From: geert@linux-m68k.org (Geert Uytterhoeven)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power
Date: Thu, 23 Feb 2017 16:34:50 +0100 [thread overview]
Message-ID: <CAMuHMdX3_Vjw2NNTE1XnQkuKS=7YDA4eccEFO1pAZkjw_4q9cg@mail.gmail.com> (raw)
In-Reply-To: <CAMuHMdVTEbqEocYwu=KW_uXpykYkVwUgSJBnLvQp_Epn8Pjp1g@mail.gmail.com>
Hi Sudeep,
On Thu, Feb 23, 2017 at 4:26 PM, Geert Uytterhoeven
<geert@linux-m68k.org> wrote:
> On Wed, Feb 22, 2017 at 3:32 PM, Sudeep Holla <sudeep.holla@arm.com> wrote:
>> On 22/02/17 13:38, Geert Uytterhoeven wrote:
>>> On Wed, Feb 22, 2017 at 12:03 PM, Sudeep Holla <sudeep.holla@arm.com> wrote:
>>> 4. Patch 3/6 adds a new "shallow" state, as it allows to save more
>>> power (the difference may be due to suboptimal cpuidle platform support on R-Car Gen3, though),
>>
>> Why can't you do that in s2idle mode. Please give me the difference
>> between your shallow state and s2idle state, not just power numbers
>> but the actual state of CPUs and the devices in the system.
>
> From the Linux side, there's not much difference, except that the secondary
> CPU cores are disabled. As that is handled by PSCI, the difference may be
> in the PSCI implementation. I will have to check that...
>
> On these SoCs, the individual CPU cores and the SCU/L2 are in separate
> (nested) power areas. Perhaps these power areas are turned off when
> disabling the CPU cores, but not when suspending them.
BTW, I don't care much about the extra state.
>>> E.g. on non-PSCI platforms with an Ethernet driver that supports
>>> Wake-on-LAN, I can do:
>>>
>>> ethtool -s eth0 wol g
>>> echo mem > /sys/power/state
>>>
>>> and be sure that the system can be woken up by sending a WoL MagicPacket.
>>
>> Still possible with s2idle if CPU_SUSPEND is correctly implemented by
>> the platform.
>
> Sure. But not automatic, as it needs fiddling with mem_sleep.
I do care about this, as it affects user experience.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
next prev parent reply other threads:[~2017-02-23 15:34 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
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 [this message]
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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