[PATCH] net: fsl_enetc: fix imdio register calculation

[Wei Fang]

> > > With commit cc4e8af2c552, fsl_enetc register accessors have been
> > > split to
> >
> > With 'commit cc4e8af2c552 ("net: fsl_enetc: Split register accessors")'
> >
> > > handle different register offsets on different SoCs. However, for
> > > internal MDIO register calculation, only ENETC_PM_IMDIO_BASE was
> > > fixed without adding the SoC specific MAC register offset.
> > >
> > > As a result, the network support for the Kontron SMARC-sAL28 and
> > > probably other boards based on the LS1028A CPU is broken.
> > >
> > > Add the SoC specific MAC register offset to calculation of
> > > imdio.priv to fix this.
> > >
> > > Fixes: cc4e8af2c552 ("net: fsl_enetc: Split register accessors")
> > > Signed-off-by: Thomas Schaefer <thomas.schaefer at kontron.com>
> > > Signed-off-by: Heiko Thiery <heiko.thiery at gmail.com>
> >
> > With the nitpick above:
> >
> > Reviewed-by: Michael Walle <mwalle at kernel.org>
> >
> > > ---
> > >
> > > But the question that now arises is, does this code path work on the
> > > imx SoCs as well. Now the imx specific offset 0x5000 is added here
> > > and was not used before.
> >
> > Maybe the imx9 doesn't use the internal MDIO controller or the board
> > which was this tested on doesn't use the PCS?
> >
> > -michael
> 
> The imx specific offset 0x5000 should be correct.
> 
> In downstream, the ENETC_PM_IMDIO_BASE macro is used in common code, but
> defined twice - there is a conditional include of either fsl_enetc.h, or fsl_enetc4.h,
> depending on whether CONFIG_ARCH_IMX9 is defined. Thus,
> ENETC_PM_IMDIO_BASE is replaced either with 0x8030 or 0x5030 in
> downstream.
> https://github.com/nxp-qoriq/u-boot/blob/lf-6.12.3-1.0.0/drivers/net/fsl_enetc.
> c#L25
> https://github.com/nxp-qoriq/u-boot/blob/lf-6.12.3-1.0.0/drivers/net/fsl_enetc.
> h#L76
> https://github.com/nxp-qoriq/u-boot/blob/lf-6.12.3-1.0.0/drivers/net/fsl_enetc
> 4.h#L126
> 
> I guess Marek fell into the pitfall when upstreaming.
> 
> > > Can someone please test this on an imx9 and confirm?
> > >
> > >  drivers/net/fsl_enetc.c | 4 +++-
> > >  1 file changed, 3 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/net/fsl_enetc.c b/drivers/net/fsl_enetc.c index
> > > 52fa820f51..97cccda451 100644
> > > --- a/drivers/net/fsl_enetc.c
> > > +++ b/drivers/net/fsl_enetc.c
> > > @@ -473,13 +473,15 @@ static int enetc_init_sxgmii(struct udevice
> > > *dev)
> > >  /* Apply protocol specific configuration to MAC, serdes as needed
> > > */  static void enetc_start_pcs(struct udevice *dev)  {
> > > +	struct enetc_data *data = (struct enetc_data
> > > +*)dev_get_driver_data(dev);
> > >  	struct enetc_priv *priv = dev_get_priv(dev);
> > >
> > >  	/* register internal MDIO for debug purposes */
> > >  	if (enetc_read_pcapr_mdio(dev)) {
> > >  		priv->imdio.read = enetc_mdio_read;
> > >  		priv->imdio.write = enetc_mdio_write;
> > > -		priv->imdio.priv = priv->port_regs + ENETC_PM_IMDIO_BASE;
> > > +		priv->imdio.priv = priv->port_regs + data->reg_offset_mac +
> > > +		                   ENETC_PM_IMDIO_BASE;
> > >  		strlcpy(priv->imdio.name, dev->name, MDIO_NAME_LEN);
> > >  		if (!miiphy_get_dev_by_name(priv->imdio.name))
> > >  			mdio_register(&priv->imdio);
> >
> 
> Reviewed-by: Vladimir Oltean <vladimir.oltean at nxp.com>
> Tested-by: Vladimir Oltean <vladimir.oltean at nxp.com> # LS1028A
> 
> +Fang Wei to confirm/test for i.MX95.

Hi Alice,

Can you help check this patch on i.MX95?