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@xxxxxxxxxxxxxx>
>
> ---
[...]
> +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.
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.
--
Jazz is not dead. It just smells funny...
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
