linux-kernel - Re: [PATCH v7 11/14] irqchip: ti-sci-inta: Add support for Interrupt Aggregator driver

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Message-ID: <7d012633-e540-df8f-7c21-07702447cb8a@ti.com>
Date:   Mon, 29 Apr 2019 14:29:33 +0530
From:   Lokesh Vutla <lokeshvutla@...com>
To:     Marc Zyngier <marc.zyngier@....com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, Nishanth Menon <nm@...com>,
        <tglx@...utronix.de>, <jason@...edaemon.net>
CC:     Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, Tero Kristo <t-kristo@...com>,
        Sekhar Nori <nsekhar@...com>, Tony Lindgren <tony@...mide.com>,
        <linus.walleij@...aro.org>, Peter Ujfalusi <peter.ujfalusi@...com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Device Tree Mailing List <devicetree@...r.kernel.org>
Subject: Re: [PATCH v7 11/14] irqchip: ti-sci-inta: Add support for Interrupt
 Aggregator driver



On 29/04/19 2:17 PM, Marc Zyngier wrote:
> On 23/04/2019 11:00, Lokesh Vutla wrote:
>> Hi Marc,
> 
> [...]
> 
>>> +/**
>>> + * ti_sci_inta_set_type() - Update the trigger type of the irq.
>>> + * @data:	Pointer to corresponding irq_data
>>> + * @type:	Trigger type as specified by user
>>> + *
>>> + * Note: This updates the handle_irq callback for level msi.
>>> + *
>>> + * Return 0 if all went well else appropriate error.
>>> + */
>>> +static int ti_sci_inta_set_type(struct irq_data *data, unsigned int type)
>>> +{
>>> +	struct irq_desc *desc = irq_to_desc(data->irq);
>>> +
>>> +	/*
>>> +	 * .alloc default sets handle_edge_irq. But if the user specifies
>>> +	 * that IRQ is level MSI, then update the handle to handle_level_irq
>>> +	 */
>>> +	if (type & IRQF_TRIGGER_HIGH)
>>> +		desc->handle_irq = handle_level_irq;
>>> +
>>> +	return 0;
>>
>>
>> Returning error value is causing request_irq to fail, so still returning 0. Do
>> you suggest any other method to handle this?
> 
> But that is the very point, isn't it? If you pass the wrong triggering
> type to request_irq, it *must* fail. What you should have is something like:
> 
> switch (type & IRQ_TYPE_SENSE_MASK) {
> case IRQF_TRIGGER_HIGH:
> 	desc->handle_irq = handle_level_irq;
> 	return 0;
> case IRQ_TYPE_EDGE_RISING:
> 	return 0;
> default:
> 	return -EINVAL;
> }
> 
> (adjust as necessary).
> 
> What's wrong with this?

I get it. Will fix it in next version. I also got the firmware update as well.
If you are okay with rest of the series, I want to post the next version with
the firmware update.

Thanks and regards,
Lokesh