linux-kernel - [PATCH 9/9] nvme-apple: Add support for suspend/resume

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Date:   Mon, 21 Mar 2022 17:50:49 +0100
From:   Sven Peter <sven@...npeter.dev>
To:     Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>
Cc:     Sven Peter <sven@...npeter.dev>, Hector Martin <marcan@...can.st>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Rob Herring <robh+dt@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Marc Zyngier <maz@...nel.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org
Subject: [PATCH 9/9] nvme-apple: Add support for suspend/resume

From: Hector Martin <marcan@...can.st>

Signed-off-by: Hector Martin <marcan@...can.st>
Signed-off-by: Sven Peter <sven@...npeter.dev>
---
 drivers/nvme/host/apple.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/drivers/nvme/host/apple.c b/drivers/nvme/host/apple.c
index d89b4ab80169..c949a18ec690 100644
--- a/drivers/nvme/host/apple.c
+++ b/drivers/nvme/host/apple.c
@@ -1514,6 +1514,36 @@ static void apple_nvme_shutdown(struct platform_device *pdev)
 		apple_rtkit_shutdown(anv->rtk);
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int apple_nvme_resume(struct device *dev)
+{
+	struct apple_nvme *anv = dev_get_drvdata(dev);
+
+	return  nvme_reset_ctrl(&anv->ctrl);
+}
+
+static int apple_nvme_suspend(struct device *dev)
+{
+	struct apple_nvme *anv = dev_get_drvdata(dev);
+	int ret = 0;
+
+	apple_nvme_disable(anv, true);
+
+	if (apple_rtkit_is_running(anv->rtk))
+		ret = apple_rtkit_shutdown(anv->rtk);
+
+	writel_relaxed(0, anv->mmio_coproc + APPLE_ANS_COPROC_CPU_CONTROL);
+	(void)readl_relaxed(anv->mmio_coproc + APPLE_ANS_COPROC_CPU_CONTROL);
+
+	return ret;
+}
+
+static const struct dev_pm_ops apple_nvme_pm_ops = {
+	.suspend	= apple_nvme_suspend,
+	.resume		= apple_nvme_resume,
+};
+#endif
+
 static const struct of_device_id apple_nvme_of_match[] = {
 	{ .compatible = "apple,nvme-ans2" },
 	{},
@@ -1524,6 +1554,9 @@ static struct platform_driver apple_nvme_driver = {
 	.driver = {
 		.name = "nvme-apple",
 		.of_match_table = apple_nvme_of_match,
+#ifdef CONFIG_PM_SLEEP
+		.pm = &apple_nvme_pm_ops,
+#endif
 	},
 	.probe = apple_nvme_probe,
 	.remove = apple_nvme_remove,
-- 
2.25.1