ARC: [intc] don't mask all IRQ by default

Hardware keeps them enabled on reset, and Linux needs to keep status quo.
Any spurious interrupts will be reported/blocked by genirq.

This helps remove a SMP IRQ quirk (next commit), where a peripheral IRQ
is hard wired to core0, and request_irq()->unmask() happens on core1,
keeping the IRQ masked on core0, needing an explicit unmask.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

diff --git a/arch/arc/kernel/irq.c b/arch/arc/kernel/irq.c
index 835fa5e71b628768993c48d9f2063ec6a4bab609..02ffc764c97a502664d3c6d00f13fac02f6e8666 100644 (file)
--- a/arch/arc/kernel/irq.c
+++ b/arch/arc/kernel/irq.c
@@ -19,21 +19,16 @@
 
 /*
  * Early Hardware specific Interrupt setup
+ * -Platform independent, needed for each CPU (not foldable into init_IRQ)
  * -Called very early (start_kernel -> setup_arch -> setup_processor)
- * -Platform Independent (must for any ARC700)
- * -Needed for each CPU (hence not foldable into init_IRQ)
  *
  * what it does ?
- * -Disable all IRQs (on CPU side)
  * -Optionally, setup the High priority Interrupts as Level 2 IRQs
  */
 void arc_init_IRQ(void)
 {
        int level_mask = 0;
 
-       /* Disable all IRQs: enable them as devices request */
-       write_aux_reg(AUX_IENABLE, 0);
-
        /* setup any high priority Interrupts (Level2 in ARCompact jargon) */
        level_mask |= IS_ENABLED(CONFIG_ARC_IRQ3_LV2) << 3;
        level_mask |= IS_ENABLED(CONFIG_ARC_IRQ5_LV2) << 5;