release/5.2.31/usb-host-xhci-tegra-Correct-phy-enable-sequence.patch

From 1d2b3bb8de45136c89d02e7030d4f5dce7f4061d Mon Sep 17 00:00:00 2001
From: Nagarjuna Kristam <nkristam@nvidia.com>
Date: Mon, 4 Nov 2019 14:54:30 +0530
Subject: [PATCH] usb: host: xhci-tegra: Correct phy enable sequence

commit 6351653febbb784d86fdf83afe41f7523a61b392 upstream.

XUSB phy needs to be enabled before un-powergating the power partitions.
However in the current sequence, it happens opposite. Correct the phy
enable and powergating partition sequence to avoid any boot hangs.

Signed-off-by: Nagarjuna Kristam <nkristam@nvidia.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Jui Chang Kuo <jckuo@nvidia.com>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/1572859470-7823-1-git-send-email-nkristam@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c
index 77142f9bf26a..ef3023eaf1ef 100644
--- a/drivers/usb/host/xhci-tegra.c
+++ b/drivers/usb/host/xhci-tegra.c
@@ -778,7 +778,6 @@ static int tegra_xusb_runtime_suspend(struct device *dev)
 {
 	struct tegra_xusb *tegra = dev_get_drvdata(dev);
 
-	tegra_xusb_phy_disable(tegra);
 	regulator_bulk_disable(tegra->soc->num_supplies, tegra->supplies);
 	tegra_xusb_clk_disable(tegra);
 
@@ -802,16 +801,8 @@ static int tegra_xusb_runtime_resume(struct device *dev)
 		goto disable_clk;
 	}
 
-	err = tegra_xusb_phy_enable(tegra);
-	if (err < 0) {
-		dev_err(dev, "failed to enable PHYs: %d\n", err);
-		goto disable_regulator;
-	}
-
 	return 0;
 
-disable_regulator:
-	regulator_bulk_disable(tegra->soc->num_supplies, tegra->supplies);
 disable_clk:
 	tegra_xusb_clk_disable(tegra);
 	return err;
@@ -1204,6 +1195,12 @@ static int tegra_xusb_probe(struct platform_device *pdev)
 	 */
 	platform_set_drvdata(pdev, tegra);
 
+	err = tegra_xusb_phy_enable(tegra);
+	if (err < 0) {
+		dev_err(&pdev->dev, "failed to enable PHYs: %d\n", err);
+		goto put_hcd;
+	}
+
 	pm_runtime_enable(&pdev->dev);
 	if (pm_runtime_enabled(&pdev->dev))
 		err = pm_runtime_get_sync(&pdev->dev);
@@ -1212,7 +1209,7 @@ static int tegra_xusb_probe(struct platform_device *pdev)
 
 	if (err < 0) {
 		dev_err(&pdev->dev, "failed to enable device: %d\n", err);
-		goto disable_rpm;
+		goto disable_phy;
 	}
 
 	tegra_xusb_config(tegra, regs);
@@ -1298,9 +1295,11 @@ static int tegra_xusb_probe(struct platform_device *pdev)
 put_rpm:
 	if (!pm_runtime_status_suspended(&pdev->dev))
 		tegra_xusb_runtime_suspend(&pdev->dev);
-disable_rpm:
-	pm_runtime_disable(&pdev->dev);
+put_hcd:
 	usb_put_hcd(tegra->hcd);
+disable_phy:
+	tegra_xusb_phy_disable(tegra);
+	pm_runtime_disable(&pdev->dev);
 put_powerdomains:
 	if (!of_property_read_bool(pdev->dev.of_node, "power-domains")) {
 		tegra_powergate_power_off(TEGRA_POWERGATE_XUSBC);
@@ -1337,6 +1336,8 @@ static int tegra_xusb_remove(struct platform_device *pdev)
 		tegra_xusb_powerdomain_remove(&pdev->dev, tegra);
 	}
 
+	tegra_xusb_phy_disable(tegra);
+
 	tegra_xusb_padctl_put(tegra->padctl);
 
 	return 0;
-- 
2.7.4