diff options
Diffstat (limited to 'src/southbridge/via/k8t890')
| -rw-r--r-- | src/southbridge/via/k8t890/k8t890_pcie.c | 37 |
1 files changed, 35 insertions, 2 deletions
diff --git a/src/southbridge/via/k8t890/k8t890_pcie.c b/src/southbridge/via/k8t890/k8t890_pcie.c index 804398cf88..89fbc9a989 100644 --- a/src/southbridge/via/k8t890/k8t890_pcie.c +++ b/src/southbridge/via/k8t890/k8t890_pcie.c @@ -35,7 +35,23 @@ static void peg_init(struct device *dev) reg = pci_read_config8(dev, 0x50); pci_write_config8(dev, 0x50, reg | 0x10); - /* Award has 0xb, VIA recomends 0x4. */ + /* Disable downstream read cycle retry, + * otherwise the bus scan will hang if no device is plugged in. */ + reg = pci_read_config8(dev, 0xa3); + pci_write_config8(dev, 0xa3, reg & ~0x01); + + /* Use PHY negotiation for lane config */ + reg = pci_read_config8(dev, 0xc1); + pci_write_config8(dev, 0xc1, reg & ~0x1f); + + /* Award has 0xb, VIA recommends 0xd, default 0x8. + * bit4: receive polarity change control + * bits3:2: squelch window select 64~175mv + * bit1: Number of non-idle bits detected before exiting idle state + * 0: 10 bits, 1: 2 bits + * bit0: Number of idle bits detected before entering idle state + * 0: 10 bits, 1: 2 bits + */ pci_write_config8(dev, 0xe1, 0xb); /* @@ -75,8 +91,25 @@ static void pcie_init(struct device *dev) reg = pci_read_config8(dev, 0x50); pci_write_config8(dev, 0x50, reg | 0x10); - /* Award has 0xb, VIA recommends 0x4. */ + /* Disable downstream read cycle retry, + * otherwise the bus scan will hang if no device is plugged in. */ + reg = pci_read_config8(dev, 0xa3); + pci_write_config8(dev, 0xa3, reg & ~0x01); + + /* Use PHY negotiation for lane config */ + reg = pci_read_config8(dev, 0xc1); + pci_write_config8(dev, 0xc1, reg & ~0x1f); + + /* Award has 0xb, VIA recommends 0xd, default 0x8. + * bit4: receive polarity change control + * bits3:2: squelch window select 64~175mv + * bit1: Number of non-idle bits detected before exiting idle state + * 0: 10 bits, 1: 2 bits + * bit0: Number of idle bits detected before entering idle state + * 0: 10 bits, 1: 2 bits + */ pci_write_config8(dev, 0xe1, 0xb); + /* Set replay timer limit. */ pci_write_config8(dev, 0xb1, 0xf0); |