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From: Ulf Hansson <email@example.com>
To: Viresh Kumar <firstname.lastname@example.org>
Cc: "Rafael J . Wysocki" <email@example.com>,
Linux PM <firstname.lastname@example.org>,
Greg Kroah-Hartman <email@example.com>,
Jon Hunter <firstname.lastname@example.org>,
Geert Uytterhoeven <email@example.com>,
Todor Tomov <firstname.lastname@example.org>,
Rajendra Nayak <email@example.com>,
Vincent Guittot <firstname.lastname@example.org>,
Kevin Hilman <email@example.com>,
Linux Kernel Mailing List <firstname.lastname@example.org>,
Linux ARM <email@example.com>,
Subject: Re: [PATCH v2 0/9] PM / Domains: Add support for multi PM domains per device
Date: Thu, 31 May 2018 12:47:50 +0200 [thread overview]
Message-ID: <CAPDyKFribHht_H+qYRqKRhMT-h-wDqWR+VX2+FrKc9Pb52KcJQ@mail.gmail.com> (raw)
On 31 May 2018 at 11:14, Viresh Kumar <firstname.lastname@example.org> wrote:
> On 29-05-18, 12:04, Ulf Hansson wrote:
>> Changes in v2:
>> - Addressed comments from Geert around DT doc.
>> - Addressed comments from Jon around clarification of how to use this
>> and changes to returned error codes.
>> - Fixed build error in case CONFIG_PM was unset.
>> There are devices that are partitioned across multiple PM domains. Currently
>> these can't be supported well by the available PM infrastructures we have in
>> the kernel. This series is an attempt to address this.
>> The interesting parts happens from patch 5 an onwards, including a minor DT
>> update to the existing power-domain bindings, the 4 earlier are just trivial
>> clean-ups of some related code in genpd, which I happened to stumble over.
>> Some additional background:
>> One existing case where devices are partitioned across multiple PM domains, is
>> the Nvida Tegra 124/210 X-USB subsystem. A while ago Jon Hunter (Nvidia) sent a
>> series, trying to address these issues, however this is a new approach, while
>> it re-uses the same concepts from DT point of view.
>> The Tegra 124/210 X-USB subsystem contains of a host controller and a device
>> controller. Each controller have its own independent PM domain, but are being
>> partitioned across another shared PM domain for the USB super-speed logic.
>> Currently to make the drivers work, either the related PM domains needs to stay
>> powered on always or the PM domain topology needs to be in-correctly modelled
>> through sub-domains. In both cases PM domains may be powered on while they
>> don't need to be, so in the end this means - wasting power -.
>> As stated above, this series intends to address these problem from a PM
>> infrastructure point of view. More details are available in each changelog.
>> It should be noted that this series has been tested on HW, however only by using
>> a home-cooked test PM domain driver for genpd and together with a test driver.
>> This allowed me to play with PM domain (genpd), runtime PM and device links.
>> Any further deployment for real use cases are greatly appreciated. I am happy to
>> to help, if needed!
> Reviewed-by: Viresh Kumar <email@example.com>
prev parent reply other threads:[~2018-05-31 10:47 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-29 10:04 Ulf Hansson
2018-05-29 10:04 ` [PATCH v2 1/9] PM / Domains: Drop extern declarations of functions in pm_domain.h Ulf Hansson
2018-05-31 6:12 ` Viresh Kumar
2018-05-29 10:04 ` [PATCH v2 2/9] PM / Domains: Drop __pm_genpd_add_device() Ulf Hansson
2018-05-31 6:13 ` Viresh Kumar
2018-05-29 10:04 ` [PATCH v2 3/9] PM / Domains: Drop genpd as in-param for pm_genpd_remove_device() Ulf Hansson
2018-05-31 6:15 ` Viresh Kumar
2018-05-29 10:04 ` [PATCH v2 4/9] PM / Domains: Drop unused parameter in genpd_allocate_dev_data() Ulf Hansson
2018-05-31 6:16 ` Viresh Kumar
2018-05-29 10:04 ` [PATCH v2 5/9] PM / Domains: dt: Allow power-domain property to be a list of specifiers Ulf Hansson
2018-05-31 3:53 ` Rob Herring
2018-05-31 6:18 ` Viresh Kumar
2018-05-29 10:04 ` [PATCH v2 6/9] PM / Domains: Don't attach devices in genpd with multi PM domains Ulf Hansson
2018-05-30 16:06 ` Jon Hunter
2018-05-29 10:04 ` [PATCH v2 7/9] PM / Domains: Split genpd_dev_pm_attach() Ulf Hansson
2018-05-30 16:08 ` Jon Hunter
2018-05-31 7:04 ` Viresh Kumar
2018-05-29 10:04 ` [PATCH v2 8/9] PM / Domains: Add support for multi PM domains per device to genpd Ulf Hansson
2018-05-30 16:04 ` Jon Hunter
2018-05-31 6:17 ` Ulf Hansson
2018-05-31 8:03 ` Jon Hunter
2018-05-31 10:44 ` Ulf Hansson
2018-05-31 10:48 ` Jon Hunter
2018-05-29 10:04 ` [PATCH v2 9/9] PM / Domains: Add dev_pm_domain_attach_by_id() to manage multi PM domains Ulf Hansson
2018-05-30 9:19 ` Jon Hunter
2018-05-30 11:31 ` Ulf Hansson
2018-05-30 14:30 ` Jon Hunter
2018-06-27 8:55 ` Rajendra Nayak
2018-06-27 9:05 ` Ulf Hansson
2018-06-27 9:29 ` Rajendra Nayak
2018-05-30 9:30 ` [PATCH v2 0/9] PM / Domains: Add support for multi PM domains per device Rafael J. Wysocki
2018-05-30 11:34 ` Ulf Hansson
2018-05-31 9:14 ` Viresh Kumar
2018-05-31 10:47 ` Ulf Hansson [this message]
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