Commit 7fe5719b authored by Thierry Reding's avatar Thierry Reding
Browse files

soc/tegra: pmc: Implement acquire/release for resets 



By implementing the acquire/release protocol, the resets can be shared
with other drivers that also adhere to this protocol. This will be used
for example by the SOR driver to put hardware into a known good state,
irrespective of whether or not the power domain can be reset.

Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent 41c4f599

drivers/soc/tegra/pmc.c

+33 −6
Original line number Diff line number Diff line
@@ -656,10 +656,15 @@ static int tegra_genpd_power_on(struct generic_pm_domain *domain) 
	int err;



	err = tegra_powergate_power_up(pg, true);

	if (err)

	if (err) {

		dev_err(dev, "failed to turn on PM domain %s: %d\n",

			pg->genpd.name, err);

		goto out;

	}



	reset_control_release(pg->reset);



out:

	return err;

}
@@ -669,10 +674,18 @@ static int tegra_genpd_power_off(struct generic_pm_domain *domain) 
	struct device *dev = pg->pmc->dev;

	int err;



	err = reset_control_acquire(pg->reset);

	if (err < 0) {

		pr_err("failed to acquire resets: %d\n", err);

		return err;

	}



	err = tegra_powergate_power_down(pg);

	if (err)

	if (err) {

		dev_err(dev, "failed to turn off PM domain %s: %d\n",

			pg->genpd.name, err);

		reset_control_release(pg->reset);

	}



	return err;

}
@@ -937,20 +950,34 @@ static int tegra_powergate_of_get_resets(struct tegra_powergate *pg, 
	struct device *dev = pg->pmc->dev;

	int err;



	pg->reset = of_reset_control_array_get_exclusive(np);

	pg->reset = of_reset_control_array_get_exclusive_released(np);

	if (IS_ERR(pg->reset)) {

		err = PTR_ERR(pg->reset);

		dev_err(dev, "failed to get device resets: %d\n", err);

		return err;

	}



	if (off)

	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

	} else {

		err = reset_control_deassert(pg->reset);

		if (err < 0)

			goto out;



	if (err)

		reset_control_release(pg->reset);

	}



out:

	if (err) {

		reset_control_release(pg->reset);

		reset_control_put(pg->reset);

	}



	return err;

}

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