linux-kernel - [PATCH 5.4 042/168] nvme/pci: Add sleep quirk for Samsung and Toshiba drives

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Message-Id: <20200310123639.646314392@linuxfoundation.org>
Date:   Tue, 10 Mar 2020 13:38:08 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jon Derrick <jonathan.derrick@...el.com>,
        Christoph Hellwig <hch@....de>,
        Shyjumon N <shyjumon.n@...el.com>,
        Keith Busch <kbusch@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 042/168] nvme/pci: Add sleep quirk for Samsung and Toshiba drives

From: Shyjumon N <shyjumon.n@...el.com>

[ Upstream commit 1fae37accfc5872af3905d4ba71dc6ab15829be7 ]

The Samsung SSD SM981/PM981 and Toshiba SSD KBG40ZNT256G on the Lenovo
C640 platform experience runtime resume issues when the SSDs are kept in
sleep/suspend mode for long time.

This patch applies the 'Simple Suspend' quirk to these configurations.
With this patch, the issue had not been observed in a 1+ day test.

Reviewed-by: Jon Derrick <jonathan.derrick@...el.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Shyjumon N <shyjumon.n@...el.com>
Signed-off-by: Keith Busch <kbusch@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/host/pci.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 570c75c92e293..c8e55674cf937 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2753,6 +2753,18 @@ static unsigned long check_vendor_combination_bug(struct pci_dev *pdev)
 		    (dmi_match(DMI_BOARD_NAME, "PRIME B350M-A") ||
 		     dmi_match(DMI_BOARD_NAME, "PRIME Z370-A")))
 			return NVME_QUIRK_NO_APST;
+	} else if ((pdev->vendor == 0x144d && (pdev->device == 0xa801 ||
+		    pdev->device == 0xa808 || pdev->device == 0xa809)) ||
+		   (pdev->vendor == 0x1e0f && pdev->device == 0x0001)) {
+		/*
+		 * Forcing to use host managed nvme power settings for
+		 * lowest idle power with quick resume latency on
+		 * Samsung and Toshiba SSDs based on suspend behavior
+		 * on Coffee Lake board for LENOVO C640
+		 */
+		if ((dmi_match(DMI_BOARD_VENDOR, "LENOVO")) &&
+		     dmi_match(DMI_BOARD_NAME, "LNVNB161216"))
+			return NVME_QUIRK_SIMPLE_SUSPEND;
 	}
 
 	return 0;
-- 
2.20.1