On Thu, 2019-02-21 at 16:25 +0100, Thierry Reding wrote:
> From: Thierry Reding <tred...@nvidia.com>
>
> 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: Thierry Reding <tred...@nvidia.com>
> ---
> drivers/soc/tegra/pmc.c | 39 +++++++++++++++++++++++++++++++++------
> 1 file changed, 33 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
> index 0df258518693..0c5f79528e5f 100644
> --- a/drivers/soc/tegra/pmc.c
> +++ b/drivers/soc/tegra/pmc.c
> @@ -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;
> }
Reviewed-by: Philipp Zabel <p.za...@pengutronix.de>
regards
Philipp
