linux-kernel - Re: [PATCH v6 2/7] dmaengine: mxs: APBH DMA supports deep sleep mode

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Date:	Thu, 29 Oct 2015 23:10:07 +0200
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Han Xu <b45815@...escale.com>
Cc:	shijie.huang@....com, David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	boris.brezillon@...e-electrons.com, fabio.estevam@...escale.com,
	hofrat@...dl.org,
	"open list:MEMORY TECHNOLOGY..." <linux-mtd@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	dmaengine <dmaengine@...r.kernel.org>
Subject: Re: [PATCH v6 2/7] dmaengine: mxs: APBH DMA supports deep sleep mode

On Thu, Oct 22, 2015 at 10:54 PM, Han Xu <b45815@...escale.com> wrote:
> From: Huang Shijie <b32955@...escale.com>
>
> Deep Sleep Mode(dsm) turns off the power for APBH DMA module, DMA
> need to be re-initialized when system resumed back.
>
> Signed-off-by: Huang Shijie <b32955@...escale.com>
> Signed-off-by: Han Xu <b45815@...escale.com>
> ---
>  drivers/dma/mxs-dma.c | 19 ++++++++++++++++++-
>  1 file changed, 18 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c
> index 60de352..7e5800a 100644
> --- a/drivers/dma/mxs-dma.c
> +++ b/drivers/dma/mxs-dma.c
> @@ -693,7 +693,7 @@ static enum dma_status mxs_dma_tx_status(struct dma_chan *chan,
>         return mxs_chan->status;
>  }
>
> -static int __init mxs_dma_init(struct mxs_dma_engine *mxs_dma)
> +static int mxs_dma_init(struct mxs_dma_engine *mxs_dma)
>  {
>         int ret;
>
> @@ -835,6 +835,7 @@ static int __init mxs_dma_probe(struct platform_device *pdev)
>
>         mxs_dma->pdev = pdev;
>         mxs_dma->dma_device.dev = &pdev->dev;
> +       dev_set_drvdata(&pdev->dev, mxs_dma);
>
>         /* mxs_dma gets 65535 bytes maximum sg size */
>         mxs_dma->dma_device.dev->dma_parms = &mxs_dma->dma_parms;
> @@ -872,9 +873,25 @@ static int __init mxs_dma_probe(struct platform_device *pdev)
>         return 0;
>  }
>
> +static int mxs_dma_pm_resume(struct device *dev)
> +{
> +       struct mxs_dma_engine *mxs_dma = dev_get_drvdata(dev);


> +       int ret;
> +
> +       ret = mxs_dma_init(mxs_dma);
> +       if (ret)
> +               return ret;
> +       return 0;

Just
return mxs_dma_init(mxs_dma);

> +}
> +
> +static const struct dev_pm_ops mxs_dma_pm_ops = {
> +       SET_SYSTEM_SLEEP_PM_OPS(NULL, mxs_dma_pm_resume)
> +};
> +
>  static struct platform_driver mxs_dma_driver = {
>         .driver         = {
>                 .name   = "mxs-dma",
> +               .pm = &mxs_dma_pm_ops,
>                 .of_match_table = mxs_dma_dt_ids,
>         },
>         .id_table       = mxs_dma_ids,



-- 
With Best Regards,
Andy Shevchenko
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