platform/mowgli: Limit PHB0/(pec0) to gen3 speed
Use the method provided by Frederic:
Add the "ibm, maximum link speed" attribute to the PHB device tree at index 0.
The phb4.c code will looks for it and set up the link correctly.
@@ -49,6 +49,21 @@ static void vpd_dt_fixup(void)
}
}
+static void phb0_fixup(void)
+{
+ struct dt_node *stk;
+ u32 phb_index;
+
+ /* Limit PHB0/(pec0) to gen3 speed */
+ dt_for_each_compatible(dt_root, stk, "ibm,power9-phb-stack") {
+ phb_index = dt_prop_get_u32_def(stk, "ibm,phb-index", -1);
+ if (phb_index == 0) {
+ dt_check_del_prop(stk, "ibm,max-link-speed");
+ dt_add_property_cells(stk, "ibm,max-link-speed", 3);
+ }
+ }
+}
+
static bool mowgli_probe(void)
{
if (!dt_node_is_compatible(dt_root, "ibm,mowgli"))
@@ -63,6 +78,7 @@ static bool mowgli_probe(void)
vpd_dt_fixup();
slot_table_init(mowgli_phb_table);
+ phb0_fixup();
return true;
}
