linux-kernel - Re: [PATCH] PM / devfreq: Use freq_table for available

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Date:	Mon, 14 Apr 2014 13:51:37 -0700
From:	Saravana Kannan <skannan@...eaurora.org>
To:	Saravana Kannan <skannan@...eaurora.org>
CC:	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] PM / devfreq: Use freq_table for available_frequencies

MyungJoo/Kyungmin,

Bump. Can we accept this patch please?

-Saravana


On 04/10/2014 07:54 PM, Saravana Kannan wrote:
> Some devices use freq_table instead of OPP. For those devices, the
> available_frequencies file shows up empty. Fix that by using freq_table to
> generate the available_frequencies data when OPP is not present.
>
> Signed-off-by: Saravana Kannan <skannan@...eaurora.org>
> ---
>   drivers/devfreq/devfreq.c | 15 +++++++++++----
>   1 file changed, 11 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
> index 2042ec3..a715d15 100644
> --- a/drivers/devfreq/devfreq.c
> +++ b/drivers/devfreq/devfreq.c
> @@ -912,19 +912,26 @@ static ssize_t available_frequencies_show(struct device *d,
>   	struct devfreq *df = to_devfreq(d);
>   	struct device *dev = df->dev.parent;
>   	struct dev_pm_opp *opp;
> +	unsigned int i = 0, max_state = df->profile->max_state;
> +	bool use_opp;
>   	ssize_t count = 0;
>   	unsigned long freq = 0;
>
>   	rcu_read_lock();
> +	use_opp = dev_pm_opp_get_opp_count(dev) > 0;
>   	do {
> -		opp = dev_pm_opp_find_freq_ceil(dev, &freq);
> -		if (IS_ERR(opp))
> -			break;
> +		if (use_opp) {
> +			opp = dev_pm_opp_find_freq_ceil(dev, &freq);
> +			if (IS_ERR(opp))
> +				break;
> +		} else {
> +			freq = df->profile->freq_table[i++];
> +		}
>
>   		count += scnprintf(&buf[count], (PAGE_SIZE - count - 2),
>   				   "%lu ", freq);
>   		freq++;
> -	} while (1);
> +	} while (use_opp || (!use_opp && i < max_state));
>   	rcu_read_unlock();
>
>   	/* Truncate the trailing space */
>


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