[PATCH] acpi: Add D3 cold state

[Lin Ming <ming.m.lin@intel.com>]

_SxW returns an Integer containing the lowest D-state supported in state
Sx. If OSPM has not indicated that it supports _PR3, then the value “3”
corresponds to D3.  If it has indicated _PR3 support, the value “3”
represents D3hot and the value “4” represents D3cold.

Linux does set _OSC._PR3, so we should fix it to expect that _SxW can
return 4.

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
---
 drivers/acpi/bus.c     |    2 +-
 drivers/pci/pci-acpi.c |    2 ++
 include/acpi/actypes.h |    5 +++--
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 9749980..d1e06c1 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -227,7 +227,7 @@ static int __acpi_bus_set_power(struct acpi_device *device, int state)
 	acpi_status status = AE_OK;
 	char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 
-	if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
+	if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
 		return -EINVAL;
 
 	/* Make sure this is a valid target state */
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index 7c3b18e..d36f41e 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -195,6 +195,8 @@ static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
 		return PCI_D2;
 	case ACPI_STATE_D3:
 		return PCI_D3hot;
+	case ACPI_STATE_D3_COLD:
+		return PCI_D3cold;
 	}
 	return PCI_POWER_ERROR;
 }
diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h
index 64f838b..f72cbe5 100644
--- a/include/acpi/actypes.h
+++ b/include/acpi/actypes.h
@@ -501,8 +501,9 @@ typedef u64 acpi_integer;
 #define ACPI_STATE_D1                   (u8) 1
 #define ACPI_STATE_D2                   (u8) 2
 #define ACPI_STATE_D3                   (u8) 3
-#define ACPI_D_STATES_MAX               ACPI_STATE_D3
-#define ACPI_D_STATE_COUNT              4
+#define ACPI_STATE_D3_COLD              (u8) 4
+#define ACPI_D_STATES_MAX               ACPI_STATE_D3_COLD
+#define ACPI_D_STATE_COUNT              5
 
 #define ACPI_STATE_C0                   (u8) 0
 #define ACPI_STATE_C1                   (u8) 1
-- 
1.7.4.4



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