netdev - [PATCH v7 03/11] net: pch_gbe: Probe PHY ID & initialize only once

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Date:   Tue, 26 Jun 2018 17:06:04 -0700
From:   Paul Burton <paul.burton@...s.com>
To:     netdev@...r.kernel.org
Cc:     "David S . Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>, paul.burton@...s.com
Subject: [PATCH v7 03/11] net: pch_gbe: Probe PHY ID & initialize only once

The pch_gbe driver currently probes for the PHY ID & configures the PHY
every time the MAC is reset, even though we know that the PHY won't have
changed since the last MAC reset [1].

This patch moves the PHY probe to instead happen only once when the
driver is probed, saving time & moving us closer to the behavior we'll
have with phylib.

[1] Please, someone patent PHY hotplugging & rigorously enforce said
    patent such that nobody can do it. At least not with an EG20T MAC.

Signed-off-by: Paul Burton <paul.burton@...s.com>
Cc: Andrew Lunn <andrew@...n.ch>
Cc: David S. Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org
---

Changes in v7: New patch

 .../ethernet/oki-semi/pch_gbe/pch_gbe_main.c  | 26 ++++++++++---------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
index 9651fa02d4bb..5157cea16773 100644
--- a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
+++ b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
@@ -617,8 +617,10 @@ static void pch_gbe_init_stats(struct pch_gbe_adapter *adapter)
 static int pch_gbe_init_phy(struct pch_gbe_adapter *adapter)
 {
 	struct net_device *netdev = adapter->netdev;
+	struct pch_gbe_hw *hw = &adapter->hw;
 	u32 addr;
 	u16 bmcr, stat;
+	s32 ret_val;
 
 	/* Discover phy addr by searching addrs in order {1,0,2,..., 31} */
 	for (addr = 0; addr < PCH_GBE_PHY_REGS_LEN; addr++) {
@@ -652,6 +654,16 @@ static int pch_gbe_init_phy(struct pch_gbe_adapter *adapter)
 	adapter->mii.mdio_read = pch_gbe_mdio_read;
 	adapter->mii.mdio_write = pch_gbe_mdio_write;
 	adapter->mii.supports_gmii = mii_check_gmii_support(&adapter->mii);
+
+	ret_val = pch_gbe_phy_get_id(hw);
+	if (ret_val) {
+		netdev_err(adapter->netdev, "pch_gbe_phy_get_id error\n");
+		return -EIO;
+	}
+	pch_gbe_phy_init_setting(hw);
+	/* Setup Mac interface option RGMII */
+	pch_gbe_phy_set_rgmii(hw);
+
 	return 0;
 }
 
@@ -721,22 +733,12 @@ void pch_gbe_reset(struct pch_gbe_adapter *adapter)
 {
 	struct net_device *netdev = adapter->netdev;
 	struct pch_gbe_hw *hw = &adapter->hw;
-	s32 ret_val;
 
 	pch_gbe_mac_reset_hw(hw);
 	/* reprogram multicast address register after reset */
 	pch_gbe_set_multi(netdev);
 	/* Setup the receive address. */
 	pch_gbe_mac_init_rx_addrs(hw, PCH_GBE_MAR_ENTRIES);
-
-	ret_val = pch_gbe_phy_get_id(hw);
-	if (ret_val) {
-		netdev_err(adapter->netdev, "pch_gbe_phy_get_id error\n");
-		return;
-	}
-	pch_gbe_phy_init_setting(hw);
-	/* Setup Mac interface option RGMII */
-	pch_gbe_phy_set_rgmii(hw);
 }
 
 /**
@@ -2577,6 +2579,8 @@ static int pch_gbe_probe(struct pci_dev *pdev,
 	if (ret)
 		goto err_free_netdev;
 
+	pch_gbe_check_options(adapter);
+
 	/* Initialize PHY */
 	ret = pch_gbe_init_phy(adapter);
 	if (ret) {
@@ -2606,8 +2610,6 @@ static int pch_gbe_probe(struct pci_dev *pdev,
 
 	INIT_WORK(&adapter->reset_task, pch_gbe_reset_task);
 
-	pch_gbe_check_options(adapter);
-
 	/* initialize the wol settings based on the eeprom settings */
 	adapter->wake_up_evt = PCH_GBE_WL_INIT_SETTING;
 	dev_info(&pdev->dev, "MAC address : %pM\n", netdev->dev_addr);
-- 
2.18.0