[PATCH v3 00/16] NVIDIA Tegra USB2 drivers clean up

[PATCH v3 00/16] NVIDIA Tegra USB2 drivers clean up

[Dmitry Osipenko]

Hello,

This patch series brings the NVIDIA Tegra USB2 PHY driver into a better
shape by refactoring code to match upstream standards, the ChipIdea/Tegra UDC
driver also gets a minor update. Please review and apply, thanks in advance!

Changelog:

v3: - The "Perform general clean up of the code" patch now cleans up couple
      more minor crumbs.

    - Added more "clean up" patches:

        usb: phy: tegra: Disable VBUS regulator on tegra_usb_phy_init failure
        usb: phy: tegra: Move utmip_pad_count checking under lock
        usb: phy: tegra: Keep CPU interrupts enabled
        usb: host: ehci-tegra: Remove unused fields from tegra_ehci_hcd

    - I noticed that ULPI's reset is getting erroneously deasserted on
      PHY's shutdown, this is fixed in these new patches:

        usb: phy: tegra: Assert reset on ULPI close instead of deasserting it
        usb: phy: tegra: Use device-tree notion of reset-GPIO's active-state

v2: - The "usb: phy: tegra: Hook up init/shutdown callbacks" patch was
      updated and now it does a better job in regards to checking whether
      PHY is initialized before it is started to be used and whether there
      is a double init/shutdown. This allows to factor out the ChipIdea's
      driver change into a separate patch, which was requested by Peter Chen
      in a review comment to v1. In a result there is this new patch:

        usb: chipidea: tegra: Stop managing PHY's power

    - Added few more new patches:

        usb: phy: tegra: Use generic stub for a missing VBUS regulator

      I noticed that VBUS regulator usage could be cleaned up a tad as well.

        usb: ulpi: Add resource-managed variant of otg_ulpi_create()
        usb: phy: tegra: Use devm_otg_ulpi_create()
        usb: phy: tegra: Use u32 for hardware register variables

      These patches are made in response to review comments that were made
      by Thierry Reding to v1.

      I also noticed that phy_tegra_usb isn't getting auto-loaded while it
      should be. This is fixed in this new patch:

        usb: chipidea: tegra: Add USB_TEGRA_PHY to driver's dependencies

Dmitry Osipenko (16):
  dt-binding: usb: ci-hdrc-usb2: Document NVIDIA Tegra support
  usb: phy: tegra: Hook up init/shutdown callbacks
  usb: phy: tegra: Perform general clean up of the code
  usb: phy: tegra: Use relaxed versions of readl/writel
  usb: phy: tegra: Use generic stub for a missing VBUS regulator
  usb: ulpi: Add resource-managed variant of otg_ulpi_create()
  usb: phy: tegra: Use devm_otg_ulpi_create()
  usb: phy: tegra: Use u32 for hardware register variables
  usb: phy: tegra: Assert reset on ULPI close instead of deasserting it
  usb: phy: tegra: Use device-tree notion of reset-GPIO's active-state
  usb: phy: tegra: Disable VBUS regulator on tegra_usb_phy_init failure
  usb: phy: tegra: Move utmip_pad_count checking under lock
  usb: phy: tegra: Keep CPU interrupts enabled
  usb: chipidea: tegra: Stop managing PHY's power
  usb: chipidea: tegra: Add USB_TEGRA_PHY to driver's dependencies
  usb: host: ehci-tegra: Remove unused fields from tegra_ehci_hcd

 .../devicetree/bindings/usb/ci-hdrc-usb2.txt  |   4 +
 drivers/usb/chipidea/Kconfig                  |   1 +
 drivers/usb/chipidea/ci_hdrc_tegra.c          |  15 +-
 drivers/usb/host/ehci-tegra.c                 |   2 -
 drivers/usb/phy/phy-tegra-usb.c               | 830 +++++++++---------
 drivers/usb/phy/phy-ulpi.c                    |  48 +-
 include/linux/usb/tegra_usb_phy.h             |   3 +-
 include/linux/usb/ulpi.h                      |  11 +
 8 files changed, 496 insertions(+), 418 deletions(-)

-- 
2.24.0

[PATCH v3 01/16] dt-binding: usb: ci-hdrc-usb2: Document NVIDIA Tegra support

[Dmitry Osipenko]

NVIDIA Tegra SoCs use ChipIdea silicon IP for the USB controllers.

Acked-by: Peter Chen <peter.chen@nxp.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
index cfc9f40ab641..51376cbe5f3d 100644
--- a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
+++ b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
@@ -15,6 +15,10 @@ Required properties:
 	"qcom,ci-hdrc"
 	"chipidea,usb2"
 	"xlnx,zynq-usb-2.20a"
+	"nvidia,tegra20-udc"
+	"nvidia,tegra30-udc"
+	"nvidia,tegra114-udc"
+	"nvidia,tegra124-udc"
 - reg: base address and length of the registers
 - interrupts: interrupt for the USB controller
 
-- 
2.24.0

Re: [PATCH v3 01/16] dt-binding: usb: ci-hdrc-usb2: Document NVIDIA Tegra support

[Rob Herring]

On Sat, 28 Dec 2019 23:33:43 +0300, Dmitry Osipenko wrote:
> NVIDIA Tegra SoCs use ChipIdea silicon IP for the USB controllers.
> 
> Acked-by: Peter Chen <peter.chen@nxp.com>
> Acked-by: Thierry Reding <treding@nvidia.com>
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
> ---
>  Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt | 4 ++++
>  1 file changed, 4 insertions(+)
> 

Acked-by: Rob Herring <robh@kernel.org>

Re: [PATCH v3 01/16] dt-binding: usb: ci-hdrc-usb2: Document NVIDIA Tegra support

[Dmitry Osipenko]

04.01.2020 03:33, Rob Herring пишет:
> On Sat, 28 Dec 2019 23:33:43 +0300, Dmitry Osipenko wrote:
>> NVIDIA Tegra SoCs use ChipIdea silicon IP for the USB controllers.
>>
>> Acked-by: Peter Chen <peter.chen@nxp.com>
>> Acked-by: Thierry Reding <treding@nvidia.com>
>> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
>> ---
>>  Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt | 4 ++++
>>  1 file changed, 4 insertions(+)
>>
> 
> Acked-by: Rob Herring <robh@kernel.org>
> 

Thanks!

[PATCH v3 02/16] usb: phy: tegra: Hook up init/shutdown callbacks

[Dmitry Osipenko]

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>
---
 drivers/usb/phy/phy-tegra-usb.c | 180 +++++++++++++++++++++-----------
 1 file changed, 117 insertions(+), 63 deletions(-)

diff --git a/drivers/usb/phy/phy-tegra-usb.c b/drivers/usb/phy/phy-tegra-usb.c
index ea7ef1dc0b42..d11d217e232b 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,
@@ -315,6 +298,18 @@ static int utmip_pad_close(struct tegra_usb_phy *phy)
 	return ret;
 }
 
+static void ulpi_close(struct tegra_usb_phy *phy)
+{
+	int err;
+
+	err = gpio_direction_output(phy->reset_gpio, 1);
+	if (err < 0) {
+		dev_err(phy->u_phy.dev,
+			"ULPI reset GPIO %d direction not asserted: %d\n",
+			phy->reset_gpio, err);
+	}
+}
+
 static void utmip_pad_power_on(struct tegra_usb_phy *phy)
 {
 	unsigned long val, flags;
@@ -761,15 +756,25 @@ static int ulpi_phy_power_off(struct tegra_usb_phy *phy)
 	return gpio_direction_output(phy->reset_gpio, 0);
 }
 
-static void tegra_usb_phy_close(struct tegra_usb_phy *phy)
+static void tegra_usb_phy_shutdown(struct usb_phy *u_phy)
 {
-	if (!IS_ERR(phy->vbus))
-		regulator_disable(phy->vbus);
+	struct tegra_usb_phy *phy = container_of(u_phy, struct tegra_usb_phy,
+						 u_phy);
 
-	if (!phy->is_ulpi_phy)
+	if (WARN_ON(!phy->freq))
+		return;
+
+	if (phy->is_ulpi_phy)
+		ulpi_close(phy);
+	else
 		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_power_on(struct tegra_usb_phy *phy)
@@ -788,9 +793,13 @@ static int tegra_usb_phy_power_off(struct tegra_usb_phy *phy)
 		return utmi_phy_power_off(phy);
 }
 
-static int	tegra_usb_phy_suspend(struct usb_phy *x, int suspend)
+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
@@ -801,53 +810,27 @@ 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 deasserted: %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)
@@ -884,10 +867,22 @@ 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)
+		ulpi_close(phy);
+	else
+		utmip_pad_close(phy);
 fail:
 	clk_disable_unprepare(phy->pll_u);
+
+	phy->freq = NULL;
+
 	return err;
 }
 
@@ -1134,22 +1129,77 @@ 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;
+		}
+
+		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.set_suspend = tegra_usb_phy_suspend;
+	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)
@@ -1157,7 +1207,11 @@ 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;
 }
-- 
2.24.0

[PATCH v3 03/16] usb: phy: tegra: Perform general clean up of the code

[Dmitry Osipenko]

This patch fixes few dozens of legit checkpatch warnings, adds missed
handling of potential error-cases, fixes ULPI clk-prepare refcounting and
prettifies code where makes sense. All these clean-up changes are quite
minor and do not fix any real problems.

Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/usb/phy/phy-tegra-usb.c | 486 +++++++++++++++++---------------
 1 file changed, 255 insertions(+), 231 deletions(-)

diff --git a/drivers/usb/phy/phy-tegra-usb.c b/drivers/usb/phy/phy-tegra-usb.c
index d11d217e232b..227757b8174c 100644
--- a/drivers/usb/phy/phy-tegra-usb.c
+++ b/drivers/usb/phy/phy-tegra-usb.c
@@ -28,35 +28,35 @@
 #include <linux/usb/tegra_usb_phy.h>
 #include <linux/regulator/consumer.h>
 
-#define ULPI_VIEWPORT		0x170
+#define ULPI_VIEWPORT				0x170
 
 /* PORTSC PTS/PHCD bits, Tegra20 only */
-#define TEGRA_USB_PORTSC1				0x184
-#define TEGRA_USB_PORTSC1_PTS(x)			(((x) & 0x3) << 30)
-#define TEGRA_USB_PORTSC1_PHCD				(1 << 23)
+#define TEGRA_USB_PORTSC1			0x184
+#define TEGRA_USB_PORTSC1_PTS(x)		(((x) & 0x3) << 30)
+#define TEGRA_USB_PORTSC1_PHCD			BIT(23)
 
 /* HOSTPC1 PTS/PHCD bits, Tegra30 and above */
-#define TEGRA_USB_HOSTPC1_DEVLC		0x1b4
-#define TEGRA_USB_HOSTPC1_DEVLC_PTS(x)	(((x) & 0x7) << 29)
-#define TEGRA_USB_HOSTPC1_DEVLC_PHCD	(1 << 22)
+#define TEGRA_USB_HOSTPC1_DEVLC			0x1b4
+#define TEGRA_USB_HOSTPC1_DEVLC_PTS(x)		(((x) & 0x7) << 29)
+#define TEGRA_USB_HOSTPC1_DEVLC_PHCD		BIT(22)
 
 /* Bits of PORTSC1, which will get cleared by writing 1 into them */
 #define TEGRA_PORTSC1_RWC_BITS	(PORT_CSC | PORT_PEC | PORT_OCC)
 
-#define USB_SUSP_CTRL		0x400
-#define   USB_WAKE_ON_CNNT_EN_DEV	(1 << 3)
-#define   USB_WAKE_ON_DISCON_EN_DEV	(1 << 4)
-#define   USB_SUSP_CLR		(1 << 5)
-#define   USB_PHY_CLK_VALID	(1 << 7)
-#define   UTMIP_RESET			(1 << 11)
-#define   UHSIC_RESET			(1 << 11)
-#define   UTMIP_PHY_ENABLE		(1 << 12)
-#define   ULPI_PHY_ENABLE	(1 << 13)
-#define   USB_SUSP_SET		(1 << 14)
-#define   USB_WAKEUP_DEBOUNCE_COUNT(x)	(((x) & 0x7) << 16)
-
-#define USB1_LEGACY_CTRL	0x410
-#define   USB1_NO_LEGACY_MODE			(1 << 0)
+#define USB_SUSP_CTRL				0x400
+#define   USB_WAKE_ON_CNNT_EN_DEV		BIT(3)
+#define   USB_WAKE_ON_DISCON_EN_DEV		BIT(4)
+#define   USB_SUSP_CLR				BIT(5)
+#define   USB_PHY_CLK_VALID			BIT(7)
+#define   UTMIP_RESET				BIT(11)
+#define   UHSIC_RESET				BIT(11)
+#define   UTMIP_PHY_ENABLE			BIT(12)
+#define   ULPI_PHY_ENABLE			BIT(13)
+#define   USB_SUSP_SET				BIT(14)
+#define   USB_WAKEUP_DEBOUNCE_COUNT(x)		(((x) & 0x7) << 16)
+
+#define USB1_LEGACY_CTRL			0x410
+#define   USB1_NO_LEGACY_MODE			BIT(0)
 #define   USB1_VBUS_SENSE_CTL_MASK		(3 << 1)
 #define   USB1_VBUS_SENSE_CTL_VBUS_WAKEUP	(0 << 1)
 #define   USB1_VBUS_SENSE_CTL_AB_SESS_VLD_OR_VBUS_WAKEUP \
@@ -64,88 +64,88 @@
 #define   USB1_VBUS_SENSE_CTL_AB_SESS_VLD	(2 << 1)
 #define   USB1_VBUS_SENSE_CTL_A_SESS_VLD	(3 << 1)
 
-#define ULPI_TIMING_CTRL_0	0x424
-#define   ULPI_OUTPUT_PINMUX_BYP	(1 << 10)
-#define   ULPI_CLKOUT_PINMUX_BYP	(1 << 11)
+#define ULPI_TIMING_CTRL_0			0x424
+#define   ULPI_OUTPUT_PINMUX_BYP		BIT(10)
+#define   ULPI_CLKOUT_PINMUX_BYP		BIT(11)
 
-#define ULPI_TIMING_CTRL_1	0x428
-#define   ULPI_DATA_TRIMMER_LOAD	(1 << 0)
-#define   ULPI_DATA_TRIMMER_SEL(x)	(((x) & 0x7) << 1)
-#define   ULPI_STPDIRNXT_TRIMMER_LOAD	(1 << 16)
-#define   ULPI_STPDIRNXT_TRIMMER_SEL(x)	(((x) & 0x7) << 17)
-#define   ULPI_DIR_TRIMMER_LOAD		(1 << 24)
-#define   ULPI_DIR_TRIMMER_SEL(x)	(((x) & 0x7) << 25)
+#define ULPI_TIMING_CTRL_1			0x428
+#define   ULPI_DATA_TRIMMER_LOAD		BIT(0)
+#define   ULPI_DATA_TRIMMER_SEL(x)		(((x) & 0x7) << 1)
+#define   ULPI_STPDIRNXT_TRIMMER_LOAD		BIT(16)
+#define   ULPI_STPDIRNXT_TRIMMER_SEL(x)		(((x) & 0x7) << 17)
+#define   ULPI_DIR_TRIMMER_LOAD			BIT(24)
+#define   ULPI_DIR_TRIMMER_SEL(x)		(((x) & 0x7) << 25)
 
