From mboxrd@z Thu Jan 1 00:00:00 1970 From: Viresh Kumar Subject: [PATCH 4/7] cpufreq-dt: register cooling device from ->usable() callback Date: Wed, 26 Nov 2014 11:22:59 +0530 Message-ID: <89d112f34aaecd8c90486617d57ee5d605678d56.1416980448.git.viresh.kumar@linaro.org> References: Return-path: Received: from mail-pa0-f47.google.com ([209.85.220.47]:62239 "EHLO mail-pa0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752216AbaKZFxd (ORCPT ); Wed, 26 Nov 2014 00:53:33 -0500 Received: by mail-pa0-f47.google.com with SMTP id kq14so2154564pab.34 for ; Tue, 25 Nov 2014 21:53:33 -0800 (PST) In-Reply-To: In-Reply-To: References: Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: Rafael Wysocki , edubezval@gmail.com Cc: linaro-kernel@lists.linaro.org, linux-pm@vger.kernel.org, l.majewski@samsung.com, Viresh Kumar Currently we are calling of_cpufreq_cooling_register() from ->init() callback. At this point of time cpufreq driver's policy isn't completely ready to be used as few of its fields/structure/pointers aren't yet initialized. Because of_cpufreq_cooling_register() tries to access policy with help of cpufreq_cpu_get() and then tries to get freq-table as well, these calls fail. To fix this, register the cooling device after the policy is ready to be used. And the right callback for it is the newly added ->usable() one. Signed-off-by: Viresh Kumar --- drivers/cpufreq/cpufreq-dt.c | 51 +++++++++++++++++++++++++++----------------- 1 file changed, 32 insertions(+), 19 deletions(-) diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c index 7374fc4..f7af5c8 100644 --- a/drivers/cpufreq/cpufreq-dt.c +++ b/drivers/cpufreq/cpufreq-dt.c @@ -186,7 +186,6 @@ static int cpufreq_init(struct cpufreq_policy *policy) { struct cpufreq_dt_platform_data *pd; struct cpufreq_frequency_table *freq_table; - struct thermal_cooling_device *cdev; struct device_node *np; struct private_data *priv; struct device *cpu_dev; @@ -269,20 +268,6 @@ static int cpufreq_init(struct cpufreq_policy *policy) goto out_free_priv; } - /* - * For now, just loading the cooling device; - * thermal DT code takes care of matching them. - */ - if (of_find_property(np, "#cooling-cells", NULL)) { - cdev = of_cpufreq_cooling_register(np, policy->related_cpus); - if (IS_ERR(cdev)) - dev_err(cpu_dev, - "running cpufreq without cooling device: %ld\n", - PTR_ERR(cdev)); - else - priv->cdev = cdev; - } - priv->cpu_dev = cpu_dev; priv->cpu_reg = cpu_reg; policy->driver_data = priv; @@ -292,7 +277,7 @@ static int cpufreq_init(struct cpufreq_policy *policy) if (ret) { dev_err(cpu_dev, "%s: invalid frequency table: %d\n", __func__, ret); - goto out_cooling_unregister; + goto out_free_cpufreq_table; } policy->cpuinfo.transition_latency = transition_latency; @@ -305,8 +290,7 @@ static int cpufreq_init(struct cpufreq_policy *policy) return 0; -out_cooling_unregister: - cpufreq_cooling_unregister(priv->cdev); +out_free_cpufreq_table: dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table); out_free_priv: kfree(priv); @@ -324,7 +308,8 @@ static int cpufreq_exit(struct cpufreq_policy *policy) { struct private_data *priv = policy->driver_data; - cpufreq_cooling_unregister(priv->cdev); + if (priv->cdev) + cpufreq_cooling_unregister(priv->cdev); dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table); clk_put(policy->clk); if (!IS_ERR(priv->cpu_reg)) @@ -334,6 +319,33 @@ static int cpufreq_exit(struct cpufreq_policy *policy) return 0; } +static void cpufreq_usable(struct cpufreq_policy *policy) +{ + struct private_data *priv = policy->driver_data; + struct device_node *np = of_node_get(priv->cpu_dev->of_node); + + if (WARN_ON(!np)) + return; + + /* + * For now, just loading the cooling device; + * thermal DT code takes care of matching them. + */ + if (of_find_property(np, "#cooling-cells", NULL)) { + priv->cdev = of_cpufreq_cooling_register(np, + policy->related_cpus); + if (IS_ERR(priv->cdev)) { + dev_err(priv->cpu_dev, + "running cpufreq without cooling device: %ld\n", + PTR_ERR(priv->cdev)); + + priv->cdev = NULL; + } + } + + of_node_put(np); +} + static struct cpufreq_driver dt_cpufreq_driver = { .flags = CPUFREQ_STICKY | CPUFREQ_NEED_INITIAL_FREQ_CHECK, .verify = cpufreq_generic_frequency_table_verify, @@ -341,6 +353,7 @@ static struct cpufreq_driver dt_cpufreq_driver = { .get = cpufreq_generic_get, .init = cpufreq_init, .exit = cpufreq_exit, + .usable = cpufreq_usable, .name = "cpufreq-dt", .attr = cpufreq_generic_attr, }; -- 2.0.3.693.g996b0fd