linux-kernel - Re: [V6,3/9] irqdomain: Don't set type when mapping an IRQ

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Date:   Thu, 17 Aug 2017 22:42:13 +0800
From:   jeffy <jeffy.chen@...k-chips.com>
To:     Marc Zyngier <marc.zyngier@....com>,
        Jon Hunter <jonathanh@...dia.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>
CC:     Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ian Campbell <ijc+devicetree@...lion.org.uk>,
        Kumar Gala <galak@...eaurora.org>,
        Stephen Warren <swarren@...dotorg.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Kevin Hilman <khilman@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-tegra@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, briannorris@...omium.com
Subject: Re: [V6,3/9] irqdomain: Don't set type when mapping an IRQ

Hi Marc,

Thanks for your reply.

On 08/17/2017 09:34 PM, Marc Zyngier wrote:
> On 17/08/17 13:46, jeffy wrote:
>> Hi guys,
>>
>> I hit an problem when testing a level triggered irq with:
>>
>> irq = platform_get_irq_byname(pdev, "wake");
>> ...<-- irq trigger type is correct
>> irq_set_status_flags(irq, IRQ_NOAUTOEN);
>> ...<-- irq trigger type become zero
>> request_threaded_irq(irq, ...)
>>
>> the trigger type lost(irqd_get_trigger_type returns zero) after
>> irq_set_status_flags.
>>
>>
>> it looks like irq_set_status_flags would try to use
>> irq_settings_is_level to get level trigger type, which would get zero
>> since we removed set type here...could you help to check this, thanks :)
>
> Hmm. That's quite unexpected. Can you please try this?
>
> diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
> index a3cc37c0c85e..3675c6004f2a 100644
> --- a/kernel/irq/chip.c
> +++ b/kernel/irq/chip.c
> @@ -1000,7 +1000,7 @@ EXPORT_SYMBOL_GPL(irq_set_chip_and_handler_name);
>
>   void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
>   {
> -	unsigned long flags;
> +	unsigned long flags, trigger, tmp;
>   	struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
>
>   	if (!desc)
> @@ -1014,6 +1014,8 @@ void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
>
>   	irq_settings_clr_and_set(desc, clr, set);
>
> +	trigger = irqd_get_trigger_type(&desc->irq_data);
> +
>   	irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
>   		   IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
>   	if (irq_settings_has_no_balance_set(desc))
> @@ -1025,7 +1027,11 @@ void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
>   	if (irq_settings_is_level(desc))
>   		irqd_set(&desc->irq_data, IRQD_LEVEL);
>
> -	irqd_set(&desc->irq_data, irq_settings_get_trigger_mask(desc));
> +	tmp = irq_settings_get_trigger_mask(desc);
> +	if (tmp != IRQ_TYPE_NONE)
> +		trigger = tmp;
> +
> +	irqd_set(&desc->irq_data, trigger);
>
>   	irq_put_desc_unlock(desc, flags);
>   }
>
> Basically, save the trigger info before clearing it. If the interrupt
> has already been configured, use that. Otherwise restore the previous
> trigger settings. But I'm slightly confused as to which field is used
> for what...

Thanks:), this patch works well, so

Tested-by: Jeffy Chen <jeffy.chen@...k-chips.com>

>
> 	M.
>