-#define UTMIP_PLL_CFG1		0x804
+#define UTMIP_PLL_CFG1				0x804
 #define   UTMIP_XTAL_FREQ_COUNT(x)		(((x) & 0xfff) << 0)
 #define   UTMIP_PLLU_ENABLE_DLY_COUNT(x)	(((x) & 0x1f) << 27)
 
-#define UTMIP_XCVR_CFG0		0x808
+#define UTMIP_XCVR_CFG0				0x808
 #define   UTMIP_XCVR_SETUP(x)			(((x) & 0xf) << 0)
 #define   UTMIP_XCVR_SETUP_MSB(x)		((((x) & 0x70) >> 4) << 22)
 #define   UTMIP_XCVR_LSRSLEW(x)			(((x) & 0x3) << 8)
 #define   UTMIP_XCVR_LSFSLEW(x)			(((x) & 0x3) << 10)
-#define   UTMIP_FORCE_PD_POWERDOWN		(1 << 14)
-#define   UTMIP_FORCE_PD2_POWERDOWN		(1 << 16)
-#define   UTMIP_FORCE_PDZI_POWERDOWN		(1 << 18)
-#define   UTMIP_XCVR_LSBIAS_SEL			(1 << 21)
+#define   UTMIP_FORCE_PD_POWERDOWN		BIT(14)
+#define   UTMIP_FORCE_PD2_POWERDOWN		BIT(16)
+#define   UTMIP_FORCE_PDZI_POWERDOWN		BIT(18)
+#define   UTMIP_XCVR_LSBIAS_SEL			BIT(21)
 #define   UTMIP_XCVR_HSSLEW(x)			(((x) & 0x3) << 4)
 #define   UTMIP_XCVR_HSSLEW_MSB(x)		((((x) & 0x1fc) >> 2) << 25)
 
-#define UTMIP_BIAS_CFG0		0x80c
-#define   UTMIP_OTGPD			(1 << 11)
-#define   UTMIP_BIASPD			(1 << 10)
-#define   UTMIP_HSSQUELCH_LEVEL(x)	(((x) & 0x3) << 0)
-#define   UTMIP_HSDISCON_LEVEL(x)	(((x) & 0x3) << 2)
-#define   UTMIP_HSDISCON_LEVEL_MSB(x)	((((x) & 0x4) >> 2) << 24)
+#define UTMIP_BIAS_CFG0				0x80c
+#define   UTMIP_OTGPD				BIT(11)
+#define   UTMIP_BIASPD				BIT(10)
+#define   UTMIP_HSSQUELCH_LEVEL(x)		(((x) & 0x3) << 0)
+#define   UTMIP_HSDISCON_LEVEL(x)		(((x) & 0x3) << 2)
+#define   UTMIP_HSDISCON_LEVEL_MSB(x)		((((x) & 0x4) >> 2) << 24)
 
-#define UTMIP_HSRX_CFG0		0x810
-#define   UTMIP_ELASTIC_LIMIT(x)	(((x) & 0x1f) << 10)
-#define   UTMIP_IDLE_WAIT(x)		(((x) & 0x1f) << 15)
+#define UTMIP_HSRX_CFG0				0x810
+#define   UTMIP_ELASTIC_LIMIT(x)		(((x) & 0x1f) << 10)
+#define   UTMIP_IDLE_WAIT(x)			(((x) & 0x1f) << 15)
 
-#define UTMIP_HSRX_CFG1		0x814
-#define   UTMIP_HS_SYNC_START_DLY(x)	(((x) & 0x1f) << 1)
+#define UTMIP_HSRX_CFG1				0x814
+#define   UTMIP_HS_SYNC_START_DLY(x)		(((x) & 0x1f) << 1)
 
-#define UTMIP_TX_CFG0		0x820
-#define   UTMIP_FS_PREABMLE_J		(1 << 19)
-#define   UTMIP_HS_DISCON_DISABLE	(1 << 8)
+#define UTMIP_TX_CFG0				0x820
+#define   UTMIP_FS_PREABMLE_J			BIT(19)
+#define   UTMIP_HS_DISCON_DISABLE		BIT(8)
 
-#define UTMIP_MISC_CFG0		0x824
-#define   UTMIP_DPDM_OBSERVE		(1 << 26)
-#define   UTMIP_DPDM_OBSERVE_SEL(x)	(((x) & 0xf) << 27)
-#define   UTMIP_DPDM_OBSERVE_SEL_FS_J	UTMIP_DPDM_OBSERVE_SEL(0xf)
-#define   UTMIP_DPDM_OBSERVE_SEL_FS_K	UTMIP_DPDM_OBSERVE_SEL(0xe)
-#define   UTMIP_DPDM_OBSERVE_SEL_FS_SE1 UTMIP_DPDM_OBSERVE_SEL(0xd)
-#define   UTMIP_DPDM_OBSERVE_SEL_FS_SE0 UTMIP_DPDM_OBSERVE_SEL(0xc)
-#define   UTMIP_SUSPEND_EXIT_ON_EDGE	(1 << 22)
+#define UTMIP_MISC_CFG0				0x824
+#define   UTMIP_DPDM_OBSERVE			BIT(26)
+#define   UTMIP_DPDM_OBSERVE_SEL(x)		(((x) & 0xf) << 27)
+#define   UTMIP_DPDM_OBSERVE_SEL_FS_J		UTMIP_DPDM_OBSERVE_SEL(0xf)
+#define   UTMIP_DPDM_OBSERVE_SEL_FS_K		UTMIP_DPDM_OBSERVE_SEL(0xe)
+#define   UTMIP_DPDM_OBSERVE_SEL_FS_SE1		UTMIP_DPDM_OBSERVE_SEL(0xd)
+#define   UTMIP_DPDM_OBSERVE_SEL_FS_SE0		UTMIP_DPDM_OBSERVE_SEL(0xc)
+#define   UTMIP_SUSPEND_EXIT_ON_EDGE		BIT(22)
 
-#define UTMIP_MISC_CFG1		0x828
-#define   UTMIP_PLL_ACTIVE_DLY_COUNT(x)	(((x) & 0x1f) << 18)
-#define   UTMIP_PLLU_STABLE_COUNT(x)	(((x) & 0xfff) << 6)
+#define UTMIP_MISC_CFG1				0x828
+#define   UTMIP_PLL_ACTIVE_DLY_COUNT(x)		(((x) & 0x1f) << 18)
+#define   UTMIP_PLLU_STABLE_COUNT(x)		(((x) & 0xfff) << 6)
 
-#define UTMIP_DEBOUNCE_CFG0	0x82c
-#define   UTMIP_BIAS_DEBOUNCE_A(x)	(((x) & 0xffff) << 0)
+#define UTMIP_DEBOUNCE_CFG0			0x82c
+#define   UTMIP_BIAS_DEBOUNCE_A(x)		(((x) & 0xffff) << 0)
 
-#define UTMIP_BAT_CHRG_CFG0	0x830
-#define   UTMIP_PD_CHRG			(1 << 0)
+#define UTMIP_BAT_CHRG_CFG0			0x830
+#define   UTMIP_PD_CHRG				BIT(0)
 
-#define UTMIP_SPARE_CFG0	0x834
-#define   FUSE_SETUP_SEL		(1 << 3)
+#define UTMIP_SPARE_CFG0			0x834
+#define   FUSE_SETUP_SEL			BIT(3)
 
-#define UTMIP_XCVR_CFG1		0x838
-#define   UTMIP_FORCE_PDDISC_POWERDOWN	(1 << 0)
-#define   UTMIP_FORCE_PDCHRP_POWERDOWN	(1 << 2)
-#define   UTMIP_FORCE_PDDR_POWERDOWN	(1 << 4)
-#define   UTMIP_XCVR_TERM_RANGE_ADJ(x)	(((x) & 0xf) << 18)
+#define UTMIP_XCVR_CFG1				0x838
+#define   UTMIP_FORCE_PDDISC_POWERDOWN		BIT(0)
+#define   UTMIP_FORCE_PDCHRP_POWERDOWN		BIT(2)
+#define   UTMIP_FORCE_PDDR_POWERDOWN		BIT(4)
+#define   UTMIP_XCVR_TERM_RANGE_ADJ(x)		(((x) & 0xf) << 18)
 
-#define UTMIP_BIAS_CFG1		0x83c
-#define   UTMIP_BIAS_PDTRK_COUNT(x)	(((x) & 0x1f) << 3)
+#define UTMIP_BIAS_CFG1				0x83c
+#define   UTMIP_BIAS_PDTRK_COUNT(x)		(((x) & 0x1f) << 3)
 
 /* For Tegra30 and above only, the address is different in Tegra20 */
-#define USB_USBMODE		0x1f8
-#define   USB_USBMODE_MASK		(3 << 0)
-#define   USB_USBMODE_HOST		(3 << 0)
-#define   USB_USBMODE_DEVICE		(2 << 0)
+#define USB_USBMODE				0x1f8
+#define   USB_USBMODE_MASK			(3 << 0)
+#define   USB_USBMODE_HOST			(3 << 0)
+#define   USB_USBMODE_DEVICE			(2 << 0)
 
 static DEFINE_SPINLOCK(utmip_pad_lock);
 static int utmip_pad_count;
@@ -194,6 +194,11 @@ static const struct tegra_xtal_freq tegra_freq_table[] = {
 	},
 };
 
+static inline struct tegra_usb_phy *to_tegra_usb_phy(struct usb_phy *u_phy)
+{
+	return container_of(u_phy, struct tegra_usb_phy, u_phy);
+}
+
 static void set_pts(struct tegra_usb_phy *phy, u8 pts_val)
 {
 	void __iomem *base = phy->regs;
@@ -303,20 +308,23 @@ static void ulpi_close(struct tegra_usb_phy *phy)
 	int err;
 
 	err = gpio_direction_output(phy->reset_gpio, 1);
-	if (err < 0) {
+	if (err) {
 		dev_err(phy->u_phy.dev,
 			"ULPI reset GPIO %d direction not asserted: %d\n",
 			phy->reset_gpio, err);
 	}
 }
 
-static void utmip_pad_power_on(struct tegra_usb_phy *phy)
+static int utmip_pad_power_on(struct tegra_usb_phy *phy)
 {
-	unsigned long val, flags;
-	void __iomem *base = phy->pad_regs;
 	struct tegra_utmip_config *config = phy->config;
+	void __iomem *base = phy->pad_regs;
+	unsigned long val, flags;
+	int err;
 
-	clk_prepare_enable(phy->pad_clk);
+	err = clk_prepare_enable(phy->pad_clk);
+	if (err)
+		return err;
 
 	spin_lock_irqsave(&utmip_pad_lock, flags);
 
@@ -339,19 +347,24 @@ static void utmip_pad_power_on(struct tegra_usb_phy *phy)
 	spin_unlock_irqrestore(&utmip_pad_lock, flags);
 
 	clk_disable_unprepare(phy->pad_clk);
+
+	return 0;
 }
 
 static int utmip_pad_power_off(struct tegra_usb_phy *phy)
 {
-	unsigned long val, flags;
 	void __iomem *base = phy->pad_regs;
+	unsigned long val, flags;
+	int err;
 
 	if (!utmip_pad_count) {
 		dev_err(phy->u_phy.dev, "UTMIP pad already powered off\n");
 		return -EINVAL;
 	}
 
-	clk_prepare_enable(phy->pad_clk);
+	err = clk_prepare_enable(phy->pad_clk);
+	if (err)
+		return err;
 
 	spin_lock_irqsave(&utmip_pad_lock, flags);
 
@@ -378,8 +391,8 @@ static int utmi_wait_register(void __iomem *reg, u32 mask, u32 result)
 
 static void utmi_phy_clk_disable(struct tegra_usb_phy *phy)
 {
-	unsigned long val;
 	void __iomem *base = phy->regs;
+	unsigned long val;
 
 	/*
 	 * The USB driver may have already initiated the phy clock
@@ -394,23 +407,24 @@ static void utmi_phy_clk_disable(struct tegra_usb_phy *phy)
 		val |= USB_SUSP_SET;
 		writel(val, base + USB_SUSP_CTRL);
 
-		udelay(10);
+		usleep_range(10, 100);
 
 		val = readl(base + USB_SUSP_CTRL);
 		val &= ~USB_SUSP_SET;
 		writel(val, base + USB_SUSP_CTRL);
-	} else
+	} else {
 		set_phcd(phy, true);
+	}
 
-	if (utmi_wait_register(base + USB_SUSP_CTRL, USB_PHY_CLK_VALID, 0) < 0)
+	if (utmi_wait_register(base + USB_SUSP_CTRL, USB_PHY_CLK_VALID, 0))
 		dev_err(phy->u_phy.dev,
 			"Timeout waiting for PHY to stabilize on disable\n");
 }
 
 static void utmi_phy_clk_enable(struct tegra_usb_phy *phy)
 {
-	unsigned long val;
 	void __iomem *base = phy->regs;
+	unsigned long val;
 
 	/*
 	 * The USB driver may have already initiated the phy clock
@@ -426,25 +440,27 @@ static void utmi_phy_clk_enable(struct tegra_usb_phy *phy)
 		val |= USB_SUSP_CLR;
 		writel(val, base + USB_SUSP_CTRL);
 
-		udelay(10);
+		usleep_range(10, 100);
 
 		val = readl(base + USB_SUSP_CTRL);
 		val &= ~USB_SUSP_CLR;
 		writel(val, base + USB_SUSP_CTRL);
-	} else
+	} else {
 		set_phcd(phy, false);
+	}
 
 	if (utmi_wait_register(base + USB_SUSP_CTRL, USB_PHY_CLK_VALID,
-						     USB_PHY_CLK_VALID))
+			       USB_PHY_CLK_VALID))
 		dev_err(phy->u_phy.dev,
 			"Timeout waiting for PHY to stabilize on enable\n");
 }
 
 static int utmi_phy_power_on(struct tegra_usb_phy *phy)
 {
-	unsigned long val;
-	void __iomem *base = phy->regs;
 	struct tegra_utmip_config *config = phy->config;
+	void __iomem *base = phy->regs;
+	unsigned long val;
+	int err;
 
 	val = readl(base + USB_SUSP_CTRL);
 	val |= UTMIP_RESET;
@@ -510,7 +526,9 @@ static int utmi_phy_power_on(struct tegra_usb_phy *phy)
 		writel(val, base + UTMIP_BAT_CHRG_CFG0);
 	}
 
-	utmip_pad_power_on(phy);
+	err = utmip_pad_power_on(phy);
+	if (err)
+		return err;
 
 	val = readl(base + UTMIP_XCVR_CFG0);
 	val &= ~(UTMIP_FORCE_PD_POWERDOWN | UTMIP_FORCE_PD2_POWERDOWN |
@@ -591,8 +609,8 @@ static int utmi_phy_power_on(struct tegra_usb_phy *phy)
 
 static int utmi_phy_power_off(struct tegra_usb_phy *phy)
 {
-	unsigned long val;
 	void __iomem *base = phy->regs;
+	unsigned long val;
 
 	utmi_phy_clk_disable(phy);
 
