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Date: Wed, 1 Aug 2018 20:10:57 -0600 From: Lina Iyer <ilina@...eaurora.org> To: Bjorn Andersson <bjorn.andersson@...aro.org> Cc: Marc Zyngier <marc.zyngier@....com>, swboyd@...omium.org, evgreen@...omium.org, linus.walleij@...aro.org, rplsssn@...eaurora.org, linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org, rnayak@...eaurora.org, devicetree@...r.kernel.org Subject: Re: [PATCH RESEND RFC 1/4] drivers: pinctrl: qcom: add wakeup capability to GPIO On Wed, Aug 01 2018 at 16:38 -0600, Bjorn Andersson wrote: >On Wed 01 Aug 12:45 PDT 2018, Lina Iyer wrote: > >> Thanks for the feedback, Marc. >> >> On Wed, Aug 01 2018 at 00:31 -0600, Marc Zyngier wrote: >> > On Wed, 01 Aug 2018 03:00:18 +0100, >> > Lina Iyer <ilina@...eaurora.org> wrote: >[..] >> > Why isn't that the case? And if that's because the HW is broken and >> > doesn't buffer edge interrupts, why can't you use the resend mechanism >> > instead? >> > >> The PDC hardware can replay the interrupts accurately. However, it will >> replay only the pin and its not the TLMM summary IRQ. The handler here, >> needs to notify the driver that the wakeup interrupt happened and needs >> to take action. If I could trip the summary IRQ in this handler that >> would work too. Can it be done? >> > >Does this means that the intr_status_reg will not hold the information >about the interrupt events that occurred before we powered on the TLMM >again? Or is the problem limited to it not triggering the TLMM IRQ? > It doesn't. The TLMM is in low power state and cannot sense interrupts. >Can the PDC (and MPM) be used in the non-sleep use cases as well? > Yes. We use PDC to modify polarity of falling edge and low level interrupts to rising edge and high level interrupt so they may be sensed at the GIC. I am not sure about the MPM. I suspect it is not. -- Lina
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