linux-kernel - Re: [PATCH v3 2/6] dmaengine: mxs: support i.MX7D and deep sleep mode

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Date:	Mon, 21 Sep 2015 22:32:38 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Han Xu <b45815@...escale.com>
Cc:	shijie.huang@....com, dwmw2@...radead.org,
	computersforpeace@...il.com, boris.brezillon@...e-electrons.com,
	fabio.estevam@...escale.com, hofrat@...dl.org,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
	dan.j.williams@...el.com, dmaengine@...r.kernel.org
Subject: Re: [PATCH v3 2/6] dmaengine: mxs: support i.MX7D and deep sleep mode

On Fri, Aug 28, 2015 at 02:32:41PM -0500, Han Xu wrote:
> @@ -28,7 +28,6 @@
>  #include <linux/of_device.h>
>  #include <linux/of_dma.h>
>  #include <linux/list.h>
> -

Pl dont change at random places

> +	if (mxs_dma->dev_id == IMX7D_DMA) {
> +		ret = clk_prepare_enable(mxs_dma->clk_io);
> +		if (ret)
> +			goto err_clk_unprepare;
> +	}
> +
>  	mxs_dma_reset_chan(chan);
>  
>  	dma_async_tx_descriptor_init(&mxs_chan->desc, chan);
> @@ -450,6 +464,8 @@ static int mxs_dma_alloc_chan_resources(struct dma_chan *chan)
>  
>  	return 0;
>  
> +err_clk_unprepare:
> +	clk_disable_unprepare(mxs_dma->clk);

and this doesn't look right. You are calling this for failure on
clk_prepare_enable() so if clock prepare failed you are still going to
disable and unprepare??

> -static int __init mxs_dma_init(struct mxs_dma_engine *mxs_dma)
> +static int mxs_dma_init(struct mxs_dma_engine *mxs_dma)

this should be separate change explaining why

> +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;

Aren't you supposed to prepare and unprepare clock in PM handlers too?

-- 
~Vinod
--
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