@@ -626,8 +644,8 @@ static int utmi_phy_power_off(struct tegra_usb_phy *phy)
 
 static void utmi_phy_preresume(struct tegra_usb_phy *phy)
 {
-	unsigned long val;
 	void __iomem *base = phy->regs;
+	unsigned long val;
 
 	val = readl(base + UTMIP_TX_CFG0);
 	val |= UTMIP_HS_DISCON_DISABLE;
@@ -636,8 +654,8 @@ static void utmi_phy_preresume(struct tegra_usb_phy *phy)
 
 static void utmi_phy_postresume(struct tegra_usb_phy *phy)
 {
-	unsigned long val;
 	void __iomem *base = phy->regs;
+	unsigned long val;
 
 	val = readl(base + UTMIP_TX_CFG0);
 	val &= ~UTMIP_HS_DISCON_DISABLE;
@@ -647,8 +665,8 @@ static void utmi_phy_postresume(struct tegra_usb_phy *phy)
 static void utmi_phy_restore_start(struct tegra_usb_phy *phy,
 				   enum tegra_usb_phy_port_speed port_speed)
 {
-	unsigned long val;
 	void __iomem *base = phy->regs;
+	unsigned long val;
 
 	val = readl(base + UTMIP_MISC_CFG0);
 	val &= ~UTMIP_DPDM_OBSERVE_SEL(~0);
@@ -657,47 +675,52 @@ static void utmi_phy_restore_start(struct tegra_usb_phy *phy,
 	else
 		val |= UTMIP_DPDM_OBSERVE_SEL_FS_J;
 	writel(val, base + UTMIP_MISC_CFG0);
-	udelay(1);
+	usleep_range(1, 10);
 
 	val = readl(base + UTMIP_MISC_CFG0);
 	val |= UTMIP_DPDM_OBSERVE;
 	writel(val, base + UTMIP_MISC_CFG0);
-	udelay(10);
+	usleep_range(10, 100);
 }
 
 static void utmi_phy_restore_end(struct tegra_usb_phy *phy)
 {
-	unsigned long val;
 	void __iomem *base = phy->regs;
+	unsigned long val;
 
 	val = readl(base + UTMIP_MISC_CFG0);
 	val &= ~UTMIP_DPDM_OBSERVE;
 	writel(val, base + UTMIP_MISC_CFG0);
-	udelay(10);
+	usleep_range(10, 100);
 }
 
 static int ulpi_phy_power_on(struct tegra_usb_phy *phy)
 {
-	int ret;
-	unsigned long val;
 	void __iomem *base = phy->regs;
+	unsigned long val;
+	int err;
 
-	ret = gpio_direction_output(phy->reset_gpio, 0);
-	if (ret < 0) {
+	err = gpio_direction_output(phy->reset_gpio, 0);
+	if (err) {
 		dev_err(phy->u_phy.dev, "GPIO %d not set to 0: %d\n",
-			phy->reset_gpio, ret);
-		return ret;
+			phy->reset_gpio, err);
+		return err;
 	}
-	msleep(5);
-	ret = gpio_direction_output(phy->reset_gpio, 1);
-	if (ret < 0) {
+
+	err = clk_prepare_enable(phy->clk);
+	if (err)
+		return err;
+
+	usleep_range(5000, 10000);
+
+	err = gpio_direction_output(phy->reset_gpio, 1);
+	if (err) {
 		dev_err(phy->u_phy.dev, "GPIO %d not set to 1: %d\n",
-			phy->reset_gpio, ret);
-		return ret;
+			phy->reset_gpio, err);
+		goto disable_clk;
 	}
 
-	clk_prepare_enable(phy->clk);
-	msleep(1);
+	usleep_range(1000, 2000);
 
 	val = readl(base + USB_SUSP_CTRL);
 	val |= UHSIC_RESET;
@@ -718,7 +741,7 @@ static int ulpi_phy_power_on(struct tegra_usb_phy *phy)
 	val |= ULPI_STPDIRNXT_TRIMMER_SEL(4);
 	val |= ULPI_DIR_TRIMMER_SEL(4);
 	writel(val, base + ULPI_TIMING_CTRL_1);
-	udelay(10);
+	usleep_range(10, 100);
 
 	val |= ULPI_DATA_TRIMMER_LOAD;
 	val |= ULPI_STPDIRNXT_TRIMMER_LOAD;
@@ -726,40 +749,45 @@ static int ulpi_phy_power_on(struct tegra_usb_phy *phy)
 	writel(val, base + ULPI_TIMING_CTRL_1);
 
 	/* Fix VbusInvalid due to floating VBUS */
-	ret = usb_phy_io_write(phy->ulpi, 0x40, 0x08);
-	if (ret) {
-		dev_err(phy->u_phy.dev, "ULPI write failed: %d\n", ret);
-		return ret;
+	err = usb_phy_io_write(phy->ulpi, 0x40, 0x08);
+	if (err) {
+		dev_err(phy->u_phy.dev, "ULPI write failed: %d\n", err);
+		goto disable_clk;
 	}
 
-	ret = usb_phy_io_write(phy->ulpi, 0x80, 0x0B);
-	if (ret) {
-		dev_err(phy->u_phy.dev, "ULPI write failed: %d\n", ret);
-		return ret;
+	err = usb_phy_io_write(phy->ulpi, 0x80, 0x0B);
+	if (err) {
+		dev_err(phy->u_phy.dev, "ULPI write failed: %d\n", err);
+		goto disable_clk;
 	}
 
 	val = readl(base + USB_SUSP_CTRL);
 	val |= USB_SUSP_CLR;
 	writel(val, base + USB_SUSP_CTRL);
-	udelay(100);
+	usleep_range(100, 1000);
 
 	val = readl(base + USB_SUSP_CTRL);
 	val &= ~USB_SUSP_CLR;
 	writel(val, base + USB_SUSP_CTRL);
 
 	return 0;
+
+disable_clk:
+	clk_disable_unprepare(phy->clk);
+
+	return err;
 }
 
 static int ulpi_phy_power_off(struct tegra_usb_phy *phy)
 {
-	clk_disable(phy->clk);
+	clk_disable_unprepare(phy->clk);
+
 	return gpio_direction_output(phy->reset_gpio, 0);
 }
 
 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);
+	struct tegra_usb_phy *phy = to_tegra_usb_phy(u_phy);
 
 	if (WARN_ON(!phy->freq))
 		return;
@@ -793,9 +821,9 @@ static int tegra_usb_phy_power_off(struct tegra_usb_phy *phy)
 		return utmi_phy_power_off(phy);
 }
 
-static int tegra_usb_phy_set_suspend(struct usb_phy *x, int suspend)
+static int tegra_usb_phy_set_suspend(struct usb_phy *u_phy, int suspend)
 {
-	struct tegra_usb_phy *phy = container_of(x, struct tegra_usb_phy, u_phy);
+	struct tegra_usb_phy *phy = to_tegra_usb_phy(u_phy);
 
 	if (WARN_ON(!phy->freq))
 		return -EINVAL;
@@ -811,7 +839,7 @@ static int ulpi_open(struct tegra_usb_phy *phy)
 	int err;
 
 	err = gpio_direction_output(phy->reset_gpio, 0);
-	if (err < 0) {
+	if (err) {
 		dev_err(phy->u_phy.dev,
 			"ULPI reset GPIO %d direction not deasserted: %d\n",
 			phy->reset_gpio, err);
@@ -823,10 +851,9 @@ static int ulpi_open(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);
+	struct tegra_usb_phy *phy = to_tegra_usb_phy(u_phy);
 	unsigned long parent_rate;
-	int i;
+	unsigned int i;
 	int err;
 
 	if (WARN_ON(phy->freq))
@@ -864,7 +891,7 @@ static int tegra_usb_phy_init(struct usb_phy *u_phy)
 		err = ulpi_open(phy);
 	else
 		err = utmip_pad_open(phy);
-	if (err < 0)
+	if (err)
 		goto fail;
 
 	err = tegra_usb_phy_power_on(phy);
@@ -886,37 +913,37 @@ static int tegra_usb_phy_init(struct usb_phy *u_phy)
 	return err;
 }
 
-void tegra_usb_phy_preresume(struct usb_phy *x)
+void tegra_usb_phy_preresume(struct usb_phy *u_phy)
 {
-	struct tegra_usb_phy *phy = container_of(x, struct tegra_usb_phy, u_phy);
+	struct tegra_usb_phy *phy = to_tegra_usb_phy(u_phy);
 
 	if (!phy->is_ulpi_phy)
 		utmi_phy_preresume(phy);
 }
 EXPORT_SYMBOL_GPL(tegra_usb_phy_preresume);
 
-void tegra_usb_phy_postresume(struct usb_phy *x)
+void tegra_usb_phy_postresume(struct usb_phy *u_phy)
 {
-	struct tegra_usb_phy *phy = container_of(x, struct tegra_usb_phy, u_phy);
+	struct tegra_usb_phy *phy = to_tegra_usb_phy(u_phy);
 
 	if (!phy->is_ulpi_phy)
 		utmi_phy_postresume(phy);
 }
 EXPORT_SYMBOL_GPL(tegra_usb_phy_postresume);
 
-void tegra_ehci_phy_restore_start(struct usb_phy *x,
-				 enum tegra_usb_phy_port_speed port_speed)
+void tegra_ehci_phy_restore_start(struct usb_phy *u_phy,
+				  enum tegra_usb_phy_port_speed port_speed)
 {
-	struct tegra_usb_phy *phy = container_of(x, struct tegra_usb_phy, u_phy);
+	struct tegra_usb_phy *phy = to_tegra_usb_phy(u_phy);
 
 	if (!phy->is_ulpi_phy)
 		utmi_phy_restore_start(phy, port_speed);
 }
 EXPORT_SYMBOL_GPL(tegra_ehci_phy_restore_start);
 
-void tegra_ehci_phy_restore_end(struct usb_phy *x)
+void tegra_ehci_phy_restore_end(struct usb_phy *u_phy)
 {
-	struct tegra_usb_phy *phy = container_of(x, struct tegra_usb_phy, u_phy);
+	struct tegra_usb_phy *phy = to_tegra_usb_phy(u_phy);
 
 	if (!phy->is_ulpi_phy)
 		utmi_phy_restore_end(phy);
@@ -927,21 +954,25 @@ static int read_utmi_param(struct platform_device *pdev, const char *param,
 			   u8 *dest)
 {
 	u32 value;
-	int err = of_property_read_u32(pdev->dev.of_node, param, &value);
-	*dest = (u8)value;
-	if (err < 0)
+	int err;
+
+	err = of_property_read_u32(pdev->dev.of_node, param, &value);
+	if (err)
 		dev_err(&pdev->dev,
 			"Failed to read USB UTMI parameter %s: %d\n",
 			param, err);
+	else
+		*dest = value;
+
 	return err;
 }
 
 static int utmi_phy_probe(struct tegra_usb_phy *tegra_phy,
 			  struct platform_device *pdev)
 {
+	struct tegra_utmip_config *config;
 	struct resource *res;
 	int err;
-	struct tegra_utmip_config *config;
 
 	tegra_phy->is_ulpi_phy = false;
 
@@ -952,7 +983,7 @@ static int utmi_phy_probe(struct tegra_usb_phy *tegra_phy,
 	}
 
 	tegra_phy->pad_regs = devm_ioremap(&pdev->dev, res->start,
-		resource_size(res));
+					   resource_size(res));
 	if (!tegra_phy->pad_regs) {
 		dev_err(&pdev->dev, "Failed to remap UTMI pad regs\n");
 		return -ENOMEM;
@@ -966,49 +997,49 @@ static int utmi_phy_probe(struct tegra_usb_phy *tegra_phy,
 	config = tegra_phy->config;
 
 	err = read_utmi_param(pdev, "nvidia,hssync-start-delay",
-		&config->hssync_start_delay);
-	if (err < 0)
+			      &config->hssync_start_delay);
+	if (err)
 		return err;
 
 	err = read_utmi_param(pdev, "nvidia,elastic-limit",
-		&config->elastic_limit);
-	if (err < 0)
+			      &config->elastic_limit);
+	if (err)
 		return err;
 
 	err = read_utmi_param(pdev, "nvidia,idle-wait-delay",
-		&config->idle_wait_delay);
-	if (err < 0)
+			      &config->idle_wait_delay);
+	if (err)
 		return err;
 
 	err = read_utmi_param(pdev, "nvidia,term-range-adj",
-		&config->term_range_adj);
-	if (err < 0)
+			      &config->term_range_adj);
+	if (err)
 		return err;
 
 	err = read_utmi_param(pdev, "nvidia,xcvr-lsfslew",
-		&config->xcvr_lsfslew);
-	if (err < 0)
+			      &config->xcvr_lsfslew);
+	if (err)
 		return err;
 
 	err = read_utmi_param(pdev, "nvidia,xcvr-lsrslew",
-		&config->xcvr_lsrslew);
-	if (err < 0)
+			      &config->xcvr_lsrslew);
+	if (err)
 		return err;
 
 	if (tegra_phy->soc_config->requires_extra_tuning_parameters) {
 		err = read_utmi_param(pdev, "nvidia,xcvr-hsslew",
-			&config->xcvr_hsslew);
-		if (err < 0)
+				      &config->xcvr_hsslew);
+		if (err)
 			return err;
 
 		err = read_utmi_param(pdev, "nvidia,hssquelch-level",
-			&config->hssquelch_level);
-		if (err < 0)
+				      &config->hssquelch_level);
+		if (err)
 			return err;
 
 		err = read_utmi_param(pdev, "nvidia,hsdiscon-level",
-			&config->hsdiscon_level);
-		if (err < 0)
+				      &config->hsdiscon_level);
+		if (err)
 			return err;
 	}
 
@@ -1017,8 +1048,8 @@ static int utmi_phy_probe(struct tegra_usb_phy *tegra_phy,
 
 	if (!config->xcvr_setup_use_fuses) {
 		err = read_utmi_param(pdev, "nvidia,xcvr-setup",
-			&config->xcvr_setup);
-		if (err < 0)
+				      &config->xcvr_setup);
+		if (err)
 			return err;
 	}
 
@@ -1048,23 +1079,18 @@ MODULE_DEVICE_TABLE(of, tegra_usb_phy_id_table);
 
 static int tegra_usb_phy_probe(struct platform_device *pdev)
 {
-	const struct of_device_id *match;
-	struct resource *res;
-	struct tegra_usb_phy *tegra_phy = NULL;
 	struct device_node *np = pdev->dev.of_node;
+	struct tegra_usb_phy *tegra_phy;
 	enum usb_phy_interface phy_type;
+	struct reset_control *reset;
+	struct resource *res;
 	int err;
 
 	tegra_phy = devm_kzalloc(&pdev->dev, sizeof(*tegra_phy), GFP_KERNEL);
 	if (!tegra_phy)
 		return -ENOMEM;
 
-	match = of_match_device(tegra_usb_phy_id_table, &pdev->dev);
-	if (!match) {
-		dev_err(&pdev->dev, "Error: No device match found\n");
-		return -ENODEV;
-	}
-	tegra_phy->soc_config = match->data;
+	tegra_phy->soc_config = of_device_get_match_data(&pdev->dev);
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
@@ -1073,7 +1099,7 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
 	}
 
 	tegra_phy->regs = devm_ioremap(&pdev->dev, res->start,
-		resource_size(res));
+				       resource_size(res));
 	if (!tegra_phy->regs) {
 		dev_err(&pdev->dev, "Failed to remap I/O memory\n");
 		return -ENOMEM;
@@ -1082,33 +1108,6 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
 	tegra_phy->is_legacy_phy =
 		of_property_read_bool(np, "nvidia,has-legacy-mode");
 
