Since the return value of ->init() of cpufreq driver is not propagated to the device driver model now, move resources allocation into ->probe() to handle -EPROBE_DEFER properly.
Signed-off-by: Pi-Cheng Chen pi-cheng.chen@linaro.org Acked-by: Viresh Kumar viresh.kumar@linaro.org --- v2->v3: - rename get_dvfs_info() as mtk_cpu_dvfs_info_lookup() - fix some minor issues of v2 v1->v2: - fix error handling path in ->probe() --- drivers/cpufreq/mt8173-cpufreq.c | 92 +++++++++++++++++++++++++++++----------- 1 file changed, 68 insertions(+), 24 deletions(-)
diff --git a/drivers/cpufreq/mt8173-cpufreq.c b/drivers/cpufreq/mt8173-cpufreq.c index 9d0fe37..fd601b9 100644 --- a/drivers/cpufreq/mt8173-cpufreq.c +++ b/drivers/cpufreq/mt8173-cpufreq.c @@ -41,16 +41,35 @@ * the original PLL becomes stable at target frequency. */ struct mtk_cpu_dvfs_info { + struct cpumask cpus; struct device *cpu_dev; struct regulator *proc_reg; struct regulator *sram_reg; struct clk *cpu_clk; struct clk *inter_clk; struct thermal_cooling_device *cdev; + struct list_head list_head; int intermediate_voltage; bool need_voltage_tracking; };
+static LIST_HEAD(dvfs_info_list); + +static struct mtk_cpu_dvfs_info *mtk_cpu_dvfs_info_lookup(int cpu) +{ + struct mtk_cpu_dvfs_info *info; + struct list_head *list; + + list_for_each(list, &dvfs_info_list) { + info = list_entry(list, struct mtk_cpu_dvfs_info, list_head); + + if (cpumask_test_cpu(cpu, &info->cpus)) + return info; + } + + return NULL; +} + static int mtk_cpufreq_voltage_tracking(struct mtk_cpu_dvfs_info *info, int new_vproc) { @@ -402,6 +421,9 @@ static int mtk_cpu_dvfs_info_init(struct mtk_cpu_dvfs_info *info, int cpu) */ info->need_voltage_tracking = !IS_ERR(sram_reg);
+ /* CPUs in the same cluster share a clock and power domain. */ + cpumask_copy(&info->cpus, &cpu_topology[cpu].core_sibling); + return 0;
out_free_opp_table: @@ -440,22 +462,18 @@ static int mtk_cpufreq_init(struct cpufreq_policy *policy) struct cpufreq_frequency_table *freq_table; int ret;
- info = kzalloc(sizeof(*info), GFP_KERNEL); - if (!info) - return -ENOMEM; - - ret = mtk_cpu_dvfs_info_init(info, policy->cpu); - if (ret) { - pr_err("%s failed to initialize dvfs info for cpu%d\n", - __func__, policy->cpu); - goto out_free_dvfs_info; + info = mtk_cpu_dvfs_info_lookup(policy->cpu); + if (!info) { + pr_err("dvfs info for cpu%d is not initialized.\n", + policy->cpu); + return -EINVAL; }
ret = dev_pm_opp_init_cpufreq_table(info->cpu_dev, &freq_table); if (ret) { pr_err("failed to init cpufreq table for cpu%d: %d\n", policy->cpu, ret); - goto out_release_dvfs_info; + return ret; }
ret = cpufreq_table_validate_and_show(policy, freq_table); @@ -464,8 +482,7 @@ static int mtk_cpufreq_init(struct cpufreq_policy *policy) goto out_free_cpufreq_table; }
- /* CPUs in the same cluster share a clock and power domain. */ - cpumask_copy(policy->cpus, &cpu_topology[policy->cpu].core_sibling); + cpumask_copy(policy->cpus, &info->cpus); policy->driver_data = info; policy->clk = info->cpu_clk;
@@ -473,13 +490,6 @@ static int mtk_cpufreq_init(struct cpufreq_policy *policy)
out_free_cpufreq_table: dev_pm_opp_free_cpufreq_table(info->cpu_dev, &freq_table); - -out_release_dvfs_info: - mtk_cpu_dvfs_info_release(info); - -out_free_dvfs_info: - kfree(info); - return ret; }
@@ -489,8 +499,6 @@ static int mtk_cpufreq_exit(struct cpufreq_policy *policy)
cpufreq_cooling_unregister(info->cdev); dev_pm_opp_free_cpufreq_table(info->cpu_dev, &policy->freq_table); - mtk_cpu_dvfs_info_release(info); - kfree(info);
return 0; } @@ -510,11 +518,47 @@ static struct cpufreq_driver mt8173_cpufreq_driver = {
static int mt8173_cpufreq_probe(struct platform_device *pdev) { - int ret; + struct mtk_cpu_dvfs_info *info; + struct list_head *list, *tmp; + int cpu, ret; + + for_each_possible_cpu(cpu) { + info = mtk_cpu_dvfs_info_lookup(cpu); + if (info) + continue; + + info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); + if (!info) { + ret = -ENOMEM; + goto release_dvfs_info_list; + } + + ret = mtk_cpu_dvfs_info_init(info, cpu); + if (ret) { + dev_err(&pdev->dev, + "failed to initialize dvfs info for cpu%d\n", + cpu); + goto release_dvfs_info_list; + } + + list_add(&info->list_head, &dvfs_info_list); + }
ret = cpufreq_register_driver(&mt8173_cpufreq_driver); - if (ret) - pr_err("failed to register mtk cpufreq driver\n"); + if (ret) { + dev_err(&pdev->dev, "failed to register mtk cpufreq driver\n"); + goto release_dvfs_info_list; + } + + return 0; + +release_dvfs_info_list: + list_for_each_safe(list, tmp, &dvfs_info_list) { + info = list_entry(list, struct mtk_cpu_dvfs_info, list_head); + + mtk_cpu_dvfs_info_release(info); + list_del(list); + }
return ret; }