27 lines
884 B
Diff
27 lines
884 B
Diff
|
From 3fad09910dafeb93a351aefa90ca4fd490f68c84 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Phil Elwell <phil@raspberrypi.org>
|
||
|
|
Date: Fri, 4 Dec 2015 17:41:50 +0000
|
||
|
|
Subject: [PATCH] irq-bcm2836: Prevent spurious interrupts, and trap them early
|
||
|
|
|
||
|
|
The old arch-specific IRQ macros included a dsb to ensure the
|
||
|
|
write to clear the mailbox interrupt completed before returning
|
||
|
|
from the interrupt. The BCM2836 irqchip driver needs the same
|
||
|
|
precaution to avoid spurious interrupts.
|
||
|
|
|
||
|
|
Spurious interrupts are still possible for other reasons,
|
||
|
|
though, so trap them early.
|
||
|
|
---
|
||
|
|
drivers/irqchip/irq-bcm2836.c | 1 +
|
||
|
|
1 file changed, 1 insertion(+)
|
||
|
|
|
||
|
|
--- a/drivers/irqchip/irq-bcm2836.c
|
||
|
|
+++ b/drivers/irqchip/irq-bcm2836.c
|
||
|
|
@@ -175,6 +175,7 @@ __exception_irq_entry bcm2836_arm_irqchi
|
||
|
|
u32 ipi = ffs(mbox_val) - 1;
|
||
|
|
|
||
|
|
writel(1 << ipi, mailbox0);
|
||
|
|
+ dsb(sy);
|
||
|
|
handle_IPI(ipi, regs);
|
||
|
|
#endif
|
||
|
|
} else if (stat) {
|