On 02/04/2014 03:41 AM, Thomas Abraham wrote:
> From: Thomas Abraham <thomas.ab@xxxxxxxxxxx>
>
> Commit 6f19efc0 ("cpufreq: Add boost frequency support in core") adds
> support for CPU boost mode. This patch adds support for finding available
> boost OPPs from device tree and marking them as usable in boost mode.
>
> Cc: Nishanth Menon <nm@xxxxxx>
> Cc: Lukasz Majewski <l.majewski@xxxxxxxxxxx>
> Signed-off-by: Thomas Abraham <thomas.ab@xxxxxxxxxxx>
> ---
Why is a cpufreq feature being pushed on to OPP library? you can very
well have a property boot-frequencies = < a b c > and be done with the
job.
I agree with Rob's comment that this is something we have to discuss
in wider "add features to an OPP" discussion[1].
[1] http://marc.info/?t=139108946400001&r=1&w=2
> drivers/base/power/opp.c | 69 +++++++++++++++++++++++++++++++++++++---------
> 1 file changed, 56 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c
> index 2553867..de4d52d 100644
> --- a/drivers/base/power/opp.c
> +++ b/drivers/base/power/opp.c
> @@ -62,6 +62,7 @@ struct dev_pm_opp {
> struct list_head node;
>
> bool available;
> + bool boost;
> unsigned long rate;
> unsigned long u_volt;
>
> @@ -380,10 +381,12 @@ struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
> EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor);
>
> /**
> - * dev_pm_opp_add() - Add an OPP table from a table definitions
> + * dev_pm_opp_add_flags() - Add an OPP to device OPP list with flags
> * @dev: device for which we do this operation
> * @freq: Frequency in Hz for this OPP
> * @u_volt: Voltage in uVolts for this OPP
> + * @available: initial availability of the OPP with adding it to the list.
> + * @boost: availability of this opp in controller's boost operating mode.
> *
> * This function adds an opp definition to the opp list and returns status.
> * The opp is made available by default and it can be controlled using
> @@ -395,7 +398,8 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor);
> * that this function is *NOT* called under RCU protection or in contexts where
> * mutex cannot be locked.
> */
> -int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt)
> +static int dev_pm_opp_add_flags(struct device *dev, unsigned long freq,
> + unsigned long u_volt, bool available, bool boost)
> {
> struct device_opp *dev_opp = NULL;
> struct dev_pm_opp *opp, *new_opp;
> @@ -441,7 +445,8 @@ int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt)
> new_opp->dev_opp = dev_opp;
> new_opp->rate = freq;
> new_opp->u_volt = u_volt;
> - new_opp->available = true;
> + new_opp->available = available;
> + new_opp->boost = boost;
>
> /* Insert new OPP in order of increasing frequency */
> head = &dev_opp->opp_list;
> @@ -462,6 +467,27 @@ int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt)
> srcu_notifier_call_chain(&dev_opp->head, OPP_EVENT_ADD, new_opp);
> return 0;
> }
> +
> +/**
> + * dev_pm_opp_add() - Add an OPP table from a table definitions
> + * @dev: device for which we do this operation
> + * @freq: Frequency in Hz for this OPP
> + * @u_volt: Voltage in uVolts for this OPP
> + *
> + * This function adds an opp definition to the opp list and returns status.
> + * The opp is made available by default and it can be controlled using
> + * dev_pm_opp_enable/disable functions.
> + *
> + * Locking: The internal device_opp and opp structures are RCU protected.
> + * Hence this function internally uses RCU updater strategy with mutex locks
> + * to keep the integrity of the internal data structures. Callers should ensure
> + * that this function is *NOT* called under RCU protection or in contexts where
> + * mutex cannot be locked.
> + */
> +int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt)
> +{
> + return dev_pm_opp_add_flags(dev, freq, u_volt, true, false);
> +}
> EXPORT_SYMBOL_GPL(dev_pm_opp_add);
>
> /**
> @@ -651,7 +677,8 @@ int dev_pm_opp_init_cpufreq_table(struct device *dev,
>
> list_for_each_entry(opp, &dev_opp->opp_list, node) {
> if (opp->available) {
> - freq_table[i].driver_data = i;
> + freq_table[i].driver_data =
> + opp->boost ? CPUFREQ_BOOST_FREQ : i;
> freq_table[i].frequency = opp->rate / 1000;
> i++;
> }
> @@ -701,19 +728,14 @@ struct srcu_notifier_head *dev_pm_opp_get_notifier(struct device *dev)
> }
>
> #ifdef CONFIG_OF
> -/**
> - * of_init_opp_table() - Initialize opp table from device tree
> - * @dev: device pointer used to lookup device OPPs.
> - *
> - * Register the initial OPP table with the OPP library for given device.
> - */
> -int of_init_opp_table(struct device *dev)
> +static int of_parse_opp_table(struct device *dev, const char *prop_name,
> + bool boost)
> {
> const struct property *prop;
> const __be32 *val;
> int nr;
>
> - prop = of_find_property(dev->of_node, "operating-points", NULL);
> + prop = of_find_property(dev->of_node, prop_name, NULL);
> if (!prop)
> return -ENODEV;
> if (!prop->value)
> @@ -734,7 +756,7 @@ int of_init_opp_table(struct device *dev)
> unsigned long freq = be32_to_cpup(val++) * 1000;
> unsigned long volt = be32_to_cpup(val++);
>
> - if (dev_pm_opp_add(dev, freq, volt)) {
> + if (dev_pm_opp_add_flags(dev, freq, volt, true, boost)) {
> dev_warn(dev, "%s: Failed to add OPP %ld\n",
> __func__, freq);
> continue;
> @@ -744,5 +766,26 @@ int of_init_opp_table(struct device *dev)
>
> return 0;
> }
> +
> +/**
> + * of_init_opp_table() - Initialize opp table from device tree
> + * @dev: device pointer used to lookup device OPPs.
> + *
> + * Register the initial OPP table with the OPP library for given device.
> + * Additional "boost" operating points of the controller, if any, are
> + * specified with "boost-opp" property.
> + */
> +int of_init_opp_table(struct device *dev)
> +{
> + int ret;
> +
> + ret = of_parse_opp_table(dev, "operating-points", false);
> + if (!ret) {
> + ret = of_parse_opp_table(dev, "boost-opp", true);
> + if (ret == -ENODEV)
> + ret = 0;
> + }
> + return ret;
> +}
> EXPORT_SYMBOL_GPL(of_init_opp_table);
> #endif
>
--
Regards,
Nishanth Menon
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