linux-kernel - Re: [PATCH v2 2/2] remoteproc: core: Prevent sleep when rproc crashes

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Date:   Fri, 10 Apr 2020 19:26:27 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Siddharth Gupta <sidgup@...eaurora.org>
Cc:     ohad@...ery.com, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, tsoni@...eaurora.org,
        psodagud@...eaurora.org, rishabhb@...eaurora.org
Subject: Re: [PATCH v2 2/2] remoteproc: core: Prevent sleep when rproc crashes

On Wed 08 Apr 15:18 PDT 2020, Siddharth Gupta wrote:

> Remoteproc recovery should be fast and any delay will have an impact on the
> user-experience. Add a wakeup source to remoteproc which ensures that the
> system does not go into idle state while a remoteproc is recovering, thus
> prevent any delays that might occur during system resume.
> 

This is better, but I think it can be reworded further to show that it's
not a matter of making it "fast", it's a matter of preventing suspend
from interrupting the recovery of a remoteproc.

> Signed-off-by: Siddharth Gupta <sidgup@...eaurora.org>
> ---
>  drivers/remoteproc/qcom_q6v5_pas.c   | 1 +
>  drivers/remoteproc/remoteproc_core.c | 4 ++++
>  2 files changed, 5 insertions(+)
> 
> diff --git a/drivers/remoteproc/qcom_q6v5_pas.c b/drivers/remoteproc/qcom_q6v5_pas.c
> index 7a63efb..6bb2c7d 100644
> --- a/drivers/remoteproc/qcom_q6v5_pas.c
> +++ b/drivers/remoteproc/qcom_q6v5_pas.c
> @@ -401,6 +401,7 @@ static int adsp_probe(struct platform_device *pdev)
>  
>  	adsp = (struct qcom_adsp *)rproc->priv;
>  	adsp->dev = &pdev->dev;
> +	device_wakeup_enable(adsp->dev);

Move this 5 lines down and give it an empty line before and after.

>  	adsp->rproc = rproc;
>  	adsp->pas_id = desc->pas_id;
>  	adsp->has_aggre2_clk = desc->has_aggre2_clk;
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 9f99fe2..19a360d 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -1729,6 +1729,8 @@ static void rproc_crash_handler_work(struct work_struct *work)
>  
>  	if (!rproc->recovery_disabled)
>  		rproc_trigger_recovery(rproc);
> +
> +	pm_relax(rproc->dev.parent);
>  }
>  
>  /**
> @@ -2273,6 +2275,8 @@ void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type)
>  		return;
>  	}
>  

	/* Prevent suspend while the remoteproc is being recovered */


PS. This patch is unrelated to patch 1/2, so please resubmit it
separately.

Regards,
Bjorn

> +	pm_stay_awake(rproc->dev.parent);
> +
>  	dev_err(&rproc->dev, "crash detected in %s: type %s\n",
>  		rproc->name, rproc_crash_to_string(type));
>  
> -- 
> Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project