From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tero Kristo Subject: Re: Cpufreq regression in next-20161207 Date: Thu, 8 Dec 2016 10:54:06 +0200 Message-ID: References: <20161208045640.GB4264@atomide.com> <20161208050739.GE24152@vireshk-i7> <20161208055220.GD4264@atomide.com> <20161208055738.GB31711@vireshk-i7> <20161208060447.GE4264@atomide.com> Mime-Version: 1.0 Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from fllnx209.ext.ti.com ([198.47.19.16]:49386 "EHLO fllnx209.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750851AbcLHIyP (ORCPT ); Thu, 8 Dec 2016 03:54:15 -0500 In-Reply-To: <20161208060447.GE4264@atomide.com> Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: Tony Lindgren , Viresh Kumar Cc: "Rafael J. Wysocki" , Stephen Boyd , Dave Gerlach , Nishanth Menon , linux-pm@vger.kernel.org, linux-omap@vger.kernel.org On 08/12/16 08:04, Tony Lindgren wrote: > * Viresh Kumar [161207 21:58]: >> On 07-12-16, 21:52, Tony Lindgren wrote: >>> Hmm good question. Maybe we don't have the regulators configured for >>> pandaboard? >> >> Hmm, and who would be the right person to confirm that? And its not only about >> pandaboard but the whole OMAP4 family (which is using cpufreq-dt driver). > > Nishanth and Dave in Cc should be able to confirm. Most likely it's some > missing .config option for the regulators in multi_v7_defconfig compared > to omap2plus_defconfig though. > > Regards, > > Tony Pandaboard has a weird configuration, where MPU VDD is controlled by a separate component; TPS62361, but rest of the voltages are provided by TWL6030. The support for this was attempted to be upstreamed along with the required changes for the VC/VP framework under mach-omap2, but this was never accepted. I'm not sure but I recall it wasn't possible to control the MPU voltage via the default I2C interface, instead you had to use the VC/VP path, which isn't fully implemented for OMAP4. As a consequence, none of the OMAP4 boards have a properly functioning MPU voltage supply control in place and you will rely on u-boot provided voltages. -Tero