From: Dmitry Osipenko <digetx@gmail.com>
Date: Mon, 6 Jan 2020 04:34:01 +0300
Subject: usb: phy: tegra: Hook up init/shutdown callbacks

Git-commit: 5dcdafdd30b1babde143ee7086d3de79396d023b
Patch-mainline: v5.6-rc1
References: jsc#SLE-15847

Generic PHY provides init/shutdown callbacks which allow USB-host drivers
to abstract PHY's hardware management in a common way. This change allows
to remove Tegra-specific PHY handling from the ChipIdea driver.

Note that ChipIdea's driver shall be changed at the same time because it
turns PHY ON without the PHY's initialization and this doesn't work now,
resulting in a NULL dereference of phy->freq because it's set during of
the PHY's initialization.

Acked-by: Peter Chen <peter.chen@nxp.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20200106013416.9604-6-digetx@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
 drivers/usb/phy/phy-tegra-usb.c | 180 +++++++++++++++++++-------------
 1 file changed, 110 insertions(+), 70 deletions(-)

diff --git a/drivers/usb/phy/phy-tegra-usb.c b/drivers/usb/phy/phy-tegra-usb.c
index 88466c7f13e6..664259d74658 100644
--- a/drivers/usb/phy/phy-tegra-usb.c
+++ b/drivers/usb/phy/phy-tegra-usb.c
@@ -238,23 +238,6 @@ static int utmip_pad_open(struct tegra_usb_phy *phy)
 {
 	int ret;
 
-	phy->pad_clk = devm_clk_get(phy->u_phy.dev, "utmi-pads");
-	if (IS_ERR(phy->pad_clk)) {
-		ret = PTR_ERR(phy->pad_clk);
-		dev_err(phy->u_phy.dev,
-			"Failed to get UTMIP pad clock: %d\n", ret);
-		return ret;
-	}
-
-	phy->pad_rst = devm_reset_control_get_optional_shared(
-						phy->u_phy.dev, "utmi-pads");
-	if (IS_ERR(phy->pad_rst)) {
-		ret = PTR_ERR(phy->pad_rst);
-		dev_err(phy->u_phy.dev,
-			"Failed to get UTMI-pads reset: %d\n", ret);
-		return ret;
-	}
-
 	ret = clk_prepare_enable(phy->pad_clk);
 	if (ret) {
 		dev_err(phy->u_phy.dev,
@@ -772,17 +755,6 @@ static int ulpi_phy_power_off(struct tegra_usb_phy *phy)
 	return 0;
 }
 
-static void tegra_usb_phy_close(struct tegra_usb_phy *phy)
-{
-	if (!IS_ERR(phy->vbus))
-		regulator_disable(phy->vbus);
-
-	if (!phy->is_ulpi_phy)
-		utmip_pad_close(phy);
-
-	clk_disable_unprepare(phy->pll_u);
-}
-
 static int tegra_usb_phy_power_on(struct tegra_usb_phy *phy)
 {
 	int err;
@@ -821,9 +793,34 @@ static int tegra_usb_phy_power_off(struct tegra_usb_phy *phy)
 	return 0;
 }
 
-static int	tegra_usb_phy_suspend(struct usb_phy *x, int suspend)
+static void tegra_usb_phy_shutdown(struct usb_phy *u_phy)
+{
+	struct tegra_usb_phy *phy = container_of(u_phy, struct tegra_usb_phy,
+						 u_phy);
+
+	if (WARN_ON(!phy->freq))
+		return;
+
+	tegra_usb_phy_power_off(phy);
+
+	if (!phy->is_ulpi_phy)
+		utmip_pad_close(phy);
+
+	if (!IS_ERR(phy->vbus))
+		regulator_disable(phy->vbus);
+
+	clk_disable_unprepare(phy->pll_u);
+
+	phy->freq = NULL;
+}
+
+static int tegra_usb_phy_set_suspend(struct usb_phy *x, int suspend)
 {
 	struct tegra_usb_phy *phy = container_of(x, struct tegra_usb_phy, u_phy);
+
+	if (WARN_ON(!phy->freq))
+		return -EINVAL;
+
 	if (suspend)
 		return tegra_usb_phy_power_off(phy);
 	else
@@ -834,53 +831,27 @@ static int ulpi_open(struct tegra_usb_phy *phy)
 {
 	int err;
 
-	phy->clk = devm_clk_get(phy->u_phy.dev, "ulpi-link");
-	if (IS_ERR(phy->clk)) {
-		err = PTR_ERR(phy->clk);
-		dev_err(phy->u_phy.dev, "Failed to get ULPI clock: %d\n", err);
-		return err;
-	}
-
-	err = devm_gpio_request(phy->u_phy.dev, phy->reset_gpio,
-		"ulpi_phy_reset_b");
-	if (err < 0) {
-		dev_err(phy->u_phy.dev, "Request failed for GPIO %d: %d\n",
-			phy->reset_gpio, err);
-		return err;
-	}
-
 	err = gpio_direction_output(phy->reset_gpio, 0);
 	if (err < 0) {
 		dev_err(phy->u_phy.dev,
-			"GPIO %d direction not set to output: %d\n",
+			"ULPI reset GPIO %d direction not asserted: %d\n",
 			phy->reset_gpio, err);
 		return err;
 	}
 
-	phy->ulpi = otg_ulpi_create(&ulpi_viewport_access_ops, 0);
-	if (!phy->ulpi) {
-		dev_err(phy->u_phy.dev, "Failed to create ULPI OTG\n");
-		err = -ENOMEM;
-		return err;
-	}
-
-	phy->ulpi->io_priv = phy->regs + ULPI_VIEWPORT;
 	return 0;
 }
 
