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SubjectRe: [PATCH net] net: macb: fix for fixed-link mode
Date


On 10.01.2020 07:46, Milind Parab wrote:
> 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.
>
> Fixes: 7897b071ac3b ("net: macb: convert to phylink")
> Signed-off-by: Milind Parab <mparab@cadence.com>
> ---
> drivers/net/ethernet/cadence/macb_main.c | 24 +++++++++++++++---------
> 1 file changed, 15 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
> index c5ee363ca5dc..41c485485619 100644
> --- a/drivers/net/ethernet/cadence/macb_main.c
> +++ b/drivers/net/ethernet/cadence/macb_main.c
> @@ -611,21 +611,24 @@ 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 +641,9 @@ 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;
> }

You can remove this "else if (ret)" branch and also:
if (ret) {
netdev_err(dev, "Could not attach PHY (%d)\n", ret);
return ret;
}

under "if (!dn || (ret && !macb_phy_handle_exists(dn)))" and have something
like:

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 (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");
return -ENXIO;
}

/* attach the mac to the phy */
ret = phylink_connect_phy(bp->phylink, phydev);
}

if (ret) {
netdev_err(dev, "Could not attach PHY (%d)\n", ret);
return ret;
}

phylink_start(bp->phylink);

return 0;
}

>
> phylink_start(bp->phylink);
> --
> 2.17.1
>
>
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