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authorDmitry Osipenko <digetx@gmail.com>2021-06-01 05:31:18 +0300
committerThierry Reding <treding@nvidia.com>2021-06-02 10:58:55 +0200
commit41bafa698ddd07533914f34aeb432e762ed0cd30 (patch)
tree2b5643b55937815d6f0dd85a8bcf7072992f0eef /drivers/soc/tegra
parentf880ee9e96887786dc21e9433ede1719bc3b2624 (diff)
soc/tegra: pmc: Add driver state syncing
Add driver state syncing that is invoked once all PMC consumers are attached and ready. The consumers are the power domain clients. The synchronization callback is invoked once all client drivers are probed, the driver core handles this for us. This callback informs PMC driver that all voltage votes are initialized by each PD client and it's safe to begin voltage scaling of the core power domain. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> [treding@nvidia.com: squash DT backwards-compatibility patch] Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'drivers/soc/tegra')
-rw-r--r--drivers/soc/tegra/pmc.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index ceceb1709e0a..2ace21db4ae8 100644
--- a/drivers/soc/tegra/pmc.c
+++ b/drivers/soc/tegra/pmc.c
@@ -429,6 +429,9 @@ struct tegra_pmc {
struct irq_chip irq;
struct notifier_block clk_nb;
+
+ bool core_domain_state_synced;
+ bool core_domain_registered;
};
static struct tegra_pmc *pmc = &(struct tegra_pmc) {
@@ -1303,6 +1306,11 @@ free_mem:
return err;
}
+bool tegra_pmc_core_domain_state_synced(void)
+{
+ return pmc->core_domain_state_synced;
+}
+
static int
tegra_pmc_core_pd_set_performance_state(struct generic_pm_domain *genpd,
unsigned int level)
@@ -1370,6 +1378,8 @@ static int tegra_pmc_core_pd_add(struct tegra_pmc *pmc, struct device_node *np)
goto remove_genpd;
}
+ pmc->core_domain_registered = true;
+
return 0;
remove_genpd:
@@ -3782,6 +3792,29 @@ static const struct of_device_id tegra_pmc_match[] = {
{ }
};
+static void tegra_pmc_sync_state(struct device *dev)
+{
+ int err;
+
+ /*
+ * Older device-trees don't have core PD, and thus, there are
+ * no dependencies that will block the state syncing. We shouldn't
+ * mark the domain as synced in this case.
+ */
+ if (!pmc->core_domain_registered)
+ return;
+
+ pmc->core_domain_state_synced = true;
+
+ /* this is a no-op if core regulator isn't used */
+ mutex_lock(&pmc->powergates_lock);
+ err = dev_pm_opp_sync_regulators(dev);
+ mutex_unlock(&pmc->powergates_lock);
+
+ if (err)
+ dev_err(dev, "failed to sync regulators: %d\n", err);
+}
+
static struct platform_driver tegra_pmc_driver = {
.driver = {
.name = "tegra-pmc",
@@ -3790,6 +3823,7 @@ static struct platform_driver tegra_pmc_driver = {
#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_ARM)
.pm = &tegra_pmc_pm_ops,
#endif
+ .sync_state = tegra_pmc_sync_state,
},
.probe = tegra_pmc_probe,
};