-	phy_type = of_usb_get_phy_mode(np);
-	switch (phy_type) {
-	case USBPHY_INTERFACE_MODE_UTMI:
-		err = utmi_phy_probe(tegra_phy, pdev);
-		if (err < 0)
-			return err;
-		break;
-
-	case USBPHY_INTERFACE_MODE_ULPI:
-		tegra_phy->is_ulpi_phy = true;
-
-		tegra_phy->reset_gpio =
-			of_get_named_gpio(np, "nvidia,phy-reset-gpio", 0);
-		if (!gpio_is_valid(tegra_phy->reset_gpio)) {
-			dev_err(&pdev->dev,
-				"Invalid GPIO: %d\n", tegra_phy->reset_gpio);
-			return tegra_phy->reset_gpio;
-		}
-		tegra_phy->config = NULL;
-		break;
-
-	default:
-		dev_err(&pdev->dev, "phy_type %u is invalid or unsupported\n",
-			phy_type);
-		return -EINVAL;
-	}
-
 	if (of_find_property(np, "dr_mode", NULL))
 		tegra_phy->mode = usb_get_dr_mode(&pdev->dev);
 	else
@@ -1136,7 +1135,44 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
 		return err;
 	}
 
-	if (tegra_phy->is_ulpi_phy) {
+	phy_type = of_usb_get_phy_mode(np);
+	switch (phy_type) {
+	case USBPHY_INTERFACE_MODE_UTMI:
+		err = utmi_phy_probe(tegra_phy, pdev);
+		if (err)
+			return err;
+
+		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;
+		}
+
+		reset = devm_reset_control_get_optional_shared(&pdev->dev,
+							       "utmi-pads");
+		err = PTR_ERR_OR_ZERO(reset);
+		if (err) {
+			dev_err(&pdev->dev,
+				"Failed to get UTMI-pads reset: %d\n", err);
+			return err;
+		}
+		tegra_phy->pad_rst = reset;
+		break;
+
+	case USBPHY_INTERFACE_MODE_ULPI:
+		tegra_phy->is_ulpi_phy = true;
+
+		tegra_phy->reset_gpio =
+			of_get_named_gpio(np, "nvidia,phy-reset-gpio", 0);
+
+		if (!gpio_is_valid(tegra_phy->reset_gpio)) {
+			dev_err(&pdev->dev,
+				"Invalid GPIO: %d\n", tegra_phy->reset_gpio);
+			return tegra_phy->reset_gpio;
+		}
+
 		tegra_phy->clk = devm_clk_get(&pdev->dev, "ulpi-link");
 		err = PTR_ERR_OR_ZERO(tegra_phy->clk);
 		if (err) {
@@ -1146,8 +1182,8 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
 		}
 
 		err = devm_gpio_request(&pdev->dev, tegra_phy->reset_gpio,
-			"ulpi_phy_reset_b");
-		if (err < 0) {
+					"ulpi_phy_reset_b");
+		if (err) {
 			dev_err(&pdev->dev, "Request failed for GPIO %d: %d\n",
 				tegra_phy->reset_gpio, err);
 			return err;
@@ -1156,28 +1192,16 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
 		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;
+			return -ENOMEM;
 		}
 
 		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;
-		}
+		break;
 
-		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;
-		}
+	default:
+		dev_err(&pdev->dev, "phy_type %u is invalid or unsupported\n",
+			phy_type);
+		return -EINVAL;
 	}
 
 	tegra_phy->u_phy.dev = &pdev->dev;
@@ -1188,7 +1212,7 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, tegra_phy);
 
 	err = usb_add_phy_dev(&tegra_phy->u_phy);
-	if (err < 0)
+	if (err)
 		goto free_ulpi;
 
 	return 0;
-- 
2.24.0

[PATCH v3 04/16] usb: phy: tegra: Use relaxed versions of readl/writel

[Dmitry Osipenko]

There is nothing to synchronize in regards to memory stores, thus all
readl/writel occurrences in the code could be replaced with a relaxed
versions, for consistency.

Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/usb/phy/phy-tegra-usb.c | 195 ++++++++++++++++----------------
 1 file changed, 98 insertions(+), 97 deletions(-)

diff --git a/drivers/usb/phy/phy-tegra-usb.c b/drivers/usb/phy/phy-tegra-usb.c
index 227757b8174c..4d6d586c49cc 100644
--- a/drivers/usb/phy/phy-tegra-usb.c
+++ b/drivers/usb/phy/phy-tegra-usb.c
@@ -205,15 +205,16 @@ static void set_pts(struct tegra_usb_phy *phy, u8 pts_val)
 	unsigned long val;
 
 	if (phy->soc_config->has_hostpc) {
-		val = readl(base + TEGRA_USB_HOSTPC1_DEVLC);
+		val = readl_relaxed(base + TEGRA_USB_HOSTPC1_DEVLC);
 		val &= ~TEGRA_USB_HOSTPC1_DEVLC_PTS(~0);
 		val |= TEGRA_USB_HOSTPC1_DEVLC_PTS(pts_val);
-		writel(val, base + TEGRA_USB_HOSTPC1_DEVLC);
+		writel_relaxed(val, base + TEGRA_USB_HOSTPC1_DEVLC);
 	} else {
-		val = readl(base + TEGRA_USB_PORTSC1) & ~TEGRA_PORTSC1_RWC_BITS;
+		val = readl_relaxed(base + TEGRA_USB_PORTSC1);
+		val &= ~TEGRA_PORTSC1_RWC_BITS;
 		val &= ~TEGRA_USB_PORTSC1_PTS(~0);
 		val |= TEGRA_USB_PORTSC1_PTS(pts_val);
-		writel(val, base + TEGRA_USB_PORTSC1);
+		writel_relaxed(val, base + TEGRA_USB_PORTSC1);
 	}
 }
 
@@ -223,19 +224,19 @@ static void set_phcd(struct tegra_usb_phy *phy, bool enable)
 	unsigned long val;
 
 	if (phy->soc_config->has_hostpc) {
-		val = readl(base + TEGRA_USB_HOSTPC1_DEVLC);
+		val = readl_relaxed(base + TEGRA_USB_HOSTPC1_DEVLC);
 		if (enable)
 			val |= TEGRA_USB_HOSTPC1_DEVLC_PHCD;
 		else
 			val &= ~TEGRA_USB_HOSTPC1_DEVLC_PHCD;
-		writel(val, base + TEGRA_USB_HOSTPC1_DEVLC);
+		writel_relaxed(val, base + TEGRA_USB_HOSTPC1_DEVLC);
 	} else {
-		val = readl(base + TEGRA_USB_PORTSC1) & ~PORT_RWC_BITS;
+		val = readl_relaxed(base + TEGRA_USB_PORTSC1) & ~PORT_RWC_BITS;
 		if (enable)
 			val |= TEGRA_USB_PORTSC1_PHCD;
 		else
 			val &= ~TEGRA_USB_PORTSC1_PHCD;
-		writel(val, base + TEGRA_USB_PORTSC1);
+		writel_relaxed(val, base + TEGRA_USB_PORTSC1);
 	}
 }
 
@@ -329,7 +330,7 @@ static int utmip_pad_power_on(struct tegra_usb_phy *phy)
 	spin_lock_irqsave(&utmip_pad_lock, flags);
 
 	if (utmip_pad_count++ == 0) {
-		val = readl(base + UTMIP_BIAS_CFG0);
+		val = readl_relaxed(base + UTMIP_BIAS_CFG0);
 		val &= ~(UTMIP_OTGPD | UTMIP_BIASPD);
 
 		if (phy->soc_config->requires_extra_tuning_parameters) {
@@ -341,7 +342,7 @@ static int utmip_pad_power_on(struct tegra_usb_phy *phy)
 			val |= UTMIP_HSDISCON_LEVEL(config->hsdiscon_level);
 			val |= UTMIP_HSDISCON_LEVEL_MSB(config->hsdiscon_level);
 		}
-		writel(val, base + UTMIP_BIAS_CFG0);
+		writel_relaxed(val, base + UTMIP_BIAS_CFG0);
 	}
 
 	spin_unlock_irqrestore(&utmip_pad_lock, flags);
@@ -369,9 +370,9 @@ static int utmip_pad_power_off(struct tegra_usb_phy *phy)
 	spin_lock_irqsave(&utmip_pad_lock, flags);
 
 	if (--utmip_pad_count == 0) {
-		val = readl(base + UTMIP_BIAS_CFG0);
+		val = readl_relaxed(base + UTMIP_BIAS_CFG0);
 		val |= UTMIP_OTGPD | UTMIP_BIASPD;
-		writel(val, base + UTMIP_BIAS_CFG0);
+		writel_relaxed(val, base + UTMIP_BIAS_CFG0);
 	}
 
 	spin_unlock_irqrestore(&utmip_pad_lock, flags);
@@ -385,8 +386,8 @@ static int utmi_wait_register(void __iomem *reg, u32 mask, u32 result)
 {
 	u32 tmp;
 
-	return readl_poll_timeout(reg, tmp, (tmp & mask) == result,
-				  2000, 6000);
+	return readl_relaxed_poll_timeout(reg, tmp, (tmp & mask) == result,
+					  2000, 6000);
 }
 
 static void utmi_phy_clk_disable(struct tegra_usb_phy *phy)
@@ -403,15 +404,15 @@ static void utmi_phy_clk_disable(struct tegra_usb_phy *phy)
 		return;
 
 	if (phy->is_legacy_phy) {
-		val = readl(base + USB_SUSP_CTRL);
+		val = readl_relaxed(base + USB_SUSP_CTRL);
 		val |= USB_SUSP_SET;
-		writel(val, base + USB_SUSP_CTRL);
+		writel_relaxed(val, base + USB_SUSP_CTRL);
 
 		usleep_range(10, 100);
 
-		val = readl(base + USB_SUSP_CTRL);
+		val = readl_relaxed(base + USB_SUSP_CTRL);
 		val &= ~USB_SUSP_SET;
-		writel(val, base + USB_SUSP_CTRL);
+		writel_relaxed(val, base + USB_SUSP_CTRL);
 	} else {
 		set_phcd(phy, true);
 	}
@@ -436,15 +437,15 @@ static void utmi_phy_clk_enable(struct tegra_usb_phy *phy)
 		return;
 
 	if (phy->is_legacy_phy) {
-		val = readl(base + USB_SUSP_CTRL);
+		val = readl_relaxed(base + USB_SUSP_CTRL);
 		val |= USB_SUSP_CLR;
-		writel(val, base + USB_SUSP_CTRL);
+		writel_relaxed(val, base + USB_SUSP_CTRL);
 
 		usleep_range(10, 100);
 
-		val = readl(base + USB_SUSP_CTRL);
+		val = readl_relaxed(base + USB_SUSP_CTRL);
 		val &= ~USB_SUSP_CLR;
-		writel(val, base + USB_SUSP_CTRL);
+		writel_relaxed(val, base + USB_SUSP_CTRL);
 	} else {
 		set_phcd(phy, false);
 	}
@@ -462,75 +463,75 @@ static int utmi_phy_power_on(struct tegra_usb_phy *phy)
 	unsigned long val;
 	int err;
 
-	val = readl(base + USB_SUSP_CTRL);
+	val = readl_relaxed(base + USB_SUSP_CTRL);
 	val |= UTMIP_RESET;
-	writel(val, base + USB_SUSP_CTRL);
+	writel_relaxed(val, base + USB_SUSP_CTRL);
 
 	if (phy->is_legacy_phy) {
-		val = readl(base + USB1_LEGACY_CTRL);
+		val = readl_relaxed(base + USB1_LEGACY_CTRL);
 		val |= USB1_NO_LEGACY_MODE;
-		writel(val, base + USB1_LEGACY_CTRL);
+		writel_relaxed(val, base + USB1_LEGACY_CTRL);
 	}
 
-	val = readl(base + UTMIP_TX_CFG0);
+	val = readl_relaxed(base + UTMIP_TX_CFG0);
 	val |= UTMIP_FS_PREABMLE_J;
-	writel(val, base + UTMIP_TX_CFG0);
+	writel_relaxed(val, base + UTMIP_TX_CFG0);
 
-	val = readl(base + UTMIP_HSRX_CFG0);
+	val = readl_relaxed(base + UTMIP_HSRX_CFG0);
 	val &= ~(UTMIP_IDLE_WAIT(~0) | UTMIP_ELASTIC_LIMIT(~0));
 	val |= UTMIP_IDLE_WAIT(config->idle_wait_delay);
 	val |= UTMIP_ELASTIC_LIMIT(config->elastic_limit);
-	writel(val, base + UTMIP_HSRX_CFG0);
+	writel_relaxed(val, base + UTMIP_HSRX_CFG0);
 
-	val = readl(base + UTMIP_HSRX_CFG1);
+	val = readl_relaxed(base + UTMIP_HSRX_CFG1);
 	val &= ~UTMIP_HS_SYNC_START_DLY(~0);
 	val |= UTMIP_HS_SYNC_START_DLY(config->hssync_start_delay);
-	writel(val, base + UTMIP_HSRX_CFG1);
+	writel_relaxed(val, base + UTMIP_HSRX_CFG1);
 
-	val = readl(base + UTMIP_DEBOUNCE_CFG0);
+	val = readl_relaxed(base + UTMIP_DEBOUNCE_CFG0);
 	val &= ~UTMIP_BIAS_DEBOUNCE_A(~0);
 	val |= UTMIP_BIAS_DEBOUNCE_A(phy->freq->debounce);
-	writel(val, base + UTMIP_DEBOUNCE_CFG0);
+	writel_relaxed(val, base + UTMIP_DEBOUNCE_CFG0);
 
-	val = readl(base + UTMIP_MISC_CFG0);
+	val = readl_relaxed(base + UTMIP_MISC_CFG0);
 	val &= ~UTMIP_SUSPEND_EXIT_ON_EDGE;
-	writel(val, base + UTMIP_MISC_CFG0);
+	writel_relaxed(val, base + UTMIP_MISC_CFG0);
 
 	if (!phy->soc_config->utmi_pll_config_in_car_module) {
-		val = readl(base + UTMIP_MISC_CFG1);
+		val = readl_relaxed(base + UTMIP_MISC_CFG1);
 		val &= ~(UTMIP_PLL_ACTIVE_DLY_COUNT(~0) |
 			UTMIP_PLLU_STABLE_COUNT(~0));
 		val |= UTMIP_PLL_ACTIVE_DLY_COUNT(phy->freq->active_delay) |
 			UTMIP_PLLU_STABLE_COUNT(phy->freq->stable_count);
-		writel(val, base + UTMIP_MISC_CFG1);
+		writel_relaxed(val, base + UTMIP_MISC_CFG1);
 
-		val = readl(base + UTMIP_PLL_CFG1);
+		val = readl_relaxed(base + UTMIP_PLL_CFG1);
 		val &= ~(UTMIP_XTAL_FREQ_COUNT(~0) |
 			UTMIP_PLLU_ENABLE_DLY_COUNT(~0));
 		val |= UTMIP_XTAL_FREQ_COUNT(phy->freq->xtal_freq_count) |
 			UTMIP_PLLU_ENABLE_DLY_COUNT(phy->freq->enable_delay);
-		writel(val, base + UTMIP_PLL_CFG1);
+		writel_relaxed(val, base + UTMIP_PLL_CFG1);
 	}
 
 	if (phy->mode == USB_DR_MODE_PERIPHERAL) {
-		val = readl(base + USB_SUSP_CTRL);
+		val = readl_relaxed(base + USB_SUSP_CTRL);
 		val &= ~(USB_WAKE_ON_CNNT_EN_DEV | USB_WAKE_ON_DISCON_EN_DEV);
-		writel(val, base + USB_SUSP_CTRL);
+		writel_relaxed(val, base + USB_SUSP_CTRL);
 
