linux-kernel - Re: [PATCH v2] dmaengine: fsl-edma: add PM suspend/resume support

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Message-ID: <CADRPPNQJi_x+mdQV=DEVuhCL_p6VOWcPiV3jzioeRdWgSW2w3g@mail.gmail.com>
Date:	Thu, 13 Aug 2015 15:58:01 -0500
From:	Li Yang <leoli@...escale.com>
To:	Yuan Yao <yao.yuan@...escale.com>
Cc:	Vinod Koul <vinod.koul@...el.com>, stefan@...er.ch,
	Arnd Bergmann <arnd@...db.de>,
	Dan Williams <dan.j.williams@...el.com>,
	dmaengine@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v2] dmaengine: fsl-edma: add PM suspend/resume support

On Tue, Jul 21, 2015 at 3:56 AM, Yuan Yao <yao.yuan@...escale.com> wrote:
> This add power management suspend/resume support for the fsl-edma
> driver.
>
> eDMA acted as a basic function used by others. What it needs to do is
> the two steps below to support power management.
>
> In fsl_edma_suspend_late:
> Check whether the DMA chan is idle and if it is not idle, stop PM
> operation.

You should try to quiesce the device on suspend instead of depending
on itself to be happen in idle and failing if it is not.

Regards,
Leo
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