[PATCH v3 0/2] Add CPU power management for CPU bound CTI devices.

From: Mike Leach <mike.leach@linaro.org>
To: linux-arm-kernel@lists.infradead.org, coresight@lists.linaro.org,
	mathieu.poirier@linaro.org
Cc: tglx@linutronix.de, Mike Leach <mike.leach@linaro.org>,
	suzuki.poulose@arm.com
Subject: [PATCH v3 0/2] Add CPU power management for CPU bound CTI devices.
Date: Mon, 11 May 2020 21:48:34 +0100	[thread overview]
Message-ID: <20200511204836.27870-1-mike.leach@linaro.org> (raw)

Adds in power management for CPU bound CTI devices:
i) CPU Hotplug - registers a new notifier for CPU start and stop events.
ii) CPU idle PM event notifier to handle PM_ENTER, PM_ENTER_FAILED and
PM_EXIT events.

Tested with DB410c on coresight/next tree (Linux 5.7-rc1)

Changes since v2:
1) removed helper functions filtering on CONFIG_CPU_PM to call cpu_pm
fns directly.
2) add check for return value from cpuhp_remove_state_nocalls().

Changes since V1: (requested by Mathieu).
1) Split into separate patches for CPU pm and CPU hotplug handling.
2) Enable on hotplug has a specific function to enable the hardware,
while leaving the enable reference counts unchanged.

Mike Leach (2):
  coresight: cti: Add CPU Hotplug handling to CTI driver.
  coresight: cti: Add CPU idle pm notifer to CTI devices.

 drivers/hwtracing/coresight/coresight-cti.c | 160 ++++++++++++++++++++
 include/linux/cpuhotplug.h                  |   1 +
 2 files changed, 161 insertions(+)

-- 
2.17.1

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