linux-kernel - Re: [PATCH v4 8/8] DMA: Freescale: add suspend resume functions for DMA driver

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Message-ID: <536614E7.9050301@freescale.com>
Date:	Sun, 4 May 2014 18:22:31 +0800
From:	Hongbo Zhang <hongbo.zhang@...escale.com>
To:	Vinod Koul <vinod.koul@...el.com>
CC:	<vkoul@...radead.org>, <dan.j.williams@...el.com>,
	<dmaengine@...r.kernel.org>, <scottwood@...escale.com>,
	<leo.li@...escale.com>, <linuxppc-dev@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 8/8] DMA: Freescale: add suspend resume functions for
 DMA driver


On 05/03/2014 12:46 AM, Vinod Koul wrote:
> On Fri, Apr 18, 2014 at 04:17:51PM +0800, hongbo.zhang@...escale.com wrote:
>> From: Hongbo Zhang <hongbo.zhang@...escale.com>
>>
>> This patch adds suspend resume functions for Freescale DMA driver.
>> .prepare callback is used to stop further descriptors from being added into the
>> pending queue, and also issue pending queues into execution if there is any.
>> .suspend callback makes sure all the pending jobs are cleaned up and all the
>> channels are idle, and save the mode registers.
>> .resume callback re-initializes the channels by restore the mode registers.
>>
>> +
>> +static const struct dev_pm_ops fsldma_pm_ops = {
>> +	.prepare	= fsldma_prepare,
>> +	.suspend	= fsldma_suspend,
>> +	.resume		= fsldma_resume,
>> +};
> I think this is not correct. We discussed this sometime back on list. The
> DMAengine drivers should use late resume and early suspend to ensure they get
> suspended after clients (who should use normal ones) and resume before them
>
OK, will update it like this:
use .suspend to take place of current .prepare
use .suspend_late to take place of current .suspend
use .resume_early to take place of current .resume



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