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From: Marc Zyngier <marc.zyngier@arm.com>
To: Stephen Boyd <swboyd@chromium.org>
Cc: Lina Iyer <ilina@codeaurora.org>,
	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: Wed, 8 Aug 2018 07:26:32 +0100
Message-ID: <20180808072632.21f076b6@why.wild-wind.fr.eu.org> (raw)
In-Reply-To: <153370830708.220756.4595316550560511917@swboyd.mtv.corp.google.com>

On Tue, 07 Aug 2018 23:05:07 -0700
Stephen Boyd <swboyd@chromium.org> wrote:

> Quoting Lina Iyer (2018-08-02 05:58:27)
> > On Thu, Aug 02 2018 at 01:27 -0600, Marc Zyngier wrote:  
> > >
> > >Sure. But once woken up (GIC *and* TLMM), the gpio line (which I
> > >assume is level) is still high at the TLMM input. So why isn't it
> > >registering that state once it has been woken up?
> > >
> > >I can understand that it would be missing an edge. But that doesn't
> > >hold for level signalling.
> > >  
> > Sure, yes. Sorry for not registering your point in my response.
> > Once woken up we should see the level interrupt in TLMM.  
> 
> And the level type gpio interrupt will trigger the TLMM summary
> interrupt line after the wakeup? So then the only thing that needs to be
> replayed is edge interrupts? How are edge interrupts going to be
> replayed?

Level interrupts should be taken care of without doing anything, by the
very nature of being a level signal.

Edge interrupts should be replayed using check_irq_resend() after
taking the right locks and making the interrupt pending. Or, if there
is a way for SW to make the interrupt pending at the TLMM level, to use
that as a way to reinject the interrupt (which would be the preferred
way, as it avoids all kind of ugly locking considerations).

Thanks,

	M.
-- 
Without deviation from the norm, progress is not possible.

  reply index

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 [this message]
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
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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