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this was in my queue since 2005/10/26 

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2252 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Stefan Reinauer 2006-04-11 19:23:57 +00:00
parent fbce0ffb92
commit cf648c9a99
1 changed files with 33 additions and 7 deletions
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40
src/devices/hypertransport.c
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@ -278,7 +278,20 @@ static void ht_collapse_early_enumeration(struct bus *bus, unsigned offset_uniti
}
/* Has the link failed? */
if (ctrl & (1 << 4)) {
return;
/*
* Either the link has failed, or we have
* a CRC error.
* Sometimes this can happen due to link
* retrain, so lets knock it down and see
* if its transient
*/
ctrl |= ((1 << 4) | (1 <<8)); // Link fail + Crc
pci_write_config16(prev.dev, prev.pos + prev.ctrl_off, ctrl);
ctrl = pci_read_config16(prev.dev, prev.pos + prev.ctrl_off);
if (ctrl & ((1 << 4) | (1 << 8))) {
printk_alert("Detected error on Hypertransport Link\n");
return;
}
}
} while((ctrl & (1 << 5)) == 0);
@ -382,12 +395,25 @@ unsigned int hypertransport_scan_chain(struct bus *bus,
/* Wait until the link initialization is complete */
do {
ctrl = pci_read_config16(prev.dev, prev.pos + prev.ctrl_off);
/* Is this the end of the hypertransport chain?
* Has the link failed?
* If so further scanning is pointless.
*/
if (ctrl & ((1 << 6) | (1 << 4))) {
goto end_of_chain;
if (ctrl & (1 << 6))
goto end_of_chain; // End of chain
if (ctrl & ((1 << 4) | (1 << 8))) {
/*
* Either the link has failed, or we have
* a CRC error.
* Sometimes this can happen due to link
* retrain, so lets knock it down and see
* if its transient
*/
ctrl |= ((1 << 4) | (1 <<8)); // Link fail + Crc
pci_write_config16(prev.dev, prev.pos + prev.ctrl_off, ctrl);
ctrl = pci_read_config16(prev.dev, prev.pos + prev.ctrl_off);
if (ctrl & ((1 << 4) | (1 << 8))) {
printk_alert("Detected error on Hypertransport Link\n");
goto end_of_chain;
}
}
} while((ctrl & (1 << 5)) == 0);