From: Sungbo Eo mans0n@gorani.run
commit 6a214a28132f19ace3d835a6d8f6422ec80ad200 upstream.
Clear its own IRQs before the parent IRQ get enabled, so that the remaining IRQs do not accidentally interrupt the parent IRQ controller.
This patch also fixes a reboot bug on OX820 SoC, where the remaining rps-timer IRQ raises a GIC interrupt that is left pending. After that, the rps-timer IRQ is cleared during driver initialization, and there's no IRQ left in rps-irq when local_irq_enable() is called, which evokes an error message "unexpected IRQ trap".
Fixes: bdd272cbb97a ("irqchip: versatile FPGA: support cascaded interrupts from DT") Signed-off-by: Sungbo Eo mans0n@gorani.run Signed-off-by: Marc Zyngier maz@kernel.org Reviewed-by: Linus Walleij linus.walleij@linaro.org Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20200321133842.2408823-1-mans0n@gorani.run Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/irqchip/irq-versatile-fpga.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/irqchip/irq-versatile-fpga.c +++ b/drivers/irqchip/irq-versatile-fpga.c @@ -211,6 +211,9 @@ int __init fpga_irq_of_init(struct devic if (of_property_read_u32(node, "valid-mask", &valid_mask)) valid_mask = 0;
+ writel(clear_mask, base + IRQ_ENABLE_CLEAR); + writel(clear_mask, base + FIQ_ENABLE_CLEAR); + /* Some chips are cascaded from a parent IRQ */ parent_irq = irq_of_parse_and_map(node, 0); if (!parent_irq) { @@ -225,9 +228,6 @@ int __init fpga_irq_of_init(struct devic fpga_irq_init(base, node->name, 0, parent_irq, valid_mask, node); #endif
- writel(clear_mask, base + IRQ_ENABLE_CLEAR); - writel(clear_mask, base + FIQ_ENABLE_CLEAR); - /* * On Versatile AB/PB, some secondary interrupts have a direct * pass-thru to the primary controller for IRQs 20 and 22-31 which need