From: Daniel Lezcano <daniel.lezcano@linaro.org>
To: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>, linux-pm@vger.kernel.org
Cc: Ulf Hansson <ulf.hansson@linaro.org>,
Sudeep Holla <sudeep.holla@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
LAKML <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 4/6] ARM: psci: cpuidle: Introduce PSCI CPUidle driver
Date: Wed, 7 Aug 2019 18:30:28 +0200 [thread overview]
Message-ID: <41813f90-8a1e-b712-328c-0390bfe4a471@linaro.org> (raw)
In-Reply-To: <20190722153745.32446-5-lorenzo.pieralisi@arm.com>
On 22/07/2019 17:37, Lorenzo Pieralisi wrote:
> PSCI firmware is the standard power management control for
> all ARM64 based platforms and it is also deployed on some
> ARM 32 bit platforms to date.
>
> Idle state entry in PSCI is currently achieved by calling
> arm_cpuidle_init() and arm_cpuidle_suspend() in a generic
> idle driver, which in turn relies on ARM/ARM64 CPUidle back-end
> to relay the call into PSCI firmware if PSCI is the boot method.
>
> Given that PSCI is the standard idle entry method on ARM64 systems
> (which means that no other CPUidle driver are expected on ARM64
> platforms - so PSCI is already a generic idle driver), in order to
> simplify idle entry and code maintenance, it makes sense to have a PSCI
> specific idle driver so that idle code that it is currently living in
> drivers/firmware directory can be hoisted out of it and moved
> where it belongs, into a full-fledged PSCI driver, leaving PSCI code
> in drivers/firmware as a pure firmware interface, as it should be.
>
> Implement a PSCI CPUidle driver. By default it is a silent Kconfig entry
> which is left unselected, since it selection would clash with the
> generic ARM CPUidle driver that provides a PSCI based idle driver
> through the arm/arm64 arches back-ends CPU operations.
>
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Cc: Ulf Hansson <ulf.hansson@linaro.org>
> Cc: Sudeep Holla <sudeep.holla@arm.com>
> Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
> ---
Modulo Ulf and Sudeep comments,
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
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next prev parent reply other threads:[~2019-08-07 16:30 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-22 15:37 [PATCH 0/6] ARM: psci: cpuidle: PSCI CPUidle rework Lorenzo Pieralisi
2019-07-22 15:37 ` [PATCH 1/6] ARM: cpuidle: Remove useless header include Lorenzo Pieralisi
2019-08-06 15:51 ` Sudeep Holla
2019-08-07 8:19 ` Daniel Lezcano
2019-07-22 15:37 ` [PATCH 2/6] ARM: cpuidle: Remove overzealous error logging Lorenzo Pieralisi
2019-08-06 15:51 ` Sudeep Holla
2019-08-07 8:20 ` Daniel Lezcano
2019-07-22 15:37 ` [PATCH 3/6] drivers: firmware: psci: Decouple checker from generic ARM CPUidle Lorenzo Pieralisi
2019-08-06 15:54 ` Sudeep Holla
2019-08-07 14:09 ` Daniel Lezcano
2019-07-22 15:37 ` [PATCH 4/6] ARM: psci: cpuidle: Introduce PSCI CPUidle driver Lorenzo Pieralisi
2019-07-23 11:46 ` Ulf Hansson
2019-07-23 14:15 ` Lorenzo Pieralisi
2019-08-06 16:10 ` Sudeep Holla
2019-08-06 16:34 ` Lorenzo Pieralisi
2019-08-07 16:30 ` Daniel Lezcano [this message]
2019-07-22 15:37 ` [PATCH 5/6] ARM: psci: cpuidle: Enable " Lorenzo Pieralisi
2019-08-06 16:16 ` Sudeep Holla
2019-08-06 16:40 ` Lorenzo Pieralisi
2019-07-22 15:37 ` [PATCH 6/6] PSCI: cpuidle: Refactor CPU suspend power_state parameter handling Lorenzo Pieralisi
2019-07-23 11:47 ` Ulf Hansson
2019-08-07 18:09 ` Daniel Lezcano
2019-08-08 12:55 ` Sudeep Holla
2019-08-08 15:29 ` Ulf Hansson
2019-08-08 16:04 ` Sudeep Holla
2019-07-23 11:49 ` [PATCH 0/6] ARM: psci: cpuidle: PSCI CPUidle rework Ulf Hansson
2019-07-23 14:19 ` Lorenzo Pieralisi
2019-08-09 11:03 ` [PATCH v2 0/8] " Lorenzo Pieralisi
2019-08-09 11:03 ` [PATCH v2 1/8] ARM: cpuidle: Remove useless header include Lorenzo Pieralisi
2019-08-09 11:03 ` [PATCH v2 2/8] ARM: cpuidle: Remove overzealous error logging Lorenzo Pieralisi
2019-08-09 11:03 ` [PATCH v2 3/8] drivers: firmware: psci: Decouple checker from generic ARM CPUidle Lorenzo Pieralisi
2019-08-09 11:03 ` [PATCH v2 4/8] ARM: psci: cpuidle: Introduce PSCI CPUidle driver Lorenzo Pieralisi
2019-08-09 11:03 ` [PATCH v2 5/8] ARM: psci: cpuidle: Enable " Lorenzo Pieralisi
2019-08-09 11:03 ` [PATCH v2 6/8] PSCI: cpuidle: Refactor CPU suspend power_state parameter handling Lorenzo Pieralisi
2019-08-09 11:03 ` [PATCH v2 7/8] arm64: defconfig: Enable the PSCI CPUidle driver Lorenzo Pieralisi
2019-08-09 16:53 ` Will Deacon
2019-08-09 11:03 ` [PATCH v2 8/8] ARM: imx_v6_v7_defconfig: " Lorenzo Pieralisi
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