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| author | Sungbo Eo <mans0n@gorani.run> | 2020-03-21 22:38:42 +0900 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2020-03-22 11:52:16 +0000 |
| commit | 6a214a28132f19ace3d835a6d8f6422ec80ad200 (patch) | |
| tree | 53fd92715339dab893c27f707a5ff7e6c2e0bec0 | |
| parent | b2cb11f4f7643255b7703c0fcabc31a8ec478f3a (diff) | |
| download | lwn-6a214a28132f19ace3d835a6d8f6422ec80ad200.tar.gz lwn-6a214a28132f19ace3d835a6d8f6422ec80ad200.zip | |
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
| -rw-r--r-- | drivers/irqchip/irq-versatile-fpga.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/irqchip/irq-versatile-fpga.c b/drivers/irqchip/irq-versatile-fpga.c index 70e2cfff8175..f1386733d3bc 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 |