linux-kernel - [PATCH v3] nvme/pci: Add quick suspend quirk for Sc7280 Platform

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Message-Id: <1644526408-10834-1-git-send-email-quic_nitirawa@quicinc.com>
Date:   Fri, 11 Feb 2022 02:23:28 +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 v3] 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 v2-v3:
* changed if/else condition

---

 drivers/nvme/host/pci.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 6a99ed6..1dff749 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -3034,6 +3034,15 @@ static unsigned long check_vendor_combination_bug(struct pci_dev *pdev)
 			return NVME_QUIRK_SIMPLE_SUSPEND;
 	}

+	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