On Fri, Jul 17, 2009 at 6:27 AM, Wolfgang Denk<w...@denx.de> wrote: > The MII speed calculation was based on the CPU clock (ppc_proc_freq), > but for MPC512x we must use the bus clock instead. > > This patch makes it use the correct clock and makes sure we don't > clobber reserved bits in the MII_SPEED register. > > Signed-off-by: Wolfgang Denk <w...@denx.de> > Cc: Grant Likely <grant.lik...@secretlab.ca> > Cc: Kumar Gala <ga...@kernel.crashing.org> > Cc: <net...@vger.kernel.org>
Acked-by: Grant Likely <grant.lik...@secretlab.ca> David, this isn't a critical bug fix or a regression, so I think it should be merged for -next. g. > --- > v5: - fix divider so we really use 2.5 MHz (instead of 1.25) > - use maximum divider in case MPC512x IPS clock is unknown > > drivers/net/fs_enet/mii-fec.c | 37 +++++++++++++++++++++++++++++++++---- > 1 files changed, 33 insertions(+), 4 deletions(-) > > diff --git a/drivers/net/fs_enet/mii-fec.c b/drivers/net/fs_enet/mii-fec.c > index 75a0999..5176986 100644 > --- a/drivers/net/fs_enet/mii-fec.c > +++ b/drivers/net/fs_enet/mii-fec.c > @@ -36,6 +36,7 @@ > #include <asm/pgtable.h> > #include <asm/irq.h> > #include <asm/uaccess.h> > +#include <asm/mpc5xxx.h> > > #include "fs_enet.h" > #include "fec.h" > @@ -103,11 +104,11 @@ static int fs_enet_fec_mii_reset(struct mii_bus *bus) > static int __devinit fs_enet_mdio_probe(struct of_device *ofdev, > const struct of_device_id *match) > { > - struct device_node *np = NULL; > struct resource res; > struct mii_bus *new_bus; > struct fec_info *fec; > - int ret = -ENOMEM, i; > + int (*get_bus_freq)(struct device_node *) = match->data; > + int ret = -ENOMEM, clock, speed; > > new_bus = mdiobus_alloc(); > if (!new_bus) > @@ -133,13 +134,35 @@ static int __devinit fs_enet_mdio_probe(struct > of_device *ofdev, > if (!fec->fecp) > goto out_fec; > > - fec->mii_speed = ((ppc_proc_freq + 4999999) / 5000000) << 1; > + if (get_bus_freq) { > + clock = get_bus_freq(ofdev->node); > + if (!clock) { > + /* Use maximum divider if clock is unknown */ > + dev_warn(&ofdev->dev, "could not determine IPS > clock\n"); > + clock = 0x3F * 5000000; > + } > + } else > + clock = ppc_proc_freq; > + > + /* > + * Scale for a MII clock <= 2.5 MHz > + * Note that only 6 bits (25:30) are available for MII speed. > + */ > + speed = (clock + 4999999) / 5000000; > + if (speed > 0x3F) { > + speed = 0x3F; > + dev_err(&ofdev->dev, > + "MII clock (%d Hz) exceeds max (2.5 MHz)\n", > + clock / speed); > + } > + > + fec->mii_speed = speed << 1; > > setbits32(&fec->fecp->fec_r_cntrl, FEC_RCNTRL_MII_MODE); > setbits32(&fec->fecp->fec_ecntrl, FEC_ECNTRL_PINMUX | > FEC_ECNTRL_ETHER_EN); > out_be32(&fec->fecp->fec_ievent, FEC_ENET_MII); > - out_be32(&fec->fecp->fec_mii_speed, fec->mii_speed); > + clrsetbits_be32(&fec->fecp->fec_mii_speed, 0x7E, fec->mii_speed); > > new_bus->phy_mask = ~0; > new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL); > @@ -188,6 +211,12 @@ static struct of_device_id fs_enet_mdio_fec_match[] = { > { > .compatible = "fsl,pq1-fec-mdio", > }, > +#if defined(CONFIG_PPC_MPC512x) > + { > + .compatible = "fsl,mpc5121-fec-mdio", > + .data = mpc5xxx_get_bus_frequency, > + }, > +#endif > {}, > }; > > -- > 1.6.0.6 > > -- Grant Likely, B.Sc., P.Eng. Secret Lab Technologies Ltd. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev