linux-kernel - Re: [PATCH v7 3/7] dmaengine: mxs: add i.MX7D APBH DMA support

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Message-ID: <CAHp75Vf3OddaGgwrOyk0EE46oFmjoRt+rj3su2VBJQwUnGdRAw@mail.gmail.com>
Date:	Thu, 29 Oct 2015 23:08:10 +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 v7 3/7] dmaengine: mxs: add i.MX7D APBH DMA support

On Wed, Oct 28, 2015 at 12:05 AM, Han Xu <b45815@...escale.com> wrote:
> From: Adrian Alonso <aalonso@...escale.com>
>
> supports APBH DMA on i.MX7D by add extra clock clk_io

[]

>  MODULE_DEVICE_TABLE(of, mxs_dma_dt_ids);
> @@ -440,6 +448,13 @@ static int mxs_dma_alloc_chan_resources(struct dma_chan *chan)
>         if (ret)
>                 goto err_clk;
>
> +       /* enable the extra clk_io clock for i.MX7D */
> +       if (mxs_dma->dev_id == IMX7D_DMA) {
> +               ret = clk_prepare_enable(mxs_dma->clk_io);
> +               if (ret)
> +                       goto err_clk_unprepare;

Perhaps err_clk.

> +       }
> +
>         mxs_dma_reset_chan(chan);
>
>         dma_async_tx_descriptor_init(&mxs_chan->desc, chan);
> @@ -450,6 +465,8 @@ static int mxs_dma_alloc_chan_resources(struct dma_chan *chan)
>
>         return 0;
>
> +err_clk_unprepare:
> +       clk_disable_unprepare(mxs_dma->clk);
>  err_clk:
>         free_irq(mxs_chan->chan_irq, mxs_dma);
>  err_irq:
> @@ -471,6 +488,9 @@ static void mxs_dma_free_chan_resources(struct dma_chan *chan)
>         dma_free_coherent(mxs_dma->dma_device.dev, CCW_BLOCK_SIZE,
>                         mxs_chan->ccw, mxs_chan->ccw_phys);
>
> +       if (mxs_dma->dev_id == IMX7D_DMA)
> +               clk_disable_unprepare(mxs_dma->clk_io);
> +
>         clk_disable_unprepare(mxs_dma->clk);
>  }
>
> @@ -701,9 +721,15 @@ static int mxs_dma_init(struct mxs_dma_engine *mxs_dma)
>         if (ret)
>                 return ret;
>
> +       if (mxs_dma->dev_id == IMX7D_DMA) {
> +               ret = clk_prepare_enable(mxs_dma->clk_io);
> +               if (ret)
> +                       goto err_clk_bch;
> +       }
> +
>         ret = stmp_reset_block(mxs_dma->base);
>         if (ret)
> -               goto err_out;
> +               goto err_clk_io;
>
>         /* enable apbh burst */
>         if (dma_is_apbh(mxs_dma)) {
> @@ -717,7 +743,10 @@ static int mxs_dma_init(struct mxs_dma_engine *mxs_dma)
>         writel(MXS_DMA_CHANNELS_MASK << MXS_DMA_CHANNELS,
>                 mxs_dma->base + HW_APBHX_CTRL1 + STMP_OFFSET_REG_SET);
>
> -err_out:
> +err_clk_io:
> +       if (mxs_dma->dev_id == IMX7D_DMA)
> +               clk_disable_unprepare(mxs_dma->clk_io);
> +err_clk_bch:
>         clk_disable_unprepare(mxs_dma->clk);
>         return ret;
>  }
> @@ -803,9 +832,19 @@ static int __init mxs_dma_probe(struct platform_device *pdev)
>         if (IS_ERR(mxs_dma->base))
>                 return PTR_ERR(mxs_dma->base);
>
> -       mxs_dma->clk = devm_clk_get(&pdev->dev, NULL);
> -       if (IS_ERR(mxs_dma->clk))
> -               return PTR_ERR(mxs_dma->clk);
> +       if (mxs_dma->dev_id == IMX7D_DMA) {
> +               mxs_dma->clk = devm_clk_get(&pdev->dev, "dma_apbh_bch");
> +               if (IS_ERR(mxs_dma->clk))
> +                       return PTR_ERR(mxs_dma->clk);
> +               mxs_dma->clk_io = devm_clk_get(&pdev->dev, "dma_apbh_io");
> +               if (IS_ERR(mxs_dma->clk_io))
> +                       return PTR_ERR(mxs_dma->clk_io);
> +

Redundant empty line.

> +       } else {
> +               mxs_dma->clk = devm_clk_get(&pdev->dev, NULL);
> +               if (IS_ERR(mxs_dma->clk))
> +                       return PTR_ERR(mxs_dma->clk);
> +       }



-- 
With Best Regards,
Andy Shevchenko
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