Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull irq fixes from Thomas Gleixner:
 "Another four fixlets to tame the ARM orion irq chip"

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip: orion: Fix getting generic chip pointer.
  irqchip: orion: clear stale interrupts in irq_startup
  irqchip: orion: use handle_edge_irq on bridge irqs
  irqchip: orion: clear bridge cause register on init

1 files changed, 19 insertions, 3 deletions

diff --git a/drivers/irqchip/irq-orion.c b/drivers/irqchip/irq-orion.c
index e51d40031884..8e41be62812e 100644
--- a/drivers/irqchip/irq-orion.c
+++ b/drivers/irqchip/irq-orion.c
@@ -111,7 +111,8 @@ IRQCHIP_DECLARE(orion_intc, "marvell,orion-intc", orion_irq_init);
 static void orion_bridge_irq_handler(unsigned int irq, struct irq_desc *desc)
 {
         struct irq_domain *d = irq_get_handler_data(irq);
-        struct irq_chip_generic *gc = irq_get_domain_generic_chip(d, irq);
+
+        struct irq_chip_generic *gc = irq_get_domain_generic_chip(d, 0);
         u32 stat = readl_relaxed(gc->reg_base + ORION_BRIDGE_IRQ_CAUSE) &
                    gc->mask_cache;
 
@@ -123,6 +124,19 @@ static void orion_bridge_irq_handler(unsigned int irq, struct irq_desc *desc)
         }
 }
 
+/*
+ * Bridge IRQ_CAUSE is asserted regardless of IRQ_MASK register.
+ * To avoid interrupt events on stale irqs, we clear them before unmask.
+ */
+static unsigned int orion_bridge_irq_startup(struct irq_data *d)
+{
+        struct irq_chip_type *ct = irq_data_get_chip_type(d);
+
+        ct->chip.irq_ack(d);
+        ct->chip.irq_unmask(d);
+        return 0;
+}
+
 static int __init orion_bridge_irq_init(struct device_node *np,
                                         struct device_node *parent)
 {
@@ -143,7 +157,7 @@ static int __init orion_bridge_irq_init(struct device_node *np,
         }
 
         ret = irq_alloc_domain_generic_chips(domain, nrirqs, 1, np->name,
-                             handle_level_irq, clr, 0, IRQ_GC_INIT_MASK_CACHE);
+                             handle_edge_irq, clr, 0, IRQ_GC_INIT_MASK_CACHE);
         if (ret) {
                 pr_err("%s: unable to alloc irq domain gc\n", np->name);
                 return ret;
@@ -176,12 +190,14 @@ static int __init orion_bridge_irq_init(struct device_node *np,
 
         gc->chip_types[0].regs.ack = ORION_BRIDGE_IRQ_CAUSE;
         gc->chip_types[0].regs.mask = ORION_BRIDGE_IRQ_MASK;
+        gc->chip_types[0].chip.irq_startup = orion_bridge_irq_startup;
         gc->chip_types[0].chip.irq_ack = irq_gc_ack_clr_bit;
         gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
         gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;
 
-        /* mask all interrupts */
+        /* mask and clear all interrupts */
         writel(0, gc->reg_base + ORION_BRIDGE_IRQ_MASK);
+        writel(0, gc->reg_base + ORION_BRIDGE_IRQ_CAUSE);
 
         irq_set_handler_data(irq, domain);
         irq_set_chained_handler(irq, orion_bridge_irq_handler);