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Date: Tue, 11 Sep 2012 15:15:07 +1000 From: Dave Airlie <airlied@...il.com> To: "Rafael J. Wysocki" <rjw@...k.pl>, LKML <linux-kernel@...r.kernel.org>, dri-devel <dri-devel@...ts.freedesktop.org> Subject: runtime PM and special power switches Hi Rafael, I've been investigating runtime PM support for some use-cases on GPUs. In some laptops we have a secondary GPU (optimus) that can be powered up for certain 3D tasks and then turned off when finished with. Now I did an initial pass on supporting it without using the kernel runtime PM stuff, but Alan said I should take a look so here I am. While I've started to get a handle on things, we have a bit of an extra that I'm not sure we cater for. Currently we get called from the PCI layer which after we are finished with our runtime suspend callback, will go put the device into the correct state etc, however on these optimus/powerxpress laptops we have a separate ACPI or platform driver controlled power switch that we need to call once the PCI layer is finished the job. This switch effectively turns the power to the card completely off leaving it drawing no power. No we can't hit the switch from the driver callback as the PCI layer will get lost, so I'm wondering how you'd envisage we could plug this in. Dave. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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