diff options
author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-11-11 22:06:52 +0100 |
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committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-11-11 22:06:52 +0100 |
commit | 16c71c51132847fb260e6b7e741bf6d241a8b9df (patch) | |
tree | 70a737d2eed2c9f21db1b9ab44f27ac135cb7c23 /drivers | |
parent | 31f4f5b495a62c9a8b15b1c3581acd5efeb9af8c (diff) | |
parent | 25cb20a212a1f989385dfe23230817e69c62bee5 (diff) |
Merge branch 'opp/linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm
Pull operating performance points (OPP) framework update for v5.5
from Viresh Kumar:
"This pull request contains a single patch to allow modification of
the OPP voltages at run time."
* 'opp/linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm:
PM / OPP: Support adjusting OPP voltages at runtime
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/opp/core.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/drivers/opp/core.c b/drivers/opp/core.c index 9ff0538ee83a..be7a7d332332 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -2103,6 +2103,75 @@ put_table: } /** + * dev_pm_opp_adjust_voltage() - helper to change the voltage of an OPP + * @dev: device for which we do this operation + * @freq: OPP frequency to adjust voltage of + * @u_volt: new OPP target voltage + * @u_volt_min: new OPP min voltage + * @u_volt_max: new OPP max voltage + * + * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the + * copy operation, returns 0 if no modifcation was done OR modification was + * successful. + */ +int dev_pm_opp_adjust_voltage(struct device *dev, unsigned long freq, + unsigned long u_volt, unsigned long u_volt_min, + unsigned long u_volt_max) + +{ + struct opp_table *opp_table; + struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV); + int r = 0; + + /* Find the opp_table */ + opp_table = _find_opp_table(dev); + if (IS_ERR(opp_table)) { + r = PTR_ERR(opp_table); + dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r); + return r; + } + + mutex_lock(&opp_table->lock); + + /* Do we have the frequency? */ + list_for_each_entry(tmp_opp, &opp_table->opp_list, node) { + if (tmp_opp->rate == freq) { + opp = tmp_opp; + break; + } + } + + if (IS_ERR(opp)) { + r = PTR_ERR(opp); + goto adjust_unlock; + } + + /* Is update really needed? */ + if (opp->supplies->u_volt == u_volt) + goto adjust_unlock; + + opp->supplies->u_volt = u_volt; + opp->supplies->u_volt_min = u_volt_min; + opp->supplies->u_volt_max = u_volt_max; + + dev_pm_opp_get(opp); + mutex_unlock(&opp_table->lock); + + /* Notify the voltage change of the OPP */ + blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADJUST_VOLTAGE, + opp); + + dev_pm_opp_put(opp); + goto adjust_put_table; + +adjust_unlock: + mutex_unlock(&opp_table->lock); +adjust_put_table: + dev_pm_opp_put_opp_table(opp_table); + return r; +} + +/** * dev_pm_opp_enable() - Enable a specific OPP * @dev: device for which we do this operation * @freq: OPP frequency to enable |