From: sudeep.holla@arm.com (Sudeep Holla)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH/RFC 4/6] drivers: firmware: psci: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power
Date: Tue, 21 Feb 2017 10:50:03 +0000 [thread overview]
Message-ID: <bed72738-93c7-c0da-d6c7-383d6881dbdd@arm.com> (raw)
In-Reply-To: <1487622809-25127-5-git-send-email-geert+renesas@glider.be>
On 20/02/17 20:33, Geert Uytterhoeven wrote:
> Nothing in the PSCI specification requires the SoC to remain powered and
> to support wake-up sources when suspended using SYSTEM_SUSPEND.
> If the firmware implements the PSCI SYSTEM_SUSPEND operation by cutting
> power to the SoC, the only possibly wake-up sources are thus the ones
> connected to the PMIC.
>
> Document and add support for an "arm,psci-system-suspend-is-power-down"
> DT property, so Linux uses a different suspend method when other wake-up
> sources (e.g. wake on LAN, UART or GPIO) are enabled.
>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> ---
> Documentation/devicetree/bindings/arm/psci.txt | 11 +++++++++++
> drivers/firmware/psci.c | 13 ++++++++++---
> 2 files changed, 21 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/arm/psci.txt b/Documentation/devicetree/bindings/arm/psci.txt
> index a2c4f1d524929bb7..16e390ecb7531028 100644
> --- a/Documentation/devicetree/bindings/arm/psci.txt
> +++ b/Documentation/devicetree/bindings/arm/psci.txt
> @@ -68,6 +68,17 @@ state nodes, as per bindings in [1]) must specify the following properties:
> Definition: power_state parameter to pass to the PSCI
> suspend call.
>
> + - arm,psci-system-suspend-is-power-down
> + Nothing in the PSCI specification requires the SoC to remain
> + powered and to support wake-up sources when suspended using
> + SYSTEM_SUSPEND.
Again, yes SoC can be powered down but you give no reasons why this is
useful other than help you to hack around to implement suspend_ops. As
suggested please try using freeze_ops.
After commit a94e502c22b6 ("cpuidle: dt: assign ->enter_freeze to same
as ->enter callback function"), you can enter suspend-to-idle(a.k.a
freeze state) on all platforms using ARM DT cpuidle driver.
--
Regards,
Sudeep
next prev parent reply other threads:[~2017-02-21 10:50 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-20 20:33 [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Geert Uytterhoeven
2017-02-20 20:33 ` [PATCH/RFC 1/6] alarmtimer: Postpone wake-up source registration until really available Geert Uytterhoeven
2017-02-20 20:33 ` [PATCH/RFC 2/6] PM / Wakeup: Add wakeup_source_available() Geert Uytterhoeven
2017-02-20 20:33 ` [PATCH/RFC 3/6] drivers: firmware: psci: Implement shallow suspend mode Geert Uytterhoeven
2017-02-21 10:42 ` Sudeep Holla
2017-02-21 16:23 ` Geert Uytterhoeven
2017-02-21 16:51 ` Sudeep Holla
2017-02-21 11:07 ` Pavel Machek
2017-02-21 11:14 ` Sudeep Holla
2017-02-21 16:32 ` Geert Uytterhoeven
2017-02-21 17:20 ` Mark Rutland
2017-02-21 18:06 ` Geert Uytterhoeven
2017-02-21 18:18 ` Mark Rutland
2017-02-21 18:23 ` Geert Uytterhoeven
2017-02-21 17:22 ` Sudeep Holla
2017-02-22 13:47 ` Geert Uytterhoeven
2017-02-22 14:35 ` Sudeep Holla
2017-02-20 20:33 ` [PATCH/RFC 4/6] drivers: firmware: psci: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Geert Uytterhoeven
2017-02-21 10:50 ` Sudeep Holla [this message]
2017-02-21 16:36 ` Geert Uytterhoeven
2017-02-21 16:49 ` Sudeep Holla
2017-02-21 11:07 ` Pavel Machek
2017-02-21 16:36 ` Geert Uytterhoeven
2017-02-21 17:54 ` Mark Rutland
2017-02-21 17:48 ` Mark Rutland
2017-02-22 14:05 ` Geert Uytterhoeven
2017-02-22 14:57 ` Rafael J. Wysocki
2017-02-20 20:33 ` [PATCH/RFC 5/6] arm64: dts: r8a7795: Fix non-PMIC wake-up sources Geert Uytterhoeven
2017-02-20 20:33 ` [PATCH/RFC 6/6] arm64: dts: r8a7796: " Geert Uytterhoeven
2017-02-21 10:38 ` [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Sudeep Holla
2017-02-21 16:21 ` Geert Uytterhoeven
2017-02-21 16:45 ` Sudeep Holla
2017-02-21 17:34 ` Geert Uytterhoeven
2017-02-21 17:51 ` Sudeep Holla
2017-02-21 18:27 ` Sudeep Holla
2017-02-21 18:45 ` Sudeep Holla
2017-02-22 1:14 ` Rafael J. Wysocki
2017-02-22 11:03 ` Sudeep Holla
2017-02-22 13:38 ` Geert Uytterhoeven
2017-02-22 14:32 ` Sudeep Holla
2017-02-22 14:50 ` Rafael J. Wysocki
2017-02-22 15:24 ` Sudeep Holla
2017-02-23 15:26 ` Geert Uytterhoeven
2017-02-23 15:34 ` Geert Uytterhoeven
2017-02-23 15:58 ` Sudeep Holla
2017-02-23 15:53 ` Sudeep Holla
2017-02-22 13:14 ` Geert Uytterhoeven
2017-02-22 14:31 ` Rafael J. Wysocki
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