linux-kernel - Re: [PATCH V1 1/1] soc: qcom: smp2p: Add wakeup capability to SMP2P IRQ

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Date:   Thu, 5 Aug 2021 12:40:09 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Deepak Kumar Singh <deesin@...eaurora.org>,
        bjorn.andersson@...aro.org, clew@...eaurora.org,
        sibis@...eaurora.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-remoteproc@...r.kernel.org, Andy Gross <agross@...nel.org>
Subject: Re: [PATCH V1 1/1] soc: qcom: smp2p: Add wakeup capability to SMP2P IRQ

Quoting Deepak Kumar Singh (2021-08-05 09:17:33)
> Some use cases require SMP2P interrupts to wake up the host
> from suspend.

Please elaborate on this point so we understand what sort of scenarios
want to wakeup from suspend.

> Mark smp2p interrupt as wakeup capable to abort
> the suspend.
>
> Signed-off-by: Deepak Kumar Singh <deesin@...eaurora.org>
> ---
>  drivers/soc/qcom/smp2p.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/drivers/soc/qcom/smp2p.c b/drivers/soc/qcom/smp2p.c
> index 2df4883..f8659b0 100644
> --- a/drivers/soc/qcom/smp2p.c
> +++ b/drivers/soc/qcom/smp2p.c
> @@ -18,6 +18,7 @@
>  #include <linux/soc/qcom/smem.h>
>  #include <linux/soc/qcom/smem_state.h>
>  #include <linux/spinlock.h>
> +#include <linux/pm_wakeirq.h>
>
>  /*
>   * The Shared Memory Point to Point (SMP2P) protocol facilitates communication
> @@ -538,9 +539,19 @@ static int qcom_smp2p_probe(struct platform_device *pdev)
>                 goto unwind_interfaces;
>         }
>
> +       ret = device_init_wakeup(&pdev->dev, true);

Is smp2p supposed to wake up the device by default? If not, then this
should be device_set_wakeup_capable() instead so that userspace can
decide if it wants to get the wakeup.

> +       if (ret)
> +               goto unwind_interfaces;
> +
> +       ret = dev_pm_set_wake_irq(&pdev->dev, irq);
> +       if (ret)
> +               goto set_wakeup_failed;

Otherwise this looks good to me.

>
>         return 0;
>
> +set_wakeup_failed:
> +       device_init_wakeup(&pdev->dev, false);
> +
>  unwind_interfaces:
>         list_for_each_entry(entry, &smp2p->inbound, node)
>                 irq_domain_remove(entry->domain);