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From:   AceLan Kao <acelan.kao@canonical.com>
To:     Keith Busch <keith.busch@intel.com>, Jens Axboe <axboe@fb.com>,
        Christoph Hellwig <hch@lst.de>,
        Sagi Grimberg <sagi@grimberg.me>,
        Bjorn Helgaas <bhelgaas@google.com>,
        linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-pci@vger.kernel.org
Subject: [PATCH 1/2] pci: prevent sk hynix nvme from entering D3
Date:   Tue,  6 Nov 2018 10:04:01 +0800
Message-Id: <20181106020402.21120-1-acelan.kao@canonical.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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 4700d24e5d55..b7e6492e8311 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -1332,6 +1332,7 @@ DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_AL, PCI_ANY_ID,
    occur when mode detecting */
 DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_VIA, PCI_ANY_ID,
 				PCI_CLASS_STORAGE_IDE, 8, quirk_no_ata_d3);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SK_HYNIX, 0x1527, 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 69f0abe1ba1a..5f5adda07de0 100644
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -3090,4 +3090,6 @@
 
 #define PCI_VENDOR_ID_NCUBE		0x10ff
 
+#define PCI_VENDOR_ID_SK_HYNIX		0x1c5c
+
 #endif /* _LINUX_PCI_IDS_H */
-- 
2.17.1