From: Tomasz Figa <tomasz.figa@gmail.com>
To: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Cc: Sudeep Holla <sudeep.holla@arm.com>,
Doug Anderson <dianders@chromium.org>,
Krzysztof Kozlowski <k.kozlowski@samsung.com>,
"linux-samsung-soc@vger.kernel.org"
<linux-samsung-soc@vger.kernel.org>,
Jason Cooper <jason@lakedaemon.net>,
Chanho Park <parkch98@gmail.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Kukjin Kim <kgene@kernel.org>,
Peter Chubb <peter.chubb@nicta.com.au>,
Shuah Khan <shuahkhan@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v2 1/1] irqchip: exynos-combiner: Save IRQ enable set on suspend
Date: Tue, 16 Jun 2015 21:32:08 +0900 [thread overview]
Message-ID: <CA+Ln22H8A5xY4S=yEnftTKUdsAM3Oib2gZV_GG=m6nENn2fw0g@mail.gmail.com> (raw)
In-Reply-To: <557EE890.2050001@collabora.co.uk>
2015-06-16 0:00 GMT+09:00 Javier Martinez Canillas
<javier.martinez@collabora.co.uk>:
> Hello Sudeep,
>
> On 06/15/2015 11:01 AM, Sudeep Holla wrote:
>>
>>
>> On 15/06/15 08:46, Javier Martinez Canillas wrote:
>> [...]
>>
>>>
>>> Sudeep, so we may need something like $subject after all from Doug's
>>> explanations since the combiner chip state is lost during a S2R. I know
>>> that it adds more duplicated code (others irqchip drivers do the same)
>>> and it may not scale well if a chip has many registers but is the best
>>> solution I could came with.
>>>
>>
>> OK
>>
>>> If you have a suggestion for a better alternative, I can give a try and
>>> write the patch. But I think $subject could also land to fix this issue
>>> since is a very non intrusive change and later can be changed once the
>>> irqchip core supports this use case.
>>>
>>
>> Agreed. But I would suggest also to add MASK_ON_SUSPEND and set_irq_wake
>> also and then you can restore iff it's non-zero as irq core will take
>> care of most of the non-wakeup sources. Because I am planning to push
>
> I've looking at this and a problem I found is that IIUC the set_irq_wake
> is not propagated from the the Exynos pinctrl / GPIO driver which is the
> combiner's external interrupt source so the callback is never called.
> Which means that right now only the state of the wakeup source IRQs can't
> be saved since that information is not present.
>
> The drivers/pinctrl/samsung/pinctrl-exynos.c driver enables and disables
> the combiner interrupts but its .irq_set_wake handler only updates the
> wakeup source mask for the external interrupts but does not call the
> combiner .set_irq_wake so that should be changed as well.
>
As far as I'm aware of, wake-up events from pin controllers don't go
through GIC, but rather directly to PMU, which is a dedicated unit
responsible for power management and not a standalone interrupt
controller (well actually I saw a series making it a cascaded
controller some time ago, but I'm not sure if that went in). Based on
this, I don't think we have to call set_irq_wake on GIC. Correct me if
I'm wrong, though.
Best regards,
Tomasz
WARNING: multiple messages have this Message-ID (diff)
From: tomasz.figa@gmail.com (Tomasz Figa)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 1/1] irqchip: exynos-combiner: Save IRQ enable set on suspend
Date: Tue, 16 Jun 2015 21:32:08 +0900 [thread overview]
Message-ID: <CA+Ln22H8A5xY4S=yEnftTKUdsAM3Oib2gZV_GG=m6nENn2fw0g@mail.gmail.com> (raw)
In-Reply-To: <557EE890.2050001@collabora.co.uk>
2015-06-16 0:00 GMT+09:00 Javier Martinez Canillas
<javier.martinez@collabora.co.uk>:
> Hello Sudeep,
>
> On 06/15/2015 11:01 AM, Sudeep Holla wrote:
>>
>>
>> On 15/06/15 08:46, Javier Martinez Canillas wrote:
>> [...]
>>
>>>
>>> Sudeep, so we may need something like $subject after all from Doug's
>>> explanations since the combiner chip state is lost during a S2R. I know
>>> that it adds more duplicated code (others irqchip drivers do the same)
>>> and it may not scale well if a chip has many registers but is the best
>>> solution I could came with.
