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Subject[PATCH v2] PM / devfreq: Use freq_table for available_frequencies
Date
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 it's available.

OPP find frequency APIs also skips frequencies that have been temporarily
disabled (say, due to thermal, etc). Since available_frequencies is
supposed to show the entire list of available frequencies without taking
temporary limits into consideration, preference is given to freq_table when
available.

Signed-off-by: Saravana Kannan <skannan@codeaurora.org>
---
drivers/devfreq/devfreq.c | 29 ++++++++++++++++++-----------
1 file changed, 18 insertions(+), 11 deletions(-)

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 2042ec3..527cbe2 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -912,20 +912,27 @@ 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;
ssize_t count = 0;
unsigned long freq = 0;

- rcu_read_lock();
- do {
- opp = dev_pm_opp_find_freq_ceil(dev, &freq);
- if (IS_ERR(opp))
- break;
-
- count += scnprintf(&buf[count], (PAGE_SIZE - count - 2),
- "%lu ", freq);
- freq++;
- } while (1);
- rcu_read_unlock();
+ if (df->profile->freq_table) {
+ for (i = 0; i < df->profile->max_state; i++)
+ count += scnprintf(&buf[count], (PAGE_SIZE - count - 2),
+ "%u ", df->profile->freq_table[i]);
+ } else {
+ rcu_read_lock();
+ do {
+ opp = dev_pm_opp_find_freq_ceil(dev, &freq);
+ if (IS_ERR(opp))
+ break;
+
+ count += scnprintf(&buf[count], (PAGE_SIZE - count - 2),
+ "%lu ", freq);
+ freq++;
+ } while (1);
+ rcu_read_unlock();
+ }

/* Truncate the trailing space */
if (count)
--
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