From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755967AbcI0WOO (ORCPT ); Tue, 27 Sep 2016 18:14:14 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:45811 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751913AbcI0WOE (ORCPT ); Tue, 27 Sep 2016 18:14:04 -0400 DMARC-Filter: OpenDMARC Filter v1.3.1 smtp.codeaurora.org 4CC4561769 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=pass smtp.mailfrom=sboyd@codeaurora.org Date: Tue, 27 Sep 2016 15:14:01 -0700 From: Stephen Boyd To: Heiko Stuebner Cc: Viresh Kumar , Finlye Xiao , srinivas.kandagatla@linaro.org, maxime.ripard@free-electrons.com, robh+dt@kernel.org, frowand.list@gmail.com, sre@kernel.org, dbaryshkov@gmail.com, dwmw2@infradead.org, mark.rutland@arm.com, khilman@kernel.org, nm@ti.com, rjw@rjwysocki.net, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, wxt@rock-chips.com, jay.xu@rock-chips.com, rocky.hao@rock-chips.com, tim.chen@rock-chips.com, tony.xie@rock-chips.com, ulysses.huang@rock-chips.com, lin.huang@rock-chips.com Subject: Re: [PATCH v2 4/4] PM / AVS: rockchip-cpu-avs: add driver handling Rockchip cpu avs Message-ID: <20160927221401.GA940@codeaurora.org> References: <1471510341-63926-1-git-send-email-finley.xiao@rock-chips.com> <20160912215515.GF7243@codeaurora.org> <20160926035511.GG17336@vireshk-i7> <20776501.pZ2NDOzLK3@phil> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20776501.pZ2NDOzLK3@phil> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 09/26, Heiko Stuebner wrote: > Am Montag, 26. September 2016, 09:25:11 CEST schrieb Viresh Kumar: > > On 12-09-16, 14:55, Stephen Boyd wrote: > > > On 08/29, Viresh Kumar wrote: > > > > On 18-08-16, 16:52, Finlye Xiao wrote: > > > > > +static int rockchip_adjust_opp_table(struct device *cpu_dev, > > > > > + struct cpufreq_frequency_table *table, > > > > > + int volt) > > > > > +{ > > > > > + struct opp_table *opp_table; > > > > > + struct cpufreq_frequency_table *pos; > > > > > + struct dev_pm_opp *opp; > > > > > + > > > > > + if (!volt) > > > > > + return 0; > > > > > + > > > > > + rcu_read_lock(); > > > > > + > > > > > + opp_table = _find_opp_table(cpu_dev); > > > > > + if (IS_ERR(opp_table)) { > > > > > + rcu_read_unlock(); > > > > > + return PTR_ERR(opp_table); > > > > > + } > > > > > + > > > > > + cpufreq_for_each_valid_entry(pos, table) { > > > > > + opp = dev_pm_opp_find_freq_exact(cpu_dev, pos->frequency * 1000, > > > > > + true); > > > > > + if (IS_ERR(opp)) > > > > > + continue; > > > > > + > > > > > + opp->u_volt += volt; > > > > > + opp->u_volt_min += volt; > > > > > + opp->u_volt_max += volt; > > > > > + } > > > > > + > > > > > + rcu_read_unlock(); > > > > > + > > > > > + return 0; > > > > > +} > > > > > > > > I wouldn't prefer altering the opp tables from individual drivers at > > > > all. At the least, it should be done via some helpers exposed by the > > > > core. > > > > > > > > But before that I would like to hear from Stephen a bit as I recall he > > > > was also working on something similar. > > > > > > I had a patch to modify the voltage at runtime for the "current" > > > OPP. Now that we have regulator and clk control inside OPP that > > > became a little easier to do without having to do some notifier > > > from the OPP layer to the consumers. I haven't had time to revive > > > those patches though. Should we do that? > > > > Perhaps yes, we should have a common place for doing all that. > > > > > Does this need to modify > > > anything besides the OPP the device is currently running at? > > > > Finlye, can you please answer this ? > > If I understand it correctly, depending on the leakage value stored in an > efuse, all opp voltages are reduced by a certain value. Right now the driver > does it in one go for the full opp table, but of course could also do it for > each new opp individually before it gets set. Ok. Well either way that sounds fine. We could expose an API to change each voltage and an API to change the current voltage and update the table. -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project From mboxrd@z Thu Jan 1 00:00:00 1970 From: sboyd@codeaurora.org (Stephen Boyd) Date: Tue, 27 Sep 2016 15:14:01 -0700 Subject: [PATCH v2 4/4] PM / AVS: rockchip-cpu-avs: add driver handling Rockchip cpu avs In-Reply-To: <20776501.pZ2NDOzLK3@phil> References: <1471510341-63926-1-git-send-email-finley.xiao@rock-chips.com> <20160912215515.GF7243@codeaurora.org> <20160926035511.GG17336@vireshk-i7> <20776501.pZ2NDOzLK3@phil> Message-ID: <20160927221401.GA940@codeaurora.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 09/26, Heiko Stuebner wrote: > Am Montag, 26. September 2016, 09:25:11 CEST schrieb Viresh Kumar: > > On 12-09-16, 14:55, Stephen Boyd wrote: > > > On 08/29, Viresh Kumar wrote: > > > > On 18-08-16, 16:52, Finlye Xiao wrote: > > > > > +static int rockchip_adjust_opp_table(struct device *cpu_dev, > > > > > + struct cpufreq_frequency_table *table, > > > > > + int volt) > > > > > +{ > > > > > + struct opp_table *opp_table; > > > > > + struct cpufreq_frequency_table *pos; > > > > > + struct dev_pm_opp *opp; > > > > > + > > > > > + if (!volt) > > > > > + return 0; > > > > > + > > > > > + rcu_read_lock(); > > > > > + > > > > > + opp_table = _find_opp_table(cpu_dev); > > > > > + if (IS_ERR(opp_table)) { > > > > > + rcu_read_unlock(); > > > > > + return PTR_ERR(opp_table); > > > > > + } > > > > > + > > > > > + cpufreq_for_each_valid_entry(pos, table) { > > > > > + opp = dev_pm_opp_find_freq_exact(cpu_dev, pos->frequency * 1000, > > > > > + true); > > > > > + if (IS_ERR(opp)) > > > > > + continue; > > > > > + > > > > > + opp->u_volt += volt; > > > > > + opp->u_volt_min += volt; > > > > > + opp->u_volt_max += volt; > > > > > + } > > > > > + > > > > > + rcu_read_unlock(); > > > > > + > > > > > + return 0; > > > > > +} > > > > > > > > I wouldn't prefer altering the opp tables from individual drivers at > > > > all. At the least, it should be done via some helpers exposed by the > > > > core. > > > > > > > > But before that I would like to hear from Stephen a bit as I recall he > > > > was also working on something similar. > > > > > > I had a patch to modify the voltage at runtime for the "current" > > > OPP. Now that we have regulator and clk control inside OPP that > > > became a little easier to do without having to do some notifier > > > from the OPP layer to the consumers. I haven't had time to revive > > > those patches though. Should we do that? > > > > Perhaps yes, we should have a common place for doing all that. > > > > > Does this need to modify > > > anything besides the OPP the device is currently running at? > > > > Finlye, can you please answer this ? > > If I understand it correctly, depending on the leakage value stored in an > efuse, all opp voltages are reduced by a certain value. Right now the driver > does it in one go for the full opp table, but of course could also do it for > each new opp individually before it gets set. Ok. Well either way that sounds fine. We could expose an API to change each voltage and an API to change the current voltage and update the table. -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project