AGPSTAT
pci_read_config_dword(td, bridge->capndx+AGPSTAT, &tstatus);
pci_read_config_dword(bridge->dev, bridge->capndx+AGPSTAT, &tstatus);
pci_read_config_dword(td, bridge->capndx+AGPSTAT, &tstatus);
pci_read_config_dword(dev, cur->capndx+AGPSTAT, &mstatus);