[linux-pm] [PATCH] i2c: OMAP: fix static suspend vs. runtime suspend
stern at rowland.harvard.edu
Mon Jan 31 10:13:13 EST 2011
On Mon, 31 Jan 2011, Rajendra Nayak wrote:
> Can you elaborate a bit more on how/why runtime PM transitions
> are disabled during system suspend, and how is it taken care
> of that a runtime resume of a device works however a subsequent
> runtime (re)suspend does not?
I'll answer for Kevin. This is done by the PM core, in order to
prevent runtime power transitions from interfering with a system power
transition. The PM core increments the device's usage_count; this
prevents the device from being runtime-suspended but it allows
runtime-resume calls to go through.
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