On 17/03/16 14:19, Jon Hunter wrote:
> Some IRQ chips, such as GPIO controllers or secondary level interrupt
> controllers, may require require additional runtime power management
> control to ensure they are accessible. For such IRQ chips, it makes sense
> to enable the IRQ chip when interrupts are requested and disabled them
> again once all interrupts have been freed.
>
> When mapping an IRQ, the IRQ type settings are read and then programmed.
> The mapping of the IRQ happens before the IRQ is requested and so the
> programming of the type settings occurs before the IRQ is requested. This
> is a problem for IRQ chips that require additional power management
> control because they may not be accessible yet. Therefore, when mapping
> the IRQ, don't program the type settings, just save them and then program
> these saved settings when the IRQ is requested (so long as if they are not
> overridden via the call to request the IRQ).
>
> Add a stub function for irq_domain_free_irqs() to avoid any compilation
> errors when CONFIG_IRQ_DOMAIN_HIERARCHY is not selected.
>
> Signed-off-by: Jon Hunter <jonathanh@xxxxxxxxxx>
> ---
> include/linux/irqdomain.h | 3 +++
> kernel/irq/irqdomain.c | 18 ++++++++++++++----
> kernel/irq/manage.c | 7 +++++++
> 3 files changed, 24 insertions(+), 4 deletions(-)
>
> diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
> index 2aed04396210..fc66876d1965 100644
> --- a/include/linux/irqdomain.h
> +++ b/include/linux/irqdomain.h
> @@ -440,6 +440,9 @@ static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
> return -1;
> }
>
> +static inline void irq_domain_free_irqs(unsigned int virq,
> + unsigned int nr_irqs) { }
> +
> static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
> {
> return false;
> diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
> index 0ea285baa619..332bee2205e0 100644
> --- a/kernel/irq/irqdomain.c
> +++ b/kernel/irq/irqdomain.c
> @@ -576,6 +576,7 @@ static void of_phandle_args_to_fwspec(struct of_phandle_args *irq_data,
> unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
> {
> struct irq_domain *domain;
> + struct irq_data *irq_data;
> irq_hw_number_t hwirq;
> unsigned int cur_type = IRQ_TYPE_NONE;
> unsigned int type = IRQ_TYPE_NONE;
> @@ -638,10 +639,19 @@ unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
> return 0;
> }
>
> - /* Set type if specified and different than the current one */
> - if (type != IRQ_TYPE_NONE &&
> - type != irq_get_trigger_type(virq))
> - irq_set_irq_type(virq, type);
> + irq_data = irq_get_irq_data(virq);
> + if (!irq_data) {
> + if (irq_domain_is_hierarchy(domain))
> + irq_domain_free_irqs(virq, 1);
> + else
> + irq_dispose_mapping(virq);
> +
> + return 0;
> + }
I should only free/dispose here if we actually created it! Will fix this
as well :-(
Jon
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