diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0005-irq-bcm2836-Prevent-spurious-interrupts-and-trap-the.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0005-irq-bcm2836-Prevent-spurious-interrupts-and-trap-the.patch | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0005-irq-bcm2836-Prevent-spurious-interrupts-and-trap-the.patch b/target/linux/brcm2708/patches-4.4/0005-irq-bcm2836-Prevent-spurious-interrupts-and-trap-the.patch new file mode 100644 index 0000000000..a0dc4e7261 --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0005-irq-bcm2836-Prevent-spurious-interrupts-and-trap-the.patch @@ -0,0 +1,31 @@ +From 38395f1ae1258743c3e0081c86bb4b65ad06dd69 Mon Sep 17 00:00:00 2001 +From: Phil Elwell <phil@raspberrypi.org> +Date: Fri, 4 Dec 2015 17:41:50 +0000 +Subject: [PATCH 005/127] 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 | 3 ++- + 1 file changed, 2 insertions(+), 1 deletion(-) + +--- a/drivers/irqchip/irq-bcm2836.c ++++ b/drivers/irqchip/irq-bcm2836.c +@@ -170,9 +170,10 @@ __exception_irq_entry bcm2836_arm_irqchi + u32 ipi = ffs(mbox_val) - 1; + + writel(1 << ipi, mailbox0); ++ dsb(); + handle_IPI(ipi, regs); + #endif +- } else { ++ } else if (stat) { + u32 hwirq = ffs(stat) - 1; + + handle_IRQ(irq_linear_revmap(intc.domain, hwirq), regs); |