linux-kernel - [PATCH v2 00/21] pmdomain: Add generic ->sync

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Message-ID: <20250523134025.75130-1-ulf.hansson@linaro.org>
Date: Fri, 23 May 2025 15:39:57 +0200
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Saravana Kannan <saravanak@...gle.com>,
	Stephen Boyd <sboyd@...nel.org>,
	linux-pm@...r.kernel.org
Cc: "Rafael J . Wysocki" <rafael@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Michael Grzeschik <m.grzeschik@...gutronix.de>,
	Bjorn Andersson <andersson@...nel.org>,
	Abel Vesa <abel.vesa@...aro.org>,
	Peng Fan <peng.fan@....nxp.com>,
	Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
	Johan Hovold <johan@...nel.org>,
	Maulik Shah <maulik.shah@....qualcomm.com>,
	Michal Simek <michal.simek@....com>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Jonathan Hunter <jonathanh@...dia.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 00/21] pmdomain: Add generic ->sync_state() support to genpd

Changes in v2:
	- Well, quite a lot as I discovered various problems when doing
	additional testing of corner-case. I suggest re-review from scratch,
	even if I decided to keep some reviewed-by tags.
	- Added patches to allow some drivers that needs to align or opt-out
	from the new common behaviour in genpd.

If a PM domain (genpd) is powered-on during boot, there is probably a good
reason for it. Therefore it's known to be a bad idea to allow such genpd to be
powered-off before all of its consumer devices have been probed. This series
intends to fix this problem.

We have been discussing these issues at LKML and at various Linux-conferences
in the past. I have therefore tried to include the people I can recall being
involved, but I may have forgotten some (my apologies), feel free to loop them
in.

I have tested this with QEMU with a bunch of local test-drivers and DT nodes.
Let me know if you want me to share this code too.

Please help review and test!
Finally, a big thanks to Saravana for all the support!

Kind regards
Ulf Hansson


Saravana Kannan (1):
  driver core: Add dev_set_drv_sync_state()

Ulf Hansson (20):
  pmdomain: core: Use of_fwnode_handle()
  pmdomain: core: Add a bus and a driver for genpd providers
  pmdomain: core: Add the genpd->dev to the genpd provider bus
  pmdomain: core: Export a common ->sync_state() helper for genpd
    providers
  pmdomain: core: Prepare to add the common ->sync_state() support
  soc/tegra: pmc: Opt-out from genpd's common ->sync_state() support
  cpuidle: psci: Opt-out from genpd's common ->sync_state() support
  cpuidle: riscv-sbi: Opt-out from genpd's common ->sync_state() support
  pmdomain: qcom: rpmhpd: Use of_genpd_sync_state()
  pmdomain: qcom: rpmhpd: Use of_genpd_sync_state()
  firmware/pmdomain: xilinx: Move ->sync_state() support to firmware
    driver
  firmware: xilinx: Don't share zynqmp_pm_init_finalize()
  firmware: xilinx: Use of_genpd_sync_state()
  driver core: Export get_dev_from_fwnode()
  pmdomain: core: Add common ->sync_state() support for genpd providers
  pmdomain: core: Default to use of_genpd_sync_state() for genpd
    providers
  pmdomain: core: Leave powered-on genpds on until late_initcall_sync
  pmdomain: core: Leave powered-on genpds on until sync_state
  cpuidle: psci: Drop redundant sync_state support
  cpuidle: riscv-sbi: Drop redundant sync_state support

 drivers/base/core.c                         |   8 +-
 drivers/cpuidle/cpuidle-psci-domain.c       |  14 --
 drivers/cpuidle/cpuidle-riscv-sbi.c         |  14 --
 drivers/firmware/xilinx/zynqmp.c            |  18 +-
 drivers/pmdomain/core.c                     | 239 ++++++++++++++++++--
 drivers/pmdomain/qcom/rpmhpd.c              |   2 +
 drivers/pmdomain/qcom/rpmpd.c               |   2 +
 drivers/pmdomain/xilinx/zynqmp-pm-domains.c |  16 --
 drivers/soc/tegra/pmc.c                     |  26 ++-
 include/linux/device.h                      |  13 ++
 include/linux/firmware/xlnx-zynqmp.h        |   6 -
 include/linux/pm_domain.h                   |  17 ++
 12 files changed, 294 insertions(+), 81 deletions(-)

-- 
2.43.0