From: Mika Westerberg <mika.westerberg-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
To: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Kevin Hilman <khilman-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Wolfram Sang <wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org>,
"Rafael J. Wysocki"
<rafael.j.wysocki-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
linux-acpi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Lv Zheng <lv.zheng-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
Aaron Lu <aaron.lu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
Dmitry Torokhov
<dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Mauro Carvalho Chehab
<m.chehab-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>,
Samuel Ortiz <sameo-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>,
Lee Jones <lee.jones-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>,
Greg Kroah-Hartman
<gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>,
Liam Girdwood <lgirdwood-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Kyungmin Park
<kyungmin.park-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
Subject: Re: [PATCH v2 1/9] i2c: prepare runtime PM support for I2C client devices
Date: Mon, 16 Sep 2013 17:38:12 +0300 [thread overview]
Message-ID: <20130916143811.GP7393@intel.com> (raw)
In-Reply-To: <20130916101249.GX29403-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
On Mon, Sep 16, 2013 at 11:12:49AM +0100, Mark Brown wrote:
> That's definitely an ACPI specific (probably x86 specific ACPI?)
> requirement not a generic one, on some systems it would increase power
> consumption since the controller will need to sit on while the device is
> functioning autonomously.
Yes, the ACPI 5.0 spec says that the device cannot be in higher D-state
than its parent. This is not x86 specific, though I'm not sure if this is
implemented elsewhere.
> Even though the controller power consumption is going to be minimal the
> power domain it is in may be relatively large. Can't the power domains
> for ACPI deal with this requirement, for example by making the I2C slave
> power domains children of the controller power domain?
We'll look into this. Thanks for the suggestion.
WARNING: multiple messages have this Message-ID (diff)
From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: Mark Brown <broonie@kernel.org>
Cc: Kevin Hilman <khilman@linaro.org>,
linux-i2c@vger.kernel.org, Wolfram Sang <wsa@the-dreams.de>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org,
Lv Zheng <lv.zheng@intel.com>, Aaron Lu <aaron.lu@intel.com>,
linux-arm-kernel@lists.infradead.org,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Mauro Carvalho Chehab <m.chehab@samsung.com>,
Samuel Ortiz <sameo@linux.intel.com>,
Lee Jones <lee.jones@linaro.org>, Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Liam Girdwood <lgirdwood@gmail.com>,
Kyungmin Park <kyungmin.park@samsung.com>
Subject: Re: [PATCH v2 1/9] i2c: prepare runtime PM support for I2C client devices
Date: Mon, 16 Sep 2013 17:38:12 +0300 [thread overview]
Message-ID: <20130916143811.GP7393@intel.com> (raw)
In-Reply-To: <20130916101249.GX29403@sirena.org.uk>
On Mon, Sep 16, 2013 at 11:12:49AM +0100, Mark Brown wrote:
> That's definitely an ACPI specific (probably x86 specific ACPI?)
> requirement not a generic one, on some systems it would increase power
> consumption since the controller will need to sit on while the device is
> functioning autonomously.
Yes, the ACPI 5.0 spec says that the device cannot be in higher D-state
than its parent. This is not x86 specific, though I'm not sure if this is
implemented elsewhere.
> Even though the controller power consumption is going to be minimal the
> power domain it is in may be relatively large. Can't the power domains
> for ACPI deal with this requirement, for example by making the I2C slave
> power domains children of the controller power domain?
We'll look into this. Thanks for the suggestion.
