This is a proof-of-concept hack to demonstrate what I was
trying to describe earlier.
The last patch, in particular, takes some very ugly short-cuts
which I would never dream of proposing for upstream inclusion.

It seems to work, but I haven't tested thoroughly.  I may not even be
doing what I think it is doing...

Comments?

Thanks,
NeilBrown
---

NeilBrown (4):
      mmc: core: fold mmc_set_bus_width calls into sdio_enable_4bit_bus.
      mmc/core: add pm_runtime tracking to mmc_host devices.
      mmc/sdio: keep device awake when interrupts expected in 4bit mode
      mmc/host: use runtime_pm to switch to 1-bit mode


 drivers/mmc/core/core.c |    5 +++
 drivers/mmc/core/host.c |   78 ++++++++++++++++++++++++++++++++++++++++++++++-
 drivers/mmc/core/sdio.c |   41 +++++++++++--------------
 3 files changed, 100 insertions(+), 24 deletions(-)

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