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Subject[PATCH 2/2] dmaengine: fsl-edma: add PM suspend/resume support
Date
This adds power management suspend/resume support for
the fsl-edma driver.

Signed-off-by: Jingchang Lu <jingchang.lu@freescale.com>
---
drivers/dma/fsl-edma.c | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)

diff --git a/drivers/dma/fsl-edma.c b/drivers/dma/fsl-edma.c
index e0bd517..6a81699 100644
--- a/drivers/dma/fsl-edma.c
+++ b/drivers/dma/fsl-edma.c
@@ -1017,6 +1017,43 @@ static int fsl_edma_remove(struct platform_device *pdev)
return 0;
}

+#ifdef CONFIG_PM_SLEEP
+static int fsl_edma_pm_suspend(struct device *dev)
+{
+ struct fsl_edma_engine *fsl_edma = dev_get_drvdata(dev);
+ struct fsl_edma_chan *fsl_chan;
+ int i;
+
+ for (i = 0; i < fsl_edma->n_chans; i++) {
+ fsl_chan = &fsl_edma->chans[i];
+ fsl_edma_chan_mux(fsl_chan, 0, false);
+ }
+
+ return 0;
+}
+
+static int fsl_edma_pm_resume(struct device *dev)
+{
+ struct fsl_edma_engine *fsl_edma = dev_get_drvdata(dev);
+ struct fsl_edma_chan *fsl_chan;
+ int i;
+
+ for (i = 0; i < fsl_edma->n_chans; i++) {
+ fsl_chan = &fsl_edma->chans[i];
+ edma_writew(fsl_edma, 0x0, fsl_edma->membase + EDMA_TCD_CSR(i));
+ /* restore the channel slave id configuration */
+ fsl_edma_chan_mux(fsl_chan, fsl_chan->slave_id, true);
+ }
+
+ edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA,
+ fsl_edma->membase + EDMA_CR);
+
+ return 0;
+}
+#endif
+static
+SIMPLE_DEV_PM_OPS(fsl_edma_pm_ops, fsl_edma_pm_suspend, fsl_edma_pm_resume);
+
static const struct of_device_id fsl_edma_dt_ids[] = {
{ .compatible = "fsl,vf610-edma", },
{ /* sentinel */ }
@@ -1027,6 +1064,7 @@ static struct platform_driver fsl_edma_driver = {
.driver = {
.name = "fsl-edma",
.of_match_table = fsl_edma_dt_ids,
+ .pm = &fsl_edma_pm_ops,
},
.probe = fsl_edma_probe,
.remove = fsl_edma_remove,
--
1.8.0


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