diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-4.19/950-0006-irq-bcm2836-Prevent-spurious-interrupts-and-trap-the.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-4.19/950-0006-irq-bcm2836-Prevent-spurious-interrupts-and-trap-the.patch | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-4.19/950-0006-irq-bcm2836-Prevent-spurious-interrupts-and-trap-the.patch b/target/linux/bcm27xx/patches-4.19/950-0006-irq-bcm2836-Prevent-spurious-interrupts-and-trap-the.patch new file mode 100644 index 0000000000..1331c13374 --- /dev/null +++ b/target/linux/bcm27xx/patches-4.19/950-0006-irq-bcm2836-Prevent-spurious-interrupts-and-trap-the.patch @@ -0,0 +1,27 @@ +From 5e9082be2fca137fe13b8af15aa0b9d178cd99c1 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 +@@ -144,6 +144,7 @@ __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) { |