openwrtv3/target/linux/brcm2708/patches-4.9/0006-irq-bcm2836-Prevent-spurious-interrupts-and-trap-the.patch
Álvaro Fernández Rojas baad22eed3 brcm2708: update linux 4.9 patches to latest version
As usual these patches were extracted and rebased from the raspberry pi repo:
https://github.com/raspberrypi/linux/tree/rpi-4.9.y

- Remove led1 from diag.sh for RPi3 since it causes boot issues.
- Fix modules.mk typos.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
2017-03-04 19:37:50 +01:00

26 lines
884 B
Diff

From 0badcb291f4fb5c3477c37b4ad4a0e27dd863272 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) {