diff options
| author | wpaul <wpaul@FreeBSD.org> | 2000-10-27 00:15:04 +0000 |
|---|---|---|
| committer | wpaul <wpaul@FreeBSD.org> | 2000-10-27 00:15:04 +0000 |
| commit | f05284397ec89629b21217f6251a1d84737169f8 (patch) | |
| tree | 1a1c8df777d514e8fdb03e8c2e6477daf5e184f3 /sys | |
| parent | 489eb0f7772fb2e82e8b90a84cb542be305fd1e3 (diff) | |
| download | FreeBSD-src-f05284397ec89629b21217f6251a1d84737169f8.zip FreeBSD-src-f05284397ec89629b21217f6251a1d84737169f8.tar.gz | |
Yet another bug fix/optimization for the Davicom DM9100/9102: increase
the PCI latency timer value to 0x80. Davicom's Linux driver does this,
and it drastically reduces the number of TX underruns in my tests. (Note:
this is done only for the Davicom chips. I'm not sure it's a good idea to
do it for all of them.)
Again, still waiting on confirmation before merging to stable.
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/dev/dc/if_dc.c | 5 | ||||
| -rw-r--r-- | sys/pci/if_dc.c | 5 |
2 files changed, 10 insertions, 0 deletions
diff --git a/sys/dev/dc/if_dc.c b/sys/dev/dc/if_dc.c index a838709..ee83951 100644 --- a/sys/dev/dc/if_dc.c +++ b/sys/dev/dc/if_dc.c @@ -1836,6 +1836,11 @@ static int dc_attach(dev) sc->dc_flags |= DC_TX_COALESCE|DC_TX_INTR_ALWAYS; sc->dc_flags |= DC_REDUCED_MII_POLL|DC_TX_STORENFWD; sc->dc_pmode = DC_PMODE_MII; + /* Increase the latency timer value. */ + command = pci_read_config(dev, DC_PCI_CFLT, 4); + command &= 0xFFFF00FF; + command |= 0x00008000; + pci_write_config(dev, DC_PCI_CFLT, command, 4); break; case DC_DEVICEID_AL981: sc->dc_type = DC_TYPE_AL981; diff --git a/sys/pci/if_dc.c b/sys/pci/if_dc.c index a838709..ee83951 100644 --- a/sys/pci/if_dc.c +++ b/sys/pci/if_dc.c @@ -1836,6 +1836,11 @@ static int dc_attach(dev) sc->dc_flags |= DC_TX_COALESCE|DC_TX_INTR_ALWAYS; sc->dc_flags |= DC_REDUCED_MII_POLL|DC_TX_STORENFWD; sc->dc_pmode = DC_PMODE_MII; + /* Increase the latency timer value. */ + command = pci_read_config(dev, DC_PCI_CFLT, 4); + command &= 0xFFFF00FF; + command |= 0x00008000; + pci_write_config(dev, DC_PCI_CFLT, command, 4); break; case DC_DEVICEID_AL981: sc->dc_type = DC_TYPE_AL981; |
