linux-kernel - Re: [PATCH] ASoC: fsl_esai: Add pm runtime function

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Message-ID: <20190418090638.GA6702@sirena.org.uk>
Date:   Thu, 18 Apr 2019 10:06:38 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Nicolin Chen <nicoleotsuka@...il.com>
Cc:     "S.j. Wang" <shengjiu.wang@....com>,
        "timur@...nel.org" <timur@...nel.org>,
        "Xiubo.Lee@...il.com" <Xiubo.Lee@...il.com>,
        "festevam@...il.com" <festevam@...il.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ASoC: fsl_esai: Add pm runtime function

On Thu, Apr 18, 2019 at 02:00:12AM -0700, Nicolin Chen wrote:
> On Thu, Apr 18, 2019 at 03:29:09AM +0000, S.j. Wang wrote:

> > In imx8 when systerm enter suspend state, the power of subsystem will
> > be off, the clock enable state will be lost and register configuration

> Just for curiosity, we had similar situation on imx6sx, so we
> added suspend/resume with regcache. Why will the clock enable
> state be lost too? Does CCM on imx8 (might not be called CCM
> though) have any difference? What about clock rate settings?

That sounds like a bug somewhere else - I'd expect that after resume the
clocking would be restored to the state it was in before suspend.

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