1 files changed, 11 insertions, 1 deletions

diff --git a/arch/arc/kernel/intc-arcv2.c b/arch/arc/kernel/intc-arcv2.c
index 4d3166f9bbc9..f928795fd07a 100644
--- a/arch/arc/kernel/intc-arcv2.c
+++ b/arch/arc/kernel/intc-arcv2.c
@@ -32,7 +32,7 @@ struct bcr_irq_arcv2 {
  */
 void arc_init_IRQ(void)
 {
-        unsigned int tmp, irq_prio;
+        unsigned int tmp, irq_prio, i;
         struct bcr_irq_arcv2 irq_bcr;
 
         struct aux_irq_ctrl {
@@ -71,6 +71,16 @@ void arc_init_IRQ(void)
                 irq_prio + 1, ARCV2_IRQ_DEF_PRIO,
                 irq_bcr.firq ? " FIRQ (not used)":"");
 
+        /*
+         * Set a default priority for all available interrupts to prevent
+         * switching of register banks if Fast IRQ and multiple register banks
+         * are supported by CPU.
+         */
+        for (i = NR_EXCEPTIONS; i < irq_bcr.irqs + NR_EXCEPTIONS; i++) {
+                write_aux_reg(AUX_IRQ_SELECT, i);
+                write_aux_reg(AUX_IRQ_PRIORITY, ARCV2_IRQ_DEF_PRIO);
+        }
+
         /* setup status32, don't enable intr yet as kernel doesn't want */
         tmp = read_aux_reg(ARC_REG_STATUS32);
         tmp |= STATUS_AD_MASK | (ARCV2_IRQ_DEF_PRIO << 1);