[PATCH v8 17/34] usb: chipidea: tegra: Add runtime PM and OPP support

[Dmitry Osipenko]

The Tegra USB controller belongs to the core power domain and we're going
to enable GENPD support for the core domain. Now USB controller must be
resumed using runtime PM API in order to initialize the USB power state.
We already support runtime PM for the CI device, but CI's PM is separated
from the RPM managed by tegra-usb driver. Add runtime PM and OPP support
to tegra-usb driver.

Signed-off-by: Dmitry Osipenko <digetx at gmail.com>
---
 drivers/usb/chipidea/ci_hdrc_tegra.c | 61 ++++++++++++++++++++++++----
 1 file changed, 54 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/chipidea/ci_hdrc_tegra.c b/drivers/usb/chipidea/ci_hdrc_tegra.c
index 60361141ac04..09a5e5fc251f 100644
--- a/drivers/usb/chipidea/ci_hdrc_tegra.c
+++ b/drivers/usb/chipidea/ci_hdrc_tegra.c
@@ -7,6 +7,8 @@
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
+#include <linux/pm_opp.h>
+#include <linux/pm_runtime.h>
 #include <linux/reset.h>
 
 #include <linux/usb.h>
@@ -15,6 +17,8 @@
 #include <linux/usb/of.h>
 #include <linux/usb/phy.h>
 
+#include <soc/tegra/common.h>
+
 #include "../host/ehci.h"
 
 #include "ci.h"
@@ -278,6 +282,8 @@ static int tegra_usb_probe(struct platform_device *pdev)
 	if (!usb)
 		return -ENOMEM;
 
+	platform_set_drvdata(pdev, usb);
+
 	soc = of_device_get_match_data(&pdev->dev);
 	if (!soc) {
 		dev_err(&pdev->dev, "failed to match OF data\n");
@@ -296,11 +302,14 @@ static int tegra_usb_probe(struct platform_device *pdev)
 		return err;
 	}
 
-	err = clk_prepare_enable(usb->clk);
-	if (err < 0) {
-		dev_err(&pdev->dev, "failed to enable clock: %d\n", err);
+	err = devm_tegra_core_dev_init_opp_table_simple(&pdev->dev);
+	if (err)
 		return err;
-	}
+
+	pm_runtime_enable(&pdev->dev);
+	err = pm_runtime_resume_and_get(&pdev->dev);
+	if (err)
+		goto disable_pm;
 
 	if (device_property_present(&pdev->dev, "nvidia,needs-double-reset"))
 		usb->needs_double_reset = true;
@@ -320,8 +329,6 @@ static int tegra_usb_probe(struct platform_device *pdev)
 	if (err)
 		goto fail_power_off;
 
-	platform_set_drvdata(pdev, usb);
-
 	/* setup and register ChipIdea HDRC device */
 	usb->soc = soc;
 	usb->data.name = "tegra-usb";
@@ -350,7 +357,10 @@ static int tegra_usb_probe(struct platform_device *pdev)
 phy_shutdown:
 	usb_phy_shutdown(usb->phy);
 fail_power_off:
-	clk_disable_unprepare(usb->clk);
+	pm_runtime_put(&pdev->dev);
+disable_pm:
+	pm_runtime_disable(&pdev->dev);
+
 	return err;
 }
 
@@ -360,15 +370,52 @@ static int tegra_usb_remove(struct platform_device *pdev)
 
 	ci_hdrc_remove_device(usb->dev);
 	usb_phy_shutdown(usb->phy);
+
+	pm_runtime_put(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+
+	return 0;
+}
+
+static int __maybe_unused tegra_usb_runtime_resume(struct device *dev)
+{
+	struct tegra_usb *usb = dev_get_drvdata(dev);
+	int err;
+
+	err = dev_pm_opp_sync(dev);
+	if (err) {
+		dev_err(dev, "failed to sync OPP: %d\n", err);
+		return err;
+	}
+
+	err = clk_prepare_enable(usb->clk);
+	if (err < 0) {
+		dev_err(dev, "failed to enable clock: %d\n", err);
+		return err;
+	}
+
+	return 0;
+}
+
+static int __maybe_unused tegra_usb_runtime_suspend(struct device *dev)
+{
+	struct tegra_usb *usb = dev_get_drvdata(dev);
+
 	clk_disable_unprepare(usb->clk);
 
 	return 0;
 }
 
+static const struct dev_pm_ops tegra_usb_pm = {
+	SET_RUNTIME_PM_OPS(tegra_usb_runtime_suspend, tegra_usb_runtime_resume,
+			   NULL)
+};
+
 static struct platform_driver tegra_usb_driver = {
 	.driver = {
 		.name = "tegra-usb",
 		.of_match_table = tegra_usb_of_match,
+		.pm = &tegra_usb_pm,
 	},
 	.probe = tegra_usb_probe,
 	.remove = tegra_usb_remove,
-- 
2.32.0