linux-kernel - Re: [PATCH v6 0/3] Add Qualcomm MPM irqchip driver support

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Message-ID: <CAPDyKFpTyj86deODjOLwVoWM_PoK8458xYY=kn0srEGYZj9+mQ@mail.gmail.com>
Date:   Wed, 4 May 2022 16:08:58 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Shawn Guo <shawn.guo@...aro.org>
Cc:     Marc Zyngier <maz@...nel.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Maulik Shah <quic_mkshah@...cinc.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 0/3] Add Qualcomm MPM irqchip driver support

On Wed, 23 Feb 2022 at 13:57, Shawn Guo <shawn.guo@...aro.org> wrote:
>
> It starts from updating cpu_pm to support CPU_LAST_PM_ENTER (and
> CPU_FIRST_PM_EXIT) event, and then adds DT binding and driver support
> for Qualcomm MPM (MSM Power Manager) interrupt controller.
>
> Changes for v6:
> - Add new event CPU_LAST_PM_ENTER (and CPU_FIRST_PM_EXIT) in cpu_pm
> - Drop vendor driver notes from commit log
> - Check NULL mpm_gic_map instead to save the use of MPM_NO_PARENT_IRQ
> - Add lock protection for register read in qcom_mpm_handler()
> - Return IRQ_NONE if there is no pending interrupt
> - Drop IRQF_TRIGGER_RISING flag from devm_request_irq() call since it's
>   being specified in DT
> - Drop dev_set_drvdata() call which is a leftover from previous version
> - Fix dt_binding_check errors reported by upgraded dtschema

My apologies for the late reply to this series. FYI, I fully agree
with the responses from Sudeep, etc, that have been made on this
series.

The proper thing is to use genpd on/off notifiers, which should get
fired if you model the PM domain topology correctly in DT - and use
PSCI OSI.

That said, please keep me posted when/if you submit a new version for
this. I will make sure to pay more attention next time.

Kind regards
Uffe

>
> Changes for v5:
> - Drop inline attributes and let compiler to decide
> - Use _irqsave/_irqrestore flavour for spin lock
> - Assignment on a single for irq_resolve_mapping() call
> - Add documentation to explain vMPM ownership transition
> - Move MPM pin map data into device tree and so use a generic compatible
> - Drop the code that counts CPUs in PM and use CPU_CLUSTER_PM_ENTER
>   notification instead
>
> Changes for v4:
> - Add the missing include of <linux/interrupt.h> to fix build errors
>   on arm architecture.
> - Leave IRQCHIP_PLATFORM_DRIVER infrastructural unchanged, and use
>   of_find_device_by_node() to get platform_device pointer.
>
> Changes for v3:
> - Support module build
> - Use relaxed accessors
> - Add barrier call to ensure MMIO write completes
> - Use d->chip_data to pass driver private data
> - Use raw spinlock
> - USe BIT() for bit shift
> - Create a single irq domain to cover both types of MPM pins
> - Call irq_resolve_mapping() to find out Linux irq number
> - Save the use of ternary conditional operator and use switch/case for
>   .irq_set_type call
> - Drop unnecessary .irq_disable hook
> - Align qcom_mpm_chip and qcom_mpm_ops members vertically
> - Use helper irq_domain_translate_twocell()
> - Move mailbox requesting forward in probe function
> - Improve the documentation on qcm2290_gic_pins[]
> - Use IRQCHIP_PLATFORM_DRIVER infrastructural
> - Use cpu_pm notifier instead of .suspend_late hook to write MPM for
>   sleep, so that MPM can be set up for both suspend and idle context.
>   The TIMER0/1 setup is currently omitted for idle use case though,
>   as I haven't been able to successfully test the idle context.
>
> Shawn Guo (3):
>   PM: cpu: Add CPU_LAST_PM_ENTER and CPU_FIRST_PM_EXIT support
>   dt-bindings: interrupt-controller: Add Qualcomm MPM support
>   irqchip: Add Qualcomm MPM controller driver
>
>  .../interrupt-controller/qcom,mpm.yaml        |  96 ++++
>  drivers/irqchip/Kconfig                       |   8 +
>  drivers/irqchip/Makefile                      |   1 +
>  drivers/irqchip/qcom-mpm.c                    | 439 ++++++++++++++++++
>  include/linux/cpu_pm.h                        |  15 +
>  kernel/cpu_pm.c                               |  33 +-
>  6 files changed, 590 insertions(+), 2 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/qcom,mpm.yaml
>  create mode 100644 drivers/irqchip/qcom-mpm.c
>
> --
> 2.25.1
>