linux-kernel - Re: [Patch v2] cpufreq: tegra194: Add support for Tegra239

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Date:   Tue, 4 Oct 2022 10:27:14 -0500
From:   Rob Herring <robh@...nel.org>
To:     Sumit Gupta <sumitg@...dia.com>
Cc:     viresh.kumar@...aro.org, rafael@...nel.org, treding@...dia.com,
        jonathanh@...dia.com, linux-pm@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        bbasu@...dia.com, sanjayc@...dia.com, ksitaraman@...dia.com
Subject: Re: [Patch v2] cpufreq: tegra194: Add support for Tegra239

On Tue, Sep 20, 2022 at 04:36:46PM +0530, Sumit Gupta wrote:
> Adding support for Tegra239 SoC which has eight cores in
> a single cluster. Also, moving num_clusters to SoC data
> to avoid over allocating memory for four clusters always.
> 
> Signed-off-by: Sumit Gupta <sumitg@...dia.com>
> Acked-by: Thierry Reding <treding@...dia.com>
> ---
> v1 -> v2:
> - updated subject line and commit message.
> - changed type for 'num_clusters' from 'size_t' to 'unsigned int'.
> 
>  drivers/cpufreq/tegra194-cpufreq.c | 29 +++++++++++++++--------------
>  1 file changed, 15 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/cpufreq/tegra194-cpufreq.c b/drivers/cpufreq/tegra194-cpufreq.c
> index 7e143c06972e..cfc1b225f811 100644
> --- a/drivers/cpufreq/tegra194-cpufreq.c
> +++ b/drivers/cpufreq/tegra194-cpufreq.c
> @@ -38,14 +38,6 @@
>  /* cpufreq transisition latency */
>  #define TEGRA_CPUFREQ_TRANSITION_LATENCY (300 * 1000) /* unit in nanoseconds */
>  
> -enum cluster {
> -	CLUSTER0,
> -	CLUSTER1,
> -	CLUSTER2,
> -	CLUSTER3,
> -	MAX_CLUSTERS,
> -};
> -
>  struct tegra_cpu_ctr {
>  	u32 cpu;
>  	u32 coreclk_cnt, last_coreclk_cnt;
> @@ -67,12 +59,12 @@ struct tegra_cpufreq_ops {
>  struct tegra_cpufreq_soc {
>  	struct tegra_cpufreq_ops *ops;
>  	int maxcpus_per_cluster;
> +	unsigned int num_clusters;
>  	phys_addr_t actmon_cntr_base;
>  };
>  
>  struct tegra194_cpufreq_data {
>  	void __iomem *regs;
> -	size_t num_clusters;
>  	struct cpufreq_frequency_table **tables;
>  	const struct tegra_cpufreq_soc *soc;
>  };
> @@ -166,6 +158,14 @@ static const struct tegra_cpufreq_soc tegra234_cpufreq_soc = {
>  	.ops = &tegra234_cpufreq_ops,
>  	.actmon_cntr_base = 0x9000,
>  	.maxcpus_per_cluster = 4,
> +	.num_clusters = 3,
> +};
> +
> +const struct tegra_cpufreq_soc tegra239_cpufreq_soc = {
> +	.ops = &tegra234_cpufreq_ops,
> +	.actmon_cntr_base = 0x4000,
> +	.maxcpus_per_cluster = 8,
> +	.num_clusters = 1,
>  };
>  
>  static void tegra194_get_cpu_cluster_id(u32 cpu, u32 *cpuid, u32 *clusterid)
> @@ -378,7 +378,7 @@ static int tegra194_cpufreq_init(struct cpufreq_policy *policy)
>  
>  	data->soc->ops->get_cpu_cluster_id(policy->cpu, NULL, &clusterid);
>  
> -	if (clusterid >= data->num_clusters || !data->tables[clusterid])
> +	if (clusterid >= data->soc->num_clusters || !data->tables[clusterid])
>  		return -EINVAL;
>  
>  	start_cpu = rounddown(policy->cpu, maxcpus_per_cluster);
> @@ -429,6 +429,7 @@ static struct tegra_cpufreq_ops tegra194_cpufreq_ops = {
>  static const struct tegra_cpufreq_soc tegra194_cpufreq_soc = {
>  	.ops = &tegra194_cpufreq_ops,
>  	.maxcpus_per_cluster = 2,
> +	.num_clusters = 4,
>  };
>  
>  static void tegra194_cpufreq_free_resources(void)
> @@ -521,15 +522,14 @@ static int tegra194_cpufreq_probe(struct platform_device *pdev)
>  
>  	soc = of_device_get_match_data(&pdev->dev);
>  
> -	if (soc->ops && soc->maxcpus_per_cluster) {
> +	if (soc->ops && soc->maxcpus_per_cluster && soc->num_clusters) {
>  		data->soc = soc;
>  	} else {
>  		dev_err(&pdev->dev, "soc data missing\n");
>  		return -EINVAL;
>  	}
>  
> -	data->num_clusters = MAX_CLUSTERS;
> -	data->tables = devm_kcalloc(&pdev->dev, data->num_clusters,
> +	data->tables = devm_kcalloc(&pdev->dev, data->soc->num_clusters,
>  				    sizeof(*data->tables), GFP_KERNEL);
>  	if (!data->tables)
>  		return -ENOMEM;
> @@ -554,7 +554,7 @@ static int tegra194_cpufreq_probe(struct platform_device *pdev)
>  		goto put_bpmp;
>  	}
>  
> -	for (i = 0; i < data->num_clusters; i++) {
> +	for (i = 0; i < data->soc->num_clusters; i++) {
>  		data->tables[i] = init_freq_table(pdev, bpmp, i);
>  		if (IS_ERR(data->tables[i])) {
>  			err = PTR_ERR(data->tables[i]);
> @@ -586,6 +586,7 @@ static int tegra194_cpufreq_remove(struct platform_device *pdev)
>  static const struct of_device_id tegra194_cpufreq_of_match[] = {
>  	{ .compatible = "nvidia,tegra194-ccplex", .data = &tegra194_cpufreq_soc },
>  	{ .compatible = "nvidia,tegra234-ccplex-cluster", .data = &tegra234_cpufreq_soc },
> +	{ .compatible = "nvidia,tegra239-ccplex-cluster", .data = &tegra239_cpufreq_soc },

Not documented.

Rob