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[23.128.96.18]) by mx.google.com with ESMTP id n12si10382835iob.27.2021.07.16.02.32.09; Fri, 16 Jul 2021 02:32:22 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@mg.codeaurora.org header.s=smtp header.b=NnZu2hw7; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231131AbhGPJdJ (ORCPT + 99 others); Fri, 16 Jul 2021 05:33:09 -0400 Received: from m43-7.mailgun.net ([69.72.43.7]:54216 "EHLO m43-7.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233786AbhGPJdA (ORCPT ); Fri, 16 Jul 2021 05:33:00 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1626427805; h=Content-Transfer-Encoding: Content-Type: In-Reply-To: MIME-Version: Date: Message-ID: From: References: Cc: To: Subject: Sender; bh=QfX1cy6BRq8atEmaeOQYNQ5ZME2FA2z59j0zFsixeDI=; b=NnZu2hw7JchNjluXKqJGgcIusEzYCrMh4N7UUVUhRRV+4/hcGfuvuOoJ+LV7dr9d8kiWhVjx NL5oiNi9eKwDAy8iONORmJOR8iTt0jRhlo9au8MvqME7zisEwTq0nslfKdsp1mZzF2cjf2eQ DK6roMF4RRpGkCTLnUtePLsFkMM= X-Mailgun-Sending-Ip: 69.72.43.7 X-Mailgun-Sid: WyI0MWYwYSIsICJsaW51eC1rZXJuZWxAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n03.prod.us-east-1.postgun.com with SMTP id 60f1519c4815712f3a982b47 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Fri, 16 Jul 2021 09:30:04 GMT Sender: rnayak=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 18BCBC43460; Fri, 16 Jul 2021 09:30:04 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-caf-mail-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=ALL_TRUSTED,BAYES_00, NICE_REPLY_A,SPF_FAIL,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from [10.50.2.235] (blr-bdr-fw-01_GlobalNAT_AllZones-Outside.qualcomm.com [103.229.18.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: rnayak) by smtp.codeaurora.org (Postfix) with ESMTPSA id 2947CC433D3; Fri, 16 Jul 2021 09:29:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 2947CC433D3 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=rnayak@codeaurora.org Subject: Re: [PATCH v3 1/2] PM / Domains: Add support for 'required-opps' to set default perf state To: ulf.hansson@linaro.org, bjorn.andersson@linaro.org, viresh.kumar@linaro.org Cc: linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, swboyd@chromium.org, rojay@codeaurora.org, stephan@gerhold.net References: <1626412425-30715-1-git-send-email-rnayak@codeaurora.org> <1626412425-30715-2-git-send-email-rnayak@codeaurora.org> From: Rajendra Nayak Message-ID: <60c91d5b-21d3-fed8-853d-c89bc08160d2@codeaurora.org> Date: Fri, 16 Jul 2021 14:59:57 +0530 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <1626412425-30715-2-git-send-email-rnayak@codeaurora.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 7/16/2021 10:43 AM, Rajendra Nayak wrote: > Some devics within power domains with performance states do not > support DVFS, but still need to vote on a default/static state > while they are active. They can express this using the 'required-opps' > property in device tree, which points to the phandle of the OPP > supported by the corresponding power-domains. > > Add support to parse this information from DT and then set the > specified performance state during attach and drop it on detach. > Also drop/set as part of runtime suspend/resume callbacks. > > Signed-off-by: Rajendra Nayak > --- > drivers/base/power/domain.c | 29 ++++++++++++++++++++++++++++- > include/linux/pm_domain.h | 1 + > 2 files changed, 29 insertions(+), 1 deletion(-) > > diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c > index a934c67..eef5507 100644 > --- a/drivers/base/power/domain.c > +++ b/drivers/base/power/domain.c > @@ -917,6 +917,10 @@ static int genpd_runtime_suspend(struct device *dev) > if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) > return 0; > > + /* Drop the default performance state */ > + if (dev_gpd_data(dev)->default_pstate) > + dev_pm_genpd_set_performance_state(dev, 0); > + > genpd_lock(genpd); > gpd_data->rpm_pstate = genpd_drop_performance_state(dev); > genpd_power_off(genpd, true, 0); > @@ -937,6 +941,7 @@ static int genpd_runtime_resume(struct device *dev) > { > struct generic_pm_domain *genpd; > struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev); > + unsigned int default_pstate = gpd_data->default_pstate; > struct gpd_timing_data *td = &gpd_data->td; > bool runtime_pm = pm_runtime_enabled(dev); > ktime_t time_start; > @@ -968,6 +973,9 @@ static int genpd_runtime_resume(struct device *dev) > if (ret) > return ret; > > + /* Set the default performance state */ > + if (default_pstate) > + dev_pm_genpd_set_performance_state(dev, default_pstate); > out: > /* Measure resume latency. */ > time_start = 0; > @@ -1000,6 +1008,8 @@ static int genpd_runtime_resume(struct device *dev) > genpd_stop_dev(genpd, dev); > err_poweroff: > if (!pm_runtime_is_irq_safe(dev) || genpd_is_irq_safe(genpd)) { > + if (default_pstate) > + dev_pm_genpd_set_performance_state(dev, 0); > genpd_lock(genpd); > gpd_data->rpm_pstate = genpd_drop_performance_state(dev); > genpd_power_off(genpd, true, 0); > @@ -2598,6 +2608,12 @@ static void genpd_dev_pm_detach(struct device *dev, bool power_off) > > dev_dbg(dev, "removing from PM domain %s\n", pd->name); > > + /* Drop the default performance state */ > + if (dev_gpd_data(dev)->default_pstate) { > + dev_pm_genpd_set_performance_state(dev, 0); > + dev_gpd_data(dev)->default_pstate = 0; > + } > + > for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { > ret = genpd_remove_device(pd, dev); > if (ret != -EAGAIN) > @@ -2635,9 +2651,10 @@ static void genpd_dev_pm_sync(struct device *dev) > static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev, > unsigned int index, bool power_on) > { > + struct device_node *np; > struct of_phandle_args pd_args; > struct generic_pm_domain *pd; > - int ret; > + int ret, pstate; > > ret = of_parse_phandle_with_args(dev->of_node, "power-domains", > "#power-domain-cells", index, &pd_args); > @@ -2678,6 +2695,16 @@ static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev, > if (ret) > genpd_remove_device(pd, dev); > > + /* Set the default performance state */ > + np = base_dev->of_node; > + if (of_parse_phandle(np, "required-opps", index)) { > + pstate = of_get_required_opp_performance_state(np, index); > + if (pstate > 0) { > + dev_pm_genpd_set_performance_state(dev, pstate); > + dev_gpd_data(dev)->default_pstate = pstate; > + } > + } I realized this needs better error handling after I sent it out, I'll fix and respin. > + > return ret ? -EPROBE_DEFER : 1; > } > > diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h > index 21a0577..67017c9 100644 > --- a/include/linux/pm_domain.h > +++ b/include/linux/pm_domain.h > @@ -198,6 +198,7 @@ struct generic_pm_domain_data { > struct notifier_block *power_nb; > int cpu; > unsigned int performance_state; > + unsigned int default_pstate; > unsigned int rpm_pstate; > ktime_t next_wakeup; > void *data; > -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation