powerpc/pseries: Perform proper max_bus_speed detection
On pseries machines the detection for max_bus_speed should be done
through an OpenFirmware property. This patch adds a function to perform
this detection and a hook to perform dynamic adding of the function only
for pseries. This is done by overwriting the weak
pcibios_root_bridge_prepare function which is called by
pci_create_root_bus().
From: Lucas Kannebley Tavares <lucaskt@linux.vnet.ibm.com>
Signed-off-by: Kleber Sacilotto de Souza <klebers@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index f325dc9..d5811d8 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -845,6 +845,14 @@
return 1;
}
+int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
+{
+ if (ppc_md.pcibios_root_bridge_prepare)
+ return ppc_md.pcibios_root_bridge_prepare(bridge);
+
+ return 0;
+}
+
/* This header fixup will do the resource fixup for all devices as they are
* probed, but not for bridge ranges
*/