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From b5375509184dc23d2b7fa0c5ed8763899ccc9674 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Sat, 2 Oct 2021 19:58:11 +0200
Subject: [PATCH] net: bgmac: improve handling PHY
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
1. Use info from DT if available
It allows describing for example a fixed link. It's more accurate than
just guessing there may be one (depending on a chipset).
2. Verify PHY ID before trying to connect PHY
PHY addr 0x1e (30) is special in Broadcom routers and means a switch
connected as MDIO devices instead of a real PHY. Don't try connecting to
it.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/ethernet/broadcom/bgmac-bcma.c | 33 ++++++++++++++--------
1 file changed, 21 insertions(+), 12 deletions(-)
--- a/drivers/net/ethernet/broadcom/bgmac-bcma.c
+++ b/drivers/net/ethernet/broadcom/bgmac-bcma.c
@@ -11,6 +11,7 @@
#include <linux/bcma/bcma.h>
#include <linux/brcmphy.h>
#include <linux/etherdevice.h>
+#include <linux/of_mdio.h>
#include <linux/of_net.h>
#include "bgmac.h"
@@ -86,17 +87,28 @@ static int bcma_phy_connect(struct bgmac
struct phy_device *phy_dev;
char bus_id[MII_BUS_ID_SIZE + 3];
+ /* DT info should be the most accurate */
+ phy_dev = of_phy_get_and_connect(bgmac->net_dev, bgmac->dev->of_node,
+ bgmac_adjust_link);
+ if (phy_dev)
+ return 0;
+
/* Connect to the PHY */
- snprintf(bus_id, sizeof(bus_id), PHY_ID_FMT, bgmac->mii_bus->id,
- bgmac->phyaddr);
- phy_dev = phy_connect(bgmac->net_dev, bus_id, bgmac_adjust_link,
- PHY_INTERFACE_MODE_MII);
- if (IS_ERR(phy_dev)) {
- dev_err(bgmac->dev, "PHY connection failed\n");
- return PTR_ERR(phy_dev);
+ if (bgmac->mii_bus && bgmac->phyaddr != BGMAC_PHY_NOREGS) {
+ snprintf(bus_id, sizeof(bus_id), PHY_ID_FMT, bgmac->mii_bus->id,
+ bgmac->phyaddr);
+ phy_dev = phy_connect(bgmac->net_dev, bus_id, bgmac_adjust_link,
+ PHY_INTERFACE_MODE_MII);
+ if (IS_ERR(phy_dev)) {
+ dev_err(bgmac->dev, "PHY connection failed\n");
+ return PTR_ERR(phy_dev);
+ }
+
+ return 0;
}
- return 0;
+ /* Assume a fixed link to the switch port */
+ return bgmac_phy_connect_direct(bgmac);
}
static const struct bcma_device_id bgmac_bcma_tbl[] = {
@@ -297,10 +309,7 @@ static int bgmac_probe(struct bcma_devic
bgmac->cco_ctl_maskset = bcma_bgmac_cco_ctl_maskset;
bgmac->get_bus_clock = bcma_bgmac_get_bus_clock;
bgmac->cmn_maskset32 = bcma_bgmac_cmn_maskset32;
- if (bgmac->mii_bus)
- bgmac->phy_connect = bcma_phy_connect;
- else
- bgmac->phy_connect = bgmac_phy_connect_direct;
+ bgmac->phy_connect = bcma_phy_connect;
err = bgmac_enet_probe(bgmac);
if (err)
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