pci: scan only type 0 and type 1
In certain cases when a PCI device is passthru and is frozen before it
reaches SLOF. All PCI read result reading FF. This exposed a bug in
the pci scan code which would wrongly take it as a pci brigde and try
to scan devices below that and that would enter an infinite loop.
Explicitly scan for type 0/1 and rest are not supported.
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
diff --git a/slof/fs/pci-scan.fs b/slof/fs/pci-scan.fs
index 7e860f4..8ab8cad 100644
--- a/slof/fs/pci-scan.fs
+++ b/slof/fs/pci-scan.fs
@@ -231,11 +231,12 @@
dup set-space \ set the config addr for this device tree entry
dup pci-set-slot \ set the slot bit
dup pci-htype@ \ read HEADER-Type
- 1 and IF \ IF BRIDGE
- pci-bridge-setup \ | set up the bridge
- ELSE \ ELSE
- pci-device-setup \ | set up the device
- THEN \ FI
+ 7f and \ Mask bit 7 - multifunction device
+ CASE
+ 0 OF pci-device-setup ENDOF \ | set up the device
+ 1 OF pci-bridge-setup ENDOF \ | set up the bridge
+ dup OF dup pci-htype@ pci-out ENDOF
+ ENDCASE
finish-device \ and close the device-tree node
;
