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From 49e089f9173aaf001ed82a250f8ff0ce6f585ac4 Mon Sep 17 00:00:00 2001
From: Valentine Barshak <valentine.barshak@cogentembedded.com>
Date: Fri, 22 Feb 2019 02:55:02 +0300
Subject: [PATCH 072/122] nvme: Workaround Samsung 970 Pro power state issues
Sometimes Samsung 970 Pro NVME device just disappears.
Looks like it drops into deep sleep mode during I/O.
This behaviour has been observed at least on R-Car
Gen3 H3ULCB and M3ULC Kingfisher boards.
Add a quirk that disables deep sleep mode for the device.
Signed-off-by: Valentine Barshak <valentine.barshak@cogentembedded.com>
---
drivers/nvme/host/pci.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index afb9987..a6c0789 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2557,6 +2557,8 @@ static const struct pci_device_id nvme_id_table[] = {
.driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, },
{ PCI_DEVICE(0x1c5f, 0x0540), /* Memblaze Pblaze4 adapter */
.driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, },
+ { PCI_DEVICE(0x144d, 0xa808), /* Samsung 970 Pro */
+ .driver_data = NVME_QUIRK_NO_DEEPEST_PS },
{ PCI_DEVICE(0x144d, 0xa821), /* Samsung PM1725 */
.driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, },
{ PCI_DEVICE(0x144d, 0xa822), /* Samsung PM1725a */
--
2.7.4
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