3 files changed, 9 insertions, 1 deletions

diff --git a/arch/powerpc/platforms/pasemi/setup.c b/arch/powerpc/platforms/pasemi/setup.c
index eb271fded876..1940e678878e 100644
--- a/arch/powerpc/platforms/pasemi/setup.c
+++ b/arch/powerpc/platforms/pasemi/setup.c
@@ -224,7 +224,7 @@ static __init void pas_init_IRQ(void)
         openpic_addr = of_read_number(opprop, naddr);
         printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 
-        mpic_flags = MPIC_PRIMARY | MPIC_LARGE_VECTORS;
+        mpic_flags = MPIC_PRIMARY | MPIC_LARGE_VECTORS | MPIC_NO_BIAS;
 
         nmiprop = of_get_property(mpic_node, "nmi-source", NULL);
         if (nmiprop)
diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index 5a9d8c141e60..f88ff09c4711 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c
@@ -1279,6 +1279,11 @@ void __init mpic_init(struct mpic *mpic)
                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
                            | MPIC_GREG_GCONF_8259_PTHROU_DIS);
 
+        if (mpic->flags & MPIC_NO_BIAS)
+                mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
+                        mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
+                        | MPIC_GREG_GCONF_NO_BIAS);
+
         /* Set current processor priority to 0 */
         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
 
diff --git a/include/asm-powerpc/mpic.h b/include/asm-powerpc/mpic.h
index e7ac8109b6e7..943c5a3fac8a 100644
--- a/include/asm-powerpc/mpic.h
+++ b/include/asm-powerpc/mpic.h
@@ -22,6 +22,7 @@
 #define MPIC_GREG_GLOBAL_CONF_0         0x00020
 #define         MPIC_GREG_GCONF_RESET                   0x80000000
 #define         MPIC_GREG_GCONF_8259_PTHROU_DIS         0x20000000
+#define         MPIC_GREG_GCONF_NO_BIAS                 0x10000000
 #define         MPIC_GREG_GCONF_BASE_MASK               0x000fffff
 #define         MPIC_GREG_GCONF_MCK                     0x08000000
 #define MPIC_GREG_GLOBAL_CONF_1         0x00030
@@ -350,6 +351,8 @@ struct mpic
 #define MPIC_LARGE_VECTORS              0x00000100
 /* Enable delivery of prio 15 interrupts as MCK instead of EE */
 #define MPIC_ENABLE_MCK                 0x00000200
+/* Disable bias among target selection, spread interrupts evenly */
+#define MPIC_NO_BIAS                    0x00000400
 
 /* MPIC HW modification ID */
 #define MPIC_REGSET_MASK                0xf0000000