From: "Rafael J. Wysocki" <rafael@kernel.org>
To: "Luis R. Rodriguez" <mcgrof@kernel.org>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>,
Linux PM <linux-pm@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"open list:AMD IOMMU (AMD-VI)" <iommu@lists.linux-foundation.org>,
Linux Samsung SoC <linux-samsung-soc@vger.kernel.org>,
Joerg Roedel <joro@8bytes.org>, Inki Dae <inki.dae@samsung.com>,
Kukjin Kim <kgene@kernel.org>,
Krzysztof Kozlowski <krzk@kernel.org>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Mark Brown <broonie@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Tomeu Vizoso <tomeu.vizoso@collabora.com>,
Lukas Wunner <lukas@wunner.de>, Kevin Hilman <khilman@kernel.org>,
Tobias Jakobi <tjakobi@math.uni-bielefeld.de>,
Tomasz Figa <tomasz.figa@gmail.com>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
Lars-Peter Clausen <lars@metafoo.de>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Grant Likely <grant.likely@secretlab.ca>,
Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Subject: Re: [PATCH v6 7/7] iommu/exynos: Use device dependency links to control runtime pm
Date: Thu, 10 Nov 2016 00:42:51 +0100 [thread overview]
Message-ID: <CAJZ5v0h5e8OUmu2OCXDO0n1X+zuyJ97nd=aQy7f3p+QfSY_cEA@mail.gmail.com> (raw)
In-Reply-To: <20161109233126.GM13978@wotan.suse.de>
On Thu, Nov 10, 2016 at 12:31 AM, Luis R. Rodriguez <mcgrof@kernel.org> wrote:
> On Tue, Nov 08, 2016 at 02:29:24PM +0100, Marek Szyprowski wrote:
>> This patch uses recently introduced device dependency links to track the
>> runtime pm state of the master's device. The goal is to let SYSMMU
>> controller device's runtime PM to follow the runtime PM state of the
>> respective master's device. This way each SYSMMU controller is active
>> only when its master's device is active and can properly restore or save
>> its state instead on runtime PM transition of master's device.
>> This approach replaces old behavior, when SYSMMU controller was set to
>> runtime active once after attaching to the master device. In the new
>> approach SYSMMU controllers no longer prevents respective power domains
>> to be turned off when master's device is not being used.
>>
>> The dependency links also enforces proper order of suspending/restoring
>> devices during system sleep transition, so there is no more need to use
>> LATE_SYSTEM_SLEEP_PM_OPS-based workaround for ensuring that SYSMMUs are
>> suspended after their master devices.
>
> Patches 1-6 seems reasonable to me, however in so far as this patch is
> concerned I'd appreaciate if you and Rafael can reply to Lukas Wunner's
> questions.
Which questions exactly do you mean?
Thanks,
Rafael
prev parent reply other threads:[~2016-11-09 23:42 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20161108133014eucas1p2a5dd3306a464ee840e26532f6c405b66@eucas1p2.samsung.com>
2016-11-08 13:29 ` [PATCH v6 0/7] Exynos IOMMU: proper runtime PM support (use device dependencies) Marek Szyprowski
[not found] ` <CGME20161108133014eucas1p211e2f31b0091d22014c2a5940c3da1dd@eucas1p2.samsung.com>
2016-11-08 13:29 ` [PATCH v6 1/7] iommu/exynos: Remove excessive, useless debug Marek Szyprowski
[not found] ` <CGME20161108133015eucas1p234c8c7076bcda5020ae8b78e87a0203d@eucas1p2.samsung.com>
2016-11-08 13:29 ` [PATCH v6 2/7] iommu/exynos: Remove dead code Marek Szyprowski
[not found] ` <CGME20161108133016eucas1p27a25afd3a49bfc1e3e41c5a32e022f07@eucas1p2.samsung.com>
2016-11-08 13:29 ` [PATCH v6 3/7] iommu/exynos: Simplify internal enable/disable functions Marek Szyprowski
2016-11-10 16:40 ` Joerg Roedel
[not found] ` <CGME20161108133017eucas1p29e9dc833d57d4f7951d053dab8ba6bef@eucas1p2.samsung.com>
2016-11-08 13:29 ` [PATCH v6 4/7] iommu/exynos: Set master device once on boot Marek Szyprowski
[not found] ` <CGME20161108133017eucas1p28233851f230060cf91d31298bcf69e07@eucas1p2.samsung.com>
2016-11-08 13:29 ` [PATCH v6 5/7] iommu/exynos: Rework and fix internal locking Marek Szyprowski
[not found] ` <CGME20161108133018eucas1p27180e82ae25189bda573766251491e66@eucas1p2.samsung.com>
2016-11-08 13:29 ` [PATCH v6 6/7] iommu/exynos: Add runtime pm support Marek Szyprowski
[not found] ` <CGME20161108133019eucas1p1be275492ba670030324a164320866008@eucas1p1.samsung.com>
2016-11-08 13:29 ` [PATCH v6 7/7] iommu/exynos: Use device dependency links to control runtime pm Marek Szyprowski
2016-11-09 23:31 ` Luis R. Rodriguez
2016-11-09 23:42 ` Rafael J. Wysocki [this message]
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