver-fix-2.patch
intel-iommu-avoid-memory-allocation-failures-in-dma-map-api-calls.patch
intel-iommu-intel-iommu-cmdline-option-forcedac.patch
intel-iommu-dmar-fault-handling-support.patch
intel-iommu-iommu-gfx-workaround.patch
intel-iommu-iommu-floppy-workaround.patch
intel-iommu-iommu-floppy-workaround-fix.patch
-
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