Re: [PATCH 2/2] mfd: intel-lpss: Avoid resuming runtime-suspended lpss unnecessarily

From: Oliver Neukum
Date: Wed Sep 28 2016 - 03:43:11 EST

On Wed, 2016-09-28 at 11:28 +0800, Chen Yu wrote:
> So first try is to use pm_request_resume() instead, to make the
> runtime
> resume process asynchronously. Unfortunately the asynchronous runtime
> resume relies on pm_wq, which is freezed at early stage. So we choose
> another method, that is to avoid resuming runtime-suspended devices,
> if they are already runtime suspended. This is safe because for LPSS
> driver, the runtime suspend and system suspend are of the same
> hook - i.e., intel_lpss_suspend(). And moreover, this device is
> neither runtime wakeup source nor system wakeup source.

I agree with the reasoning but I don't see the specificity to LPSS.
Shouldn't this go into the core?