net: phy: restore mdio regs in the iproc mdio driver

The mii management register in iproc mdio block
does not have a retention register so it is lost on suspend.
Save and restore value of register while resuming from suspend.

Fixes: bb1a619735b4 ("net: phy: Initialize mdio clock at probe function")
Signed-off-by: Arun Parameswaran <arun.parameswaran@broadcom.com>
Signed-off-by: Scott Branden <scott.branden@broadcom.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/mdio-bcm-iproc.c b/drivers/net/phy/mdio-bcm-iproc.c
index 7e9975d..f1ded03 100644 (file)
--- a/drivers/net/phy/mdio-bcm-iproc.c
+++ b/drivers/net/phy/mdio-bcm-iproc.c
@@ -178,6 +178,23 @@ static int iproc_mdio_remove(struct platform_device *pdev)
        return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+int iproc_mdio_resume(struct device *dev)
+{
+       struct platform_device *pdev = to_platform_device(dev);
+       struct iproc_mdio_priv *priv = platform_get_drvdata(pdev);
+
+       /* restore the mii clock configuration */
+       iproc_mdio_config_clk(priv->base);
+
+       return 0;
+}
+
+static const struct dev_pm_ops iproc_mdio_pm_ops = {
+       .resume = iproc_mdio_resume
+};
+#endif /* CONFIG_PM_SLEEP */
+
 static const struct of_device_id iproc_mdio_of_match[] = {
        { .compatible = "brcm,iproc-mdio", },
        { /* sentinel */ },
@@ -188,6 +205,9 @@ static struct platform_driver iproc_mdio_driver = {
        .driver = {
                .name = "iproc-mdio",
                .of_match_table = iproc_mdio_of_match,
+#ifdef CONFIG_PM_SLEEP
+               .pm = &iproc_mdio_pm_ops,
+#endif
        },
        .probe = iproc_mdio_probe,
        .remove = iproc_mdio_remove,