Relax the check for a PCI-express chipset by assuming the system is a

PCI-express chipset (and thus has functional MSI) if there are any
PCI-express devices in the system, not requiring a root port device.

With PCI-X the chipset detection has to be very conservative because there
are known systems with PCI-X devices that do not appear to have PCI-X
chipsets.  However, with PCI-express I'm not sure it is possible to have
a PCI-express device in a system with a non-PCI-express chipset.  If we
assume that is the case then this change is valid.  It is also required
for at least some PCI-express systems that don't have any devices with
a root port capability (some ICH9 systems).

MFC after:	1 week
Reported by:	jfv

1 files changed, 2 insertions, 5 deletions

diff --git a/sys/dev/pci/pci.c b/sys/dev/pci/pci.c
index d7343d2..0e8647f 100644
--- a/sys/dev/pci/pci.c
+++ b/sys/dev/pci/pci.c
@@ -616,12 +616,9 @@ pci_read_extcap(device_t pcib, pcicfgregs *cfg)
 		case PCIY_EXPRESS:	/* PCI-express */
 			/*
 			 * Assume we have a PCI-express chipset if we have
-			 * at least one PCI-express root port.
+			 * at least one PCI-express device.
 			 */
-			val = REG(ptr + PCIR_EXPRESS_FLAGS, 2);
-			if ((val & PCIM_EXP_FLAGS_TYPE) ==
-			    PCIM_EXP_TYPE_ROOT_PORT)
-				pcie_chipset = 1;
+			pcie_chipset = 1;
 			break;
 		default:
 			break;