linux-kernel - [PATCH 5/5] net: usb: ax88179

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Date:   Mon, 18 Jul 2022 16:58:09 -0700
From:   justinpopo6@...il.com
To:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-usb@...r.kernel.org, jannh@...gle.com, jackychou@...x.com.tw,
        jesionowskigreg@...il.com, joalonsof@...il.com,
        justinpopo6@...il.com, pabeni@...hat.com, kuba@...nel.org,
        edumazet@...gle.com, davem@...emloft.net, f.fainelli@...il.com
Cc:     justin.chen@...adcom.com
Subject: [PATCH 5/5] net: usb: ax88179_178a: wol optimizations

From: Justin Chen <justinpopo6@...il.com>

- Check if wol is supported on reset instead of everytime get_wol
is called.
- Save wolopts in private data instead of relying on the HW to save it.
- Defer enabling WoL until suspend instead of enabling it everytime
set_wol is called.

Signed-off-by: Justin Chen <justinpopo6@...il.com>
---
 drivers/net/usb/ax88179_178a.c | 52 +++++++++++++++++++++++-------------------
 1 file changed, 28 insertions(+), 24 deletions(-)

diff --git a/drivers/net/usb/ax88179_178a.c b/drivers/net/usb/ax88179_178a.c
index cb7b89f..757c1d9b 100644
--- a/drivers/net/usb/ax88179_178a.c
+++ b/drivers/net/usb/ax88179_178a.c
@@ -171,6 +171,8 @@ struct ax88179_data {
 	u8  eee_active;
 	u16 rxctl;
 	u8 in_pm;
+	u32 wol_supported;
+	u32 wolopts;
 };
 
 struct ax88179_int_data {
@@ -400,6 +402,7 @@ ax88179_phy_write_mmd_indirect(struct usbnet *dev, u16 prtad, u16 devad,
 static int ax88179_suspend(struct usb_interface *intf, pm_message_t message)
 {
 	struct usbnet *dev = usb_get_intfdata(intf);
+	struct ax88179_data *priv = dev->driver_priv;
 	u16 tmp16;
 	u8 tmp8;
 
@@ -407,6 +410,19 @@ static int ax88179_suspend(struct usb_interface *intf, pm_message_t message)
 
 	usbnet_suspend(intf, message);
 
+	/* Enable WoL */
+	if (priv->wolopts) {
+		ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_MONITOR_MOD,
+				 1, 1, &tmp8);
+		if (priv->wolopts & WAKE_PHY)
+			tmp8 |= AX_MONITOR_MODE_RWLC;
+		if (priv->wolopts & WAKE_MAGIC)
+			tmp8 |= AX_MONITOR_MODE_RWMP;
+
+		ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_MONITOR_MOD,
+				  1, 1, &tmp8);
+	}
+
 	/* Disable RX path */
 	ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
 			 2, 2, &tmp16);
@@ -480,40 +496,22 @@ static void
 ax88179_get_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
 {
 	struct usbnet *dev = netdev_priv(net);
-	u8 opt;
-
-	if (ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_MONITOR_MOD,
-			     1, 1, &opt) < 0) {
-		wolinfo->supported = 0;
-		wolinfo->wolopts = 0;
-		return;
-	}
+	struct ax88179_data *priv = dev->driver_priv;
 
-	wolinfo->supported = WAKE_PHY | WAKE_MAGIC;
-	wolinfo->wolopts = 0;
-	if (opt & AX_MONITOR_MODE_RWLC)
-		wolinfo->wolopts |= WAKE_PHY;
-	if (opt & AX_MONITOR_MODE_RWMP)
-		wolinfo->wolopts |= WAKE_MAGIC;
+	wolinfo->supported = priv->wol_supported;
+	wolinfo->wolopts = priv->wolopts;
 }
 
 static int
 ax88179_set_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
 {
 	struct usbnet *dev = netdev_priv(net);
-	u8 opt = 0;
+	struct ax88179_data *priv = dev->driver_priv;
 
-	if (wolinfo->wolopts & ~(WAKE_PHY | WAKE_MAGIC))
+	if (wolinfo->wolopts & ~(priv->wol_supported))
 		return -EINVAL;
 
-	if (wolinfo->wolopts & WAKE_PHY)
-		opt |= AX_MONITOR_MODE_RWLC;
-	if (wolinfo->wolopts & WAKE_MAGIC)
-		opt |= AX_MONITOR_MODE_RWMP;
-
-	if (ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_MONITOR_MOD,
-			      1, 1, &opt) < 0)
-		return -EINVAL;
+	priv->wolopts = wolinfo->wolopts;
 
 	return 0;
 }
@@ -1643,6 +1641,12 @@ static int ax88179_reset(struct usbnet *dev)
 	ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_MEDIUM_STATUS_MODE,
 			  2, 2, tmp16);
 
+	/* Check if WoL is supported */
+	ax179_data->wol_supported = 0;
+	if (ax88179_read_cmd(dev, AX_ACCESS_MAC, AX_MONITOR_MOD,
+			     1, 1, &tmp) > 0)
+		ax179_data->wol_supported = WAKE_MAGIC | WAKE_PHY;
+
 	ax88179_led_setting(dev);
 
 	ax179_data->eee_enabled = 0;
-- 
2.7.4