linux-kernel - Re: [PATCH] remoteproc: qcom: q6v5-pil: add SCM probe dependency

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Message-ID: <20181009062125.GA2518@tuxbook-pro>
Date:   Mon, 8 Oct 2018 23:21:25 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Sibi Sankar <sibis@...eaurora.org>,
        Brian Norris <briannorris@...omium.org>
Cc:     Ohad Ben-Cohen <ohad@...ery.com>, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-soc@...r.kernel.org
Subject: Re: [PATCH] remoteproc: qcom: q6v5-pil: add SCM probe dependency

On Mon 08 Oct 19:08 PDT 2018, Brian Norris wrote:

> Similar to qcom_q6v5_pas and qcom_wcnss drivers, probe will fail if SCM
> is not up.
> 

Thanks Brian, this dependency was introduced with the memory ownership
support.

I applied it with an updated conditional to make it explicit that it
related to need_mem_protection, updated the commit message to describe
actual relationship to the memory protection mechanism and added a
Fixes: tag.


Don't we also need to add the ability to disable need_mem_protection
when we're running ATF?

Regards,
Bjorn

> Signed-off-by: Brian Norris <briannorris@...omium.org>
> ---
>  drivers/remoteproc/qcom_q6v5_mss.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
> index a839b07a58b1..8836ca1bc0c1 100644
> --- a/drivers/remoteproc/qcom_q6v5_mss.c
> +++ b/drivers/remoteproc/qcom_q6v5_mss.c
> @@ -1151,6 +1151,9 @@ static int q6v5_probe(struct platform_device *pdev)
>  	if (!desc)
>  		return -EINVAL;
>  
> +	if (!qcom_scm_is_available())
> +		return -EPROBE_DEFER;
> +
>  	rproc = rproc_alloc(&pdev->dev, pdev->name, &q6v5_ops,
>  			    desc->hexagon_mba_image, sizeof(*qproc));
>  	if (!rproc) {