On Wed, Sep 18, 2019 at 01:15:55PM -0500, Mario Limonciello wrote: > The action of saving the PCI state will cause numerous PCI configuration > space reads which depending upon the vendor implementation may cause > the drive to exit the deepest NVMe state. > > In these cases ASPM will typically resolve the PCIe link state and APST > may resolve the NVMe power state. However it has also been observed > that this register access after quiesced will cause PC10 failure > on some device combinations. > > To resolve this, move the PCI state saving to before SetFeatures has been > called. This has been proven to resolve the issue across a 5000 sample > test on previously failing disk/system combinations. > > Signed-off-by: Mario Limonciello <mario.limoncie...@dell.com>
This looks good. It clashes with something I posted yesterday, but I'll rebase after this one. Reviewed-by: Keith Busch <kbu...@kernel.org>
