> -----Original Message----- > From: Alan Stern [mailto:st...@rowland.harvard.edu] > Sent: Monday, January 31, 2011 8:43 PM > To: Rajendra Nayak > Cc: Kevin Hilman; Ben Dooks; linux-...@vger.kernel.org; linux...@lists.linux-foundation.org; linux- > o...@vger.kernel.org; linux-arm-ker...@lists.infradead.org > Subject: Re: [linux-pm] [PATCH] i2c: OMAP: fix static suspend vs. runtime suspend > > 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.
Thanks, I did remember seeing the pm_runtime_get_noresume() in dpm_prepare(). Just did not correlate it was the same Kevin was trying to say. Regards, Rajendra > > Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
