Merge branch 'net-bcmasp-phy-managements-fixes'

Justin Chen says:

====================
net: bcmasp: phy managements fixes

Fix two issues.

- The unimac may be put in a bad state if PHY RX clk doesn't exist
  during reset. Work around this by bringing the unimac out of reset
  during phy up.

- Remove redundant phy_{suspend/resume}
====================

Link: https://lore.kernel.org/r/20240325193025.1540737-1-justin.chen@broadcom.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Author: Paolo Abeni

drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c

@@ -392,7 +392,9 @@ static void umac_reset(struct bcmasp_intf *intf)
 	umac_wl(intf, 0x0, UMC_CMD);
 	umac_wl(intf, UMC_CMD_SW_RESET, UMC_CMD);
 	usleep_range(10, 100);
-	umac_wl(intf, 0x0, UMC_CMD);
+	/* We hold the umac in reset and bring it out of
+	 * reset when phy link is up.
+	 */
 }
 
 static void umac_set_hw_addr(struct bcmasp_intf *intf,
@@ -412,6 +414,8 @@ static void umac_enable_set(struct bcmasp_intf *intf, u32 mask,
 	u32 reg;
 
 	reg = umac_rl(intf, UMC_CMD);
+	if (reg & UMC_CMD_SW_RESET)
+		return;
 	if (enable)
 		reg |= mask;
 	else
@@ -430,7 +434,6 @@ static void umac_init(struct bcmasp_intf *intf)
 	umac_wl(intf, 0x800, UMC_FRM_LEN);
 	umac_wl(intf, 0xffff, UMC_PAUSE_CNTRL);
 	umac_wl(intf, 0x800, UMC_RX_MAX_PKT_SZ);
-	umac_enable_set(intf, UMC_CMD_PROMISC, 1);
 }
 
 static int bcmasp_tx_poll(struct napi_struct *napi, int budget)
@@ -658,6 +661,12 @@ static void bcmasp_adj_link(struct net_device *dev)
 			UMC_CMD_HD_EN | UMC_CMD_RX_PAUSE_IGNORE |
 			UMC_CMD_TX_PAUSE_IGNORE);
 		reg |= cmd_bits;
+		if (reg & UMC_CMD_SW_RESET) {
+			reg &= ~UMC_CMD_SW_RESET;
+			umac_wl(intf, reg, UMC_CMD);
+			udelay(2);
+			reg |= UMC_CMD_TX_EN | UMC_CMD_RX_EN | UMC_CMD_PROMISC;
+		}
 		umac_wl(intf, reg, UMC_CMD);
 
 		active = phy_init_eee(phydev, 0) >= 0;
@@ -1035,19 +1044,12 @@ static int bcmasp_netif_init(struct net_device *dev, bool phy_connect)
 
 		/* Indicate that the MAC is responsible for PHY PM */
 		phydev->mac_managed_pm = true;
-	} else if (!intf->wolopts) {
-		ret = phy_resume(dev->phydev);
-		if (ret)
-			goto err_phy_disable;
 	}
 
 	umac_reset(intf);
 
 	umac_init(intf);
 
-	/* Disable the UniMAC RX/TX */
-	umac_enable_set(intf, (UMC_CMD_RX_EN | UMC_CMD_TX_EN), 0);
-
 	umac_set_hw_addr(intf, dev->dev_addr);
 
 	intf->old_duplex = -1;
@@ -1062,9 +1064,6 @@ static int bcmasp_netif_init(struct net_device *dev, bool phy_connect)
 	netif_napi_add(intf->ndev, &intf->rx_napi, bcmasp_rx_poll);
 	bcmasp_enable_rx(intf, 1);
 
-	/* Turn on UniMAC TX/RX */
-	umac_enable_set(intf, (UMC_CMD_RX_EN | UMC_CMD_TX_EN), 1);
-
 	intf->crc_fwd = !!(umac_rl(intf, UMC_CMD) & UMC_CMD_CRC_FWD);
 
 	bcmasp_netif_start(dev);
@@ -1306,7 +1305,14 @@ static void bcmasp_suspend_to_wol(struct bcmasp_intf *intf)
 	if (intf->wolopts & WAKE_FILTER)
 		bcmasp_netfilt_suspend(intf);
 
-	/* UniMAC receive needs to be turned on */
+	/* Bring UniMAC out of reset if needed and enable RX */
+	reg = umac_rl(intf, UMC_CMD);
+	if (reg & UMC_CMD_SW_RESET)
+		reg &= ~UMC_CMD_SW_RESET;
+
+	reg |= UMC_CMD_RX_EN | UMC_CMD_PROMISC;
+	umac_wl(intf, reg, UMC_CMD);
+
 	umac_enable_set(intf, UMC_CMD_RX_EN, 1);
 
 	if (intf->parent->wol_irq > 0) {
@@ -1324,7 +1330,6 @@ int bcmasp_interface_suspend(struct bcmasp_intf *intf)
 {
 	struct device *kdev = &intf->parent->pdev->dev;
 	struct net_device *dev = intf->ndev;
-	int ret = 0;
 
 	if (!netif_running(dev))
 		return 0;
@@ -1334,10 +1339,6 @@ int bcmasp_interface_suspend(struct bcmasp_intf *intf)
 	bcmasp_netif_deinit(dev);
 
 	if (!intf->wolopts) {
-		ret = phy_suspend(dev->phydev);
-		if (ret)
-			goto out;
-
 		if (intf->internal_phy)
 			bcmasp_ephy_enable_set(intf, false);
 		else
@@ -1354,11 +1355,7 @@ int bcmasp_interface_suspend(struct bcmasp_intf *intf)
 
 	clk_disable_unprepare(intf->parent->clk);
 
-	return ret;
-
-out:
-	bcmasp_netif_init(dev, false);
-	return ret;
+	return 0;
 }
 
 static void bcmasp_resume_from_wol(struct bcmasp_intf *intf)