linux-kernel - Re: [PATCH 3/4] cpufreq: mediatek: clean up cpufreq driver

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Message-ID: <0fa44005-158b-74ee-f4ff-f2694ffce38a@canonical.com>
Date:   Mon, 7 Mar 2022 20:02:39 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Tim Chang <jia-wei.chang@...iatek.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, fan.chen@...iatek.com,
        louis.yu@...iatek.com, roger.lu@...iatek.com,
        Allen-yy.Lin@...iatek.com,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        hsinyi@...gle.com,
        Jia-Wei Chang <jia-wei.chang@...iatek.corp-partner.google.com>
Subject: Re: [PATCH 3/4] cpufreq: mediatek: clean up cpufreq driver

On 07/03/2022 13:21, Tim Chang wrote:
> cleanup of naming, print log and comments.
> 
> Signed-off-by: Jia-Wei Chang <jia-wei.chang@...iatek.corp-partner.google.com>
> ---
>  drivers/cpufreq/mediatek-cpufreq.c | 487 ++++++++++++++---------------
>  1 file changed, 233 insertions(+), 254 deletions(-)
> 
> diff --git a/drivers/cpufreq/mediatek-cpufreq.c b/drivers/cpufreq/mediatek-cpufreq.c
> index 8e9d706d8081..3f00c7eb01f1 100644
> --- a/drivers/cpufreq/mediatek-cpufreq.c
> +++ b/drivers/cpufreq/mediatek-cpufreq.c
> @@ -1,7 +1,6 @@
>  // SPDX-License-Identifier: GPL-2.0-only
>  /*
> - * Copyright (c) 2015 Linaro Ltd.
> - * Author: Pi-Cheng Chen <pi-cheng.chen@...aro.org>
> + * Copyright (C) 2022 MediaTek Inc.

Removal of authorship and existing copyrights does not fit into "clean
up". Please explain this thoroughly.

>   */
>  
>  #include <linux/clk.h>
> @@ -22,7 +21,7 @@
>  #define VOLT_TOL		(10000)
>  
>  /*
> - * The struct mtk_cpu_dvfs_info holds necessary information for doing CPU DVFS
> + * The struct mtk_cpufreq_drv holds necessary information for doing CPU DVFS
>   * on each CPU power/clock domain of Mediatek SoCs. Each CPU cluster in
>   * Mediatek SoCs has two voltage inputs, Vproc and Vsram. In some cases the two
>   * voltage inputs need to be controlled under a hardware limitation:
> @@ -32,7 +31,7 @@
>   * needs to be switched to another stable PLL clock temporarily until
>   * the original PLL becomes stable at target frequency.
>   */
> -struct mtk_cpu_dvfs_info {
> +struct mtk_cpufreq_drv {
>  	struct cpumask cpus;
>  	struct device *cpu_dev;
>  	struct regulator *proc_reg;
> @@ -40,45 +39,45 @@ struct mtk_cpu_dvfs_info {
>  	struct clk *cpu_clk;
>  	struct clk *inter_clk;
>  	struct list_head list_head;
> -	int intermediate_voltage;
> +	int inter_voltage;
>  	bool need_voltage_tracking;
> -	int old_vproc;
> -	struct mutex lock; /* avoid notify and policy race condition */
> +	int old_voltage;
> +	struct mutex lock;  /* avoid notify and policy race condition */
>  	struct notifier_block opp_nb;
>  	int opp_cpu;
>  	unsigned long opp_freq;
>  };
>  
> -static LIST_HEAD(dvfs_info_list);
> +static LIST_HEAD(drv_list);
>  
> -static struct mtk_cpu_dvfs_info *mtk_cpu_dvfs_info_lookup(int cpu)
> +static struct mtk_cpufreq_drv *mtk_cpufreq_drv_lookup(int cpu)
>  {
> -	struct mtk_cpu_dvfs_info *info;
> +	struct mtk_cpufreq_drv *drv;
>  
> -	list_for_each_entry(info, &dvfs_info_list, list_head) {
> -		if (cpumask_test_cpu(cpu, &info->cpus))
> -			return info;
> +	list_for_each_entry(drv, &drv_list, list_head) {
> +		if (cpumask_test_cpu(cpu, &drv->cpus))
> +			return drv;>  	}
>  
>  	return NULL;
>  }
>  
> -static int mtk_cpufreq_voltage_tracking(struct mtk_cpu_dvfs_info *info,
> -					int new_vproc)
> +static int mtk_cpufreq_voltage_tracking(struct mtk_cpufreq_drv *drv,
> +					int new_voltage)
>  {
> -	struct regulator *proc_reg = info->proc_reg;
> -	struct regulator *sram_reg = info->sram_reg;
> -	int old_vproc, old_vsram, new_vsram, vsram, vproc, ret;
> -
> -	old_vproc = regulator_get_voltage(proc_reg);
> -	if (old_vproc < 0) {
> -		pr_err("%s: invalid Vproc value: %d\n", __func__, old_vproc);
> -		return old_vproc;
> +	struct regulator *proc_reg = drv->proc_reg;
> +	struct regulator *sram_reg = drv->sram_reg;
> +	int old_voltage, old_vsram, new_vsram, vsram, voltage, ret;
> +
> +	old_voltage = regulator_get_voltage(proc_reg);
> +	if (old_voltage < 0) {
> +		pr_err("%s: invalid vproc value: %d\n", __func__, old_voltage);
> +		return old_voltage;


Several different changes in one commit. Please read the document
"Submitting patches".

(...)

> -MODULE_AUTHOR("Pi-Cheng Chen <pi-cheng.chen@...aro.org>");
> +MODULE_AUTHOR("Jia-Wei Chang <jia-wei.chang@...iatek.com>");

Ekhm, why? He was not the author?

Best regards,
Krzysztof