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From: Lina Iyer <ilina@codeaurora.org>
To: Stephen Boyd <swboyd@chromium.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>,
	evgreen@chromium.org, linus.walleij@linaro.org,
	bjorn.andersson@linaro.org, rplsssn@codeaurora.org,
	linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	rnayak@codeaurora.org, devicetree@vger.kernel.org
Subject: Re: [PATCH RESEND RFC 1/4] drivers: pinctrl: qcom: add wakeup capability to GPIO
Date: Fri, 10 Aug 2018 10:15:56 -0600	[thread overview]
Message-ID: <20180810161556.GC5081@codeaurora.org> (raw)
In-Reply-To: <153391359077.37448.3410612264580038499@swboyd.mtv.corp.google.com>

On Fri, Aug 10 2018 at 09:06 -0600, Stephen Boyd wrote:
>Quoting Marc Zyngier (2018-08-10 00:45:12)
>> On Thu, 09 Aug 2018 18:30:53 +0100,
>> Stephen Boyd <swboyd@chromium.org> wrote:
>> >
>> > Quoting Marc Zyngier (2018-08-07 23:26:32)
>> > >
>> > > Level interrupts should be taken care of without doing anything, by the
>> > > very nature of being a level signal.
>> >
>> > Right. I suspect we'll still need to configure the PDC to actually wake
>> > up on the level triggered signal though so PDC needs to be told to
>> > unmask the line.
>>
>> Surely this can be done at suspend time with the PDC driver tracking
>> the interrupts that are configured as a wake-up source (although it
>> needs to track an interrupt that is logically connected to the TLMM,
>> which sucks).
>
>The PDC also needs to be configured for wakeups from deep CPU idle
>states where the GIC and TLMM are powered down. Lina, can you confirm
>this?
>
Yes, it will need to be handled as part of CPU idle as well, when the
last CPU powers down.

>Hooking system suspend in that case won't work. Is your hope that we can
>avoid using hierarchical irqdomains here entirely?
>
Well, I wasn't trying to avoid hierarchical irqdomains, there were
restrictions in using it. Not all GPIO pins have parent in PDC and the
ones that have are all not from the same bank either.

-- Lina


  reply	other threads:[~2018-08-10 16:16 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-01  2:00 [PATCH RESEND RFC 0/4] Wakeup GPIO support for SDM845 SoC Lina Iyer
2018-08-01  2:00 ` [PATCH RESEND RFC 1/4] drivers: pinctrl: qcom: add wakeup capability to GPIO Lina Iyer
2018-08-01  6:31   ` Marc Zyngier
2018-08-01 19:45     ` Lina Iyer
2018-08-01 22:36       ` Bjorn Andersson
2018-08-02  2:10         ` Lina Iyer
2018-08-02  6:08       ` Marc Zyngier
2018-08-02  6:51         ` Lina Iyer
2018-08-02  7:27           ` Marc Zyngier
2018-08-02 12:58             ` Lina Iyer
2018-08-08  6:05               ` Stephen Boyd
2018-08-08  6:26                 ` Marc Zyngier
2018-08-09 17:30                   ` Stephen Boyd
2018-08-10  7:45                     ` Marc Zyngier
2018-08-10 15:06                       ` Stephen Boyd
2018-08-10 16:15                         ` Lina Iyer [this message]
2018-08-01  2:00 ` [PATCH RESEND RFC 2/4] drivers: pinctrl: qcom: add wakeup gpio map for sdm845 Lina Iyer
2018-08-01  8:42   ` Marc Zyngier
2018-08-01 20:04     ` Lina Iyer
2018-08-13 19:41       ` Lina Iyer
2018-08-14  9:26         ` Marc Zyngier
2018-08-01  2:00 ` [PATCH RESEND RFC 3/4] arm64: dts: msm: add PDC device bindings " Lina Iyer
2018-08-01  2:00 ` [PATCH RESEND RFC 4/4] arm64: dts: qcom: add wake up interrupts for GPIOs Lina Iyer

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