From mboxrd@z Thu Jan 1 00:00:00 1970 From: Linus Walleij Date: Wed, 14 Dec 2011 15:50:53 +0000 Subject: Re: [PATCH/RFC] mmc: add a device PM QoS constraint when a host is Message-Id: List-Id: References: <4EE865CA.8000407@stericsson.com> <201112141128.56029.rjw@sisk.pl> In-Reply-To: <201112141128.56029.rjw@sisk.pl> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable To: "Rafael J. Wysocki" Cc: Ulf Hansson , Guennadi Liakhovetski , "linux-mmc@vger.kernel.org" , "linux-pm@vger.kernel.org" , Chris Ball , "linux-sh@vger.kernel.org" On Wed, Dec 14, 2011 at 11:28 AM, Rafael J. Wysocki 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. =A0The 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". =A0[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.] =A0It 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 Thanks, Linus Walleij From mboxrd@z Thu Jan 1 00:00:00 1970 From: Linus Walleij 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 Message-ID: References: <4EE865CA.8000407@stericsson.com> <201112141128.56029.rjw@sisk.pl> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <201112141128.56029.rjw@sisk.pl> Sender: linux-sh-owner@vger.kernel.org To: "Rafael J. Wysocki" Cc: Ulf Hansson , Guennadi Liakhovetski , "linux-mmc@vger.kernel.org" , "linux-pm@vger.kernel.org" , Chris Ball , "linux-sh@vger.kernel.org" List-Id: linux-mmc@vger.kernel.org On Wed, Dec 14, 2011 at 11:28 AM, Rafael J. Wysocki 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. =A0The exact meaning of this number = is: > "I may want to use the device 100 us from now (but not earlier), so p= lease > make it possible to do that". =A0[It roughly means "don't put the dev= ice into > a low-power state that takes more than 100 us to resume from", but it= 's a bit > more complicated than that.] =A0It doesn't mean "don't suspend the de= vice for > the next 100 us". Yes you're right, I get it now! Thanks for the explanation Rafael. Acked-by: Linus Walleij Thanks, Linus Walleij