[PATCH 0/4][SRU][Focal] fix ACPI EC initisation failures

[Alex Hung]

BugLink: https://bugs.launchpad.net/bugs/1896482

[Impact]

The bug causes the EC driver to fail and ACPI events are no longer
handled by Linux kernel, i.e lid close no longer triggers suspends.

[Fix]

Upstream commit 03e9a0e05739cf reworks ec_install_handlers to avoid
initialisation failures.

The other three patches are prerequisite to apply 03e9a0e05739cf on
focal kernel.

[Test]

Tested with Lenovo ThinkPad X1 Carbon Gen 8

[Regression Potential]

Low. The patches were cherry-picked from mainline kernel (two since 5.5
and two since 5.7)

Daniel Drake (2):
  ACPI: EC: tweak naming in preparation for GpioInt support
  ACPI: EC: add support for hardware-reduced systems

Rafael J. Wysocki (2):
  ACPI: EC: Avoid passing redundant argument to functions
  ACPI: EC: Consolidate event handler installation code

 drivers/acpi/ec.c       | 218 +++++++++++++++++++++++++++++++++---------------
 drivers/acpi/internal.h |   3 +-
 2 files changed, 154 insertions(+), 67 deletions(-)

-- 
2.7.4