On Thu, Oct 22, 2015 at 10:54 PM, Han Xu <b45815@xxxxxxxxxxxxx> wrote:
> From: Huang Shijie <b32955@xxxxxxxxxxxxx>
>
> 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@xxxxxxxxxxxxx>
> Signed-off-by: Han Xu <b45815@xxxxxxxxxxxxx>
> ---
> 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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