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From:   Abel Vesa <abel.vesa@linaro.org>
To:     "Rafael J. Wysocki" <rafael@kernel.org>,
        Kevin Hilman <khilman@kernel.org>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        Pavel Machek <pavel@ucw.cz>, Len Brown <len.brown@intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Andy Gross <agross@kernel.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        Mike Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Saravana Kannan <saravanak@google.com>
Cc:     linux-pm@vger.kernel.org,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org,
        Doug Anderson <dianders@chromium.org>,
        Matthias Kaehlcke <mka@chromium.org>
Subject: [PATCH v3 0/4] Allow genpd providers to power off domains on sync state
Date:   Mon, 27 Mar 2023 22:38:25 +0300
Message-Id: <20230327193829.3756640-1-abel.vesa@linaro.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

There have been already a couple of tries to make the genpd "disable
unused" late initcall skip the powering off of domains that might be
needed until later on (i.e. until some consumer probes). The conclusion
was that the provider could return -EBUSY from the power_off callback
until the provider's sync state has been reached. This patch series tries
to provide a proof-of-concept that is working on Qualcomm platforms.

I've been doing extensive testing on SM8450, but I've also spinned this
on my X13s (SC8280XP). Both patches that add the sync state callback to
the SC8280XP and SM8450 are here to provide context. Once we agree on
the form, I intend to add the sync state callback to all gdsc providers.

Currently, some of the gdsc providers might not reach sync state due to
list of consumers not probing yet (or at all). The sync state can be
enforced by writing 1 to the state_synced sysfs attribute of the
provider, thanks to Saravana's commit [1] which has been already merged.

[1] https://lore.kernel.org/r/20230304005355.746421-3-saravanak@google.com

V2 (RFC) of this patchset was here:
https://lore.kernel.org/all/20230320134217.1685781-1-abel.vesa@linaro.org/

Changes since v2:
 * renamed genpd_queue_power_off_work to pm_genpd_queue_power_off and added
   comment about its purpose w.r.t. it being exported.
 * added the qcom_cc generic sync state callback to all providers that
   register GDSCs, instead of SM8450 and SC8280XP

Changes since v1:
 * Added the qcom_cc sync state callback which calls in turn the gdsc one
 * dropped extra semicolon from pm_domain.h

Abel Vesa (4):
  PM: domains: Allow power off queuing from providers
  soc: qcom: rpmhpd: Do proper power off when state synced
  clk: qcom: gdsc: Avoid actual power off until sync state
  clk: qcom: Add sync state callback to all providers

