[U-Boot] [U-Boot, v2, 1/2] mx6cuboxi: Fix Ethernet PHY detection problem

[Vagrant Cascadian <vagrant@aikidev.net>]

On 2015-05-04, Fabio Estevam wrote:
> mx6cuboxi sometimes fails to recognize the Ethernet PHY:
>
> Net:   Phy 0 not found
>
> The explanation for this behavior comes from from Rabeeh Khoury:
>
> "The LED_ACT pin on the carrier-one boards had a pull down that
> forces the phy address to 0x0; where on CuBox-i and the production
> HummingBoard that pin is connected directly to LED that depending
> on the pull down strength of the LED it might be sampled as '0' or '1' thus
> the phy address might appear as either address 0x0 or 0x4."
>
> "This is AR8035 implementation; in reset stage the LED pin is configured as
> input, and pull up/down does matter. In this case it configures the PHY
> address.
>
> After reset is deasserted the same LED pin becomes output and then
> according to the previous pull/up it should be active high/low"
>
> One way to properly fix this behavior is to place external pull-up/down
> resistors in the LED line, but from a software standpoint we can fix it 
> by telling phy_find_by_mask() to scan the PHY at addresses
> 0x0 and 0x4.
>
> Reported-by: Vagrant Cascadian <vagrant@aikidev.net>
> Signed-off-by: Rabeeh Khoury <rabeeh@solid-run.com>
> Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
> ---
> Changes since v1:
> - Explain what the proper hardware fix would be as suggested by Nikolay
> - Remove error message from fec_probe as this function already prints on error.
>
>  board/solidrun/mx6cuboxi/mx6cuboxi.c | 29 ++++++++++++++++++++++++++++-
>  1 file changed, 28 insertions(+), 1 deletion(-)
>
> diff --git a/board/solidrun/mx6cuboxi/mx6cuboxi.c b/board/solidrun/mx6cuboxi/mx6cuboxi.c
> index 9aa0259..e83d2fe 100644
> --- a/board/solidrun/mx6cuboxi/mx6cuboxi.c
> +++ b/board/solidrun/mx6cuboxi/mx6cuboxi.c
> @@ -25,6 +25,7 @@
>  #include <asm/imx-common/video.h>
>  #include <mmc.h>
>  #include <fsl_esdhc.h>
> +#include <malloc.h>
>  #include <miiphy.h>
>  #include <netdev.h>
>  #include <asm/arch/crm_regs.h>
> @@ -152,9 +153,14 @@ int board_phy_config(struct phy_device *phydev)
>  	return 0;
>  }
>  
> +/* On Cuboxi Ethernet PHY can be located at addresses 0x0 or 0x4 */
> +#define ETH_PHY_MASK	((1 << 0x0) | (1 << 0x4))
> +
>  int board_eth_init(bd_t *bis)
>  {
>  	struct iomuxc *const iomuxc_regs = (struct iomuxc *)IOMUXC_BASE_ADDR;
> +	struct mii_dev *bus;
> +	struct phy_device *phydev;
>  
>  	int ret = enable_fec_anatop_clock(ENET_25MHZ);
>  	if (ret)
> @@ -165,7 +171,28 @@ int board_eth_init(bd_t *bis)
>  
>  	setup_iomux_enet();
>  
> -	return cpu_eth_init(bis);
> +	bus = fec_get_miibus(IMX_FEC_BASE, -1);
> +	if (!bus)
> +		return -EINVAL;
> +
> +	phydev = phy_find_by_mask(bus, ETH_PHY_MASK, PHY_INTERFACE_MODE_RGMII);
> +	if (!phydev) {
> +		ret = -EINVAL;
> +		goto free_bus;
> +	}
> +
> +	debug("using phy at address %d\n", phydev->addr);
> +	ret = fec_probe(bis, -1, IMX_FEC_BASE, bus, phydev);
> +	if (ret)
> +		goto free_phydev;
> +
> +	return 0;
> +
> +free_phydev:
> +	free(phydev);
> +free_bus:
> +	free(bus);
> +	return ret;
>  }
>  
>  #ifdef CONFIG_VIDEO_IPUV3
> -- 
> 1.9.1

Tested on cubox-i4pro and hummingboard-i2ex.

Tested-By: Vagrant Cascadian <vagrant@aikidev.net>
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