-		val = readl(base + UTMIP_BAT_CHRG_CFG0);
+		val = readl_relaxed(base + UTMIP_BAT_CHRG_CFG0);
 		val &= ~UTMIP_PD_CHRG;
-		writel(val, base + UTMIP_BAT_CHRG_CFG0);
+		writel_relaxed(val, base + UTMIP_BAT_CHRG_CFG0);
 	} else {
-		val = readl(base + UTMIP_BAT_CHRG_CFG0);
+		val = readl_relaxed(base + UTMIP_BAT_CHRG_CFG0);
 		val |= UTMIP_PD_CHRG;
-		writel(val, base + UTMIP_BAT_CHRG_CFG0);
+		writel_relaxed(val, base + UTMIP_BAT_CHRG_CFG0);
 	}
 
 	err = utmip_pad_power_on(phy);
 	if (err)
 		return err;
 
-	val = readl(base + UTMIP_XCVR_CFG0);
+	val = readl_relaxed(base + UTMIP_XCVR_CFG0);
 	val &= ~(UTMIP_FORCE_PD_POWERDOWN | UTMIP_FORCE_PD2_POWERDOWN |
 		 UTMIP_FORCE_PDZI_POWERDOWN | UTMIP_XCVR_LSBIAS_SEL |
 		 UTMIP_XCVR_SETUP(~0) | UTMIP_XCVR_SETUP_MSB(~0) |
@@ -548,57 +549,57 @@ static int utmi_phy_power_on(struct tegra_usb_phy *phy)
 		val |= UTMIP_XCVR_HSSLEW(config->xcvr_hsslew);
 		val |= UTMIP_XCVR_HSSLEW_MSB(config->xcvr_hsslew);
 	}
-	writel(val, base + UTMIP_XCVR_CFG0);
+	writel_relaxed(val, base + UTMIP_XCVR_CFG0);
 
-	val = readl(base + UTMIP_XCVR_CFG1);
+	val = readl_relaxed(base + UTMIP_XCVR_CFG1);
 	val &= ~(UTMIP_FORCE_PDDISC_POWERDOWN | UTMIP_FORCE_PDCHRP_POWERDOWN |
 		 UTMIP_FORCE_PDDR_POWERDOWN | UTMIP_XCVR_TERM_RANGE_ADJ(~0));
 	val |= UTMIP_XCVR_TERM_RANGE_ADJ(config->term_range_adj);
-	writel(val, base + UTMIP_XCVR_CFG1);
+	writel_relaxed(val, base + UTMIP_XCVR_CFG1);
 
-	val = readl(base + UTMIP_BIAS_CFG1);
+	val = readl_relaxed(base + UTMIP_BIAS_CFG1);
 	val &= ~UTMIP_BIAS_PDTRK_COUNT(~0);
 	val |= UTMIP_BIAS_PDTRK_COUNT(0x5);
-	writel(val, base + UTMIP_BIAS_CFG1);
+	writel_relaxed(val, base + UTMIP_BIAS_CFG1);
 
-	val = readl(base + UTMIP_SPARE_CFG0);
+	val = readl_relaxed(base + UTMIP_SPARE_CFG0);
 	if (config->xcvr_setup_use_fuses)
 		val |= FUSE_SETUP_SEL;
 	else
 		val &= ~FUSE_SETUP_SEL;
-	writel(val, base + UTMIP_SPARE_CFG0);
+	writel_relaxed(val, base + UTMIP_SPARE_CFG0);
 
 	if (!phy->is_legacy_phy) {
-		val = readl(base + USB_SUSP_CTRL);
+		val = readl_relaxed(base + USB_SUSP_CTRL);
 		val |= UTMIP_PHY_ENABLE;
-		writel(val, base + USB_SUSP_CTRL);
+		writel_relaxed(val, base + USB_SUSP_CTRL);
 	}
 
-	val = readl(base + USB_SUSP_CTRL);
+	val = readl_relaxed(base + USB_SUSP_CTRL);
 	val &= ~UTMIP_RESET;
-	writel(val, base + USB_SUSP_CTRL);
+	writel_relaxed(val, base + USB_SUSP_CTRL);
 
 	if (phy->is_legacy_phy) {
-		val = readl(base + USB1_LEGACY_CTRL);
+		val = readl_relaxed(base + USB1_LEGACY_CTRL);
 		val &= ~USB1_VBUS_SENSE_CTL_MASK;
 		val |= USB1_VBUS_SENSE_CTL_A_SESS_VLD;
-		writel(val, base + USB1_LEGACY_CTRL);
+		writel_relaxed(val, base + USB1_LEGACY_CTRL);
 
-		val = readl(base + USB_SUSP_CTRL);
+		val = readl_relaxed(base + USB_SUSP_CTRL);
 		val &= ~USB_SUSP_SET;
-		writel(val, base + USB_SUSP_CTRL);
+		writel_relaxed(val, base + USB_SUSP_CTRL);
 	}
 
 	utmi_phy_clk_enable(phy);
 
 	if (phy->soc_config->requires_usbmode_setup) {
-		val = readl(base + USB_USBMODE);
+		val = readl_relaxed(base + USB_USBMODE);
 		val &= ~USB_USBMODE_MASK;
 		if (phy->mode == USB_DR_MODE_HOST)
 			val |= USB_USBMODE_HOST;
 		else
 			val |= USB_USBMODE_DEVICE;
-		writel(val, base + USB_USBMODE);
+		writel_relaxed(val, base + USB_USBMODE);
 	}
 
 	if (!phy->is_legacy_phy)
@@ -615,29 +616,29 @@ static int utmi_phy_power_off(struct tegra_usb_phy *phy)
 	utmi_phy_clk_disable(phy);
 
 	if (phy->mode == USB_DR_MODE_PERIPHERAL) {
-		val = readl(base + USB_SUSP_CTRL);
+		val = readl_relaxed(base + USB_SUSP_CTRL);
 		val &= ~USB_WAKEUP_DEBOUNCE_COUNT(~0);
 		val |= USB_WAKE_ON_CNNT_EN_DEV | USB_WAKEUP_DEBOUNCE_COUNT(5);
-		writel(val, base + USB_SUSP_CTRL);
+		writel_relaxed(val, base + USB_SUSP_CTRL);
 	}
 
-	val = readl(base + USB_SUSP_CTRL);
+	val = readl_relaxed(base + USB_SUSP_CTRL);
 	val |= UTMIP_RESET;
-	writel(val, base + USB_SUSP_CTRL);
+	writel_relaxed(val, base + USB_SUSP_CTRL);
 
-	val = readl(base + UTMIP_BAT_CHRG_CFG0);
+	val = readl_relaxed(base + UTMIP_BAT_CHRG_CFG0);
 	val |= UTMIP_PD_CHRG;
-	writel(val, base + UTMIP_BAT_CHRG_CFG0);
+	writel_relaxed(val, base + UTMIP_BAT_CHRG_CFG0);
 
-	val = readl(base + UTMIP_XCVR_CFG0);
+	val = readl_relaxed(base + UTMIP_XCVR_CFG0);
 	val |= UTMIP_FORCE_PD_POWERDOWN | UTMIP_FORCE_PD2_POWERDOWN |
 	       UTMIP_FORCE_PDZI_POWERDOWN;
-	writel(val, base + UTMIP_XCVR_CFG0);
+	writel_relaxed(val, base + UTMIP_XCVR_CFG0);
 
-	val = readl(base + UTMIP_XCVR_CFG1);
+	val = readl_relaxed(base + UTMIP_XCVR_CFG1);
 	val |= UTMIP_FORCE_PDDISC_POWERDOWN | UTMIP_FORCE_PDCHRP_POWERDOWN |
 	       UTMIP_FORCE_PDDR_POWERDOWN;
-	writel(val, base + UTMIP_XCVR_CFG1);
+	writel_relaxed(val, base + UTMIP_XCVR_CFG1);
 
 	return utmip_pad_power_off(phy);
 }
@@ -647,9 +648,9 @@ static void utmi_phy_preresume(struct tegra_usb_phy *phy)
 	void __iomem *base = phy->regs;
 	unsigned long val;
 
-	val = readl(base + UTMIP_TX_CFG0);
+	val = readl_relaxed(base + UTMIP_TX_CFG0);
 	val |= UTMIP_HS_DISCON_DISABLE;
-	writel(val, base + UTMIP_TX_CFG0);
+	writel_relaxed(val, base + UTMIP_TX_CFG0);
 }
 
 static void utmi_phy_postresume(struct tegra_usb_phy *phy)
@@ -657,9 +658,9 @@ static void utmi_phy_postresume(struct tegra_usb_phy *phy)
 	void __iomem *base = phy->regs;
 	unsigned long val;
 
-	val = readl(base + UTMIP_TX_CFG0);
+	val = readl_relaxed(base + UTMIP_TX_CFG0);
 	val &= ~UTMIP_HS_DISCON_DISABLE;
-	writel(val, base + UTMIP_TX_CFG0);
+	writel_relaxed(val, base + UTMIP_TX_CFG0);
 }
 
 static void utmi_phy_restore_start(struct tegra_usb_phy *phy,
@@ -668,18 +669,18 @@ static void utmi_phy_restore_start(struct tegra_usb_phy *phy,
 	void __iomem *base = phy->regs;
 	unsigned long val;
 
-	val = readl(base + UTMIP_MISC_CFG0);
+	val = readl_relaxed(base + UTMIP_MISC_CFG0);
 	val &= ~UTMIP_DPDM_OBSERVE_SEL(~0);
 	if (port_speed == TEGRA_USB_PHY_PORT_SPEED_LOW)
 		val |= UTMIP_DPDM_OBSERVE_SEL_FS_K;
 	else
 		val |= UTMIP_DPDM_OBSERVE_SEL_FS_J;
-	writel(val, base + UTMIP_MISC_CFG0);
+	writel_relaxed(val, base + UTMIP_MISC_CFG0);
 	usleep_range(1, 10);
 
-	val = readl(base + UTMIP_MISC_CFG0);
+	val = readl_relaxed(base + UTMIP_MISC_CFG0);
 	val |= UTMIP_DPDM_OBSERVE;
-	writel(val, base + UTMIP_MISC_CFG0);
+	writel_relaxed(val, base + UTMIP_MISC_CFG0);
 	usleep_range(10, 100);
 }
 
@@ -688,9 +689,9 @@ static void utmi_phy_restore_end(struct tegra_usb_phy *phy)
 	void __iomem *base = phy->regs;
 	unsigned long val;
 
-	val = readl(base + UTMIP_MISC_CFG0);
+	val = readl_relaxed(base + UTMIP_MISC_CFG0);
 	val &= ~UTMIP_DPDM_OBSERVE;
-	writel(val, base + UTMIP_MISC_CFG0);
+	writel_relaxed(val, base + UTMIP_MISC_CFG0);
 	usleep_range(10, 100);
 }
 
@@ -722,31 +723,31 @@ static int ulpi_phy_power_on(struct tegra_usb_phy *phy)
 
 	usleep_range(1000, 2000);
 
-	val = readl(base + USB_SUSP_CTRL);
+	val = readl_relaxed(base + USB_SUSP_CTRL);
 	val |= UHSIC_RESET;
-	writel(val, base + USB_SUSP_CTRL);
+	writel_relaxed(val, base + USB_SUSP_CTRL);
 
-	val = readl(base + ULPI_TIMING_CTRL_0);
+	val = readl_relaxed(base + ULPI_TIMING_CTRL_0);
 	val |= ULPI_OUTPUT_PINMUX_BYP | ULPI_CLKOUT_PINMUX_BYP;
-	writel(val, base + ULPI_TIMING_CTRL_0);
+	writel_relaxed(val, base + ULPI_TIMING_CTRL_0);
 
-	val = readl(base + USB_SUSP_CTRL);
+	val = readl_relaxed(base + USB_SUSP_CTRL);
 	val |= ULPI_PHY_ENABLE;
-	writel(val, base + USB_SUSP_CTRL);
+	writel_relaxed(val, base + USB_SUSP_CTRL);
 
 	val = 0;
-	writel(val, base + ULPI_TIMING_CTRL_1);
+	writel_relaxed(val, base + ULPI_TIMING_CTRL_1);
 
 	val |= ULPI_DATA_TRIMMER_SEL(4);
 	val |= ULPI_STPDIRNXT_TRIMMER_SEL(4);
 	val |= ULPI_DIR_TRIMMER_SEL(4);
-	writel(val, base + ULPI_TIMING_CTRL_1);
+	writel_relaxed(val, base + ULPI_TIMING_CTRL_1);
 	usleep_range(10, 100);
 
 	val |= ULPI_DATA_TRIMMER_LOAD;
 	val |= ULPI_STPDIRNXT_TRIMMER_LOAD;
 	val |= ULPI_DIR_TRIMMER_LOAD;
-	writel(val, base + ULPI_TIMING_CTRL_1);
+	writel_relaxed(val, base + ULPI_TIMING_CTRL_1);
 
 	/* Fix VbusInvalid due to floating VBUS */
 	err = usb_phy_io_write(phy->ulpi, 0x40, 0x08);
@@ -761,14 +762,14 @@ static int ulpi_phy_power_on(struct tegra_usb_phy *phy)
 		goto disable_clk;
 	}
 
-	val = readl(base + USB_SUSP_CTRL);
+	val = readl_relaxed(base + USB_SUSP_CTRL);
 	val |= USB_SUSP_CLR;
-	writel(val, base + USB_SUSP_CTRL);
+	writel_relaxed(val, base + USB_SUSP_CTRL);
 	usleep_range(100, 1000);
 
-	val = readl(base + USB_SUSP_CTRL);
+	val = readl_relaxed(base + USB_SUSP_CTRL);
 	val &= ~USB_SUSP_CLR;
-	writel(val, base + USB_SUSP_CTRL);
+	writel_relaxed(val, base + USB_SUSP_CTRL);
 
 	return 0;
 
-- 
2.24.0

[PATCH v3 05/16] usb: phy: tegra: Use generic stub for a missing VBUS regulator

[Dmitry Osipenko]

Regulator core provides dummy regulator if device-tree doesn't define VBUS
regulator.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/usb/phy/phy-tegra-usb.c | 28 +++++++++-------------------
 1 file changed, 9 insertions(+), 19 deletions(-)

diff --git a/drivers/usb/phy/phy-tegra-usb.c b/drivers/usb/phy/phy-tegra-usb.c
index 4d6d586c49cc..0a07efc9de06 100644
--- a/drivers/usb/phy/phy-tegra-usb.c
+++ b/drivers/usb/phy/phy-tegra-usb.c
@@ -798,9 +798,7 @@ static void tegra_usb_phy_shutdown(struct usb_phy *u_phy)
 	else
 		utmip_pad_close(phy);
 
-	if (!IS_ERR(phy->vbus))
-		regulator_disable(phy->vbus);
-
+	regulator_disable(phy->vbus);
 	clk_disable_unprepare(phy->pll_u);
 
 	phy->freq = NULL;
@@ -878,14 +876,11 @@ static int tegra_usb_phy_init(struct usb_phy *u_phy)
 		goto fail;
 	}
 
-	if (!IS_ERR(phy->vbus)) {
-		err = regulator_enable(phy->vbus);
-		if (err) {
-			dev_err(phy->u_phy.dev,
-				"Failed to enable USB VBUS regulator: %d\n",
-				err);
-			goto fail;
-		}
+	err = regulator_enable(phy->vbus);
+	if (err) {
+		dev_err(phy->u_phy.dev,
+			"Failed to enable USB VBUS regulator: %d\n", err);
+		goto fail;
 	}
 
 	if (phy->is_ulpi_phy)
@@ -1120,14 +1115,9 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
 	}
 
 	/* On some boards, the VBUS regulator doesn't need to be controlled */
-	if (of_find_property(np, "vbus-supply", NULL)) {
-		tegra_phy->vbus = devm_regulator_get(&pdev->dev, "vbus");
-		if (IS_ERR(tegra_phy->vbus))
-			return PTR_ERR(tegra_phy->vbus);
-	} else {
-		dev_notice(&pdev->dev, "no vbus regulator");
-		tegra_phy->vbus = ERR_PTR(-ENODEV);
-	}
+	tegra_phy->vbus = devm_regulator_get(&pdev->dev, "vbus");
+	if (IS_ERR(tegra_phy->vbus))
+		return PTR_ERR(tegra_phy->vbus);
 
 	tegra_phy->pll_u = devm_clk_get(&pdev->dev, "pll_u");
 	err = PTR_ERR_OR_ZERO(tegra_phy->pll_u);
-- 
2.24.0

[PATCH v3 06/16] usb: ulpi: Add resource-managed variant of otg_ulpi_create()

[Dmitry Osipenko]

Now drivers (like NVIDIA Tegra USB PHY for example) will be able to
benefit from the resource-managed variant, making driver's code a bit
cleaner.

