On Mon, Mar 05, 2012 at 07:48:42PM +0900, Jaehoon Chung wrote:
> On 03/03/2012 09:46 AM, Mark Brown wrote:

> > +	pm_runtime_set_autosuspend_delay(&pdev->dev, 50);

> Could you explain why use 50ms? 

It's essentially a random number, some other devices use the same one.
We're just trying to avoid suspending between back to back requests.

> > +	pm_runtime_use_autosuspend(&pdev->dev);
> > +	pm_suspend_ignore_children(&pdev->dev, 1);

> Is there reason that ignore_children use to set the true?

So that we can suspend the host without having to have the MMC card
suspended (the host suspend is not visible to the card).