blob: 167a8533d29061901b47be5433527bb96df9b6a4 [file] [log] [blame]
From 46057cfc4f53cbfb6c343bda3e0c27b0c52b9d96 Mon Sep 17 00:00:00 2001
From: Arun Parameswaran <arun.parameswaran@broadcom.com>
Date: Fri, 14 Feb 2020 13:47:46 -0800
Subject: [PATCH] net: phy: restore mdio regs in the iproc mdio driver
commit 6f08e98d62799e53c89dbf2c9a49d77e20ca648c upstream.
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>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/drivers/net/phy/mdio-bcm-iproc.c b/drivers/net/phy/mdio-bcm-iproc.c
index 7d0f388d8db8..fd0daf63be97 100644
--- a/drivers/net/phy/mdio-bcm-iproc.c
+++ b/drivers/net/phy/mdio-bcm-iproc.c
@@ -180,6 +180,23 @@ 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 */ },
@@ -190,6 +207,9 @@ 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,
--
2.7.4