linux-kernel - Re: [PATCH v2 3/5] venus: add check to make scm calls

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Date:   Fri, 22 Jun 2018 16:19:34 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Tomasz Figa <tfiga@...omium.org>
Cc:     vgarodia@...eaurora.org, Hans Verkuil <hverkuil@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Mark Rutland <mark.rutland@....com>, andy.gross@...aro.org,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        linux-soc@...r.kernel.org, devicetree@...r.kernel.org,
        Alexandre Courbot <acourbot@...omium.org>
Subject: Re: [PATCH v2 3/5] venus: add check to make scm calls

On Mon 04 Jun 05:58 PDT 2018, Tomasz Figa wrote:

> Hi Vikash,
> 
> On Sat, Jun 2, 2018 at 5:27 AM Vikash Garodia <vgarodia@...eaurora.org> wrote:
> [snip]
> > +int venus_boot(struct venus_core *core)
> > +{
> > +       phys_addr_t mem_phys;
> > +       size_t mem_size;
> > +       int ret;
> > +       struct device *dev;
> > +
> > +       if (!IS_ENABLED(CONFIG_QCOM_MDT_LOADER))
> > +               return -EPROBE_DEFER;
> 
> Why are we deferring probe here? The option will not magically become
> enabled after probe is retried.
> 

The original code should have read:

	if (IS_ENABLED(CONFIG_QCOM_MDT_LOADER) && !qcom_scm_is_available())
		return -EPROBE_DEFER;

The code does depend on CONFIG_QCOM_MDT_LOADER regardless of it using
scm for firmware verification.

Regards,
Bjorn