[0/4] Add interconnect sync state support

Message

Georgi Djakov July 9, 2020, 11:07 a.m. UTC

Bootloaders often leave some system resources enabled such as clocks,
regulators, interconnects etc. We want to keep these resources enabled
until all their consumers are probed. These resources are often shared,
so we must wait for all the consumers to come up, before deciding
whether to turn them off or change the configuration. This patchset is
trying to solve the above problem just for the on-chip interconnects.

The problem is solved by allowing the interconnect providers to specify
an initial bandwidth value, which is enforced during boot as a floor
value, while the requests from all consumers are being collected.
Then the sync_state() callback is used to signal when all consumers have
been probed, meaning that the floor bandwidth is not needed anymore and
the framework is ready to re-aggregate and process all requests.

Georgi Djakov (4):
  interconnect: Add sync state support
  interconnect: Add get_bw() callback
  interconnect: qcom: smd845: Use icc_sync_state
  interconnect: qcom: osm-l3: Use icc_sync_state

 drivers/interconnect/core.c           | 57 +++++++++++++++++++++++++++
 drivers/interconnect/qcom/osm-l3.c    |  9 +++++
 drivers/interconnect/qcom/sdm845.c    |  9 +++++
 include/linux/interconnect-provider.h |  5 +++
 4 files changed, 80 insertions(+)