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e1000e: Set HTHRESH when PTHRESH is used 

According to section 12.0.3.4.13 "Receive Descriptor Control - RXDCTL"
of the Intel® 82579 Gigabit Ethernet PHY Datasheet v2.1:

    "HTHRESH should be given a non zero value when ever PTHRESH is
     used."

In RXDCTL(0), PTHRESH lives at bits 5:0, and HTHREST lives at bits 13:8.
Set only bit 8 of HTHREST as is done in e1000_flush_rx_ring(). Found by
inspection.

Signed-off-by: Matt Turner <matt.turner@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Matt Turner 2017-11-07 14:13:30 -08:00 committed by Jeff Kirsher
parent 28cb2d1b0c
commit b701cacdbc
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/intel/e1000e/netdev.c
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@ -3303,7 +3303,7 @@ static void e1000_configure_rx(struct e1000_adapter *adapter)
if (adapter->flags & FLAG_IS_ICH) {
u32 rxdctl = er32(RXDCTL(0));
ew32(RXDCTL(0), rxdctl | 0x3);
ew32(RXDCTL(0), rxdctl | 0x3 | BIT(8));
}
pm_qos_update_request(&adapter->pm_qos_req, lat);