Suggested-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/usb/phy/phy-ulpi.c | 48 +++++++++++++++++++++++++++++++-------
 include/linux/usb/ulpi.h   | 11 +++++++++
 2 files changed, 50 insertions(+), 9 deletions(-)

diff --git a/drivers/usb/phy/phy-ulpi.c b/drivers/usb/phy/phy-ulpi.c
index a43c49369a60..e683a37e3a7a 100644
--- a/drivers/usb/phy/phy-ulpi.c
+++ b/drivers/usb/phy/phy-ulpi.c
@@ -240,6 +240,21 @@ static int ulpi_set_vbus(struct usb_otg *otg, bool on)
 	return usb_phy_io_write(phy, flags, ULPI_OTG_CTRL);
 }
 
+static void otg_ulpi_init(struct usb_phy *phy, struct usb_otg *otg,
+			  struct usb_phy_io_ops *ops,
+			  unsigned int flags)
+{
+	phy->label	= "ULPI";
+	phy->flags	= flags;
+	phy->io_ops	= ops;
+	phy->otg	= otg;
+	phy->init	= ulpi_init;
+
+	otg->usb_phy	= phy;
+	otg->set_host	= ulpi_set_host;
+	otg->set_vbus	= ulpi_set_vbus;
+}
+
 struct usb_phy *
 otg_ulpi_create(struct usb_phy_io_ops *ops,
 		unsigned int flags)
@@ -257,17 +272,32 @@ otg_ulpi_create(struct usb_phy_io_ops *ops,
 		return NULL;
 	}
 
-	phy->label	= "ULPI";
-	phy->flags	= flags;
-	phy->io_ops	= ops;
-	phy->otg	= otg;
-	phy->init	= ulpi_init;
-
-	otg->usb_phy	= phy;
-	otg->set_host	= ulpi_set_host;
-	otg->set_vbus	= ulpi_set_vbus;
+	otg_ulpi_init(phy, otg, ops, flags);
 
 	return phy;
 }
 EXPORT_SYMBOL_GPL(otg_ulpi_create);
 
+struct usb_phy *
+devm_otg_ulpi_create(struct device *dev,
+		     struct usb_phy_io_ops *ops,
+		     unsigned int flags)
+{
+	struct usb_phy *phy;
+	struct usb_otg *otg;
+
+	phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
+	if (!phy)
+		return NULL;
+
+	otg = devm_kzalloc(dev, sizeof(*otg), GFP_KERNEL);
+	if (!otg) {
+		devm_kfree(dev, phy);
+		return NULL;
+	}
+
+	otg_ulpi_init(phy, otg, ops, flags);
+
+	return phy;
+}
+EXPORT_SYMBOL_GPL(devm_otg_ulpi_create);
diff --git a/include/linux/usb/ulpi.h b/include/linux/usb/ulpi.h
index c515765adab7..36c2982780ad 100644
--- a/include/linux/usb/ulpi.h
+++ b/include/linux/usb/ulpi.h
@@ -55,12 +55,23 @@
 #if IS_ENABLED(CONFIG_USB_ULPI)
 struct usb_phy *otg_ulpi_create(struct usb_phy_io_ops *ops,
 					unsigned int flags);
+
+struct usb_phy *devm_otg_ulpi_create(struct device *dev,
+				     struct usb_phy_io_ops *ops,
+				     unsigned int flags);
 #else
 static inline struct usb_phy *otg_ulpi_create(struct usb_phy_io_ops *ops,
 					      unsigned int flags)
 {
 	return NULL;
 }
+
+static inline struct usb_phy *devm_otg_ulpi_create(struct device *dev,
+						   struct usb_phy_io_ops *ops,
+						   unsigned int flags)
+{
+	return NULL;
+}
 #endif
 
 #ifdef CONFIG_USB_ULPI_VIEWPORT
-- 
2.24.0

[PATCH v3 07/16] usb: phy: tegra: Use devm_otg_ulpi_create()

[Dmitry Osipenko]

The resource-managed variant removes the necessity for the driver to care
about freeing ULPI resources.

Suggested-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/usb/phy/phy-tegra-usb.c | 22 ++++++----------------
 1 file changed, 6 insertions(+), 16 deletions(-)

diff --git a/drivers/usb/phy/phy-tegra-usb.c b/drivers/usb/phy/phy-tegra-usb.c
index 0a07efc9de06..a3d102f6f81e 100644
--- a/drivers/usb/phy/phy-tegra-usb.c
+++ b/drivers/usb/phy/phy-tegra-usb.c
@@ -1080,6 +1080,7 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
 	enum usb_phy_interface phy_type;
 	struct reset_control *reset;
 	struct resource *res;
+	struct usb_phy *phy;
 	int err;
 
 	tegra_phy = devm_kzalloc(&pdev->dev, sizeof(*tegra_phy), GFP_KERNEL);
@@ -1180,12 +1181,14 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
 			return err;
 		}
 
-		tegra_phy->ulpi = otg_ulpi_create(&ulpi_viewport_access_ops, 0);
-		if (!tegra_phy->ulpi) {
+		phy = devm_otg_ulpi_create(&pdev->dev,
+					   &ulpi_viewport_access_ops, 0);
+		if (!phy) {
 			dev_err(&pdev->dev, "Failed to create ULPI OTG\n");
 			return -ENOMEM;
 		}
 
+		tegra_phy->ulpi = phy;
 		tegra_phy->ulpi->io_priv = tegra_phy->regs + ULPI_VIEWPORT;
 		break;
 
@@ -1204,17 +1207,9 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
 
 	err = usb_add_phy_dev(&tegra_phy->u_phy);
 	if (err)
-		goto free_ulpi;
+		return err;
 
 	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)
@@ -1223,11 +1218,6 @@ static int tegra_usb_phy_remove(struct platform_device *pdev)
 
 	usb_remove_phy(&tegra_phy->u_phy);
 
-	if (tegra_phy->ulpi) {
-		kfree(tegra_phy->ulpi->otg);
-		kfree(tegra_phy->ulpi);
-	}
-
 	return 0;
 }
 
-- 
2.24.0

[PATCH v3 08/16] usb: phy: tegra: Use u32 for hardware register variables

[Dmitry Osipenko]

There is a mix of u32/ULONG usage in the driver's code. Let's switch to
u32 uniformly, for consistency.

Suggested-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/usb/phy/phy-tegra-usb.c | 28 +++++++++++++++-------------
 1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/drivers/usb/phy/phy-tegra-usb.c b/drivers/usb/phy/phy-tegra-usb.c
index a3d102f6f81e..0845fc0fb3f8 100644
--- a/drivers/usb/phy/phy-tegra-usb.c
+++ b/drivers/usb/phy/phy-tegra-usb.c
@@ -202,7 +202,7 @@ static inline struct tegra_usb_phy *to_tegra_usb_phy(struct usb_phy *u_phy)
 static void set_pts(struct tegra_usb_phy *phy, u8 pts_val)
 {
 	void __iomem *base = phy->regs;
-	unsigned long val;
+	u32 val;
 
 	if (phy->soc_config->has_hostpc) {
 		val = readl_relaxed(base + TEGRA_USB_HOSTPC1_DEVLC);
@@ -221,7 +221,7 @@ static void set_pts(struct tegra_usb_phy *phy, u8 pts_val)
 static void set_phcd(struct tegra_usb_phy *phy, bool enable)
 {
 	void __iomem *base = phy->regs;
-	unsigned long val;
+	u32 val;
 
 	if (phy->soc_config->has_hostpc) {
 		val = readl_relaxed(base + TEGRA_USB_HOSTPC1_DEVLC);
@@ -320,7 +320,8 @@ static int utmip_pad_power_on(struct tegra_usb_phy *phy)
 {
 	struct tegra_utmip_config *config = phy->config;
 	void __iomem *base = phy->pad_regs;
-	unsigned long val, flags;
+	unsigned long flags;
+	u32 val;
 	int err;
 
 	err = clk_prepare_enable(phy->pad_clk);
@@ -355,7 +356,8 @@ static int utmip_pad_power_on(struct tegra_usb_phy *phy)
 static int utmip_pad_power_off(struct tegra_usb_phy *phy)
 {
 	void __iomem *base = phy->pad_regs;
-	unsigned long val, flags;
+	unsigned long flags;
+	u32 val;
 	int err;
 
 	if (!utmip_pad_count) {
@@ -393,7 +395,7 @@ static int utmi_wait_register(void __iomem *reg, u32 mask, u32 result)
 static void utmi_phy_clk_disable(struct tegra_usb_phy *phy)
 {
 	void __iomem *base = phy->regs;
-	unsigned long val;
+	u32 val;
 
 	/*
 	 * The USB driver may have already initiated the phy clock
@@ -425,7 +427,7 @@ static void utmi_phy_clk_disable(struct tegra_usb_phy *phy)
 static void utmi_phy_clk_enable(struct tegra_usb_phy *phy)
 {
 	void __iomem *base = phy->regs;
-	unsigned long val;
+	u32 val;
 
 	/*
 	 * The USB driver may have already initiated the phy clock
@@ -460,7 +462,7 @@ static int utmi_phy_power_on(struct tegra_usb_phy *phy)
 {
 	struct tegra_utmip_config *config = phy->config;
 	void __iomem *base = phy->regs;
-	unsigned long val;
+	u32 val;
 	int err;
 
 	val = readl_relaxed(base + USB_SUSP_CTRL);
@@ -611,7 +613,7 @@ static int utmi_phy_power_on(struct tegra_usb_phy *phy)
 static int utmi_phy_power_off(struct tegra_usb_phy *phy)
 {
 	void __iomem *base = phy->regs;
-	unsigned long val;
+	u32 val;
 
 	utmi_phy_clk_disable(phy);
 
@@ -646,7 +648,7 @@ static int utmi_phy_power_off(struct tegra_usb_phy *phy)
 static void utmi_phy_preresume(struct tegra_usb_phy *phy)
 {
 	void __iomem *base = phy->regs;
-	unsigned long val;
+	u32 val;
 
 	val = readl_relaxed(base + UTMIP_TX_CFG0);
 	val |= UTMIP_HS_DISCON_DISABLE;
@@ -656,7 +658,7 @@ static void utmi_phy_preresume(struct tegra_usb_phy *phy)
 static void utmi_phy_postresume(struct tegra_usb_phy *phy)
 {
 	void __iomem *base = phy->regs;
-	unsigned long val;
+	u32 val;
 
 	val = readl_relaxed(base + UTMIP_TX_CFG0);
 	val &= ~UTMIP_HS_DISCON_DISABLE;
@@ -667,7 +669,7 @@ static void utmi_phy_restore_start(struct tegra_usb_phy *phy,
 				   enum tegra_usb_phy_port_speed port_speed)
 {
 	void __iomem *base = phy->regs;
-	unsigned long val;
+	u32 val;
 
 	val = readl_relaxed(base + UTMIP_MISC_CFG0);
 	val &= ~UTMIP_DPDM_OBSERVE_SEL(~0);
@@ -687,7 +689,7 @@ static void utmi_phy_restore_start(struct tegra_usb_phy *phy,
 static void utmi_phy_restore_end(struct tegra_usb_phy *phy)
 {
 	void __iomem *base = phy->regs;
-	unsigned long val;
+	u32 val;
 
 	val = readl_relaxed(base + UTMIP_MISC_CFG0);
 	val &= ~UTMIP_DPDM_OBSERVE;
@@ -698,7 +700,7 @@ static void utmi_phy_restore_end(struct tegra_usb_phy *phy)
 static int ulpi_phy_power_on(struct tegra_usb_phy *phy)
 {
 	void __iomem *base = phy->regs;
-	unsigned long val;
+	u32 val;
 	int err;
 
 	err = gpio_direction_output(phy->reset_gpio, 0);
-- 
2.24.0

[PATCH v3 09/16] usb: phy: tegra: Assert reset on ULPI close instead of deasserting it

[Dmitry Osipenko]

Apparently ULPI was meant to be put into reset on PHY's shutdown (which is
active-low state of the GPIO), but there is a typo in the code.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/usb/phy/phy-tegra-usb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/phy/phy-tegra-usb.c b/drivers/usb/phy/phy-tegra-usb.c
index 0845fc0fb3f8..1ecd9f7900af 100644
--- a/drivers/usb/phy/phy-tegra-usb.c
+++ b/drivers/usb/phy/phy-tegra-usb.c
@@ -308,7 +308,7 @@ static void ulpi_close(struct tegra_usb_phy *phy)
 {
 	int err;
 
-	err = gpio_direction_output(phy->reset_gpio, 1);
+	err = gpio_direction_output(phy->reset_gpio, 0);
 	if (err) {
 		dev_err(phy->u_phy.dev,
 			"ULPI reset GPIO %d direction not asserted: %d\n",
-- 
2.24.0

[PATCH v3 10/16] usb: phy: tegra: Use device-tree notion of reset-GPIO's active-state

[Dmitry Osipenko]

It is much more intuitive if reset is treated as asserted when GPIO value
is set to 1. All NVIDIA Tegra device-trees are properly specifying active
state of the reset-GPIO since 2013, let's clean up that part of the code.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/usb/phy/phy-tegra-usb.c   | 58 ++++++++-----------------------
 include/linux/usb/tegra_usb_phy.h |  3 +-
 2 files changed, 17 insertions(+), 44 deletions(-)

diff --git a/drivers/usb/phy/phy-tegra-usb.c b/drivers/usb/phy/phy-tegra-usb.c
index 1ecd9f7900af..cc6cca4dcecb 100644
--- a/drivers/usb/phy/phy-tegra-usb.c
+++ b/drivers/usb/phy/phy-tegra-usb.c
@@ -306,14 +306,7 @@ static int utmip_pad_close(struct tegra_usb_phy *phy)
 
 static void ulpi_close(struct tegra_usb_phy *phy)
 {
-	int err;
-
-	err = gpio_direction_output(phy->reset_gpio, 0);
-	if (err) {
-		dev_err(phy->u_phy.dev,
-			"ULPI reset GPIO %d direction not asserted: %d\n",
-			phy->reset_gpio, err);
-	}
+	gpiod_set_value_cansleep(phy->reset_gpio, 1);
 }
 
 static int utmip_pad_power_on(struct tegra_usb_phy *phy)
@@ -703,12 +696,7 @@ static int ulpi_phy_power_on(struct tegra_usb_phy *phy)
 	u32 val;
 	int err;
 
