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Date:   Mon, 21 Feb 2022 23:10:37 +0300
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Subject: Re: [PATCH v3 8/9] drm/tegra: vic: Implement get_streamid_offset
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To:     Mikko Perttunen <cyndis@kapsi.fi>,
        Mikko Perttunen <mperttunen@nvidia.com>,
        thierry.reding@gmail.com, jonathanh@nvidia.com, joro@8bytes.org,
        will@kernel.org, robh+dt@kernel.org, robin.murphy@arm.com
Cc:     linux-tegra@vger.kernel.org, dri-devel@lists.freedesktop.org,
        iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org
References: <20220218113952.3077606-1-mperttunen@nvidia.com>
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 <7f4e4c47-59f1-1def-36bf-a2ded912f76d@gmail.com>
 <5d1b6e82-2c9d-8388-697f-0d7305a1206f@kapsi.fi>
From:   Dmitry Osipenko <digetx@gmail.com>
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21.02.2022 14:44, Mikko Perttunen пишет:
> On 2/19/22 20:54, Dmitry Osipenko wrote:
>> 19.02.2022 21:49, Dmitry Osipenko пишет:
>>> 18.02.2022 14:39, Mikko Perttunen пишет:
>>>> +static int vic_get_streamid_offset(struct tegra_drm_client *client)
>>>> +{
>>>> +    struct vic *vic = to_vic(client);
>>>> +    int err;
>>>> +
>>>> +    err = vic_load_firmware(vic);
>>>
>>> You can't invoke vic_load_firmware() while RPM is suspended. Either
>>> replace this with RPM get/put or do something else.
> 
> Why not, I'm not seeing any HW accesses in vic_load_firmware? Although
> it looks like it might race with the vic_load_firmware call in
> vic_runtime_resume which probably needs to be fixed.

It was not clear from the function's name that h/w is untouched, I read
"load" as "upload" and then looked at vic_runtime_resume(). I'd rename
vic_load_firmware() to vic_prepare_firmware_image().

And yes, technically lock is needed.