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From: Linus Walleij <linus.walleij@linaro.org>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Ulf Hansson <ulf.hansson@stericsson.com>,
	Guennadi Liakhovetski <g.liakhovetski@gmx.de>,
	"linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
	"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
	Chris Ball <cjb@laptop.org>,
	"linux-sh@vger.kernel.org" <linux-sh@vger.kernel.org>
Subject: Re: [PATCH/RFC] mmc: add a device PM QoS constraint when a host is
Date: Wed, 14 Dec 2011 15:50:53 +0000	[thread overview]
Message-ID: <CACRpkdavEN4Ht425a5P9JfLttCqZ94-yH11GbxgV+mhvwHzGLA@mail.gmail.com> (raw)
In-Reply-To: <201112141128.56029.rjw@sisk.pl>

On Wed, Dec 14, 2011 at 11:28 AM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> On Wednesday, December 14, 2011, Linus Walleij wrote:

>> But this delta is dependent on a lot of stuff that only the platform
>> knows, like nominal CPU frequency, bus speed etc, so certainly the
>> platform must be able to modify that number.
>
> You seem to be confusing things.  The exact meaning of this number is:
> "I may want to use the device 100 us from now (but not earlier), so please
> make it possible to do that".  [It roughly means "don't put the device into
> a low-power state that takes more than 100 us to resume from", but it's a bit
> more complicated than that.]  It doesn't mean "don't suspend the device for
> the next 100 us".

Yes you're right, I get it now!

Thanks for the explanation Rafael.

Acked-by: Linus Walleij <linus.walleij@linaro.org>

Thanks,
Linus Walleij

WARNING: multiple messages have this Message-ID (diff)
From: Linus Walleij <linus.walleij@linaro.org>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Ulf Hansson <ulf.hansson@stericsson.com>,
	Guennadi Liakhovetski <g.liakhovetski@gmx.de>,
	"linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
	"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
	Chris Ball <cjb@laptop.org>,
	"linux-sh@vger.kernel.org" <linux-sh@vger.kernel.org>
Subject: Re: [PATCH/RFC] mmc: add a device PM QoS constraint when a host is first claimed
Date: Wed, 14 Dec 2011 16:50:53 +0100	[thread overview]
Message-ID: <CACRpkdavEN4Ht425a5P9JfLttCqZ94-yH11GbxgV+mhvwHzGLA@mail.gmail.com> (raw)
In-Reply-To: <201112141128.56029.rjw@sisk.pl>

On Wed, Dec 14, 2011 at 11:28 AM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> On Wednesday, December 14, 2011, Linus Walleij wrote:

>> But this delta is dependent on a lot of stuff that only the platform
>> knows, like nominal CPU frequency, bus speed etc, so certainly the
>> platform must be able to modify that number.
>
> You seem to be confusing things.  The exact meaning of this number is:
> "I may want to use the device 100 us from now (but not earlier), so please
> make it possible to do that".  [It roughly means "don't put the device into
> a low-power state that takes more than 100 us to resume from", but it's a bit
> more complicated than that.]  It doesn't mean "don't suspend the device for
> the next 100 us".

Yes you're right, I get it now!

Thanks for the explanation Rafael.

Acked-by: Linus Walleij <linus.walleij@linaro.org>

Thanks,
Linus Walleij

  reply	other threads:[~2011-12-14 15:50 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-12-12 15:46 [PATCH/RFC] mmc: add a device PM QoS constraint when a host is first Guennadi Liakhovetski
2011-12-12 15:46 ` [PATCH/RFC] mmc: add a device PM QoS constraint when a host is first claimed Guennadi Liakhovetski
2011-12-13 15:18 ` [PATCH/RFC] mmc: add a device PM QoS constraint when a host is Ulf Hansson
2011-12-13 15:18   ` [PATCH/RFC] mmc: add a device PM QoS constraint when a host is first claimed Ulf Hansson
2011-12-13 16:13   ` [PATCH/RFC] mmc: add a device PM QoS constraint when a host is Guennadi Liakhovetski
2011-12-13 16:13     ` [PATCH/RFC] mmc: add a device PM QoS constraint when a host is first claimed Guennadi Liakhovetski
2011-12-13 21:08     ` Rafael J. Wysocki
2011-12-13 21:08       ` Rafael J. Wysocki
2011-12-14  9:00     ` [PATCH/RFC] mmc: add a device PM QoS constraint when a host is Ulf Hansson
2011-12-14  9:00       ` [PATCH/RFC] mmc: add a device PM QoS constraint when a host is first claimed Ulf Hansson
2011-12-14  9:27       ` [PATCH/RFC] mmc: add a device PM QoS constraint when a host is Linus Walleij
2011-12-14  9:27         ` [PATCH/RFC] mmc: add a device PM QoS constraint when a host is first claimed Linus Walleij
2011-12-14 10:28         ` Rafael J. Wysocki
2011-12-14 10:28           ` Rafael J. Wysocki
2011-12-14 15:50           ` Linus Walleij [this message]
2011-12-14 15:50             ` Linus Walleij
2011-12-14 10:15       ` Rafael J. Wysocki
2011-12-14 10:15         ` Rafael J. Wysocki
2011-12-14 11:12         ` [PATCH/RFC] mmc: add a device PM QoS constraint when a host is Ulf Hansson
2011-12-14 11:12           ` [PATCH/RFC] mmc: add a device PM QoS constraint when a host is first claimed Ulf Hansson
2011-12-14 21:36           ` Rafael J. Wysocki
2011-12-14 21:36             ` Rafael J. Wysocki
2011-12-16  9:14             ` [PATCH/RFC] mmc: add a device PM QoS constraint when a host is Guennadi Liakhovetski
2011-12-16  9:14               ` [PATCH/RFC] mmc: add a device PM QoS constraint when a host is first claimed Guennadi Liakhovetski
2011-12-19 12:17               ` [PATCH/RFC] mmc: add a device PM QoS constraint when a host is Ulf Hansson
2011-12-19 12:17                 ` [PATCH/RFC] mmc: add a device PM QoS constraint when a host is first claimed Ulf Hansson
2012-03-03 20:53                 ` Rafael J. Wysocki
2012-03-03 20:53                   ` Rafael J. Wysocki

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