netdev - Re: [PATCH] bcm63xx_enet: fix internal phy IRQ assignment

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Date:   Thu, 25 Feb 2021 14:48:25 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Daniel González Cabanelas <dgcbueu@...il.com>
Cc:     davem@...emloft.net, kuba@...nel.org, f.fainelli@...il.com,
        gregkh@...uxfoundation.org, netdev@...r.kernel.org,
        noltari@...il.com
Subject: Re: [PATCH] bcm63xx_enet: fix internal phy IRQ assignment

On Wed, Feb 24, 2021 at 03:56:08PM +0100, Daniel González Cabanelas wrote:
> The current bcm63xx_enet driver doesn't asign the internal phy IRQ. As a
> result of this it works in polling mode.
> 
> Fix it using the phy_device structure to assign the platform IRQ.
> 
> Tested under a BCM6348 board. Kernel dmesg before the patch:
>    Broadcom BCM63XX (1) bcm63xx_enet-0:01: attached PHY driver [Broadcom
>               BCM63XX (1)] (mii_bus:phy_addr=bcm63xx_enet-0:01, irq=POLL)
> 
> After the patch:
>    Broadcom BCM63XX (1) bcm63xx_enet-0:01: attached PHY driver [Broadcom
>               BCM63XX (1)] (mii_bus:phy_addr=bcm63xx_enet-0:01, irq=17)
> 
> Pluging and uplugging the ethernet cable now generates interrupts and the
> PHY goes up and down as expected.
> 
> Signed-off-by: Daniel González Cabanelas <dgcbueu@...il.com>
> ---
>  drivers/net/ethernet/broadcom/bcm63xx_enet.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/net/ethernet/broadcom/bcm63xx_enet.c b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
> index fd876721316..0dad527abb9 100644
> --- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
> +++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
> @@ -1819,7 +1819,14 @@ static int bcm_enet_probe(struct platform_device *pdev)
>  		bus->phy_mask = ~(1 << priv->phy_id);
>  
>  		if (priv->has_phy_interrupt)
> +			phydev = mdiobus_get_phy(bus, priv->phy_id);
> +			if (!phydev) {
> +				dev_err(&dev->dev, "no PHY found\n");
> +				goto out_unregister_mdio;
> +			}
> +
>  			bus->irq[priv->phy_id] = priv->phy_interrupt;
> +			phydev->irq = priv->phy_interrupt;

Hi Daniel

You should not need both bus->irq[priv->phy_id] and phydev->irq. When
then MDIO bus is registered and then probed, and the PHY found,
phydev->irq is set to bus->irq[priv->phy_id]. Assuming this did
actually work once, has there been a change in the order during probe?
You might just need to place the existing assignment earlier.

    Andrew