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- tegra: Ensure pmc power-domains are in a known state
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Merge tag 'pmdomain-v6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/linux-pm

Pull pmdomain fix from Ulf Hansson:

 - tegra: Ensure pmc power-domains are in a known state

* tag 'pmdomain-v6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/linux-pm:
  soc/tegra: pmc: Ensure power-domains are in a known state
This commit is contained in:
Linus Torvalds 2025-08-15 06:30:53 -07:00
commit 66ba63d4d8
1 changed files with 29 additions and 22 deletions
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51
drivers/soc/tegra/pmc.c
View File

@ -1232,7 +1232,7 @@ static int tegra_powergate_of_get_clks(struct tegra_powergate *pg,
}
static int tegra_powergate_of_get_resets(struct tegra_powergate *pg,
struct device_node *np, bool off)
struct device_node *np)
{
struct device *dev = pg->pmc->dev;
int err;
@ -1247,22 +1247,6 @@ static int tegra_powergate_of_get_resets(struct tegra_powergate *pg,
err = reset_control_acquire(pg->reset);
if (err < 0) {
pr_err("failed to acquire resets: %d\n", err);
goto out;
}
if (off) {
err = reset_control_assert(pg->reset);
} else {
err = reset_control_deassert(pg->reset);
if (err < 0)
goto out;
reset_control_release(pg->reset);
}
out:
if (err) {
reset_control_release(pg->reset);
reset_control_put(pg->reset);
}
@ -1308,20 +1292,43 @@ static int tegra_powergate_add(struct tegra_pmc *pmc, struct device_node *np)
goto set_available;
}
err = tegra_powergate_of_get_resets(pg, np, off);
err = tegra_powergate_of_get_resets(pg, np);
if (err < 0) {
dev_err(dev, "failed to get resets for %pOFn: %d\n", np, err);
goto remove_clks;
}
if (!IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS)) {
if (off)
WARN_ON(tegra_powergate_power_up(pg, true));
/*
* If the power-domain is off, then ensure the resets are asserted.
* If the power-domain is on, then power down to ensure that when is
* it turned on the power-domain, clocks and resets are all in the
* expected state.
*/
if (off) {
err = reset_control_assert(pg->reset);
if (err) {
pr_err("failed to assert resets: %d\n", err);
goto remove_resets;
}
} else {
err = tegra_powergate_power_down(pg);
if (err) {
dev_err(dev, "failed to turn off PM domain %s: %d\n",
pg->genpd.name, err);
goto remove_resets;
}
}
/*
* If PM_GENERIC_DOMAINS is not enabled, power-on
* the domain and skip the genpd registration.
*/
if (!IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS)) {
WARN_ON(tegra_powergate_power_up(pg, true));
goto remove_resets;
}
err = pm_genpd_init(&pg->genpd, NULL, off);
err = pm_genpd_init(&pg->genpd, NULL, true);
if (err < 0) {
dev_err(dev, "failed to initialise PM domain %pOFn: %d\n", np,
err);