next prev parent reply other threads:[~2013-09-16 14:38 UTC|newest]
Thread overview: 126+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-11 15:32 [PATCH v2 0/9] runtime PM support for I2C and SPI client devices Mika Westerberg
2013-09-11 15:32 ` Mika Westerberg
2013-09-11 15:32 ` [PATCH v2 1/9] i2c: prepare runtime PM support for I2C " Mika Westerberg
2013-09-11 15:32 ` Mika Westerberg
2013-09-12 21:34 ` Kevin Hilman
2013-09-12 21:34 ` Kevin Hilman
[not found] ` <87vc25pvvm.fsf-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2013-09-12 21:40 ` Kevin Hilman
2013-09-12 21:40 ` Kevin Hilman
2013-09-12 21:40 ` Kevin Hilman
2013-09-13 6:54 ` Mika Westerberg
2013-09-13 9:59 ` Mark Brown
2013-09-13 9:59 ` Mark Brown
[not found] ` <20130913095950.GA29403-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2013-09-13 10:16 ` Mika Westerberg
2013-09-13 10:16 ` Mika Westerberg
2013-09-13 10:31 ` Mark Brown
2013-09-13 10:31 ` Mark Brown
[not found] ` <20130913103152.GE29403-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2013-09-13 11:50 ` Mika Westerberg
2013-09-13 11:50 ` Mika Westerberg
[not found] ` <20130913115035.GB7393-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2013-09-13 12:10 ` Mark Brown
2013-09-13 12:10 ` Mark Brown
2013-09-13 12:10 ` Mark Brown
2013-09-13 14:30 ` Kevin Hilman
2013-09-13 14:30 ` Kevin Hilman
2013-09-13 14:50 ` Mika Westerberg
[not found] ` <20130913145022.GC7393-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2013-09-13 17:31 ` Mika Westerberg
2013-09-13 17:31 ` Mika Westerberg
2013-09-13 21:10 ` Kevin Hilman
2013-09-13 21:10 ` Kevin Hilman
2013-09-15 6:41 ` Mika Westerberg
2013-09-15 12:47 ` Mark Brown
2013-09-15 12:47 ` Mark Brown
[not found] ` <20130915124744.GW29403-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2013-09-15 13:28 ` Mika Westerberg
2013-09-15 13:28 ` Mika Westerberg
2013-09-16 10:12 ` Mark Brown
2013-09-16 10:12 ` Mark Brown
[not found] ` <20130916101249.GX29403-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2013-09-16 14:38 ` Mika Westerberg [this message]
2013-09-16 14:38 ` Mika Westerberg
[not found] ` <20130916143811.GP7393-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2013-09-16 14:46 ` Graeme Gregory
2013-09-16 14:46 ` Graeme Gregory
2013-09-16 14:46 ` Graeme Gregory
2013-09-16 15:13 ` Mika Westerberg
2013-09-13 15:14 ` Sylwester Nawrocki
2013-09-13 15:14 ` Sylwester Nawrocki
[not found] ` <52332BF0.4060605-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
2013-09-13 15:40 ` Mika Westerberg
2013-09-13 15:40 ` Mika Westerberg
[not found] ` <20130913154013.GD7393-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2013-09-15 13:48 ` Sylwester Nawrocki
2013-09-15 13:48 ` Sylwester Nawrocki
2013-09-15 13:48 ` Sylwester Nawrocki
[not found] ` <5235BA9C.1090509-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-09-16 8:47 ` Mika Westerberg
2013-09-16 8:47 ` Mika Westerberg
2013-09-16 19:07 ` Rafael J. Wysocki
2013-09-16 19:07 ` Rafael J. Wysocki
[not found] ` <1861747.RtS0ZLgUUN-sKB8Sp2ER+y1GS7QM15AGw@public.gmane.org>
2013-09-16 23:31 ` Mark Brown
2013-09-16 23:31 ` Mark Brown
2013-09-16 23:31 ` Mark Brown
[not found] ` <20130916233111.GB21013-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2013-09-17 1:25 ` Rafael J. Wysocki
2013-09-17 1:25 ` Rafael J. Wysocki
2013-09-17 1:25 ` Rafael J. Wysocki
[not found] ` <1820315.QOOAzSjac3-sKB8Sp2ER+y1GS7QM15AGw@public.gmane.org>
2013-09-17 10:48 ` Mark Brown
2013-09-17 10:48 ` Mark Brown
2013-09-17 10:48 ` Mark Brown
2013-09-17 11:00 ` Mika Westerberg
2013-09-17 11:00 ` Mika Westerberg
