From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Locke Subject: Re: nokia 770 [was Re: community PM requirements/issues and PowerOP] Date: Wed, 13 Dec 2006 13:27:35 -0800 Message-ID: <95FB331B-DBAC-4DF9-8F2D-4EBB0FF24635@comcast.net> References: <20060914101704.GA17820@elf.ucw.cz> <1158583334.28629.19.camel@localhost> <20060919182523.GE7099@elf.ucw.cz> <200612121200.18513.david-b@pacbell.net> Mime-Version: 1.0 (Apple Message framework v752.2) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <200612121200.18513.david-b@pacbell.net> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-pm-bounces@lists.osdl.org Errors-To: linux-pm-bounces@lists.osdl.org To: David Brownell Cc: scott.preece@motorola.com, linux-pm@lists.osdl.org, Pavel Machek , Amit Kucheria List-Id: linux-pm@vger.kernel.org On Dec 12, 2006, at 12:00 PM, David Brownell wrote: > On Tuesday 19 September 2006 11:25 am, Pavel Machek wrote: >> >> Could you perhaps provide list of operating points for 770? It would >> help understanding a bit, I'd say. > > If there was a followup here, I missed it ... I think there was some sort of followup but I don't think it = explictly listed the operating point values. > > ISTR that it doesn't use (formal) operating points, and that a lot = > of the > basic SOC power savings (vs powering off the display or wifi) come = > from a > different kind of mechanism entirely. Namely, a combination of = > dynamic > tick with a modified system idle task, which enters one of the OMAP = > low > power modes during those long periods between clock ticks or other = > irqs. > > That's one of the standard power saving schemes used on OMAP1 = > platforms > with Linux. Well sure but I think this discussion was about using the 770 as a = specific example of operating point values. Here are the operating = points used on omap1. The board specific part is just whether or not = the board has a scalable voltage regulator. Omap1 has a fairly = simple operating point definition and is, of course, not the latest h/w. This table comes from the DPM implementation on OMAP1 and is = expressed as dividers. Name Voltage, DPLL multiplier, DPLL divider, cpu divider, tc divider = (mem bus). 192 1300 16 1 1 2 168 1300 14 1 1 2 84 1300 14 1 2 2 84-1.1v 1050 14 1 2 2 60 1300 5 1 1 1 60-1.1v 1050 5 1 1 1 sleep-168 1300 14 1 0 -1 sleep-60 1300 1 2 0 2 Several other parameters could be added such as dsp and dsp mmu if = one wanted to do more aggressive power management. btw, the = parameter names I list above are from memory so I might have the = order mixed up but you get the idea. The dpm utilities on sf.net also include 8 example operating points = for pxa272. The operating point definition on pxa has ~5 parameters = including voltage, cpu frequency and other clocks. > > - Dave > _______________________________________________ > linux-pm mailing list > linux-pm@lists.osdl.org > https://lists.osdl.org/mailman/listinfo/linux-pm