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SubjectRe: [PATCH 2/2] dmaengine: fsl-edma: add PM suspend/resume support
On Tue, Dec 30, 2014 at 04:41:47PM +0800, Jingchang Lu wrote:
> 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);
Wouldnt this be reconfigured? Should you do this for all channels or active
ones.
Also I dont see you pausing or suspending active channels or checking for
them?

--
~Vinod

> + }
> +
> + 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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