From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-bl2on0104.outbound.protection.outlook.com ([65.55.169.104] helo=na01-bl2-obe.outbound.protection.outlook.com) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZpM7b-0003Va-Rf for linux-mtd@lists.infradead.org; Thu, 22 Oct 2015 20:06:02 +0000 From: Han Xu To: CC: , , , , , , , , , , Subject: [PATCH v6 2/7] dmaengine: mxs: APBH DMA supports deep sleep mode Date: Thu, 22 Oct 2015 14:54:31 -0500 Message-ID: <1445543676-19876-3-git-send-email-b45815@freescale.com> In-Reply-To: <1445543676-19876-1-git-send-email-b45815@freescale.com> References: <1445543676-19876-1-git-send-email-b45815@freescale.com> MIME-Version: 1.0 Content-Type: text/plain List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Huang Shijie 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 Signed-off-by: Han Xu --- 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; +} + +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