[not found] ` <20130917110021.GU7393-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2013-09-17 21:38 ` Rafael J. Wysocki
2013-09-17 21:38 ` Rafael J. Wysocki
2013-09-17 21:38 ` Rafael J. Wysocki
[not found] ` <20130916084708.GN7393-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2013-09-17 11:07 ` Sylwester Nawrocki
2013-09-17 11:07 ` Sylwester Nawrocki
2013-09-17 11:07 ` Sylwester Nawrocki
2013-09-24 5:18 ` Mika Westerberg
2013-09-12 22:06 ` Sylwester Nawrocki
2013-09-12 22:06 ` Sylwester Nawrocki
2013-09-13 1:14 ` Aaron Lu
2013-09-13 1:14 ` Aaron Lu
[not found] ` <523266EC.1060501-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2013-09-13 10:02 ` Mark Brown
2013-09-13 10:02 ` Mark Brown
2013-09-13 10:02 ` Mark Brown
2013-09-11 15:32 ` [PATCH v2 2/9] i2c: attach/detach I2C client device to the ACPI power domain Mika Westerberg
2013-09-11 15:32 ` Mika Westerberg
2013-09-11 15:32 ` [PATCH v2 3/9] Input: misc - convert existing I2C client drivers to use I2C core runtime PM Mika Westerberg
2013-09-11 15:32 ` Mika Westerberg
2013-09-11 15:32 ` [PATCH v2 4/9] [media] s5p-tv: convert " Mika Westerberg
2013-09-11 15:32 ` Mika Westerberg
2013-09-11 15:32 ` [PATCH v2 5/9] drivers/misc: convert existing I2C clients driver " Mika Westerberg
2013-09-11 15:32 ` Mika Westerberg
2013-09-12 21:29 ` Greg Kroah-Hartman
2013-09-12 21:29 ` Greg Kroah-Hartman
2013-09-11 15:32 ` [PATCH v2 6/9] mfd: wm8994: convert " Mika Westerberg
2013-09-11 15:32 ` Mika Westerberg
2013-09-11 16:12 ` Samuel Ortiz
2013-09-11 16:12 ` Samuel Ortiz
2013-09-12 9:24 ` Mika Westerberg
[not found] ` <20130912092447.GJ7393-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2013-09-12 9:28 ` Samuel Ortiz
2013-09-12 9:28 ` Samuel Ortiz
2013-09-12 9:28 ` Samuel Ortiz
2013-09-11 15:32 ` [PATCH v2 7/9] ASoC: codecs: convert existing I2C client drivers " Mika Westerberg
2013-09-11 15:32 ` Mika Westerberg
[not found] ` <1378913560-2752-8-git-send-email-mika.westerberg-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2013-09-11 15:44 ` Mark Brown
2013-09-11 15:44 ` Mark Brown
2013-09-11 15:44 ` Mark Brown
2013-09-11 15:32 ` [PATCH v2 8/9] spi: prepare runtime PM support for SPI devices Mika Westerberg
2013-09-11 15:32 ` Mika Westerberg
[not found] ` <1378913560-2752-9-git-send-email-mika.westerberg-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2013-09-11 15:51 ` Mark Brown
2013-09-11 15:51 ` Mark Brown
2013-09-11 15:51 ` Mark Brown
2013-09-12 9:27 ` Mika Westerberg
[not found] ` <20130912092743.GK7393-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2013-09-12 9:31 ` Mark Brown
2013-09-12 9:31 ` Mark Brown
2013-09-12 9:31 ` Mark Brown
[not found] ` <20130912093145.GA29403-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2013-09-12 9:43 ` Mika Westerberg
2013-09-12 9:43 ` Mika Westerberg
2013-09-12 11:04 ` Rafael J. Wysocki
2013-09-12 11:04 ` Rafael J. Wysocki
2013-09-12 11:04 ` Wolfram Sang
2013-09-12 11:04 ` Wolfram Sang
2013-09-12 12:20 ` Mika Westerberg
2013-09-12 12:20 ` Mika Westerberg
[not found] ` <14222641.vVF4lKBqCB-sKB8Sp2ER+y1GS7QM15AGw@public.gmane.org>
2013-09-12 12:25 ` Mika Westerberg
2013-09-12 12:25 ` Mika Westerberg
2013-09-11 15:32 ` [PATCH v2 9/9] spi: attach/detach SPI device to the ACPI power domain Mika Westerberg
2013-09-11 15:32 ` Mika Westerberg
2013-09-11 15:51 ` Mark Brown
2013-09-11 15:51 ` Mark Brown
[not found] ` <1378913560-2752-1-git-send-email-mika.westerberg-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2013-09-11 15:53 ` [PATCH v2 0/9] runtime PM support for I2C and SPI client devices Mark Brown
2013-09-11 15:53 ` Mark Brown
2013-09-11 15:53 ` Mark Brown
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