netdev - Re: [PATCH] net: macb: Fix regression breaking non-MDIO fixed-link PHYs

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Date:   Wed, 15 Aug 2018 14:59:55 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, a.fatoum@...gutronix.de,
        "David S. Miller" <davem@...emloft.net>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        netdev <netdev@...r.kernel.org>, mdf@...nel.org,
        stable@...r.kernel.org, Sascha Hauer <kernel@...gutronix.de>,
        brad.mouring@...com, Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH] net: macb: Fix regression breaking non-MDIO fixed-link PHYs

Hi,

On Wed, Aug 15, 2018 at 3:35 AM Andrew Lunn <andrew@...n.ch> wrote:
>
> On Tue, Aug 14, 2018 at 05:58:12PM +0200, Uwe Kleine-König wrote:
> > Hello Ahmad,
> >
> >
> > On Tue, Aug 14, 2018 at 04:12:40PM +0200, Ahmad Fatoum wrote:
> > > The referenced commit broke initializing macb on the EVB-KSZ9477 eval board.
> > > There, of_mdiobus_register was called even for the fixed-link representing
> > > the SPI-connected switch PHY, with the result that the driver attempts to
> > > enumerate PHYs on a non-existent MDIO bus:
> > >
I ran into a similar problem on v14.4 for davinci_mdio I had to patch
it with [1].
The cpsw has 2 phys one phy is connected to KSZ9031 and other to
ksz9897 Ethernet switch
which is treated as a fixed phy with no mdio lines because of which
mdio_read/write failed.
This didn’t happen in v4.9.x something in core has changed ?

[1]

diff --git a/drivers/net/ethernet/ti/davinci_mdio.c
b/drivers/net/ethernet/ti/davinci_mdio.c
index 3e84107..197baa6 100644
--- a/drivers/net/ethernet/ti/davinci_mdio.c
+++ b/drivers/net/ethernet/ti/davinci_mdio.c
@@ -245,6 +245,13 @@ static int davinci_mdio_read(struct mii_bus *bus,
int phy_id, int phy_reg)
        u32 reg;
        int ret;

+       if (phy_id == 2)
+               return 0;
+
        if (phy_reg & ~PHY_REG_MASK || phy_id & ~PHY_ID_MASK)
                return -EINVAL;

@@ -289,6 +296,13 @@ static int davinci_mdio_write(struct mii_bus
*bus, int phy_id,
        u32 reg;
        int ret;

+       if (phy_id == 2)
+               return 0;
+
        if (phy_reg & ~PHY_REG_MASK || phy_id & ~PHY_ID_MASK)
                return -EINVAL;


Cheers,
--Prabhakar Lad