mpic_irq_set_wake return -ENXIO for non FSL MPIC and sets IRQF_NO_SUSPEND
flag for FSL ones. enable_irq_wake already returns -ENXIO if irq_set_wak
is not implemented. Also there's no need to set the IRQF_NO_SUSPEND flag
as it doesn't guarantee wakeup for that interrupt.

This patch removes the redundant mpic_irq_set_wake and sets the
IRQCHIP_SKIP_SET_WAKE for only FSL MPIC.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <redacted>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Scott Wood <redacted>
Cc: Hongtao Jia <redacted>
Cc: Marc Zyngier <redacted>
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Sudeep Holla <redacted>
---
 arch/powerpc/sysdev/mpic.c | 23 ++++-------------------
 1 file changed, 4 insertions(+), 19 deletions(-)

diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index 537e5db85a06..123e43612f0a 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c

@@ -924,22 +924,6 @@ int mpic_set_irq_type(struct irq_data *d, unsigned int 

flow_type)
      return IRQ_SET_MASK_OK_NOCOPY;
 }
 
-static int mpic_irq_set_wake(struct irq_data *d, unsigned int on)
-{
-     struct irq_desc *desc = container_of(d, struct irq_desc, irq_data);
-     struct mpic *mpic = mpic_from_irq_data(d);
-
-     if (!(mpic->flags & MPIC_FSL))
-             return -ENXIO;
-
-     if (on)
-             desc->action->flags |= IRQF_NO_SUSPEND;
-     else
-             desc->action->flags &= ~IRQF_NO_SUSPEND;
-
-     return 0;
-}
-
 void mpic_set_vector(unsigned int virq, unsigned int vector)
 {
      struct mpic *mpic = mpic_from_irq(virq);

@@ -977,7 +961,6 @@ static struct irq_chip mpic_irq_chip = {
      .irq_unmask     = mpic_unmask_irq,
      .irq_eoi        = mpic_end_irq,
      .irq_set_type   = mpic_set_irq_type,
-     .irq_set_wake   = mpic_irq_set_wake,
 };
 
 #ifdef CONFIG_SMP

@@ -992,7 +975,6 @@ static struct irq_chip mpic_tm_chip = {
      .irq_mask       = mpic_mask_tm,
      .irq_unmask     = mpic_unmask_tm,
      .irq_eoi        = mpic_end_irq,
-     .irq_set_wake   = mpic_irq_set_wake,
 };
 
 #ifdef CONFIG_MPIC_U3_HT_IRQS

@@ -1283,8 +1265,11 @@ struct mpic * __init mpic_alloc(struct device_node 

*node,
              flags |= MPIC_NO_RESET;
      if (of_get_property(node, "single-cpu-affinity", NULL))
              flags |= MPIC_SINGLE_DEST_CPU;
-     if (of_device_is_compatible(node, "fsl,mpic"))
+     if (of_device_is_compatible(node, "fsl,mpic")) {
              flags |= MPIC_FSL | MPIC_LARGE_VECTORS;
+             mpic_irq_chip.flags |= IRQCHIP_SKIP_SET_WAKE;
+             mpic_tm_chip.flags |= IRQCHIP_SKIP_SET_WAKE;
+     }