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Subject[PATCH v4] pci: dwc: dra7xx: Add shutdown handler to cleanly turn off clocks
Date
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@ti.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
---

Changes in v4:

* Added the missing changes from v2!

Changes in v3:

* Pushed the function outside #ifdef CONFIG_PM_SLEEP.
* Added more details to commit log.

Changes in v2:

* used a local dev pointer instead of dereferencing dev at multiple places.
* dra7xx_pcie_stop_link before disabling clks in the shutdown path.

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 34427a6..d084800 100644
--- a/drivers/pci/dwc/pci-dra7xx.c
+++ b/drivers/pci/dwc/pci-dra7xx.c
@@ -794,6 +794,22 @@ 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,
@@ -807,5 +823,6 @@ static int dra7xx_pcie_resume_noirq(struct device *dev)
.suppress_bind_attrs = true,
.pm = &dra7xx_pcie_pm_ops,
},
+ .shutdown = dra7xx_pcie_shutdown,
};
builtin_platform_driver_probe(dra7xx_pcie_driver, dra7xx_pcie_probe);
--
1.9.1
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