netdev - [PATCH 2/2] net: bgmac: enable master mode for BCM54210E and B50212E PHYs

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Message-Id: <20171012082126.30660-3-zajec5@gmail.com>
Date:   Thu, 12 Oct 2017 10:21:26 +0200
From:   Rafał Miłecki <zajec5@...il.com>
To:     "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Jon Mason <jon.mason@...adcom.com>,
        Steve Lin <steven.lin1@...adcom.com>,
        Tobias Klauser <tklauser@...tanz.ch>,
        bcm-kernel-feedback-list@...adcom.com,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: [PATCH 2/2] net: bgmac: enable master mode for BCM54210E and B50212E PHYs

From: Rafał Miłecki <rafal@...ecki.pl>

There are 4 very similar PHYs:
0x600d84a1: BCM54210E (rev B0)
0x600d84a2: BCM54210E (rev B1)
0x600d84a5: B50212E (rev B0)
0x600d84a6: B50212E (rev B1)
that need setting master mode manually. It's because they run in slave
mode by default with Automatic Slave/Master configuration disabled which
can lead to unreliable connection with massive ping loss.

So far it was reported for a board with BCM47189 SoC and B50212E B1 PHY
connected to the bgmac supported ethernet device. Telling PHY driver to
setup PHY properly solves this issue.

Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
---
 drivers/net/ethernet/broadcom/bgmac-bcma.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/bgmac-bcma.c b/drivers/net/ethernet/broadcom/bgmac-bcma.c
index 6322594ab260..6fe074c1588b 100644
--- a/drivers/net/ethernet/broadcom/bgmac-bcma.c
+++ b/drivers/net/ethernet/broadcom/bgmac-bcma.c
@@ -184,13 +184,19 @@ static int bgmac_probe(struct bcma_device *core)
 
 	if (!bgmac_is_bcm4707_family(core) &&
 	    !(ci->id == BCMA_CHIP_ID_BCM53573 && core->core_unit == 1)) {
+		struct phy_device *phydev;
+
 		mii_bus = bcma_mdio_mii_register(bgmac);
 		if (IS_ERR(mii_bus)) {
 			err = PTR_ERR(mii_bus);
 			goto err;
 		}
-
 		bgmac->mii_bus = mii_bus;
+
+		phydev = mdiobus_get_phy(bgmac->mii_bus, bgmac->phyaddr);
+		if (ci->id == BCMA_CHIP_ID_BCM53573 && phydev &&
+		    (phydev->drv->phy_id & phydev->drv->phy_id_mask) == PHY_ID_BCM54210E)
+			phydev->dev_flags |= PHY_BRCM_EN_MASTER_MODE;
 	}
 
 	if (core->bus->hosttype == BCMA_HOSTTYPE_PCI) {
-- 
2.11.0