linux-kernel - Re: [PATCH] remoteproc: qcom_q6v5: don't auto boot remote processor

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Date:   Mon, 28 May 2018 21:20:47 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Ramon Fried <ramon.fried@...il.com>
Cc:     linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] remoteproc: qcom_q6v5: don't auto boot remote processor

On Thu 24 May 12:21 PDT 2018, Ramon Fried wrote:

> Sometimes that rmtfs userspace module is not brought
> up fast enough and the modem crashes.
> disabling automated boot in the driver and triggering
> the boot from user-space sovles the problem.
> 
> Signed-off-by: Ramon Fried <ramon.fried@...il.com>

Thanks for your patch Ramon. While this nudges the behavior to make
things work slightly better I think we need to describe the explicit
dependency between the mss firmware and the existence of rmtfs.

As our remoteprocs are essentially always-on I would prefer that they
start "automatically" and not through use of the sysfs interface.

But we're at the point where this is a real problem on 410, 820 and 845,
so we have to come up with some way to tie these pieces together. If
your patch suits that solution I will happily take it.

Regards,
Bjorn

> ---
>  drivers/remoteproc/qcom_q6v5_pil.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/remoteproc/qcom_q6v5_pil.c b/drivers/remoteproc/qcom_q6v5_pil.c
> index cbbafdcaaecb..719ee96445b3 100644
> --- a/drivers/remoteproc/qcom_q6v5_pil.c
> +++ b/drivers/remoteproc/qcom_q6v5_pil.c
> @@ -1133,6 +1133,8 @@ static int q6v5_probe(struct platform_device *pdev)
>  		return -ENOMEM;
>  	}
>  
> +	rproc->auto_boot = false;
> +
>  	qproc = (struct q6v5 *)rproc->priv;
>  	qproc->dev = &pdev->dev;
>  	qproc->rproc = rproc;
> -- 
> 2.17.0
>