net: phy: realtek: add delay to resume path of certain internal PHY's

Internal PHY's from RTL8168h up may not be instantly ready after calling
genphy_resume(). So far r8169 network driver adds the needed delay, but
better handle this in the PHY driver. The network driver may miss other
places where the PHY is resumed.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/realtek.c

@@ -11,6 +11,7 @@
 #include <linux/bitops.h>
 #include <linux/phy.h>
 #include <linux/module.h>
+#include <linux/delay.h>
 
 #define RTL821x_PHYSR				0x11
 #define RTL821x_PHYSR_DUPLEX			BIT(13)
@@ -526,6 +527,16 @@ static int rtl8125_match_phy_device(struct phy_device *phydev)
 	       rtlgen_supports_2_5gbps(phydev);
 }
 
+static int rtlgen_resume(struct phy_device *phydev)
+{
+	int ret = genphy_resume(phydev);
+
+	/* Internal PHY's from RTL8168h up may not be instantly ready */
+	msleep(20);
+
+	return ret;
+}
+
 static struct phy_driver realtek_drvs[] = {
 	{
 		PHY_ID_MATCH_EXACT(0x00008201),
@@ -609,7 +620,7 @@ static struct phy_driver realtek_drvs[] = {
 		.match_phy_device = rtlgen_match_phy_device,
 		.read_status	= rtlgen_read_status,
 		.suspend	= genphy_suspend,
-		.resume		= genphy_resume,
+		.resume		= rtlgen_resume,
 		.read_page	= rtl821x_read_page,
 		.write_page	= rtl821x_write_page,
 		.read_mmd	= rtlgen_read_mmd,
@@ -621,7 +632,7 @@ static struct phy_driver realtek_drvs[] = {
 		.config_aneg	= rtl8125_config_aneg,
 		.read_status	= rtl8125_read_status,
 		.suspend	= genphy_suspend,
-		.resume		= genphy_resume,
+		.resume		= rtlgen_resume,
 		.read_page	= rtl821x_read_page,
 		.write_page	= rtl821x_write_page,
 		.read_mmd	= rtl8125_read_mmd,