netdev - [PATCH net-next v2 5/7] net: phy: smsc: prepare for making edpd wait period configurable

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Date:   Sun, 2 Apr 2023 17:14:35 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>,
        Chris Healy <cphealy@...il.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH net-next v2 5/7] net: phy: smsc: prepare for making edpd wait
 period configurable

Add a member edpd_max_wait_ms to the private data structure in preparation
of making the wait period configurable by supporting the edpd phy tunable.

v2:
- rename constant to EDPD_MAX_WAIT_DFLT_MS

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 drivers/net/phy/smsc.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/net/phy/smsc.c b/drivers/net/phy/smsc.c
index 25b9cd474..659a3ab10 100644
--- a/drivers/net/phy/smsc.c
+++ b/drivers/net/phy/smsc.c
@@ -33,6 +33,8 @@
 #define SPECIAL_CTRL_STS_AMDIX_ENABLE_	0x4000
 #define SPECIAL_CTRL_STS_AMDIX_STATE_	0x2000
 
+#define EDPD_MAX_WAIT_DFLT_MS		640
+
 struct smsc_hw_stat {
 	const char *string;
 	u8 reg;
@@ -46,6 +48,7 @@ static struct smsc_hw_stat smsc_hw_stats[] = {
 struct smsc_phy_priv {
 	unsigned int edpd_enable:1;
 	unsigned int edpd_mode_set_by_user:1;
+	unsigned int edpd_max_wait_ms;
 };
 
 static int smsc_phy_ack_interrupt(struct phy_device *phydev)
@@ -213,9 +216,13 @@ int lan87xx_read_status(struct phy_device *phydev)
 	if (err)
 		return err;
 
-	if (!phydev->link && priv && priv->edpd_enable) {
+	if (!phydev->link && priv && priv->edpd_enable &&
+	    priv->edpd_max_wait_ms) {
+		unsigned int max_wait = priv->edpd_max_wait_ms * 1000;
+		int rc;
+
 		/* Disable EDPD to wake up PHY */
-		int rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
+		rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
 		if (rc < 0)
 			return rc;
 
@@ -229,7 +236,7 @@ int lan87xx_read_status(struct phy_device *phydev)
 		 */
 		read_poll_timeout(phy_read, rc,
 				  rc & MII_LAN83C185_ENERGYON || rc < 0,
-				  10000, 640000, true, phydev,
+				  10000, max_wait, true, phydev,
 				  MII_LAN83C185_CTRL_STATUS);
 		if (rc < 0)
 			return rc;
@@ -299,6 +306,7 @@ int smsc_phy_probe(struct phy_device *phydev)
 		return -ENOMEM;
 
 	priv->edpd_enable = true;
+	priv->edpd_max_wait_ms = EDPD_MAX_WAIT_DFLT_MS;
 
 	if (device_property_present(dev, "smsc,disable-energy-detect"))
 		priv->edpd_enable = false;
-- 
2.40.0