[RFC PATCH 0/2] rtsx_usb: runtime PM fixes before tray-reader detect rework

[Sean Rhodes]

This is an RFC for the USB/cardreader side of the rtsx tray-reader issue.

Assuming the separate resume-reset fix has landed, this is the next step:
clean up runtime PM handling in the USB/cardreader layer before attempting
any further MMC-side detect changes.

Patch 1 holds a runtime PM reference across transfers and marks the device
busy afterwards.

Patch 2 avoids issuing USB register I/O from the runtime autosuspend path,
which can deadlock runtime PM and leave the device stuck in a suspending
state.

The remaining tray-reader false-detect problem likely needs event
qualification on the USB/cardreader side rather than MMC command probing
from ->get_cd(). Guidance on the right place for that logic would be
useful.

Sean Rhodes (2):
  rtsx_usb: hold runtime PM during transfers
  rtsx_usb: avoid USB I/O in runtime autosuspend

 drivers/misc/cardreader/rtsx_usb.c | 49 +++++++++++++++++++++++-------
 include/linux/rtsx_usb.h           |  3 ++
 2 files changed, 41 insertions(+), 11 deletions(-)