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IRQ polling logic has been implemented to drain the post-boot/resume
EC events:
1. Triggered by the following code, invoked from acpi_ec_enable_event():
if (!test_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
advance_transaction(ec);
2. Drained by the following code, invoked after acpi_ec_complete_query():
if (status & ACPI_EC_FLAG_SCI)
acpi_ec_submit_query(ec);
This facility is safer than the old CLEAR_ON_RESUME quirk as the
CLEAR_ON_RESUME quirk sends EC query commands unconditionally. The
behavior is apparently not suitable for firmware that requires
QUERY_HANDSHAKE quirk. Though the QUERY_HANDSHAKE quirk isn't used
now because of the improvement done in the EC transaction state
machine (ec_event_clearing=QUERY), it is the proof that we cannot
send EC query command unconditionally.
So it's time to delete the out-dated CLEAR_ON_RESUME quirk to let the
users to try the newer approach.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=191211
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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