On Sun, Sep 22, 2013 at 04:50:04PM +0200, Daniel Mack wrote:
> This patch adds support for suspend/resume functionality to the cppi41
> DMA driver. The steps necessary to make the system resume properly were
> figured out by trial-and-error. The code as it stands now is the
> minimum that has to be done to put the musb host system on an AM33xx
> system into an operable state after resume.
>
> Signed-off-by: Daniel Mack <zonque@xxxxxxxxx>
> ---
> drivers/dma/cppi41.c | 29 +++++++++++++++++++++++++++++
> 1 file changed, 29 insertions(+)
>
> diff --git a/drivers/dma/cppi41.c b/drivers/dma/cppi41.c
> index 3347321..89decc9 100644
> --- a/drivers/dma/cppi41.c
> +++ b/drivers/dma/cppi41.c
> @@ -1040,12 +1040,41 @@ static int cppi41_dma_remove(struct platform_device *pdev)
> return 0;
> }
>
> +#ifdef CONFIG_PM_SLEEP
ahhhh
> +static int cppi41_suspend(struct device *dev)
> +{
> + struct cppi41_dd *cdd = dev_get_drvdata(dev);
> +
> + cppi_writel(0, cdd->usbss_mem + USBSS_IRQ_CLEARR);
> + disable_sched(cdd);
> +
> + return 0;
> +}
> +
> +static int cppi41_resume(struct device *dev)
> +{
> + struct cppi41_dd *cdd = dev_get_drvdata(dev);
> + int i;
> +
> + for (i = 0; i < DESCS_AREAS; i++)
> + cppi_writel(cdd->descs_phys, cdd->qmgr_mem + QMGR_MEMBASE(i));
> +
> + init_sched(cdd);
> + cppi_writel(USBSS_IRQ_PD_COMP, cdd->usbss_mem + USBSS_IRQ_ENABLER);
> +
> + return 0;
> +}
> +#endif
> +
> +static SIMPLE_DEV_PM_OPS(cppi41_pm_ops, cppi41_suspend, cppi41_resume);
Here is the macro in pm.h
#ifdef CONFIG_PM_SLEEP
#define SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
.suspend = suspend_fn, \
.resume = resume_fn, \
.freeze = suspend_fn, \
.thaw = resume_fn, \
.poweroff = suspend_fn, \
.restore = resume_fn,
#else
#define SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
#endif
/*
* Use this if you want to use the same suspend and resume callbacks for suspend
* to RAM and hibernation.
*/
#define SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn) \
const struct dev_pm_ops name = { \
SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
Now since you are using the macro there should be no need to wrap ifdef around
your code, the macro will take care of it.
~Vinod
> +
> static struct platform_driver cpp41_dma_driver = {
> .probe = cppi41_dma_probe,
> .remove = cppi41_dma_remove,
> .driver = {
> .name = "cppi41-dma-engine",
> .owner = THIS_MODULE,
> + .pm = &cppi41_pm_ops,
> .of_match_table = of_match_ptr(cppi41_dma_ids),
> },
> };
> --
> 1.8.3.1
>
--
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