On Thu, Oct 29, 2015 at 11:08:10PM +0200, Andy Shevchenko wrote:
> On Wed, Oct 28, 2015 at 12:05 AM, Han Xu <b45815@xxxxxxxxxxxxx> wrote:
> > From: Adrian Alonso <aalonso@xxxxxxxxxxxxx>
> >
> > supports APBH DMA on i.MX7D by add extra clock clk_io
>
> []
>
any comments here?
> > 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
--
Best Regards,
Han "Allen" Xu
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