The following commit has been merged into the irq/core branch of tip:
Commit-ID: 6a214a28132f19ace3d835a6d8f6422ec80ad200 Gitweb: https://git.kernel.org/tip/6a214a28132f19ace3d835a6d8f6422ec80ad200 Author: Sungbo Eo mans0n@gorani.run AuthorDate: Sat, 21 Mar 2020 22:38:42 +09:00 Committer: Marc Zyngier maz@kernel.org CommitterDate: Sun, 22 Mar 2020 11:52:16
irqchip/versatile-fpga: Apply clear-mask earlier
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 --- drivers/irqchip/irq-versatile-fpga.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/irqchip/irq-versatile-fpga.c b/drivers/irqchip/irq-versatile-fpga.c index 70e2cff..f138673 100644 --- a/drivers/irqchip/irq-versatile-fpga.c +++ b/drivers/irqchip/irq-versatile-fpga.c @@ -212,6 +212,9 @@ int __init fpga_irq_of_init(struct device_node *node, 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) { @@ -221,9 +224,6 @@ int __init fpga_irq_of_init(struct device_node *node,
fpga_irq_init(base, node->name, 0, parent_irq, valid_mask, node);
- 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