linux-kernel - Re: [PATCH v15 3/3] cpufreq: mediatek-hw: Add support for CPUFREQ HW

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Date:   Mon, 6 Sep 2021 15:14:11 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Hector Yuan <hector.yuan@...iatek.com>
Cc:     linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, wsd_upstream@...iatek.com
Subject: Re: [PATCH v15 3/3] cpufreq: mediatek-hw: Add support for CPUFREQ HW

On 03-09-21, 16:39, Hector Yuan wrote:
> From: "Hector.Yuan" <hector.yuan@...iatek.com>
> 
> Introduce cpufreq HW driver which can support
> CPU frequency adjust in MT6779 platform.
> 
> Signed-off-by: Hector.Yuan <hector.yuan@...iatek.com>
> ---
>  drivers/cpufreq/Kconfig.arm           |   12 ++
>  drivers/cpufreq/Makefile              |    1 +
>  drivers/cpufreq/mediatek-cpufreq-hw.c |  340 +++++++++++++++++++++++++++++++++
>  3 files changed, 353 insertions(+)
>  create mode 100644 drivers/cpufreq/mediatek-cpufreq-hw.c

Here as well, I have added below diff to the original patch. Lemme
know if you don't like something.

diff --git a/drivers/cpufreq/mediatek-cpufreq-hw.c b/drivers/cpufreq/mediatek-cpufreq-hw.c
index 9c6df1b00f3e..0cf18dd46b92 100644
--- a/drivers/cpufreq/mediatek-cpufreq-hw.c
+++ b/drivers/cpufreq/mediatek-cpufreq-hw.c
@@ -33,12 +33,6 @@ enum {
        REG_ARRAY_SIZE,
 };

-struct mtk_cpufreq_drv;
-
-struct mtk_cpufreq_drv {
-       const u16 *offsets;
-};
-
 struct mtk_cpufreq_data {
        struct cpufreq_frequency_table *table;
        void __iomem *reg_bases[REG_ARRAY_SIZE];
@@ -126,8 +120,8 @@ static int mtk_cpu_create_freq_table(struct platform_device *pdev,
                                     struct mtk_cpufreq_data *data)
 {
        struct device *dev = &pdev->dev;
-       void __iomem *base_table;
        u32 temp, i, freq, prev_freq = 0;
+       void __iomem *base_table;

        data->table = devm_kcalloc(dev, LUT_MAX_ENTRIES + 1,
                                   sizeof(*data->table), GFP_KERNEL);
@@ -198,15 +192,13 @@ static int mtk_cpu_resources_init(struct platform_device *pdev,
 static int mtk_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
 {
        struct platform_device *pdev = cpufreq_get_driver_data();
-       struct mtk_cpufreq_drv *drv = platform_get_drvdata(pdev);
        int sig, pwr_hw = CPUFREQ_HW_STATUS | SVS_HW_STATUS;
        struct mtk_cpufreq_data *data;
-       struct device *cpu_dev;
        unsigned int latency;
        int ret;

        /* Get the bases of cpufreq for domains */
-       ret = mtk_cpu_resources_init(pdev, policy, drv->offsets);
+       ret = mtk_cpu_resources_init(pdev, policy, platform_get_drvdata(pdev));
        if (ret) {
                dev_info(&pdev->dev, "CPUFreq resource init failed\n");
                return ret;
@@ -218,9 +210,7 @@ static int mtk_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
        if (!latency)
                latency = CPUFREQ_ETERNAL;

-       /* us convert to ns */
        policy->cpuinfo.transition_latency = latency;
-
        policy->fast_switch_possible = true;

        /* HW should be in enabled state to proceed now */
@@ -237,12 +227,6 @@ static int mtk_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
                pr_info("SVS of CPU%d is not enabled\n", policy->cpu);
        }

-       cpu_dev = get_cpu_device(policy->cpu);
-       if (!cpu_dev) {
-               pr_info("failed to get cpu%d device\n", policy->cpu);
-               return -ENODEV;
-       }
-
        return 0;
 }

@@ -261,9 +245,6 @@ static void mtk_cpufreq_register_em(struct cpufreq_policy *policy)
        struct em_data_callback em_cb = EM_DATA_CB(mtk_cpufreq_get_cpu_power);
        struct mtk_cpufreq_data *data = policy->driver_data;

-       if (!data->nr_opp)
-               return;
-
        em_dev_register_perf_domain(get_cpu_device(policy->cpu), data->nr_opp,
                                    &em_cb, policy->cpus, true);
 }
@@ -285,22 +266,14 @@ static struct cpufreq_driver cpufreq_mtk_hw_driver = {

 static int mtk_cpufreq_hw_driver_probe(struct platform_device *pdev)
 {
-       struct mtk_cpufreq_drv *drv;
-       const u16 *offsets;
+       const void *data;
        int ret;

-       offsets = of_device_get_match_data(&pdev->dev);
-       if (!offsets)
+       data = of_device_get_match_data(&pdev->dev);
+       if (!data)
                return -EINVAL;

-       drv = kzalloc(sizeof(*drv), GFP_KERNEL);
-       if (!drv)
-               return -ENOMEM;
-
-       drv->offsets = offsets;
-
-       platform_set_drvdata(pdev, drv);
-
+       platform_set_drvdata(pdev, (void *) data);
        cpufreq_mtk_hw_driver.driver_data = pdev;

        ret = cpufreq_register_driver(&cpufreq_mtk_hw_driver);
@@ -312,11 +285,6 @@ static int mtk_cpufreq_hw_driver_probe(struct platform_device *pdev)

 static int mtk_cpufreq_hw_driver_remove(struct platform_device *pdev)
 {
-       struct mtk_cpufreq_drv *drv = platform_get_drvdata(pdev);
-
-       kfree(drv->offsets);
-       kfree(drv);
-
        return cpufreq_unregister_driver(&cpufreq_mtk_hw_driver);
 }