linux-kernel - Re: [PATCH] ASoC: amd: correct pm

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Date:   Fri, 16 Jun 2023 18:28:29 +0530
From:   "kondaveeti, Arungopal" <arungopal.kondaveeti@....com>
To:     Mark Brown <broonie@...nel.org>
Cc:     alsa-devel@...a-project.org, vsujithkumar.reddy@....com,
        Vijendar.Mukunda@....com, Basavaraj.Hiregoudar@....com,
        Sunil-kumar.Dommati@....com, syed.sabakareem@....com,
        mastan.katragadda@....com, Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Mario Limonciello <mario.limonciello@....com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ASoC: amd: correct pm_runtime enable sequence



On 6/13/2023 7:39 PM, Mark Brown wrote:
> On Wed, Jun 14, 2023 at 06:01:59AM +0530, Arun Gopal Kondaveeti wrote:
>
>> Replace pm_runtime_allow() with pm_runtime_mark_last_busy()
>> & pm_runtime_set_active() in pm_runtime enable sequence for
>> dma drivers.
> This says what the change does but it doesn't say why the old sequence
> was a problem and the new one is better.

pm_runtime_allow is not needed for child platform drivers .

Previous sequence as listed below which is incorrect.

enable sequence:

     pm_runtime_set_autosuspend_delay(&pdev->dev, ACP_SUSPEND_DELAY_MS);
     pm_runtime_use_autosuspend(&pdev->dev);
     pm_runtime_enable(&pdev->dev);
     pm_runtime_allow(&pdev->dev);

disable sequence:

pm_runtime_disable(&pdev->dev)

Replaced pm runtime enable sequence.