[PATCH v3 0/2] nvme: APST support

[luto@kernel.org (Andy Lutomirski)]

As far as I can tell, APST works fine on every NVMe device I'm aware
of with the single exception of a particular Samsung device.  This
series enables APST by default but quirks it off on the offending
Samsung device.  Some Samsung engineers are taking a look, and,
depending on what they find, we may be able to change the quirk to
work around the bug rather than disabling APST outright.

I think it would be nice to queue this up for 4.11.

Changes from v2:

 - Remove a stray newline.
 - Use switch when translating pm_qos args to latency (Christoph)
 - I did *not* change the initialization sequence.  If we want to do
   that, can it be a followup patch?

Changes from v1:

 - Fix a totally wrong comment in the quirk code (me)
 - Add a comment about not redetecting quirks after reset (Keith)
 - Rearrange the series to avoid bisection problems (Jens)

Once fully applied, v1 and v2 only differ in their comments.

Changes from before:

 - Rebased to linux-block/for-next.
 - I added a quirk for the known-bad Samsung device.
 - It's fully integrated with dev_pm_qos.
 - I now program APST after all the queues are set up, which seems safer.
   (This didn't fix the Samsung problem, though.)

Andy Lutomirski (2):
  nvme: Add a quirk mechanism that uses identify_ctrl
  nvme: Enable autonomous power state transitions

 drivers/nvme/host/core.c | 217 +++++++++++++++++++++++++++++++++++++++++++++++
 drivers/nvme/host/nvme.h |  13 +++
 drivers/nvme/host/pci.c  |   2 +
 drivers/nvme/host/rdma.c |   2 +
 include/linux/nvme.h     |   6 ++
 5 files changed, 240 insertions(+)

-- 
2.9.3