linux-kernel - Re: [PATCH v2 6/9] ASoC: tegra: add Tegra186 based DSPK driver

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Message-ID: <75a63cb3-7d79-7216-6791-3cec57464cd9@nvidia.com>
Date:   Fri, 7 Feb 2020 16:56:55 +0530
From:   Sameer Pujar <spujar@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>
CC:     <spujar@...dia.com>, <perex@...ex.cz>, <tiwai@...e.com>,
        <robh+dt@...nel.org>, <broonie@...nel.org>, <lgirdwood@...il.com>,
        <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <alsa-devel@...a-project.org>, <devicetree@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <sharadg@...dia.com>, <mkumard@...dia.com>,
        <viswanathl@...dia.com>, <rlokhande@...dia.com>,
        <dramesh@...dia.com>, <atalambedu@...dia.com>
Subject: Re: [PATCH v2 6/9] ASoC: tegra: add Tegra186 based DSPK driver



On 2/6/2020 10:45 PM, Dmitry Osipenko wrote:
> External email: Use caution opening links or attachments
>
>
> 30.01.2020 13:33, Sameer Pujar пишет:
>> +static const struct dev_pm_ops tegra186_dspk_pm_ops = {
>> +     SET_RUNTIME_PM_OPS(tegra186_dspk_runtime_suspend,
>> +                        tegra186_dspk_runtime_resume, NULL)
>> +     SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
>> +                                  pm_runtime_force_resume)
>> +};
> Could you please explain why drivers need the "late" system sleep?

It was done to ensure core drivers are suspended first and defer the 
codec driver suspend