From: "S.j. Wang" <shengjiu.wang@nxp.com>
To: Mark Brown <broonie@kernel.org>
Cc: "alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>,
"timur@kernel.org" <timur@kernel.org>,
"Xiubo.Lee@gmail.com" <Xiubo.Lee@gmail.com>,
"festevam@gmail.com" <festevam@gmail.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Nicolin Chen <nicoleotsuka@gmail.com>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>
Subject: Re: [PATCH] ASoC: fsl_esai: Add pm runtime function
Date: Thu, 18 Apr 2019 11:12:45 +0000 [thread overview]
Message-ID: <VE1PR04MB6479999444FBBCF81E37E630E3260@VE1PR04MB6479.eurprd04.prod.outlook.com> (raw)
Hi
> On Thu, Apr 18, 2019 at 10:15:24AM +0000, S.j. Wang wrote:
> > > 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:
>
> > > > 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.
>
> > There is limitation in our internal design. That is in imx8 the power
> > of subsystem will be disabled at suspend, include the clock state , clock
> rate.
>
> Right, that's fairly normal but usually it'd be restored as part of the resume
> process?
>
> > This patch is to enable the pm runtime, so I think it is better to
> > move the clock operation to pm runtime, and close the clock at
> > suspend to reduce the power.
>
> It's definitely good to turn the clock off as much as possible, yes.
Thanks, will send v2.
Best regards
Wang shengjiu
next reply other threads:[~2019-04-18 11:28 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-18 11:12 S.j. Wang [this message]
-- strict thread matches above, loose matches on Subject: below --
2019-04-18 10:21 [PATCH] ASoC: fsl_esai: Add pm runtime function S.j. Wang
2019-04-18 10:15 S.j. Wang
2019-04-18 10:17 ` Mark Brown
2019-04-18 3:29 S.j. Wang
2019-04-18 9:00 ` Nicolin Chen
2019-04-18 9:06 ` Mark Brown
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