[BACKPORT 4.14.y 10/18] PCI: dra7xx: Add shutdown handler to cleanly turn off clocks

[Mathieu Poirier]

From: Keerthy <j-keer...@ti.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-keer...@ti.com>
Signed-off-by: Bjorn Helgaas <bhelg...@google.com>
Acked-by: Kishon Vijay Abraham I <kis...@ti.com>
Signed-off-by: Mathieu Poirier <mathieu.poir...@linaro.org>
---
 drivers/pci/dwc/pci-dra7xx.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/pci/dwc/pci-dra7xx.c b/drivers/pci/dwc/pci-dra7xx.c
index 7f5dfa169d0f..2e0d0b29cdcb 100644
--- a/drivers/pci/dwc/pci-dra7xx.c
+++ b/drivers/pci/dwc/pci-dra7xx.c
@@ -817,6 +817,22 @@ static int dra7xx_pcie_resume_noirq(struct device *dev)
 }
 #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_pcie_driver = {
                .suppress_bind_attrs = true,
                .pm     = &dra7xx_pcie_pm_ops,
        },
+       .shutdown = dra7xx_pcie_shutdown,
 };
 builtin_platform_driver_probe(dra7xx_pcie_driver, dra7xx_pcie_probe);
-- 
2.17.1