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Thu, 19 Nov 2020 05:43:04 -0800 Received: from MTKMBS01N1.mediatek.inc (172.21.101.68) by MTKMBS62DR.mediatek.inc (172.29.94.18) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 19 Nov 2020 05:40:32 -0800 Received: from mtkcas10.mediatek.inc (172.21.101.39) by mtkmbs01n1.mediatek.inc (172.21.101.68) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 19 Nov 2020 21:40:18 +0800 Received: from [172.21.77.33] (172.21.77.33) by mtkcas10.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 19 Nov 2020 21:40:18 +0800 Message-ID: <1605793218.20463.5.camel@mtkswgap22> Subject: Re: [PATCH v8 1/3] cpufreq: mediatek-hw: Add support for CPUFREQ HW From: Hector Yuan To: Lukasz Luba Date: Thu, 19 Nov 2020 21:40:18 +0800 In-Reply-To: <9382b917-f20d-c7b5-42e4-46d11465073f@arm.com> References: <1603700349-5922-1-git-send-email-hector.yuan@mediatek.com> <1603700349-5922-2-git-send-email-hector.yuan@mediatek.com> <9382b917-f20d-c7b5-42e4-46d11465073f@arm.com> X-Mailer: Evolution 3.2.3-0ubuntu6 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201119_084311_770837_22E772F3 X-CRM114-Status: GOOD ( 21.25 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Ulf Hansson , Florian Fainelli , wsd_upstream@mediatek.com, Dave Gerlach , linux-pm@vger.kernel.org, Stephen Boyd , Viresh Kumar , Santosh Shilimkar , "Rafael J. Wysocki" , linux-kernel@vger.kernel.org, Maxime Ripard , Rob Herring , linux-mediatek@lists.infradead.org, Amit Kucheria , Sudeep Holla , Lorenzo Pieralisi , Robin Murphy , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org On Thu, 2020-11-19 at 12:41 +0000, Lukasz Luba wrote: > Hi Hector, > > On 10/26/20 8:19 AM, Hector Yuan wrote: > > From: "Hector.Yuan" > > > > Add cpufreq HW support. > > > > Signed-off-by: Hector.Yuan > > [snip] > > > + > > +static int mtk_cpufreq_hw_cpu_init(struct cpufreq_policy *policy) > > +{ > > + struct cpufreq_mtk *c; > > + struct device *cpu_dev; > > + struct em_data_callback em_cb = EM_DATA_CB(mtk_cpufreq_get_cpu_power); > > + struct pm_qos_request *qos_request; > > + int sig, pwr_hw = CPUFREQ_HW_STATUS | SVS_HW_STATUS; > > + > > + qos_request = kzalloc(sizeof(*qos_request), GFP_KERNEL); > > + if (!qos_request) > > + return -ENOMEM; > > + > > + cpu_dev = get_cpu_device(policy->cpu); > > + if (!cpu_dev) { > > + pr_err("failed to get cpu%d device\n", policy->cpu); > > + return -ENODEV; > > + } > > + > > + c = mtk_freq_domain_map[policy->cpu]; > > + if (!c) { > > + pr_err("No scaling support for CPU%d\n", policy->cpu); > > + return -ENODEV; > > + } > > + > > + cpumask_copy(policy->cpus, &c->related_cpus); > > + > > + policy->freq_table = c->table; > > + policy->driver_data = c; > > To control frequency transition rate in schedutil, you might > be interested in setting: > > policy->cpuinfo.transition_latency = ; > > Example, when this latency value comes from FW [1] > OK, I will add it in v9. > > + > > + /* Let CPUs leave idle-off state for SVS CPU initializing */ > > + cpu_latency_qos_add_request(qos_request, 0); > > + > > + /* HW should be in enabled state to proceed now */ > > + writel_relaxed(0x1, c->reg_bases[REG_FREQ_ENABLE]); > > + > > + if (readl_poll_timeout(c->reg_bases[REG_FREQ_HW_STATE], sig, > > + (sig & pwr_hw) == pwr_hw, POLL_USEC, > > + TIMEOUT_USEC)) { > > + if (!(sig & CPUFREQ_HW_STATUS)) { > > + pr_info("cpufreq hardware of CPU%d is not enabled\n", > > + policy->cpu); > > + return -ENODEV; > > + } > > + > > + pr_info("SVS of CPU%d is not enabled\n", policy->cpu); > > + } > > + > > + em_dev_register_perf_domain(cpu_dev, c->nr_opp, &em_cb, policy->cpus); > > Please keep in mind that this is going to be changed soon with a new > argument: 'milliwatts'. It's queued in pm/linux-next [2]. > OK, thanks for the remind. > Regards, > Lukasz > > [1] > https://elixir.bootlin.com/linux/latest/source/drivers/cpufreq/scmi-cpufreq.c#L194 > [2] > https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git/commit/?h=linux-next&id=c250d50fe2ce627ca9805d9c8ac11cbbf922a4a6 > _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek