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

commit 6f08e98d62 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: bb1a619735 ("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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Arun Parameswaran 2020-02-14 13:47:46 -08:00 committed by Greg Kroah-Hartman
parent 248b775139
commit bd53844bc9
1 changed files with 20 additions and 0 deletions
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20
drivers/net/phy/mdio-bcm-iproc.c
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@ -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,