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

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Date:   Tue, 29 May 2018 14:31:44 +0300
From:   Ramon Fried <ramon.fried@...il.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     linux-remoteproc@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] remoteproc: qcom_q6v5: don't auto boot remote processor

On Tue, May 29, 2018 at 7:20 AM, Bjorn Andersson
<bjorn.andersson@...aro.org> wrote:
> 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.
Yes. it was tested on 410, and it did the trick.
>
> 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
>>