[PATCH v4 2/4] i2c: designware: Convert PCI driver to use shutdown hook

[William A. Kennington III]

Convert the PCI driver to use the new i2c_dw_shutdown() hook, allowing
the controller to gracefully NACK master requests during system shutdown.

Signed-off-by: William A. Kennington III <william@xxxxxxxxxxxxxxx>
---
 drivers/i2c/busses/i2c-designware-pcidrv.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/i2c/busses/i2c-designware-pcidrv.c b/drivers/i2c/busses/i2c-designware-pcidrv.c
index f21f9877c040..ab21d4414681 100644
--- a/drivers/i2c/busses/i2c-designware-pcidrv.c
+++ b/drivers/i2c/busses/i2c-designware-pcidrv.c
@@ -356,10 +356,24 @@ static const struct pci_device_id i2c_designware_pci_ids[] = {
 };
 MODULE_DEVICE_TABLE(pci, i2c_designware_pci_ids);
 
+static void i2c_dw_pci_shutdown(struct pci_dev *pdev)
+{
+	struct dw_i2c_dev *i_dev;
+
+	i_dev = pci_get_drvdata(pdev);
+	if (!i_dev)
+		return;
+
+	pm_runtime_disable(&pdev->dev);
+	if (!pm_runtime_status_suspended(&pdev->dev))
+		i2c_dw_shutdown(i_dev);
+}
+
 static struct pci_driver dw_i2c_driver = {
 	.name		= DRIVER_NAME,
 	.probe		= i2c_dw_pci_probe,
 	.remove		= i2c_dw_pci_remove,
+	.shutdown	= i2c_dw_pci_shutdown,
 	.driver         = {
 		.pm	= pm_ptr(&i2c_dw_dev_pm_ops),
 	},

-- 
2.54.0.563.g4f69b47b94-goog