On Marvell Berlin SoCs, the cpu's local timer is shutdown when the cpu goes to a deep idle state, then the timer framework will be notified to use a broadcast timer instead. The broadcast timer uses dw-apb-ictl as interrupt chip, this patch adds irq_set_affinity support so that the going to deep idle state cpu can set the interrupt affinity of the broadcast interrupt to avoid unnecessary wakeups and IPIs.
I believe this patch will also benefit other dw-apb-ictl users. Signed-off-by: Jisheng Zhang <[email protected]> --- drivers/irqchip/irq-dw-apb-ictl.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/drivers/irqchip/irq-dw-apb-ictl.c b/drivers/irqchip/irq-dw-apb-ictl.c index 8bef7f7..efc0aec 100644 --- a/drivers/irqchip/irq-dw-apb-ictl.c +++ b/drivers/irqchip/irq-dw-apb-ictl.c @@ -29,6 +29,7 @@ struct dw_apb_ictl_priv { struct irq_domain *domain; + unsigned int parent_irq; }; static void dw_apb_ictl_handler(unsigned int irq, struct irq_desc *desc) @@ -56,6 +57,21 @@ static void dw_apb_ictl_handler(unsigned int irq, struct irq_desc *desc) chained_irq_exit(chip, desc); } +static int dw_apb_ictl_set_affinity(struct irq_data *d, + const struct cpumask *mask_val, + bool force) +{ + struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); + struct dw_apb_ictl_priv *priv = gc->private; + struct irq_chip *chip = irq_get_chip(priv->parent_irq); + struct irq_data *data = irq_get_irq_data(priv->parent_irq); + + if (chip && chip->irq_set_affinity) + return chip->irq_set_affinity(data, mask_val, force); + else + return -EINVAL; +} + #ifdef CONFIG_PM static void dw_apb_ictl_resume(struct irq_data *d) { @@ -95,6 +111,8 @@ static int __init dw_apb_ictl_init(struct device_node *np, goto err_free; } + priv->parent_irq = irq; + ret = of_address_to_resource(np, 0, &r); if (ret) { pr_err("%s: unable to get resource\n", np->full_name); @@ -160,6 +178,7 @@ static int __init dw_apb_ictl_init(struct device_node *np, gc->chip_types[0].chip.irq_mask = irq_gc_mask_set_bit; gc->chip_types[0].chip.irq_unmask = irq_gc_mask_clr_bit; gc->chip_types[0].chip.irq_resume = dw_apb_ictl_resume; + gc->chip_types[0].chip.irq_set_affinity = dw_apb_ictl_set_affinity; if (nrirqs > 32) { gc->chip_types[1].regs.mask = APB_INT_MASK_H; @@ -167,6 +186,8 @@ static int __init dw_apb_ictl_init(struct device_node *np, gc->chip_types[1].chip.irq_mask = irq_gc_mask_set_bit; gc->chip_types[1].chip.irq_unmask = irq_gc_mask_clr_bit; gc->chip_types[1].chip.irq_resume = dw_apb_ictl_resume; + gc->chip_types[1].chip.irq_set_affinity = + dw_apb_ictl_set_affinity; } irq_set_handler_data(irq, gc); -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
