netdev - am3359 (cpsw): unable to get gigabit link working (PHY: ICPlus IP1001)

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Date:	Wed, 13 Jun 2012 14:28:41 +0200
From:	Yegor Yefremov <yegorslists@...glemail.com>
To:	netdev <netdev@...r.kernel.org>
Cc:	cyril@...com, srk@...com, mugunthanvnm@...com
Subject: am3359 (cpsw): unable to get gigabit link working (PHY: ICPlus IP1001)

I'm using a custom am3359 based board. The first CPSW ports is
connected to ICPlus IP1001 phy via RGMII interface. I have no problem
with 100mbit link, but as soon as I connect my board to a 1Gbit switch
the communication fails. I can see that some data goes on wire, but
switch refuses to forward it. I can't receive anything either. Phy
detects 1Gbit link correctly.

My kernel: https://github.com/koenkooi/linux

I also define phy interface as RGMII:

static struct cpsw_slave_data am33xx_cpsw_slaves[] = {
        {
                .slave_reg_ofs  = 0x208,
                .sliver_reg_ofs = 0xd80,
                .phy_id         = "0:02",
                .phy_if               = PHY_INTERFACE_MODE_RGMII,
        },
        {
                .slave_reg_ofs  = 0x308,
                .sliver_reg_ofs = 0xdc0,
                .phy_id         = "0:01",
        },
};

As far as I can see in the mainline cpsw driver
PHY_INTERFACE_MODE_RGMII will be ignored. Why? In the current driver
it sets two bits in mac_control register:

if (phy->interface == PHY_INTERFACE_MODE_RGMII) /* RGMII */
                        mac_control |= (BIT(15)|BIT(16));

Any idea where should I look to solve the problem?
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