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authorPeter Wu <peter@lekensteyn.nl>2016-07-15 15:12:18 +0200
committerBen Skeggs <bskeggs@redhat.com>2016-07-30 18:19:48 +1000
commit692a17dcc2922a91c6bcf11b3321503a3377b1b1 (patch)
treeb02ef1a91039968996606fb62e542a0c3e24419a /Documentation
parentcba97805cb69d5b1a1d3bb108872c73b5bf0e205 (diff)
drm/nouveau/acpi: fix lockup with PCIe runtime PM
Since "PCI: Add runtime PM support for PCIe ports", the parent PCIe port can be runtime-suspended which disables power resources via ACPI. This is incompatible with DSM, resulting in a GPU device which is still in D3 and locks up the kernel on resume (on a Clevo P651RA, GTX965M). Mirror the behavior of Windows 8 and newer[1] (as observed via an AMLi debugger trace) and stop using the DSM functions for D3cold when power resources are available on the parent PCIe port. pci_d3cold_disable() is not used because on some machines, the old DSM method is broken. On a Lenovo T440p (GT 730M) memory and disk corruption would occur, but that is fixed with this patch[2]. [1]: https://msdn.microsoft.com/windows/hardware/drivers/bringup/firmware-requirements-for-d3cold [2]: https://github.com/Bumblebee-Project/bbswitch/issues/78#issuecomment-223549072 v2: simply check directly for _PR3. Added affected machines. v3: fixed block comment coding style. Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Peter Wu <peter@lekensteyn.nl> Acked-by: Dave Airlie <airlied@redhat.com Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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