linux-kernel - [PATCH 4.14 052/105] PCI: dra7xx: Add shutdown handler to cleanly turn off clocks

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Date:   Mon, 11 Nov 2019 19:28:22 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Keerthy <j-keerthy@...com>, Bjorn Helgaas <bhelgaas@...gle.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
Subject: [PATCH 4.14 052/105] PCI: dra7xx: Add shutdown handler to cleanly turn off clocks

From: Keerthy <j-keerthy@...com>

commit 9c049bea083fea21373b8baf51fe49acbe24e105 upstream

Add shutdown handler to cleanly turn off clocks.  This will help in cases of
kexec where in a new kernel can boot abruptly.

Signed-off-by: Keerthy <j-keerthy@...com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Acked-by: Kishon Vijay Abraham I <kishon@...com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/pci/dwc/pci-dra7xx.c |   17 +++++++++++++++++
 1 file changed, 17 insertions(+)

--- a/drivers/pci/dwc/pci-dra7xx.c
+++ b/drivers/pci/dwc/pci-dra7xx.c
@@ -817,6 +817,22 @@ static int dra7xx_pcie_resume_noirq(stru
 }
 #endif
 
+void dra7xx_pcie_shutdown(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
+	int ret;
+
+	dra7xx_pcie_stop_link(dra7xx->pci);
+
+	ret = pm_runtime_put_sync(dev);
+	if (ret < 0)
+		dev_dbg(dev, "pm_runtime_put_sync failed\n");
+
+	pm_runtime_disable(dev);
+	dra7xx_pcie_disable_phy(dra7xx);
+}
+
 static const struct dev_pm_ops dra7xx_pcie_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(dra7xx_pcie_suspend, dra7xx_pcie_resume)
 	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(dra7xx_pcie_suspend_noirq,
@@ -830,5 +846,6 @@ static struct platform_driver dra7xx_pci
 		.suppress_bind_attrs = true,
 		.pm	= &dra7xx_pcie_pm_ops,
 	},
+	.shutdown = dra7xx_pcie_shutdown,
 };
 builtin_platform_driver_probe(dra7xx_pcie_driver, dra7xx_pcie_probe);