From: Of Jeff Kirsher > Sent: 26 June 2015 11:21 > In SPT/i219, there were CRC errors in speed 10/100 full duplex. > The solution given by the HW team is to increase the IPG from 8 to 0xC > > Signed-off-by: Yanir Lubetkin <yanirx.lubet...@intel.com> > Tested-by: Aaron Brown <aaron.f.br...@intel.com> > Signed-off-by: Jeff Kirsher <jeffrey.t.kirs...@intel.com> > --- > drivers/net/ethernet/intel/e1000e/ich8lan.c | 10 +++++++--- > 1 file changed, 7 insertions(+), 3 deletions(-) > > diff --git a/drivers/net/ethernet/intel/e1000e/ich8lan.c > b/drivers/net/ethernet/intel/e1000e/ich8lan.c > index c5bb1dd..983f5bf 100644 > --- a/drivers/net/ethernet/intel/e1000e/ich8lan.c > +++ b/drivers/net/ethernet/intel/e1000e/ich8lan.c > @@ -1400,16 +1400,20 @@ static s32 e1000_check_for_copper_link_ich8lan(struct > e1000_hw *hw) > if (((hw->mac.type == e1000_pch2lan) || > (hw->mac.type == e1000_pch_lpt) || > (hw->mac.type == e1000_pch_spt)) && link) { > - u32 reg; > + u16 speed, duplex; > > - reg = er32(STATUS); > + e1000e_get_speed_and_duplex_copper(hw, &speed, &duplex); > tipg_reg = er32(TIPG); > tipg_reg &= ~E1000_TIPG_IPGT_MASK; > > - if (!(reg & (E1000_STATUS_FD | E1000_STATUS_SPEED_MASK))) { > + if (duplex == HALF_DUPLEX && speed == SPEED_10) { > tipg_reg |= 0xFF; > /* Reduce Rx latency in analog PHY */ > emi_val = 0; > + } else if (hw->mac.type == e1000_pch_spt && > + duplex == FULL_DUPLEX && speed != SPEED_1000) {
You really ought to have a comment here explaining why the inter-packet gap is increased. > + tipg_reg |= 0xC; Shouldn't you mask out the old IPG value - just in case it isn't 8. > + emi_val = 1; > } else { > > /* Roll back the default values */ David -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html