linux-kernel - [PATCH v2] nvme/pci: Add quick suspend quirk for Sc7280 Platform

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Date:   Thu, 10 Feb 2022 22:25:04 +0530
From:   Nitin Rawat <quic_nitirawa@...cinc.com>
To:     Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Sagi Grimberg <sagi@...mberg.me>,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Nitin Rawat <quic_nitirawa@...cinc.com>,
        Shaik Sajida Bhanu <quic_c_sbhanu@...cinc.com>
Subject: [PATCH v2] nvme/pci: Add quick suspend quirk for Sc7280 Platform

Enable quick suspend quirks for Sc7280 platform, where power
to nvme device is removed during suspend-resume process. This
is done to avoid the failure dring resume.

This enables simple suspend path for this platform.

Signed-off-by: Nitin Rawat <quic_nitirawa@...cinc.com>
Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@...cinc.com>
---

Change from v1-v2:

*Moving the check condition outside vendor/device check
 to make this platform specific

---
 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 6a99ed6..fa25d9fab 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -3032,6 +3032,13 @@ static unsigned long check_vendor_combination_bug(struct pci_dev *pdev)
 		if ((dmi_match(DMI_BOARD_VENDOR, "LENOVO")) &&
 		     dmi_match(DMI_BOARD_NAME, "LNVNB161216"))
 			return NVME_QUIRK_SIMPLE_SUSPEND;
+	} else if (of_machine_is_compatible("qcom,sc7280")) {
+		/*
+		 * Append quick suspend quirks for sc7280 platforms
+		 * so that simple suspend path is executed for this
+		 * platform to avoid any resume failure.
+		 */
+		return NVME_QUIRK_SIMPLE_SUSPEND;
 	}

 	return 0;
--
2.7.4