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Power management update for 5.7-rc2 

Allow the operating performance points (OPP) core to be used in
 the case when the same driver is used on different platforms,
 some of which have an OPP table and some of which have a clock
 node (Rajendra Nayak).
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Merge tag 'pm-5.7-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management update from Rafael Wysocki:
 "Allow the operating performance points (OPP) core to be used in the
  case when the same driver is used on different platforms, some of
  which have an OPP table and some of which have a clock node (Rajendra
  Nayak)"

* tag 'pm-5.7-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  opp: Manage empty OPP tables with clk handle
This commit is contained in:
Linus Torvalds 2020-04-17 09:56:28 -07:00
parent c8a6552ff1 2c127c46ec
commit 5a32fe48bc
1 changed files with 14 additions and 0 deletions
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14
drivers/opp/core.c
View File

@ -819,6 +819,8 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
if (unlikely(!target_freq)) {
if (opp_table->required_opp_tables) {
ret = _set_required_opps(dev, opp_table, NULL);
} else if (!_get_opp_count(opp_table)) {
return 0;
} else {
dev_err(dev, "target frequency can't be 0\n");
ret = -EINVAL;
@ -849,6 +851,18 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
goto put_opp_table;
}
/*
* For IO devices which require an OPP on some platforms/SoCs
* while just needing to scale the clock on some others
* we look for empty OPP tables with just a clock handle and
* scale only the clk. This makes dev_pm_opp_set_rate()
* equivalent to a clk_set_rate()
*/
if (!_get_opp_count(opp_table)) {
ret = _generic_set_opp_clk_only(dev, clk, freq);
goto put_opp_table;
}
temp_freq = old_freq;
old_opp = _find_freq_ceil(opp_table, &temp_freq);
if (IS_ERR(old_opp)) {