linux-kernel - [PATCH v2 0/2] Add interconnect sync state support

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Message-Id: <20200722110139.24778-1-georgi.djakov@linaro.org>
Date:   Wed, 22 Jul 2020 14:01:37 +0300
From:   Georgi Djakov <georgi.djakov@...aro.org>
To:     linux-pm@...r.kernel.org
Cc:     saravanak@...gle.com, mdtipton@...eaurora.org,
        okukatla@...eaurora.org, bjorn.andersson@...aro.org,
        vincent.guittot@...aro.org, georgi.djakov@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/2] Add interconnect sync state support

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 values, which are enforced during boot as floor
values, 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.

v2:
* Support initial values for both average and peak bandwidth (Mike)
* Skip aggregating/setting for nodes that don't specify initial bw (Mike)
* Drop patch 2/4: Add get_bw() callback (Mike)
* Squash patches 3 and 4.

v1: https://lore.kernel.org/lkml/20200709110705.30359-1-georgi.djakov@linaro.org/

Georgi Djakov (2):
  interconnect: Add sync state support
  interconnect: qcom: Use icc_sync_state in sdm845 and osm-3l drivers

 drivers/interconnect/core.c           | 61 +++++++++++++++++++++++++++
 drivers/interconnect/qcom/osm-l3.c    |  3 ++
 drivers/interconnect/qcom/sdm845.c    |  3 ++
 include/linux/interconnect-provider.h |  5 +++
 4 files changed, 72 insertions(+)