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Add in a currently-disabled WAR for PCI NICs.

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Some earlier series (~AR5212?) play badly with BIOSes.

In these instances, they may require a forced reset (by transitioning
the NIC through D0 -> D3 -> D0) before they probe/attach correctly.

This is currently disabled because:

* I haven't figured out the "right" code to ensure this only happens
  for PCI NICs (not PCIe or Cardbus);
* I haven't at all done wide scale testing for this, and I'm not yet
  ready for said wide-scale testing.

I'm documenting this primarily so users with misbehaving NICs have
something to tinker with.

Obtained from:	Atheros
This commit is contained in:
Adrian Chadd 2011-10-18 03:32:18 +00:00
parent 65d1eb9443
commit 2c0dd4bbe4
1 changed files with 17 additions and 0 deletions
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17
sys/dev/ath/if_ath_pci.c
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@ -73,10 +73,27 @@ struct ath_pci_softc {
#define BS_BAR 0x10
#define PCIR_RETRY_TIMEOUT 0x41
#define PCIR_CFG_PMCSR 0x48
static void
ath_pci_setup(device_t dev)
{
/* Override the system latency timer */
pci_write_config(dev, PCIR_LATTIMER, 0x80, 1);
/* If a PCI NIC, force wakeup */
#ifdef ATH_PCI_WAKEUP_WAR
/* XXX TODO: don't do this for non-PCI (ie, PCIe, Cardbus!) */
if (1) {
uint16_t pmcsr;
pmcsr = pci_read_config(dev, PCIR_CFG_PMCSR, 2);
pmcsr |= 3;
pci_write_config(dev, PCIR_CFG_PMCSR, pmcsr, 2);
pmcsr &= ~3;
pci_write_config(dev, PCIR_CFG_PMCSR, pmcsr, 2);
}
#endif
/*
* Disable retry timeout to keep PCI Tx retries from
* interfering with C3 CPU state.