-	err = gpio_direction_output(phy->reset_gpio, 0);
-	if (err) {
-		dev_err(phy->u_phy.dev, "GPIO %d not set to 0: %d\n",
-			phy->reset_gpio, err);
-		return err;
-	}
+	gpiod_set_value_cansleep(phy->reset_gpio, 1);
 
 	err = clk_prepare_enable(phy->clk);
 	if (err)
@@ -716,12 +704,7 @@ static int ulpi_phy_power_on(struct tegra_usb_phy *phy)
 
 	usleep_range(5000, 10000);
 
-	err = gpio_direction_output(phy->reset_gpio, 1);
-	if (err) {
-		dev_err(phy->u_phy.dev, "GPIO %d not set to 1: %d\n",
-			phy->reset_gpio, err);
-		goto disable_clk;
-	}
+	gpiod_set_value_cansleep(phy->reset_gpio, 0);
 
 	usleep_range(1000, 2000);
 
@@ -784,8 +767,9 @@ static int ulpi_phy_power_on(struct tegra_usb_phy *phy)
 static int ulpi_phy_power_off(struct tegra_usb_phy *phy)
 {
 	clk_disable_unprepare(phy->clk);
+	gpiod_set_value_cansleep(phy->reset_gpio, 1);
 
-	return gpio_direction_output(phy->reset_gpio, 0);
+	return 0;
 }
 
 static void tegra_usb_phy_shutdown(struct usb_phy *u_phy)
@@ -837,15 +821,7 @@ static int tegra_usb_phy_set_suspend(struct usb_phy *u_phy, int suspend)
 
 static int ulpi_open(struct tegra_usb_phy *phy)
 {
-	int err;
-
-	err = gpio_direction_output(phy->reset_gpio, 0);
-	if (err) {
-		dev_err(phy->u_phy.dev,
-			"ULPI reset GPIO %d direction not deasserted: %d\n",
-			phy->reset_gpio, err);
-		return err;
-	}
+	gpiod_set_value_cansleep(phy->reset_gpio, 1);
 
 	return 0;
 }
@@ -1081,6 +1057,7 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
 	struct tegra_usb_phy *tegra_phy;
 	enum usb_phy_interface phy_type;
 	struct reset_control *reset;
+	struct gpio_desc *gpiod;
 	struct resource *res;
 	struct usb_phy *phy;
 	int err;
@@ -1158,15 +1135,6 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
 	case USBPHY_INTERFACE_MODE_ULPI:
 		tegra_phy->is_ulpi_phy = true;
 
-		tegra_phy->reset_gpio =
-			of_get_named_gpio(np, "nvidia,phy-reset-gpio", 0);
-
-		if (!gpio_is_valid(tegra_phy->reset_gpio)) {
-			dev_err(&pdev->dev,
-				"Invalid GPIO: %d\n", tegra_phy->reset_gpio);
-			return tegra_phy->reset_gpio;
-		}
-
 		tegra_phy->clk = devm_clk_get(&pdev->dev, "ulpi-link");
 		err = PTR_ERR_OR_ZERO(tegra_phy->clk);
 		if (err) {
@@ -1175,13 +1143,17 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
 			return err;
 		}
 
-		err = devm_gpio_request(&pdev->dev, tegra_phy->reset_gpio,
-					"ulpi_phy_reset_b");
+		gpiod = devm_gpiod_get_from_of_node(&pdev->dev, np,
+						    "nvidia,phy-reset-gpio",
+						    0, GPIOD_OUT_HIGH,
+						    "ulpi_phy_reset_b");
+		err = PTR_ERR_OR_ZERO(gpiod);
 		if (err) {
-			dev_err(&pdev->dev, "Request failed for GPIO %d: %d\n",
-				tegra_phy->reset_gpio, err);
+			dev_err(&pdev->dev,
+				"Request failed for reset GPIO: %d\n", err);
 			return err;
 		}
+		tegra_phy->reset_gpio = gpiod;
 
 		phy = devm_otg_ulpi_create(&pdev->dev,
 					   &ulpi_viewport_access_ops, 0);
diff --git a/include/linux/usb/tegra_usb_phy.h b/include/linux/usb/tegra_usb_phy.h
index 0c5c3ea8b2d7..6b857fe13b35 100644
--- a/include/linux/usb/tegra_usb_phy.h
+++ b/include/linux/usb/tegra_usb_phy.h
@@ -17,6 +17,7 @@
 #define __TEGRA_USB_PHY_H
 
 #include <linux/clk.h>
+#include <linux/gpio.h>
 #include <linux/reset.h>
 #include <linux/usb/otg.h>
 
@@ -76,7 +77,7 @@ struct tegra_usb_phy {
 	struct usb_phy u_phy;
 	bool is_legacy_phy;
 	bool is_ulpi_phy;
-	int reset_gpio;
+	struct gpio_desc *reset_gpio;
 	struct reset_control *pad_rst;
 };
 
-- 
2.24.0

Re: [PATCH v3 10/16] usb: phy: tegra: Use device-tree notion of reset-GPIO's active-state

[Michał Mirosław]

On Sat, Dec 28, 2019 at 11:33:52PM +0300, Dmitry Osipenko wrote:
[...]
>  static int ulpi_open(struct tegra_usb_phy *phy)
>  {
> -	int err;
> -
> -	err = gpio_direction_output(phy->reset_gpio, 0);
> -	if (err) {
> -		dev_err(phy->u_phy.dev,
> -			"ULPI reset GPIO %d direction not deasserted: %d\n",
> -			phy->reset_gpio, err);
> -		return err;
> -	}
> +	gpiod_set_value_cansleep(phy->reset_gpio, 1);
>  
>  	return 0;
>  }

The message now removed seems inverted to the meaning of the code. Is
this a bug, or the reset really should be asserted here? I can see that
it is deasserted in phy_power_up, but that goes before or after ulpi_open()?
After the change below, the reset is asserted at probe() time now.

[...]
> -		err = devm_gpio_request(&pdev->dev, tegra_phy->reset_gpio,
> -					"ulpi_phy_reset_b");
> +		gpiod = devm_gpiod_get_from_of_node(&pdev->dev, np,
> +						    "nvidia,phy-reset-gpio",
> +						    0, GPIOD_OUT_HIGH,
> +						    "ulpi_phy_reset_b");
> +		err = PTR_ERR_OR_ZERO(gpiod);
>  		if (err) {
> -			dev_err(&pdev->dev, "Request failed for GPIO %d: %d\n",
> -				tegra_phy->reset_gpio, err);
> +			dev_err(&pdev->dev,
> +				"Request failed for reset GPIO: %d\n", err);
>  			return err;
>  		}
> +		tegra_phy->reset_gpio = gpiod;

A nice extension to kernel's printf - "%pe" format - has just landed in
Linus' master tree.

Best Regards,
Michał Mirosław

Re: [PATCH v3 10/16] usb: phy: tegra: Use device-tree notion of reset-GPIO's active-state

[Dmitry Osipenko]

03.01.2020 10:58, Michał Mirosław пишет:
> On Sat, Dec 28, 2019 at 11:33:52PM +0300, Dmitry Osipenko wrote:
> [...]
>>  static int ulpi_open(struct tegra_usb_phy *phy)
>>  {
>> -	int err;
>> -
>> -	err = gpio_direction_output(phy->reset_gpio, 0);
>> -	if (err) {
>> -		dev_err(phy->u_phy.dev,
>> -			"ULPI reset GPIO %d direction not deasserted: %d\n",
>> -			phy->reset_gpio, err);
>> -		return err;
>> -	}
>> +	gpiod_set_value_cansleep(phy->reset_gpio, 1);
>>  
>>  	return 0;
>>  }
> 
> The message now removed seems inverted to the meaning of the code. Is
> this a bug, or the reset really should be asserted here?

The removed message was added in patch #2 and indeed it should say
"asserted". Good catch, thanks!

> I can see that
> it is deasserted in phy_power_up, but that goes before or after ulpi_open()?

The ulpi_phy_power_on happens after the ulpi_open, please take a look at
tegra_usb_phy_init().

> After the change below, the reset is asserted at probe() time now.

Yes, the probe now asserts the reset. It is an intended change because
it should be a bit better to explicitly per-initialize the GPIO state to
an expected state during of the GPIO retrieval, like most of other
drivers do and which should be a "generic/common way".

Actually, the reset assertion of ulpi_open() could be removed safely now
since it doesn't do anything useful, given that probe asserts the reset.

> [...]
>> -		err = devm_gpio_request(&pdev->dev, tegra_phy->reset_gpio,
>> -					"ulpi_phy_reset_b");
>> +		gpiod = devm_gpiod_get_from_of_node(&pdev->dev, np,
>> +						    "nvidia,phy-reset-gpio",
>> +						    0, GPIOD_OUT_HIGH,
>> +						    "ulpi_phy_reset_b");
>> +		err = PTR_ERR_OR_ZERO(gpiod);
>>  		if (err) {
>> -			dev_err(&pdev->dev, "Request failed for GPIO %d: %d\n",
>> -				tegra_phy->reset_gpio, err);
>> +			dev_err(&pdev->dev,
>> +				"Request failed for reset GPIO: %d\n", err);
>>  			return err;
>>  		}
>> +		tegra_phy->reset_gpio = gpiod;
> 
> A nice extension to kernel's printf - "%pe" format - has just landed in
> Linus' master tree.

Thank you very much, I didn't know about that.

I'll prepare v4 with the above things addressed, thank you again and
please let me know if you'll spot anything else!

Re: [PATCH v3 10/16] usb: phy: tegra: Use device-tree notion of reset-GPIO's active-state

[Dmitry Osipenko]

04.01.2020 02:53, Dmitry Osipenko пишет:
> 03.01.2020 10:58, Michał Mirosław пишет:
[snip]
>> [...]
>>> -		err = devm_gpio_request(&pdev->dev, tegra_phy->reset_gpio,
>>> -					"ulpi_phy_reset_b");
>>> +		gpiod = devm_gpiod_get_from_of_node(&pdev->dev, np,
>>> +						    "nvidia,phy-reset-gpio",
>>> +						    0, GPIOD_OUT_HIGH,
>>> +						    "ulpi_phy_reset_b");
>>> +		err = PTR_ERR_OR_ZERO(gpiod);
>>>  		if (err) {
>>> -			dev_err(&pdev->dev, "Request failed for GPIO %d: %d\n",
>>> -				tegra_phy->reset_gpio, err);
>>> +			dev_err(&pdev->dev,
>>> +				"Request failed for reset GPIO: %d\n", err);
>>>  			return err;
>>>  		}
>>> +		tegra_phy->reset_gpio = gpiod;
>>
>> A nice extension to kernel's printf - "%pe" format - has just landed in
>> Linus' master tree.
> 
> Thank you very much, I didn't know about that.

In this particular case PTR_ERR_OR_ZERO() results in a bit more cleaner
code than with IS_ERR() and PTR_ERR() [IMHO], so I'll probably keep it
as-is. Anyways, thanks again for the pointer to "%pe", it could come
handy later on.

[PATCH v3 11/16] usb: phy: tegra: Disable VBUS regulator on tegra_usb_phy_init failure

[Dmitry Osipenko]

VBUS regulator should be turned off in a case of error.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/usb/phy/phy-tegra-usb.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/phy/phy-tegra-usb.c b/drivers/usb/phy/phy-tegra-usb.c
index cc6cca4dcecb..f7e7df812f83 100644
--- a/drivers/usb/phy/phy-tegra-usb.c
+++ b/drivers/usb/phy/phy-tegra-usb.c
@@ -851,14 +851,14 @@ static int tegra_usb_phy_init(struct usb_phy *u_phy)
 		dev_err(phy->u_phy.dev, "Invalid pll_u parent rate %ld\n",
 			parent_rate);
 		err = -EINVAL;
-		goto fail;
+		goto disable_clk;
 	}
 
 	err = regulator_enable(phy->vbus);
 	if (err) {
 		dev_err(phy->u_phy.dev,
 			"Failed to enable USB VBUS regulator: %d\n", err);
-		goto fail;
+		goto disable_clk;
 	}
 
 	if (phy->is_ulpi_phy)
@@ -866,7 +866,7 @@ static int tegra_usb_phy_init(struct usb_phy *u_phy)
 	else
 		err = utmip_pad_open(phy);
 	if (err)
-		goto fail;
+		goto disable_vbus;
 
 	err = tegra_usb_phy_power_on(phy);
 	if (err)
@@ -879,7 +879,11 @@ static int tegra_usb_phy_init(struct usb_phy *u_phy)
 		ulpi_close(phy);
 	else
 		utmip_pad_close(phy);
-fail:
+
+disable_vbus:
+	regulator_disable(phy->vbus);
+
+disable_clk:
 	clk_disable_unprepare(phy->pll_u);
 
 	phy->freq = NULL;
-- 
2.24.0

[PATCH v3 12/16] usb: phy: tegra: Move utmip_pad_count checking under lock

[Dmitry Osipenko]

It's unlikely that two drivers could manage PHY's state simultaneously in
practice, nevertheless the utmip_pad_count checking should be under lock,
for consistency.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/usb/phy/phy-tegra-usb.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/usb/phy/phy-tegra-usb.c b/drivers/usb/phy/phy-tegra-usb.c
index f7e7df812f83..72825d207840 100644
--- a/drivers/usb/phy/phy-tegra-usb.c
+++ b/drivers/usb/phy/phy-tegra-usb.c
@@ -351,30 +351,31 @@ static int utmip_pad_power_off(struct tegra_usb_phy *phy)
 	void __iomem *base = phy->pad_regs;
 	unsigned long flags;
 	u32 val;
-	int err;
+	int ret;
+
+	ret = clk_prepare_enable(phy->pad_clk);
+	if (ret)
+		return ret;
+
+	spin_lock_irqsave(&utmip_pad_lock, flags);
 
 	if (!utmip_pad_count) {
 		dev_err(phy->u_phy.dev, "UTMIP pad already powered off\n");
-		return -EINVAL;
+		ret = -EINVAL;
+		goto ulock;
 	}
 
-	err = clk_prepare_enable(phy->pad_clk);
-	if (err)
-		return err;
-
-	spin_lock_irqsave(&utmip_pad_lock, flags);
-
 	if (--utmip_pad_count == 0) {
 		val = readl_relaxed(base + UTMIP_BIAS_CFG0);
 		val |= UTMIP_OTGPD | UTMIP_BIASPD;
 		writel_relaxed(val, base + UTMIP_BIAS_CFG0);
 	}
-
+ulock:
 	spin_unlock_irqrestore(&utmip_pad_lock, flags);
 
 	clk_disable_unprepare(phy->pad_clk);
 
-	return 0;
+	return ret;
 }
 
 static int utmi_wait_register(void __iomem *reg, u32 mask, u32 result)
-- 
2.24.0

[PATCH v3 13/16] usb: phy: tegra: Keep CPU interrupts enabled

[Dmitry Osipenko]

There is no good reason for disabling of CPU interrupts in order to
protect the utmip_pad_count modification.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/usb/phy/phy-tegra-usb.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/phy/phy-tegra-usb.c b/drivers/usb/phy/phy-tegra-usb.c
index 72825d207840..b0c4f304a5ba 100644
--- a/drivers/usb/phy/phy-tegra-usb.c
+++ b/drivers/usb/phy/phy-tegra-usb.c
@@ -313,7 +313,6 @@ static int utmip_pad_power_on(struct tegra_usb_phy *phy)
 {
 	struct tegra_utmip_config *config = phy->config;
 	void __iomem *base = phy->pad_regs;
-	unsigned long flags;
 	u32 val;
 	int err;
 
@@ -321,7 +320,7 @@ static int utmip_pad_power_on(struct tegra_usb_phy *phy)
 	if (err)
 		return err;
 
-	spin_lock_irqsave(&utmip_pad_lock, flags);
+	spin_lock(&utmip_pad_lock);
 
 	if (utmip_pad_count++ == 0) {
 		val = readl_relaxed(base + UTMIP_BIAS_CFG0);
@@ -339,7 +338,7 @@ static int utmip_pad_power_on(struct tegra_usb_phy *phy)
 		writel_relaxed(val, base + UTMIP_BIAS_CFG0);
 	}
 
-	spin_unlock_irqrestore(&utmip_pad_lock, flags);
+	spin_unlock(&utmip_pad_lock);
 
 	clk_disable_unprepare(phy->pad_clk);
 
@@ -349,7 +348,6 @@ static int utmip_pad_power_on(struct tegra_usb_phy *phy)
 static int utmip_pad_power_off(struct tegra_usb_phy *phy)
 {
 	void __iomem *base = phy->pad_regs;
-	unsigned long flags;
 	u32 val;
 	int ret;
 
@@ -357,7 +355,7 @@ static int utmip_pad_power_off(struct tegra_usb_phy *phy)
 	if (ret)
 		return ret;
 
-	spin_lock_irqsave(&utmip_pad_lock, flags);
+	spin_lock(&utmip_pad_lock);
 
 	if (!utmip_pad_count) {
 		dev_err(phy->u_phy.dev, "UTMIP pad already powered off\n");
@@ -371,7 +369,7 @@ static int utmip_pad_power_off(struct tegra_usb_phy *phy)
 		writel_relaxed(val, base + UTMIP_BIAS_CFG0);
 	}
 ulock:
-	spin_unlock_irqrestore(&utmip_pad_lock, flags);
+	spin_unlock(&utmip_pad_lock);
 
 	clk_disable_unprepare(phy->pad_clk);
 
-- 
2.24.0

Re: [PATCH v3 13/16] usb: phy: tegra: Keep CPU interrupts enabled

[Michał Mirosław]

On Sat, Dec 28, 2019 at 11:33:55PM +0300, Dmitry Osipenko wrote:
> There is no good reason for disabling of CPU interrupts in order to
> protect the utmip_pad_count modification.

