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net: fec_mxc: Fix setting of RCR for xMII 

At least on i.MX25, the RMII mode did not work, which is fixed by this patch.

The MII_MODE bit of the FEC RCR register means xMII, i.e. 'not 7-wire', so set
it accordingly.

According to the xMII and 7-wire (aka GPSI) standards, full duplex should be
available on xMII, but not on 7-wire, so set FCE accordingly. The FEC may
support full duplex for 7-wire too, but the reference manual does not say that,
so avoid an invalid assumption. Actually, the choice between half and full
duplex also depends on the endpoint/switch/repeater configuration, so a config
option could be added for that, but there has been no need for it so far.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Cc: Joe Hershberger <joe.hershberger@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>
This commit is contained in:
benoit.thebaudeau@advans 2012-07-19 02:12:46 +00:00 committed by Joe Hershberger
parent 48a3e999c8
commit 9d2d924a0a
1 changed files with 3 additions and 5 deletions
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8
drivers/net/fec_mxc.c
View File

@ -424,14 +424,12 @@ static void fec_reg_setup(struct fec_priv *fec)
/* Start with frame length = 1518, common for all modes. */
rcntrl = PKTSIZE << FEC_RCNTRL_MAX_FL_SHIFT;
if (fec->xcv_type == SEVENWIRE)
rcntrl |= FEC_RCNTRL_FCE;
else if (fec->xcv_type == RGMII)
if (fec->xcv_type != SEVENWIRE) /* xMII modes */
rcntrl |= FEC_RCNTRL_FCE | FEC_RCNTRL_MII_MODE;
if (fec->xcv_type == RGMII)
rcntrl |= FEC_RCNTRL_RGMII;
else if (fec->xcv_type == RMII)
rcntrl |= FEC_RCNTRL_RMII;
else /* MII mode */
rcntrl |= FEC_RCNTRL_FCE | FEC_RCNTRL_MII_MODE;
writel(rcntrl, &fec->eth->r_cntrl);
}