From: David S. Miller <davem@davemloft.net>
Date: Sat, 19 Sep 2020 00:47:07 +0000 (-0700)
Subject: Merge branch 'net-ipa-wake-up-system-on-RX-available'
X-Git-Tag: v5.15~2655^2~213
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5e43df14d6b436ca767676bc8e41506dc03c4d89;p=platform%2Fkernel%2Flinux-starfive.git

Merge branch 'net-ipa-wake-up-system-on-RX-available'

Alex Elder says:

====================
net: ipa: wake up system on RX available

This series arranges for the IPA driver to wake up a suspended
system if the IPA hardware has a packet to deliver to the AP.

Version 2 replaced the first patch from version 1 with three
patches, in response to David Miller's feedback.  And based on
Bjorn Andersson's feedback on version 2, this version reworks
the tracking of IPA clock references.  As a result, we no
longer need a flag to determine whether a "don't' suspend" clock
reference is held (though an bit in a bitmask is still used for
a different purpose).

In summary:
    - A refcount_t is used to track IPA clock references where an
      atomic_t was previously used.  (This may go away soon as well,
      with upcoming work to implement runtime PM.)
    - We no longer track whether a special reference has been taken
      to avoid suspending IPA.
    - A bit in a bitmask is used to ensure we only trigger a system
      resume once per system suspend.
And from the original series:
    - Suspending endpoints only occurs when suspending the driver,
      not when dropping the last clock reference.  Resuming
      endpoints is also disconnected from starting the clock.
    - The IPA SUSPEND interrupt is now a wakeup interrupt.  If it
      fires, it schedules a system resume operation.
    - The GSI interrupt is no longer a wakeup interrupt.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
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5e43df14d6b436ca767676bc8e41506dc03c4d89