Re: [PATCH v2 1/2] PM / OPP: Allow boost frequency to be looked up from device tree

Sudeep Holla
2014-02-10T10:40:23Z

On 08/02/14 05:10, Thomas Abraham wrote:
> On Fri, Feb 7, 2014 at 9:31 PM, Sudeep Holla <Sudeep.Holla@arm.com> wrote:
>> On 07/02/14 15:19, Thomas Abraham wrote:
>>> From: Thomas Abraham <thomas.ab@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@ti.com>
>>> Cc: Lukasz Majewski <l.majewski@samsung.com>
>>> Signed-off-by: Thomas Abraham <thomas.ab@samsung.com>
>>> ---
>>> drivers/base/power/opp.c | 34 +++++++++++++++++++++++++++++++++-
>>> 1 file changed, 33 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c
>>> index fa41874..b636826 100644
>>> --- a/drivers/base/power/opp.c
>>> +++ b/drivers/base/power/opp.c
>>> @@ -628,7 +628,8 @@ int dev_pm_opp_init_cpufreq_table(struct device *dev,
>>> struct device_opp *dev_opp;
>>> struct dev_pm_opp *opp;
>>> struct cpufreq_frequency_table *freq_table;
>>> - int i = 0;
>>> + int i = 0, j, len, ret;
>>> + u32 *boost_freqs = NULL;
>>>
>>> /* Pretend as if I am an updater */
>>> mutex_lock(&dev_opp_list_lock);
>>> @@ -650,10 +651,35 @@ int dev_pm_opp_init_cpufreq_table(struct device *dev,
>>> return -ENOMEM;
>>> }
>>>
>>> + if (of_find_property(dev->of_node, "boost-frequency", &len)) {
>>> + if (len == 0 || (len & (sizeof(u32) - 1)) != 0) {
>>> + dev_err(dev, "%s: invalid boost frequency\n", __func__);
>>> + ret = -EINVAL;
>>> + goto err_boost;
>>> + }
>>> +
>>> + boost_freqs = kzalloc(len, GFP_KERNEL);
>>> + if (!boost_freqs) {
>>> + dev_warn(dev, "%s: no memory for boost freq table\n",
>>> + __func__);
>>> + ret = -ENOMEM;
>>> + goto err_boost;
>>> + }
>>> + of_property_read_u32_array(dev->of_node, "boost-frequency",
>>> + boost_freqs, len / sizeof(u32));
>>> + }
>>> +
>>> list_for_each_entry(opp, &dev_opp->opp_list, node) {
>>> if (opp->available) {
>>> freq_table[i].driver_data = i;
>>> freq_table[i].frequency = opp->rate / 1000;
>>> + for (j = 0; j < len / sizeof(u32) && boost_freqs; j++) {
>>> + if (boost_freqs[j] == freq_table[i].frequency) {
>>> + freq_table[i].driver_data =
>>> + CPUFREQ_BOOST_FREQ;
>>> + break;
>>> + }
>>> + }
>>> i++;
>>> }
>>> }
>> IIRC you had mentioned that the boost-opp was not limited to be a cpufreq, but
>> this change seems to be cpufreq only.
>
> Yes, but as you have initiated the discussion on extending the OPP
> binding, this has been limited to cpufreq only. If the new OPP library
> has support for listing boost frequency, this can be migrated to the
> new OPP libaray.
>

Fair enough, just wanted to check as I couldn't get the info following the
thread. I might have missed it.

Regards,
Sudeep