-static int tegra_usb_phy_init(struct tegra_usb_phy *phy)
+static int tegra_usb_phy_init(struct usb_phy *u_phy)
 {
+	struct tegra_usb_phy *phy = container_of(u_phy, struct tegra_usb_phy,
+						 u_phy);
 	unsigned long parent_rate;
 	int i;
 	int err;
 
-	phy->pll_u = devm_clk_get(phy->u_phy.dev, "pll_u");
-	if (IS_ERR(phy->pll_u)) {
-		err = PTR_ERR(phy->pll_u);
-		dev_err(phy->u_phy.dev,
-			"Failed to get pll_u clock: %d\n", err);
-		return err;
-	}
+	if (WARN_ON(phy->freq))
+		return 0;
 
 	err = clk_prepare_enable(phy->pll_u);
 	if (err)
@@ -917,10 +888,20 @@ static int tegra_usb_phy_init(struct tegra_usb_phy *phy)
 	if (err < 0)
 		goto fail;
 
+	err = tegra_usb_phy_power_on(phy);
+	if (err)
+		goto close_phy;
+
 	return 0;
 
+close_phy:
+	if (!phy->is_ulpi_phy)
+		utmip_pad_close(phy);
 fail:
 	clk_disable_unprepare(phy->pll_u);
+
+	phy->freq = NULL;
+
 	return err;
 }
 
@@ -1167,22 +1148,77 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
 		tegra_phy->vbus = ERR_PTR(-ENODEV);
 	}
 
-	tegra_phy->u_phy.dev = &pdev->dev;
-	err = tegra_usb_phy_init(tegra_phy);
-	if (err < 0)
+	tegra_phy->pll_u = devm_clk_get(&pdev->dev, "pll_u");
+	err = PTR_ERR_OR_ZERO(tegra_phy->pll_u);
+	if (err) {
+		dev_err(&pdev->dev, "Failed to get pll_u clock: %d\n", err);
 		return err;
+	}
+
+	if (tegra_phy->is_ulpi_phy) {
+		tegra_phy->clk = devm_clk_get(&pdev->dev, "ulpi-link");
+		err = PTR_ERR_OR_ZERO(tegra_phy->clk);
+		if (err) {
+			dev_err(&pdev->dev,
+				"Failed to get ULPI clock: %d\n", err);
+			return err;
+		}
 
-	tegra_phy->u_phy.set_suspend = tegra_usb_phy_suspend;
+		err = devm_gpio_request(&pdev->dev, tegra_phy->reset_gpio,
+			"ulpi_phy_reset_b");
+		if (err < 0) {
+			dev_err(&pdev->dev, "Request failed for GPIO %d: %d\n",
+				tegra_phy->reset_gpio, err);
+			return err;
+		}
+
+		tegra_phy->ulpi = otg_ulpi_create(&ulpi_viewport_access_ops, 0);
+		if (!tegra_phy->ulpi) {
+			dev_err(&pdev->dev, "Failed to create ULPI OTG\n");
+			err = -ENOMEM;
+			return err;
+		}
+
+		tegra_phy->ulpi->io_priv = tegra_phy->regs + ULPI_VIEWPORT;
+	} else {
+		tegra_phy->pad_clk = devm_clk_get(&pdev->dev, "utmi-pads");
+		err = PTR_ERR_OR_ZERO(tegra_phy->pad_clk);
+		if (err) {
+			dev_err(&pdev->dev,
+				"Failed to get UTMIP pad clock: %d\n", err);
+			return err;
+		}
+
+		tegra_phy->pad_rst = devm_reset_control_get_optional_shared(
+						&pdev->dev, "utmi-pads");
+		err = PTR_ERR_OR_ZERO(tegra_phy->pad_rst);
+		if (err) {
+			dev_err(&pdev->dev,
+				"Failed to get UTMI-pads reset: %d\n", err);
+			return err;
+		}
+	}
+
+	tegra_phy->u_phy.dev = &pdev->dev;
+	tegra_phy->u_phy.init = tegra_usb_phy_init;
+	tegra_phy->u_phy.shutdown = tegra_usb_phy_shutdown;
+	tegra_phy->u_phy.set_suspend = tegra_usb_phy_set_suspend;
 
 	platform_set_drvdata(pdev, tegra_phy);
 
 	err = usb_add_phy_dev(&tegra_phy->u_phy);
-	if (err < 0) {
-		tegra_usb_phy_close(tegra_phy);
-		return err;
-	}
+	if (err < 0)
+		goto free_ulpi;
 
 	return 0;
+
+free_ulpi:
+	if (tegra_phy->ulpi) {
+		kfree(tegra_phy->ulpi->otg);
+		kfree(tegra_phy->ulpi);
+	}
+
+	return err;
 }
 
 static int tegra_usb_phy_remove(struct platform_device *pdev)
@@ -1190,7 +1226,11 @@ static int tegra_usb_phy_remove(struct platform_device *pdev)
 	struct tegra_usb_phy *tegra_phy = platform_get_drvdata(pdev);
 
 	usb_remove_phy(&tegra_phy->u_phy);
-	tegra_usb_phy_close(tegra_phy);
+
+	if (tegra_phy->ulpi) {
+		kfree(tegra_phy->ulpi->otg);
+		kfree(tegra_phy->ulpi);
+	}
 
 	return 0;
 }
-- 
2.26.2