linux-kernel - Re: [PATCH 6/6] PSCI: cpuidle: Refactor CPU suspend power

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Message-ID: <cfa96819-dda8-e481-8421-250c7c4c7565@linaro.org>
Date:   Wed, 7 Aug 2019 20:09:45 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        linux-pm@...r.kernel.org
Cc:     Will Deacon <will@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        LKML <linux-kernel@...r.kernel.org>,
        LAKML <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 6/6] PSCI: cpuidle: Refactor CPU suspend power_state
 parameter handling

On 22/07/2019 17:37, Lorenzo Pieralisi wrote:
> Current PSCI code handles idle state entry through the
> psci_cpu_suspend_enter() API, that takes an idle state index as a
> parameter and convert the index into a previously initialized
> power_state parameter before calling the PSCI.CPU_SUSPEND() with it.
> 
> This is unwieldly, since it forces the PSCI firmware layer to keep track
> of power_state parameter for every idle state so that the
> index->power_state conversion can be made in the PSCI firmware layer
> instead of the CPUidle driver implementations.
> 
> Move the power_state handling out of drivers/firmware/psci
> into the respective ACPI/DT PSCI CPUidle backends and convert
> the psci_cpu_suspend_enter() API to get the power_state
> parameter as input, which makes it closer to its firmware
> interface PSCI.CPU_SUSPEND() API.
> 
> A notable side effect is that the PSCI ACPI/DT CPUidle backends
> now can directly handle (and if needed update) power_state
> parameters before handing them over to the PSCI firmware
> interface to trigger PSCI.CPU_SUSPEND() calls.
> 
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Ulf Hansson <ulf.hansson@...aro.org>
> Cc: Sudeep Holla <sudeep.holla@....com>
> Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> ---

AFAICT,

Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>



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