>>>
>>
>> OK
>>
>>> If you have a suggestion for a better alternative, I can give a try and
>>> write the patch. But I think $subject could also land to fix this issue
>>> since is a very non intrusive change and later can be changed once the
>>> irqchip core supports this use case.
>>>
>>
>> Agreed. But I would suggest also to add MASK_ON_SUSPEND and set_irq_wake
>> also and then you can restore iff it's non-zero as irq core will take
>> care of most of the non-wakeup sources. Because I am planning to push
>
> I've looking at this and a problem I found is that IIUC the set_irq_wake
> is not propagated from the the Exynos pinctrl / GPIO driver which is the
> combiner's external interrupt source so the callback is never called.
> Which means that right now only the state of the wakeup source IRQs can't
> be saved since that information is not present.
>
> The drivers/pinctrl/samsung/pinctrl-exynos.c driver enables and disables
> the combiner interrupts but its .irq_set_wake handler only updates the
> wakeup source mask for the external interrupts but does not call the
> combiner .set_irq_wake so that should be changed as well.
>
As far as I'm aware of, wake-up events from pin controllers don't go
through GIC, but rather directly to PMU, which is a dedicated unit
responsible for power management and not a standalone interrupt
controller (well actually I saw a series making it a cascaded
controller some time ago, but I'm not sure if that went in). Based on
this, I don't think we have to call set_irq_wake on GIC. Correct me if
I'm wrong, though.
Best regards,
Tomasz
next prev parent reply other threads:[~2015-06-16 12:32 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-12 5:43 [PATCH v2 1/1] irqchip: exynos-combiner: Save IRQ enable set on suspend Javier Martinez Canillas
2015-06-12 5:43 ` Javier Martinez Canillas
2015-06-12 5:57 ` Krzysztof Kozlowski
2015-06-12 5:57 ` Krzysztof Kozlowski
2015-06-12 10:10 ` Sudeep Holla
2015-06-12 10:10 ` Sudeep Holla
2015-06-12 10:42 ` Krzysztof Kozlowski
2015-06-12 10:42 ` Krzysztof Kozlowski
2015-06-12 10:56 ` Sudeep Holla
2015-06-12 10:56 ` Sudeep Holla
2015-06-12 11:27 ` Javier Martinez Canillas
2015-06-12 11:27 ` Javier Martinez Canillas
2015-06-12 11:54 ` Sudeep Holla
2015-06-12 11:54 ` Sudeep Holla
2015-06-12 12:57 ` Javier Martinez Canillas
2015-06-12 12:57 ` Javier Martinez Canillas
2015-06-12 19:36 ` Javier Martinez Canillas
2015-06-12 19:36 ` Javier Martinez Canillas
2015-06-12 20:17 ` Doug Anderson
2015-06-12 20:17 ` Doug Anderson
2015-06-15 7:46 ` Javier Martinez Canillas
2015-06-15 7:46 ` Javier Martinez Canillas
2015-06-15 9:01 ` Sudeep Holla
2015-06-15 9:01 ` Sudeep Holla
2015-06-15 15:00 ` Javier Martinez Canillas
2015-06-15 15:00 ` Javier Martinez Canillas
2015-06-15 15:08 ` Sudeep Holla
2015-06-15 15:08 ` Sudeep Holla
2015-06-15 15:23 ` Javier Martinez Canillas
2015-06-15 15:23 ` Javier Martinez Canillas
2015-06-15 23:57 ` Krzysztof Kozlowski
2015-06-15 23:57 ` Krzysztof Kozlowski
2015-06-16 3:19 ` Javier Martinez Canillas
2015-06-16 3:19 ` Javier Martinez Canillas
2015-06-16 8:21 ` Thomas Gleixner
2015-06-16 8:21 ` Thomas Gleixner
2015-06-16 12:32 ` Tomasz Figa [this message]
2015-06-16 12:32 ` Tomasz Figa
2015-06-16 13:11 ` Sudeep Holla
2015-06-16 13:11 ` Sudeep Holla
2015-06-15 8:52 ` Sudeep Holla
2015-06-15 8:52 ` Sudeep Holla
2015-06-16 9:36 ` [tip:irq/core] " tip-bot for Javier Martinez Canillas
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