On Wednesday, January 17, 2018 11:19:17 AM CET Vinod Koul wrote:
> On Wed, Jan 17, 2018 at 10:38:28AM +0100, Geert Uytterhoeven wrote:
> > The current (empty) system sleep callbacks rely on the PM core to force
> > a runtime resume to reinitialize the DMAC registers during system
> > resume. Without a reinitialization, e.g. SCIF DMA will hang silently
> > after a system resume on R-Car Gen3.
> >
> > Make this explicit by using pm_runtime_force_{suspend,resume}() as the
> > system sleep callbacks instead. Use SET_LATE_SYSTEM_SLEEP_PM_OPS() as
> > DMA engines must be initialized before all DMA slave devices.
> >
> > Suggested-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
> > Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
> > ---
> > This is a dependency for "[PATCH 1/2] PM / genpd: Stop/start devices
> > without pm_runtime_force_suspend/resume()"
> > (https://www.spinics.net/lists/kernel/msg2696802.html), so perhaps it
> > makes most sense if Rafael takes it through the PM tree?
>
> Sounds okay to me.
>
> Acked-By: Vinod Koul <vinod.koul@xxxxxxxxx>
OK, so I'll take it.
Thanks!
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