[1/2,SRU,C] SAUCE: pci: prevent sk hynix nvme from entering D3

Message ID 20181106105314.30069-4-acelan.kao@canonical.com
State New
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  • [1/2,SRU,C] SAUCE: pci: prevent sk hynix nvme from entering D3
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Commit Message

AceLan Kao Nov. 6, 2018, 10:53 a.m.
BugLink: https://bugs.launchpad.net/bugs/1801875

It leads to the power consumption raises to 2.2W during s2idle, while
it consumes less than 1W during long idle if put SK hynix nvme to D3
and then enter s2idle.
From SK hynix FE, MS Windows doesn't put nvme to D3, and uses its own
APST feature to do the power management.
To leverage its APST feature during s2idle, we can't disable nvme
device while suspending, too.

BTW, prevent it from entering D3 will increase the power consumtion around
0.13W ~ 0.15W during short/long idle, and the power consumption during
s2idle becomes 0.77W.

Signed-off-by: AceLan Kao <acelan.kao@canonical.com>
 drivers/pci/quirks.c    | 1 +
 include/linux/pci_ids.h | 2 ++
 2 files changed, 3 insertions(+)


diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index f65fd0a067aa..56d9341822d1 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
    occur when mode detecting */
 				PCI_CLASS_STORAGE_IDE, 8, quirk_no_ata_d3);
  * This was originally an Alpha-specific thing, but it really fits here.
diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index bf85e152af05..8cb5dbeb5ed4 100644
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -3084,4 +3084,6 @@ 
 #define PCI_VENDOR_ID_NCUBE		0x10ff
+#define PCI_VENDOR_ID_SK_HYNIX		0x1c5c
 #endif /* _LINUX_PCI_IDS_H */