[PATCH v5 1/2] cpufreq / OPP: Allow boost frequency to be looked up from device tree

[Lukasz Majewski]

Hi Thomas,

> From: Thomas Abraham <thomas.ab at samsung.com>
> 
> Commit 6f19efc0 ("cpufreq: Add boost frequency support in core") adds
> support for CPU boost mode. This patch adds support for finding
> available boost frequencies from device tree and marking them as
> usable in boost mode.
> 
> Cc: Nishanth Menon <nm at ti.com>
> Cc: Lukasz Majewski <l.majewski at samsung.com>
> Signed-off-by: Thomas Abraham <thomas.ab at samsung.com>
> ---
>  drivers/cpufreq/cpufreq_opp.c |   45
> +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45
> insertions(+)
> 
> diff --git a/drivers/cpufreq/cpufreq_opp.c
> b/drivers/cpufreq/cpufreq_opp.c index c0c6f4a..05fb115 100644
> --- a/drivers/cpufreq/cpufreq_opp.c
> +++ b/drivers/cpufreq/cpufreq_opp.c
> @@ -19,6 +19,7 @@
>  #include <linux/pm_opp.h>
>  #include <linux/rcupdate.h>
>  #include <linux/slab.h>
> +#include <linux/of.h>
>  
>  /**
>   * dev_pm_opp_init_cpufreq_table() - create a cpufreq table for a
> device @@ -51,6 +52,11 @@ int dev_pm_opp_init_cpufreq_table(struct
> device *dev, struct cpufreq_frequency_table *freq_table = NULL;
>  	int i, max_opps, ret = 0;
>  	unsigned long rate;
> +#ifdef CONFIG_CPU_FREQ_BOOST_SW
> +	struct cpufreq_frequency_table *ft;
> +	int len, count;
> +	u32 *boost_freqs = NULL;
> +#endif
>  
>  	rcu_read_lock();
>  
> @@ -82,6 +88,45 @@ int dev_pm_opp_init_cpufreq_table(struct device
> *dev, 
>  	*table = &freq_table[0];
>  
> +#ifdef CONFIG_CPU_FREQ_BOOST_SW
> +	if (!of_find_property(dev->of_node, "boost-frequencies",
> &len))
> +		goto out;
> +
> +	if (!len || !IS_ALIGNED(len, sizeof(u32))) {
> +		dev_err(dev, "%s: invalid boost frequency\n",
> __func__);
> +		ret = -EINVAL;
> +		goto out;
> +	}
> +
> +	boost_freqs = kmalloc(len, GFP_KERNEL);
> +	if (!boost_freqs) {
> +		dev_err(dev, "%s: no memory for boost freq table\n",
> __func__);
> +		ret = -ENOMEM;
> +		goto out;
> +	}
> +
> +	count = len / sizeof(u32);
> +	of_property_read_u32_array(dev->of_node, "boost-frequencies",
> +			boost_freqs, count);
> +
> +	for (i = 0; i < count; i++) {
> +		cpufreq_for_each_valid_entry(ft, *table) {
> +			if (boost_freqs[i] == ft->frequency) {
> +				ft->flags |= CPUFREQ_BOOST_FREQ;
> +				pr_debug("%s: marked %d as boost
> frequency\n",
> +					__func__, boost_freqs[i]);
> +				break;
> +			}
> +		}
> +
> +		if (ft->frequency == CPUFREQ_TABLE_END)
> +			dev_err(dev, "%s: invalid boost frequency
> %d\n",
> +				__func__, boost_freqs[i]);
> +	}
> +
> +	kfree(boost_freqs);
> +#endif
> +
>  out:
>  	rcu_read_unlock();
>  	if (ret)

Acked-by: Lukasz Majewski <l.majewski at samsung.com>

Thomas, thanks for this patch.

-- 
Best regards,

Lukasz Majewski

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