linux-kernel - [PATCH v2] nvme/pci: Add DEEPEST_PS quirk for Lenovo N60z laptop

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Message-ID: <C0A44727E997523C+20240703101513.72590-1-wangyuli@uniontech.com>
Date: Wed,  3 Jul 2024 18:15:13 +0800
From: WangYuli <wangyuli@...ontech.com>
To: kbusch@...nel.org,
	axboe@...com,
	hch@....de,
	sagi@...mberg.me,
	guanwentao@...ontech.com,
	huanglin@...ontech.com
Cc: linux-nvme@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	WangYuli <wangyuli@...ontech.com>
Subject: [PATCH v2] nvme/pci: Add DEEPEST_PS quirk for Lenovo N60z laptop

There is a hardware power-saving problem with the Lenovo N60z
board. When turn it on and leave it for 30 minutes, there is a
20% chance that a nvme disk will not wake up until reboot.

Signed-off-by: hmy <huanglin@...ontech.com>
Signed-off-by: Wentao Guan <guanwentao@...ontech.com>
Signed-off-by: WangYuli <wangyuli@...ontech.com>
---
 drivers/nvme/host/pci.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 282d808400c5..4c840d468fce 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2903,6 +2903,13 @@ static unsigned long check_vendor_combination_bug(struct pci_dev *pdev)
 			return NVME_QUIRK_SIMPLE_SUSPEND;
 	}
 
+	/*
+	 * NVMe SSD drops off the PCIe bus after system idle
+	 * for 30 minuites on a Lenovo N60z board.
+	 */
+	if (dmi_match(DMI_BOARD_NAME, "LXKT-ZXEG-N6"))
+		return NVME_QUIRK_NO_DEEPEST_PS;
+
 	return 0;
 }
 
-- 
2.43.4