Messages in this thread Patch in this message | | | From | Han Xu <> | Subject | [PATCH v8 2/7] dmaengine: mxs: APBH DMA supports deep sleep mode | Date | Wed, 2 Dec 2015 16:47:41 -0600 |
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From: Huang Shijie <b32955@freescale.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@freescale.com> Signed-off-by: Han Xu <b45815@freescale.com> --- drivers/dma/mxs-dma.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c index 60de352..eba51fc 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 +873,23 @@ static int __init mxs_dma_probe(struct platform_device *pdev) return 0; } +#ifdef CONFIG_PM_SLEEP +static int mxs_dma_pm_resume(struct device *dev) +{ + struct mxs_dma_engine *mxs_dma = dev_get_drvdata(dev); + + return mxs_dma_init(mxs_dma); +} +#endif /* CONFIG_PM_SLEEP */ + +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, -- 1.9.1
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