 drivers/base/power/domain.c            | 18 ++++++++++--------
 drivers/clk/qcom/apss-ipq6018.c        |  1 +
 drivers/clk/qcom/camcc-sc7180.c        |  1 +
 drivers/clk/qcom/camcc-sc7280.c        |  1 +
 drivers/clk/qcom/camcc-sdm845.c        |  1 +
 drivers/clk/qcom/camcc-sm6350.c        |  1 +
 drivers/clk/qcom/camcc-sm8250.c        |  1 +
 drivers/clk/qcom/camcc-sm8450.c        |  1 +
 drivers/clk/qcom/common.c              | 19 +++++++++++++++++++
 drivers/clk/qcom/common.h              |  2 ++
 drivers/clk/qcom/dispcc-qcm2290.c      |  1 +
 drivers/clk/qcom/dispcc-sc7180.c       |  1 +
 drivers/clk/qcom/dispcc-sc7280.c       |  1 +
 drivers/clk/qcom/dispcc-sc8280xp.c     |  1 +
 drivers/clk/qcom/dispcc-sdm845.c       |  1 +
 drivers/clk/qcom/dispcc-sm6115.c       |  1 +
 drivers/clk/qcom/dispcc-sm6125.c       |  1 +
 drivers/clk/qcom/dispcc-sm6350.c       |  1 +
 drivers/clk/qcom/dispcc-sm6375.c       |  1 +
 drivers/clk/qcom/dispcc-sm8250.c       |  1 +
 drivers/clk/qcom/dispcc-sm8450.c       |  1 +
 drivers/clk/qcom/dispcc-sm8550.c       |  1 +
 drivers/clk/qcom/gcc-apq8084.c         |  1 +
 drivers/clk/qcom/gcc-ipq806x.c         |  1 +
 drivers/clk/qcom/gcc-ipq8074.c         |  1 +
 drivers/clk/qcom/gcc-mdm9615.c         |  1 +
 drivers/clk/qcom/gcc-msm8660.c         |  1 +
 drivers/clk/qcom/gcc-msm8909.c         |  1 +
 drivers/clk/qcom/gcc-msm8916.c         |  1 +
 drivers/clk/qcom/gcc-msm8939.c         |  1 +
 drivers/clk/qcom/gcc-msm8953.c         |  1 +
 drivers/clk/qcom/gcc-msm8960.c         |  1 +
 drivers/clk/qcom/gcc-msm8974.c         |  1 +
 drivers/clk/qcom/gcc-msm8976.c         |  1 +
 drivers/clk/qcom/gcc-msm8994.c         |  1 +
 drivers/clk/qcom/gcc-msm8996.c         |  1 +
 drivers/clk/qcom/gcc-msm8998.c         |  1 +
 drivers/clk/qcom/gcc-qcm2290.c         |  1 +
 drivers/clk/qcom/gcc-qcs404.c          |  1 +
 drivers/clk/qcom/gcc-qdu1000.c         |  1 +
 drivers/clk/qcom/gcc-sa8775p.c         |  1 +
 drivers/clk/qcom/gcc-sc7180.c          |  1 +
 drivers/clk/qcom/gcc-sc7280.c          |  1 +
 drivers/clk/qcom/gcc-sc8180x.c         |  1 +
 drivers/clk/qcom/gcc-sc8280xp.c        |  1 +
 drivers/clk/qcom/gcc-sdm660.c          |  1 +
 drivers/clk/qcom/gcc-sdm845.c          |  1 +
 drivers/clk/qcom/gcc-sdx55.c           |  1 +
 drivers/clk/qcom/gcc-sdx65.c           |  1 +
 drivers/clk/qcom/gcc-sm6115.c          |  1 +
 drivers/clk/qcom/gcc-sm6125.c          |  1 +
 drivers/clk/qcom/gcc-sm6350.c          |  1 +
 drivers/clk/qcom/gcc-sm6375.c          |  1 +
 drivers/clk/qcom/gcc-sm7150.c          |  1 +
 drivers/clk/qcom/gcc-sm8150.c          |  1 +
 drivers/clk/qcom/gcc-sm8250.c          |  1 +
 drivers/clk/qcom/gcc-sm8350.c          |  1 +
 drivers/clk/qcom/gcc-sm8450.c          |  1 +
 drivers/clk/qcom/gcc-sm8550.c          |  1 +
 drivers/clk/qcom/gdsc.c                | 26 ++++++++++++++++++++++++++
 drivers/clk/qcom/gdsc.h                |  6 ++++++
 drivers/clk/qcom/gpucc-msm8998.c       |  1 +
 drivers/clk/qcom/gpucc-sc7180.c        |  1 +
 drivers/clk/qcom/gpucc-sc7280.c        |  1 +
 drivers/clk/qcom/gpucc-sc8280xp.c      |  1 +
 drivers/clk/qcom/gpucc-sdm660.c        |  1 +
 drivers/clk/qcom/gpucc-sdm845.c        |  1 +
 drivers/clk/qcom/gpucc-sm6115.c        |  1 +
 drivers/clk/qcom/gpucc-sm6125.c        |  1 +
 drivers/clk/qcom/gpucc-sm6350.c        |  1 +
 drivers/clk/qcom/gpucc-sm6375.c        |  1 +
 drivers/clk/qcom/gpucc-sm8150.c        |  1 +
 drivers/clk/qcom/gpucc-sm8250.c        |  1 +
 drivers/clk/qcom/gpucc-sm8350.c        |  1 +
 drivers/clk/qcom/lcc-ipq806x.c         |  1 +
 drivers/clk/qcom/lpassaudiocc-sc7280.c |  1 +
 drivers/clk/qcom/lpasscc-sc7280.c      |  1 +
 drivers/clk/qcom/lpasscorecc-sc7180.c  |  2 ++
 drivers/clk/qcom/lpasscorecc-sc7280.c  |  2 ++
 drivers/clk/qcom/mmcc-apq8084.c        |  1 +
 drivers/clk/qcom/mmcc-msm8974.c        |  1 +
 drivers/clk/qcom/mmcc-msm8994.c        |  1 +
 drivers/clk/qcom/mmcc-msm8996.c        |  1 +
 drivers/clk/qcom/mmcc-msm8998.c        |  1 +
 drivers/clk/qcom/mmcc-sdm660.c         |  1 +
 drivers/clk/qcom/videocc-sc7180.c      |  1 +
 drivers/clk/qcom/videocc-sc7280.c      |  1 +
 drivers/clk/qcom/videocc-sdm845.c      |  1 +
 drivers/clk/qcom/videocc-sm8150.c      |  1 +
 drivers/clk/qcom/videocc-sm8250.c      |  1 +
 drivers/soc/qcom/rpmhpd.c              | 19 +++++++------------
 include/linux/pm_domain.h              |  4 ++++
 92 files changed, 161 insertions(+), 20 deletions(-)

-- 
2.34.1