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Subject[PATCH v2 1/3] net: macb: fix for fixed-link mode
Date
This patch fix the issue with fixed link. With fixed-link
device opening fails due to macb_phylink_connect not
handling fixed-link mode, in which case no MAC-PHY connection
is needed and phylink_connect return success (0), however
in current driver attempt is made to search and connect to
PHY even for fixed-link.

Signed-off-by: Milind Parab <mparab@cadence.com>
---
drivers/net/ethernet/cadence/macb_main.c | 25 +++++++++++++++---------
1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 9c767ee252ac..8c1812f39927 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -611,21 +611,25 @@ static const struct phylink_mac_ops macb_phylink_ops = {
.mac_link_up = macb_mac_link_up,
};

+static bool macb_phy_handle_exists(struct device_node *dn)
+{
+ dn = of_parse_phandle(dn, "phy-handle", 0);
+ of_node_put(dn);
+ return dn != NULL;
+}
+
+
static int macb_phylink_connect(struct macb *bp)
{
struct net_device *dev = bp->dev;
struct phy_device *phydev;
+ struct device_node *dn = bp->pdev->dev.of_node;
int ret;

- if (bp->pdev->dev.of_node &&
- of_parse_phandle(bp->pdev->dev.of_node, "phy-handle", 0)) {
- ret = phylink_of_phy_connect(bp->phylink, bp->pdev->dev.of_node,
- 0);
- if (ret) {
- netdev_err(dev, "Could not attach PHY (%d)\n", ret);
- return ret;
- }
- } else {
+ if (dn)
+ ret = phylink_of_phy_connect(bp->phylink, dn, 0);
+
+ if (!dn || (ret && !macb_phy_handle_exists(dn))) {
phydev = phy_find_first(bp->mii_bus);
if (!phydev) {
netdev_err(dev, "no PHY found\n");
@@ -638,6 +642,9 @@ static int macb_phylink_connect(struct macb *bp)
netdev_err(dev, "Could not attach to PHY (%d)\n", ret);
return ret;
}
+ } else if (ret) {
+ netdev_err(dev, "Could not attach PHY (%d)\n", ret);
+ return ret;
}

phylink_start(bp->phylink);
--
2.17.1
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