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SubjectRe: [PATCH v4 2/2] PCI: Rockchip: Add Rockchip PCIe controller support
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在 2016/7/1 18:32, Marc Zyngier 写道:
> On 01/07/16 02:24, Shawn Lin wrote:
>> This patch adds Rockchip PCIe controller support found
>> on RK3399 Soc platform.
>>
>> Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
>>
>> ---
>
> [...]
>
>> +static void rockchip_pcie_legacy_int_handler(struct irq_desc *desc)
>> +{
>> + struct irq_chip *chip = irq_desc_get_chip(desc);
>> + struct rockchip_pcie_port *port;
>> + u32 reg;
>> +
>> + chained_irq_enter(chip, desc);
>> + port = irq_desc_get_handler_data(desc);
>> +
>> + reg = pcie_read(port, PCIE_CLIENT_INT_STATUS);
>> + reg = (reg & ROCKCHIP_PCIE_RPIFR1_INTR_MASK) >>
>> + ROCKCHIP_PCIE_RPIFR1_INTR_SHIFT;
>> + if (reg)
>> + generic_handle_irq(irq_find_mapping(port->irq_domain,
>> + ffs(reg)));
>
> Can't you get multiple pending interrupts at the same time? Here, you
> seem to only process one interrupt at a time, which is going to be
> pretty inefficient.
>

Yup, will fix it, thanks.

> How about something like:
>
> while (reg) {
> int hwirq = ffs(reg);
> int irq;
>
> reg &= ~BIT(hwirq);
> irq = irq_find_mapping(port->irq_domain, hwirq);
> if (irq)
> generic_handle_irq(irq);
> }
>
>> + chained_irq_exit(chip, desc);
>> +}
>> +
>
> Thanks,
>
> M.
>


--
Best Regards
Shawn Lin

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