MIPS: Alchemy: Fix hang with high-frequency edge interrupts

The handle_edge_irq() flowhandler disables edge int sources which occur
too fast (i.e. another edge comes in before the irq handler function
had a chance to finish).  Currently, the mask_ack() callback does not
ack the edges in hardware, leading to an endless loop in the flowhandler
where it tries to shut up the irq source.

When I rewrote the alchemy IRQ code  I wrongly assumed the mask_ack()
callback was only used by the level flowhandler, hence it omitted the
(at the time pointless) edge acks.  Turned out I was wrong; so here
is a complete mask_ack implementation for Alchemy IC, which fixes
the above mentioned problem.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 26 insertions, 8 deletions

diff --git a/arch/mips/alchemy/common/irq.c b/arch/mips/alchemy/common/irq.c
index c88c821b4c3..d670928afcf 100644
--- a/arch/mips/alchemy/common/irq.c
+++ b/arch/mips/alchemy/common/irq.c
@@ -354,6 +354,28 @@ static void au1x_ic1_ack(unsigned int irq_nr)
         au_sync();
 }
 
+static void au1x_ic0_maskack(unsigned int irq_nr)
+{
+        unsigned int bit = irq_nr - AU1000_INTC0_INT_BASE;
+
+        au_writel(1 << bit, IC0_WAKECLR);
+        au_writel(1 << bit, IC0_MASKCLR);
+        au_writel(1 << bit, IC0_RISINGCLR);
+        au_writel(1 << bit, IC0_FALLINGCLR);
+        au_sync();
+}
+
+static void au1x_ic1_maskack(unsigned int irq_nr)
+{
+        unsigned int bit = irq_nr - AU1000_INTC1_INT_BASE;
+
+        au_writel(1 << bit, IC1_WAKECLR);
+        au_writel(1 << bit, IC1_MASKCLR);
+        au_writel(1 << bit, IC1_RISINGCLR);
+        au_writel(1 << bit, IC1_FALLINGCLR);
+        au_sync();
+}
+
 static int au1x_ic1_setwake(unsigned int irq, unsigned int on)
 {
         unsigned int bit = irq - AU1000_INTC1_INT_BASE;
@@ -379,25 +401,21 @@ static int au1x_ic1_setwake(unsigned int irq, unsigned int on)
 /*
  * irq_chips for both ICs; this way the mask handlers can be
  * as short as possible.
- *
- * NOTE: the ->ack() callback is used by the handle_edge_irq
- *       flowhandler only, the ->mask_ack() one by handle_level_irq,
- *       so no need for an irq_chip for each type of irq (level/edge).
  */
 static struct irq_chip au1x_ic0_chip = {
         .name           = "Alchemy-IC0",
-        .ack            = au1x_ic0_ack,         /* edge */
+        .ack            = au1x_ic0_ack,
         .mask           = au1x_ic0_mask,
-        .mask_ack       = au1x_ic0_mask,        /* level */
+        .mask_ack       = au1x_ic0_maskack,
         .unmask         = au1x_ic0_unmask,
         .set_type       = au1x_ic_settype,
 };
 
 static struct irq_chip au1x_ic1_chip = {
         .name           = "Alchemy-IC1",
-        .ack            = au1x_ic1_ack,         /* edge */
+        .ack            = au1x_ic1_ack,
         .mask           = au1x_ic1_mask,
-        .mask_ack       = au1x_ic1_mask,        /* level */
+        .mask_ack       = au1x_ic1_maskack,
         .unmask         = au1x_ic1_unmask,
         .set_type       = au1x_ic_settype,
         .set_wake       = au1x_ic1_setwake,