usb: chipidea: tegra: Support runtime PM

Tegra PHY driver now supports waking up controller from a low power mode.
Enable runtime PM in order to put controller into the LPM during idle.
Tested-by: Matt Merhar <mattmerhar@protonmail.com>
Tested-by: Nicolas Chauvet <kwizart@gmail.com>
Tested-by: Peter Geis <pgwipeout@gmail.com>
Tested-by: Ion Agorria <ion@agorria.com>
Acked-by: Peter Chen <peter.chen@kernel.org>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20201218120246.7759-7-digetx@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/chipidea/ci_hdrc_tegra.c

@@ -38,21 +38,24 @@ struct tegra_usb_soc_info {
 
 static const struct tegra_usb_soc_info tegra20_ehci_soc_info = {
 	.flags = CI_HDRC_REQUIRES_ALIGNED_DMA |
-		 CI_HDRC_OVERRIDE_PHY_CONTROL,
+		 CI_HDRC_OVERRIDE_PHY_CONTROL |
+		 CI_HDRC_SUPPORTS_RUNTIME_PM,
 	.dr_mode = USB_DR_MODE_HOST,
 	.txfifothresh = 10,
 };
 
 static const struct tegra_usb_soc_info tegra30_ehci_soc_info = {
 	.flags = CI_HDRC_REQUIRES_ALIGNED_DMA |
-		 CI_HDRC_OVERRIDE_PHY_CONTROL,
+		 CI_HDRC_OVERRIDE_PHY_CONTROL |
+		 CI_HDRC_SUPPORTS_RUNTIME_PM,
 	.dr_mode = USB_DR_MODE_HOST,
 	.txfifothresh = 16,
 };
 
 static const struct tegra_usb_soc_info tegra_udc_soc_info = {
 	.flags = CI_HDRC_REQUIRES_ALIGNED_DMA |
-		 CI_HDRC_OVERRIDE_PHY_CONTROL,
+		 CI_HDRC_OVERRIDE_PHY_CONTROL |
+		 CI_HDRC_SUPPORTS_RUNTIME_PM,
 	.dr_mode = USB_DR_MODE_UNKNOWN,
 };
 
@@ -323,6 +326,10 @@ static int tegra_usb_probe(struct platform_device *pdev)
 	usb->data.hub_control = tegra_ehci_hub_control;
 	usb->data.notify_event = tegra_usb_notify_event;
 
+	/* Tegra PHY driver currently doesn't support LPM for ULPI */
+	if (of_usb_get_phy_mode(pdev->dev.of_node) == USBPHY_INTERFACE_MODE_ULPI)
+		usb->data.flags &= ~CI_HDRC_SUPPORTS_RUNTIME_PM;
+
 	usb->dev = ci_hdrc_add_device(&pdev->dev, pdev->resource,
 				      pdev->num_resources, &usb->data);
 	if (IS_ERR(usb->dev)) {