tree ef2a4c77b1aa36414499d176e709aae58fecc853
parent ac62a0174d62ae0f4447c0c8cf35a8e5d793df56
author Alex Elder <elder@linaro.org> 1643727725 -0600
committer Jakub Kicinski <kuba@kernel.org> 1643904223 -0800

net: ipa: request IPA register values be retained

In some cases, the IPA hardware needs to request the always-on
subsystem (AOSS) to coordinate with the IPA microcontroller to
retain IPA register values at power collapse.  This is done by
issuing a QMP request to the AOSS microcontroller.  A similar
request ondoes that request.

We must get and hold the "QMP" handle early, because we might get
back EPROBE_DEFER for that.  But the actual request should be sent
while we know the IPA clock is active, and when we know the
microcontroller is operational.

Fixes: 1aac309d3207 ("net: ipa: use autosuspend")
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>