Thread (3 messages) 3 messages, 3 authors, 2021-06-10

Re: [PATCH v1 1/1] net: usb: asix: ax88772: manage PHY PM from MAC

From: Marek Szyprowski <m.szyprowski@samsung.com>
Date: 2021-06-10 22:23:01
Also in: lkml, netdev

Hi Oleksij,

On 10.06.2021 16:20, Oleksij Rempel wrote:
Take over PHY power management, otherwise PHY framework will try to
access ASIX MDIO bus before MAC resume was completed.

Fixes: e532a096be0e ("net: usb: asix: ax88772: add phylib support")
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reported-by: Jon Hunter <jonathanh@nvidia.com>
Suggested-by: Heiner Kallweit <hkallweit1@gmail.com>
This fixes the issues observed on my test systems. Thanks!

Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
quoted hunk ↗ jump to hunk
---
  drivers/net/usb/asix_devices.c | 43 ++++++++++------------------------
  1 file changed, 12 insertions(+), 31 deletions(-)
diff --git a/drivers/net/usb/asix_devices.c b/drivers/net/usb/asix_devices.c
index 8a477171e8f5..aec97b021a73 100644
--- a/drivers/net/usb/asix_devices.c
+++ b/drivers/net/usb/asix_devices.c
@@ -598,6 +598,9 @@ static void ax88772_suspend(struct usbnet *dev)
  	struct asix_common_private *priv = dev->driver_priv;
  	u16 medium;
  
+	if (netif_running(dev->net))
+		phy_stop(priv->phydev);
+
  	/* Stop MAC operation */
  	medium = asix_read_medium_status(dev, 1);
  	medium &= ~AX_MEDIUM_RE;
@@ -605,14 +608,6 @@ static void ax88772_suspend(struct usbnet *dev)
  
  	netdev_dbg(dev->net, "ax88772_suspend: medium=0x%04x\n",
  		   asix_read_medium_status(dev, 1));
-
-	/* Preserve BMCR for restoring */
-	priv->presvd_phy_bmcr =
-		asix_mdio_read_nopm(dev->net, dev->mii.phy_id, MII_BMCR);
-
-	/* Preserve ANAR for restoring */
-	priv->presvd_phy_advertise =
-		asix_mdio_read_nopm(dev->net, dev->mii.phy_id, MII_ADVERTISE);
  }
  
  static int asix_suspend(struct usb_interface *intf, pm_message_t message)
@@ -626,39 +621,22 @@ static int asix_suspend(struct usb_interface *intf, pm_message_t message)
  	return usbnet_suspend(intf, message);
  }
  
-static void ax88772_restore_phy(struct usbnet *dev)
-{
-	struct asix_common_private *priv = dev->driver_priv;
-
-	if (priv->presvd_phy_advertise) {
-		/* Restore Advertisement control reg */
-		asix_mdio_write_nopm(dev->net, dev->mii.phy_id, MII_ADVERTISE,
-				     priv->presvd_phy_advertise);
-
-		/* Restore BMCR */
-		if (priv->presvd_phy_bmcr & BMCR_ANENABLE)
-			priv->presvd_phy_bmcr |= BMCR_ANRESTART;
-
-		asix_mdio_write_nopm(dev->net, dev->mii.phy_id, MII_BMCR,
-				     priv->presvd_phy_bmcr);
-
-		priv->presvd_phy_advertise = 0;
-		priv->presvd_phy_bmcr = 0;
-	}
-}
-
  static void ax88772_resume(struct usbnet *dev)
  {
+	struct asix_common_private *priv = dev->driver_priv;
  	int i;
  
  	for (i = 0; i < 3; i++)
  		if (!ax88772_hw_reset(dev, 1))
  			break;
-	ax88772_restore_phy(dev);
+
+	if (netif_running(dev->net))
+		phy_start(priv->phydev);
  }
  
  static void ax88772a_resume(struct usbnet *dev)
  {
+	struct asix_common_private *priv = dev->driver_priv;
  	int i;
  
  	for (i = 0; i < 3; i++) {
@@ -666,7 +644,8 @@ static void ax88772a_resume(struct usbnet *dev)
  			break;
  	}
  
-	ax88772_restore_phy(dev);
+	if (netif_running(dev->net))
+		phy_start(priv->phydev);
  }
  
  static int asix_resume(struct usb_interface *intf)
@@ -722,6 +701,8 @@ static int ax88772_init_phy(struct usbnet *dev)
  		return ret;
  	}
  
+	priv->phydev->mac_managed_pm = 1;
+
  	phy_attached_info(priv->phydev);
  
  	return 0;
Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland
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