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drivers: irq-bcm2836: preserve unrelated bits in LOCAL_GPU_ROUTING

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Interrupts are dispatched round-robin but doing so trampled FIQ routing.
Taking a FIQ on a core without a handler installed is fatal.

Only modify bits 1:0 which are the IRQ route bits.

Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
This commit is contained in:
Jonathan Bell
2024-09-12 10:45:02 +01:00
committed by Dom Cobley
parent 42249db6ca
commit df562b16fb
1 changed files with 8 additions and 3 deletions
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11
drivers/irqchip/irq-bcm2836.c
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@@ -96,12 +96,17 @@ void bcm2836_arm_irqchip_spin_gpu_irq(void)
u32 i;
void __iomem *gpurouting = (intc.base + LOCAL_GPU_ROUTING);
u32 routing_val = readl(gpurouting);
u32 irq_route;
/* Preserve FIQ routing bits */
irq_route = routing_val & 0x3;
routing_val &= ~0x3;
for (i = 1; i <= 3; i++) {
u32 new_routing_val = (routing_val + i) & 3;
irq_route = (irq_route + i) & 0x3;
if (cpu_active(new_routing_val)) {
writel(new_routing_val, gpurouting);
if (cpu_active(irq_route)) {
writel(irq_route | routing_val, gpurouting);
return;
}
}