linux-kernel - Re: [PATCH] net: mv643xx_eth: Add missing phy_addr

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Date:	Tue, 05 Nov 2013 10:04:46 +0100
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
CC:	David Miller <davem@...emloft.net>,
	Lennert Buytenhek <buytenh@...tstofly.org>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: mv643xx_eth: Add missing phy_addr_set in DT mode

On 11/05/2013 01:27 AM, Jason Gunthorpe wrote:
> Commit cc9d4598 'net: mv643xx_eth: use of_phy_connect if phy_node
> present' made the call to phy_scan optional, if the DT has a link to
> the phy node.
>
> However phy_scan has the side effect of calling phy_addr_set, which
> writes the phy MDIO address to the ethernet controller. If phy_addr_set
> is not called, and the bootloader has not set the correct address then
> the driver will fail to function.
>
> Tested on Kirkwood.
>
> Signed-off-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
> ---

Jason,

thanks for catching this! I do my kirkwood testing on Dockstar,
which has PHY addr 0x0 - also the reset default, which may be
why it slipped through.

Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>

> ---
>   drivers/net/ethernet/marvell/mv643xx_eth.c | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/drivers/net/ethernet/marvell/mv643xx_eth.c b/drivers/net/ethernet/marvell/mv643xx_eth.c
> index 2c210ec..00e43b5 100644
> --- a/drivers/net/ethernet/marvell/mv643xx_eth.c
> +++ b/drivers/net/ethernet/marvell/mv643xx_eth.c
> @@ -2890,6 +2890,7 @@ static int mv643xx_eth_probe(struct platform_device *pdev)
>   					 PHY_INTERFACE_MODE_GMII);
>   		if (!mp->phy)
>   			err = -ENODEV;
> +		phy_addr_set(mp, mp->phy->addr);
>   	} else if (pd->phy_addr != MV643XX_ETH_PHY_NONE) {
>   		mp->phy = phy_scan(mp, pd->phy_addr);
>
>

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