[U-Boot] [PATCH v3 01/22] net: FEC: Add compatible for vybrid (vf610) to reuse fec_mxc.c driver

[Lukasz Majewski]

Hi Marcel,

> Hi Lukasz
> 
> On Sun, 2019-02-03 at 00:02 +0100, Lukasz Majewski wrote:
> > The NXP's FEC driver can be reused on vf610 device (with DM).
> > 
> > Signed-off-by: Lukasz Majewski <lukma at denx.de>
> > Reviewed-by: Stefan Agner <stefan.agner at toradex.com>
> > ---
> > 
> > Changes in v3: None
> > Changes in v2: None
> > 
> >  drivers/net/fec_mxc.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c
> > index 1a59026a62..5ff49224f4 100644
> > --- a/drivers/net/fec_mxc.c
> > +++ b/drivers/net/fec_mxc.c
> > @@ -1486,6 +1486,7 @@ static const struct udevice_id fecmxc_ids[] =
> > { { .compatible = "fsl,imx6ul-fec" },
> >  	{ .compatible = "fsl,imx53-fec" },
> >  	{ .compatible = "fsl,imx7d-fec" },
> > +	{ .compatible = "fsl,mvf600-fec" },
> >  	{ }
> >  };  
> 
> For some reason while the FEC prior to DM was rock solid on Vybrid
> with DM it at times only sends stuff but refuses to receive packets.
> Do you recall having any such issues? Could it have to do with us
> using FEC1 by default rather than FEC0? But then at times it works
> just fine again which is rather strange...

I had also some problems when I switched to DM (but for other NXP
IMX6Q based board - mccmon6). It turned out that the time between probe
in the driver and first read of MDIO was just as in spec (or too short).

As a result the PHY was sometimes in uninitialized state, and silently
read 0xFFFFFFFF as ID, which prevent us from normal work.

The fix in this case was to increase the delay between powering up PHY
and exiting the ETH driver probe:
http://patchwork.ozlabs.org/patch/1034050/


Please check if this patch (from this series):
"pcm052: bk4: Add board_phy_config() for BK4 to setup ksz8081 phy"

is not solving your problem.

> 
> Cheers
> 
> Marcel




Best regards,

Lukasz Majewski

--

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