Since there are sleeping functions called outside of the locked sections,
this should be a mutex instead. OTOH if the spin_lock is to protect register
write against IRQ handler, then the patch is wrong.

[...]
> -	spin_unlock_irqrestore(&utmip_pad_lock, flags);
> +	spin_unlock(&utmip_pad_lock);
>  
>  	clk_disable_unprepare(phy->pad_clk);

Best Regards,
Michał Mirosław

Re: [PATCH v3 13/16] usb: phy: tegra: Keep CPU interrupts enabled

[Dmitry Osipenko]

30.12.2019 23:36, Michał Mirosław пишет:
> On Sat, Dec 28, 2019 at 11:33:55PM +0300, Dmitry Osipenko wrote:
>> There is no good reason for disabling of CPU interrupts in order to
>> protect the utmip_pad_count modification.
> 
> Since there are sleeping functions called outside of the locked sections,
> this should be a mutex instead. OTOH if the spin_lock is to protect register
> write against IRQ handler, then the patch is wrong.
> 
> [...]
>> -	spin_unlock_irqrestore(&utmip_pad_lock, flags);
>> +	spin_unlock(&utmip_pad_lock);
>>  
>>  	clk_disable_unprepare(phy->pad_clk);

Hello Michał,

This spinlock isn't for protecting from the IRQ handler, it's used
solely to protect modification of the registers that are shared by all
USB controllers.

It's possible to use mutex instead of spinlock here, but it doesn't
bring any benefits because mutex is more useful when protected code
could block for a long time due to sleep or whatever, while spinlock is
much more efficient when protected code doesn't sleep and takes no more
than dozens microseconds to execute (which is the case here).

In this particular case of the Tegra USB PHY driver, the chance of
getting a block on taking the utmip_pad_lock is zero unless USB
controller drivers will start to use asynchronous probing. So this patch
does a very minor clean-up change and nothing more.

Re: [PATCH v3 13/16] usb: phy: tegra: Keep CPU interrupts enabled

[Michał Mirosław]

On Thu, Jan 02, 2020 at 05:40:48PM +0300, Dmitry Osipenko wrote:
> 30.12.2019 23:36, Michał Mirosław пишет:
> > On Sat, Dec 28, 2019 at 11:33:55PM +0300, Dmitry Osipenko wrote:
> >> There is no good reason for disabling of CPU interrupts in order to
> >> protect the utmip_pad_count modification.
> > 
> > Since there are sleeping functions called outside of the locked sections,
> > this should be a mutex instead. OTOH if the spin_lock is to protect register
> > write against IRQ handler, then the patch is wrong.
> > 
> > [...]
> >> -	spin_unlock_irqrestore(&utmip_pad_lock, flags);
> >> +	spin_unlock(&utmip_pad_lock);
> >>  
> >>  	clk_disable_unprepare(phy->pad_clk);
> 
> Hello Michał,
> 
> This spinlock isn't for protecting from the IRQ handler, it's used
> solely to protect modification of the registers that are shared by all
> USB controllers.
> 
> It's possible to use mutex instead of spinlock here, but it doesn't
> bring any benefits because mutex is more useful when protected code
> could block for a long time due to sleep or whatever, while spinlock is
> much more efficient when protected code doesn't sleep and takes no more
> than dozens microseconds to execute (which is the case here).
> 
> In this particular case of the Tegra USB PHY driver, the chance of
> getting a block on taking the utmip_pad_lock is zero unless USB
> controller drivers will start to use asynchronous probing. So this patch
> does a very minor clean-up change and nothing more.

I was concerned that this change allows the kernel to switch away to
another task, but I can see now that spin_lock() does disable preemtion.
So it looks OK after all. Would be nice to see the explanation in the
commit message (that the spinlock is only used to serialize probe()s).

Best Regards,
Michał Mirosław

[PATCH v3 14/16] usb: chipidea: tegra: Stop managing PHY's power

[Dmitry Osipenko]

Tegra's USB PHY driver now provides generic PHY init/shutdown callbacks
and thus the custom PHY management could be removed from Tegra-specific
part of the ChipIdea driver.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/usb/chipidea/ci_hdrc_tegra.c | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/drivers/usb/chipidea/ci_hdrc_tegra.c b/drivers/usb/chipidea/ci_hdrc_tegra.c
index 0c9911d44ee5..7455df0ede49 100644
--- a/drivers/usb/chipidea/ci_hdrc_tegra.c
+++ b/drivers/usb/chipidea/ci_hdrc_tegra.c
@@ -83,13 +83,6 @@ static int tegra_udc_probe(struct platform_device *pdev)
 		return err;
 	}
 
-	/*
-	 * Tegra's USB PHY driver doesn't implement optional phy_init()
-	 * hook, so we have to power on UDC controller before ChipIdea
-	 * driver initialization kicks in.
-	 */
-	usb_phy_set_suspend(udc->phy, 0);
-
 	/* setup and register ChipIdea HDRC device */
 	udc->data.name = "tegra-udc";
 	udc->data.flags = soc->flags;
@@ -109,7 +102,6 @@ static int tegra_udc_probe(struct platform_device *pdev)
 	return 0;
 
 fail_power_off:
-	usb_phy_set_suspend(udc->phy, 1);
 	clk_disable_unprepare(udc->clk);
 	return err;
 }
@@ -119,7 +111,6 @@ static int tegra_udc_remove(struct platform_device *pdev)
 	struct tegra_udc *udc = platform_get_drvdata(pdev);
 
 	ci_hdrc_remove_device(udc->dev);
-	usb_phy_set_suspend(udc->phy, 1);
 	clk_disable_unprepare(udc->clk);
 
 	return 0;
-- 
2.24.0

Re: [PATCH v3 14/16] usb: chipidea: tegra: Stop managing PHY's power

[Peter Chen]

On 19-12-28 23:33:56, Dmitry Osipenko wrote:
> Tegra's USB PHY driver now provides generic PHY init/shutdown callbacks
> and thus the custom PHY management could be removed from Tegra-specific
> part of the ChipIdea driver.
> 
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
> ---
>  drivers/usb/chipidea/ci_hdrc_tegra.c | 9 ---------
>  1 file changed, 9 deletions(-)
> 
> diff --git a/drivers/usb/chipidea/ci_hdrc_tegra.c b/drivers/usb/chipidea/ci_hdrc_tegra.c
> index 0c9911d44ee5..7455df0ede49 100644
> --- a/drivers/usb/chipidea/ci_hdrc_tegra.c
> +++ b/drivers/usb/chipidea/ci_hdrc_tegra.c
> @@ -83,13 +83,6 @@ static int tegra_udc_probe(struct platform_device *pdev)
>  		return err;
>  	}
>  
> -	/*
> -	 * Tegra's USB PHY driver doesn't implement optional phy_init()
> -	 * hook, so we have to power on UDC controller before ChipIdea
> -	 * driver initialization kicks in.
> -	 */
> -	usb_phy_set_suspend(udc->phy, 0);
> -
>  	/* setup and register ChipIdea HDRC device */
>  	udc->data.name = "tegra-udc";
>  	udc->data.flags = soc->flags;
> @@ -109,7 +102,6 @@ static int tegra_udc_probe(struct platform_device *pdev)
>  	return 0;
>  
>  fail_power_off:
> -	usb_phy_set_suspend(udc->phy, 1);
>  	clk_disable_unprepare(udc->clk);
>  	return err;
>  }
> @@ -119,7 +111,6 @@ static int tegra_udc_remove(struct platform_device *pdev)
>  	struct tegra_udc *udc = platform_get_drvdata(pdev);
>  
>  	ci_hdrc_remove_device(udc->dev);
> -	usb_phy_set_suspend(udc->phy, 1);
>  	clk_disable_unprepare(udc->clk);
>  
>  	return 0;
> -- 
> 2.24.0
> 

Acked-by: Peter Chen <peter.chen@nxp.com>

-- 

Thanks,
Peter Chen

[PATCH v3 15/16] usb: chipidea: tegra: Add USB_TEGRA_PHY to driver's dependencies

[Dmitry Osipenko]

Now, when ci_hdrc_tegra kernel module is loaded, the phy_tegra_usb module
is loaded too regardless of kernel's configuration. Previously this
problem was masked because Tegra's EHCI driver is usually enabled in
kernel's config and thus PHY driver was getting loaded because of it, but
now I was making some more thorough testing and noticed that PHY's module
isn't getting auto-loaded without the host driver.

Note that ChipIdea's driver doesn't use any of the exported functions of
phy_tegra_usb module and thus the module needs to be requested explicitly.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/usb/chipidea/Kconfig         | 1 +
 drivers/usb/chipidea/ci_hdrc_tegra.c | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/drivers/usb/chipidea/Kconfig b/drivers/usb/chipidea/Kconfig
index ae850b3fddf2..d53db520e209 100644
--- a/drivers/usb/chipidea/Kconfig
+++ b/drivers/usb/chipidea/Kconfig
@@ -7,6 +7,7 @@ config USB_CHIPIDEA
 	select RESET_CONTROLLER
 	select USB_ULPI_BUS
 	select USB_ROLE_SWITCH
+	select USB_TEGRA_PHY if ARCH_TEGRA
 	help
 	  Say Y here if your system has a dual role high speed USB
 	  controller based on ChipIdea silicon IP. It supports:
diff --git a/drivers/usb/chipidea/ci_hdrc_tegra.c b/drivers/usb/chipidea/ci_hdrc_tegra.c
index 7455df0ede49..8bc11100245d 100644
--- a/drivers/usb/chipidea/ci_hdrc_tegra.c
+++ b/drivers/usb/chipidea/ci_hdrc_tegra.c
@@ -53,6 +53,12 @@ static int tegra_udc_probe(struct platform_device *pdev)
 	struct tegra_udc *udc;
 	int err;
 
+	if (IS_MODULE(CONFIG_USB_TEGRA_PHY)) {
+		err = request_module("phy_tegra_usb");
+		if (err)
+			return err;
+	}
+
 	udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
 	if (!udc)
 		return -ENOMEM;
-- 
2.24.0

Re: [PATCH v3 15/16] usb: chipidea: tegra: Add USB_TEGRA_PHY to driver's dependencies

[Peter Chen]

On 19-12-28 23:33:57, Dmitry Osipenko wrote:
> Now, when ci_hdrc_tegra kernel module is loaded, the phy_tegra_usb module
> is loaded too regardless of kernel's configuration. Previously this
> problem was masked because Tegra's EHCI driver is usually enabled in
> kernel's config and thus PHY driver was getting loaded because of it, but
> now I was making some more thorough testing and noticed that PHY's module
> isn't getting auto-loaded without the host driver.
> 
> Note that ChipIdea's driver doesn't use any of the exported functions of
> phy_tegra_usb module and thus the module needs to be requested explicitly.
> 
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
> ---
>  drivers/usb/chipidea/Kconfig         | 1 +
>  drivers/usb/chipidea/ci_hdrc_tegra.c | 6 ++++++
>  2 files changed, 7 insertions(+)
> 
> diff --git a/drivers/usb/chipidea/Kconfig b/drivers/usb/chipidea/Kconfig
> index ae850b3fddf2..d53db520e209 100644
> --- a/drivers/usb/chipidea/Kconfig
> +++ b/drivers/usb/chipidea/Kconfig
> @@ -7,6 +7,7 @@ config USB_CHIPIDEA
>  	select RESET_CONTROLLER
>  	select USB_ULPI_BUS
>  	select USB_ROLE_SWITCH
> +	select USB_TEGRA_PHY if ARCH_TEGRA
>  	help
>  	  Say Y here if your system has a dual role high speed USB
>  	  controller based on ChipIdea silicon IP. It supports:
> diff --git a/drivers/usb/chipidea/ci_hdrc_tegra.c b/drivers/usb/chipidea/ci_hdrc_tegra.c
> index 7455df0ede49..8bc11100245d 100644
> --- a/drivers/usb/chipidea/ci_hdrc_tegra.c
> +++ b/drivers/usb/chipidea/ci_hdrc_tegra.c
> @@ -53,6 +53,12 @@ static int tegra_udc_probe(struct platform_device *pdev)
>  	struct tegra_udc *udc;
>  	int err;
>  
> +	if (IS_MODULE(CONFIG_USB_TEGRA_PHY)) {
> +		err = request_module("phy_tegra_usb");
> +		if (err)
> +			return err;
> +	}
> +
>  	udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
>  	if (!udc)
>  		return -ENOMEM;
> -- 
> 2.24.0
> 

Acked-by: Peter Chen <peter.chen@nxp.com>

-- 

Thanks,
Peter Chen

[PATCH v3 16/16] usb: host: ehci-tegra: Remove unused fields from tegra_ehci_hcd

[Dmitry Osipenko]

There are few stale fields in tegra_ehci_hcd structure, let's remove them.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/usb/host/ehci-tegra.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c
index 4d2cdec4cb78..eb82cdfffc3c 100644
--- a/drivers/usb/host/ehci-tegra.c
+++ b/drivers/usb/host/ehci-tegra.c
@@ -42,12 +42,10 @@ struct tegra_ehci_soc_config {
 };
 
 struct tegra_ehci_hcd {
-	struct tegra_usb_phy *phy;
 	struct clk *clk;
 	struct reset_control *rst;
 	int port_resuming;
 	bool needs_double_reset;
-	enum tegra_usb_phy_port_speed port_speed;
 };
 
 static int tegra_reset_usb_controller(struct platform_device *pdev)
-- 
2.24.0