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[PATCH 0/7] Exynos4412-based Trats2 USB gadget (DWC2) fixes

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  [PATCH 0/7] Exynos4412-based Trats2 USB gadget (DWC2) fixes Marek Szyprowski <m.szyprowski@samsung.com> - 2015-08-21 14:50 +0200
    [PATCH 4/7] usb: dwc2: remove double call to s3c_hsotg_of_probe Marek Szyprowski <m.szyprowski@samsung.com> - 2015-08-21 14:50 +0200
    [PATCH 7/7] usb: dwc2: refactor common low-level hw code to platform.c Marek Szyprowski <m.szyprowski@samsung.com> - 2015-08-21 14:50 +0200
      Re: [PATCH 7/7] usb: dwc2: refactor common low-level hw code to  platform.c John Youn <John.Youn@synopsys.com> - 2015-09-03 03:20 +0200
    [PATCH 3/7] regulators: max77693: register driver earlier to avoid  deferred probe Marek Szyprowski <m.szyprowski@samsung.com> - 2015-08-21 14:50 +0200
      Re: [PATCH 3/7] regulators: max77693: register driver earlier to  avoid deferred probe Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2015-08-23 06:00 +0200
    Re: [PATCH 0/7] Exynos4412-based Trats2 USB gadget (DWC2) fixes Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2015-08-24 09:20 +0200

#1211142 — [PATCH 0/7] Exynos4412-based Trats2 USB gadget (DWC2) fixes

Dear All,

Since v3.19 s3c-hsotg (DWC2) USB controller stopped working on
Exynos4412-based Trats2 platform. However on Odroid-U3 (which is also
Exynos4412-based) it worked fine all the time. After long investigation
it turned out that this was caused by 2 independent issues.

First issue was caused by patch 7eec1266751bd3a25e35ce88686634c768fedc24
("ARM: dts: Add Maxim 77693 PMIC to exynos4412-trats2") added support
for Maxim 77693 regulators, but without defining consumers for them.
This causes regulator core to disable them. However SAFEOUT1 regulator
provides power supply to VBUS signal, which also power some USB phy
related parts of Exynos SoC core. This has been fixed by patches 1-3,
which adds support for VBUS regulator, defines them in DTS for all
Exynos platforms and changes probe sequence of the drivers to ensure no
deferred probe occurs (USB gadget subsystem doesn't support deferred
probe yet).

Second issue is related to DWC2 driver rewrite and host/gadget/dual-role
integration code. DWC2 module on some platforms needs three additional
hardware resources: phy, clock and power supply. All of them must be
enabled/activated to properly initialize and operate. This was initially
handled in s3c-hsotg driver, which has been converted to 'gadget' part
of dwc2 driver. Unfortunately, not all of this code got moved to common
platform code, what resulted in accessing DWC2 registers without
enabling power supply regulators and clock. This caused initialization
failure on Exynos4412-based Trats2. Odroid U3 board worked fine, because
power supplies used by DWC2 module are marked there as 'always-on',
because they are also used by other modules (USB hub) and clock was
shared with USB2 PHY, so it was already enabled. This initialization
issue has been fixed by the last patch. While preparing it I've also
fixed a few minor issues found in nearby code (patches 4-6).

I would like to get those patches merged separately to respective
subsystem trees:
patch 1: phy subsystem tree
patch 2: Samsung Exynos tree
patch 3: regulator subsystem tree
patch 4-7: USB gadget subsystem tree

Patches have been prepared on top of linux-next from 20150821.

Best regards
Marek Szyprowski
Samsung R&D Institute Poland


Patch summary:

Marek Szyprowski (7):
  phy: exynos-usb2: add vbus regulator support
  arm: dts: exynos: add vbus regulator to USB2 phy nodes
  regulators: max77693: register driver earlier to avoid deferred probe
  usb: dwc2: remove double call to s3c_hsotg_of_probe
  usb: dwc2: remove non-functional clock gating
  usb: dwc2: fix unbalanced phy control
  usb: dwc2: refactor common low-level hw code to platform.c

 .../devicetree/bindings/phy/samsung-phy.txt        |   3 +
 arch/arm/boot/dts/exynos3250-monk.dts              |   1 +
 arch/arm/boot/dts/exynos3250-rinato.dts            |   1 +
 arch/arm/boot/dts/exynos4210-trats.dts             |   2 +-
 arch/arm/boot/dts/exynos4210-universal_c210.dts    |   2 +-
 arch/arm/boot/dts/exynos4412-trats2.dts            |   1 +
 drivers/phy/phy-samsung-usb2.c                     |  25 ++-
 drivers/phy/phy-samsung-usb2.h                     |   2 +
 drivers/regulator/max77693.c                       |  12 +-
 drivers/usb/dwc2/core.h                            |   4 +-
 drivers/usb/dwc2/gadget.c                          | 196 +++----------------
 drivers/usb/dwc2/platform.c                        | 209 +++++++++++++++++----
 12 files changed, 239 insertions(+), 219 deletions(-)

-- 
1.9.2

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#1211143 — [PATCH 4/7] usb: dwc2: remove double call to s3c_hsotg_of_probe

This patch removes doubled call to s3c_hsotg_of_probe() function.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
 drivers/usb/dwc2/gadget.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index 3ee5b4c77a1f..47960787f572 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -3488,8 +3488,6 @@ int dwc2_gadget_init(struct dwc2_hsotg *hsotg, int irq)
 	/* Set default UTMI width */
 	hsotg->phyif = GUSBCFG_PHYIF16;
 
-	s3c_hsotg_of_probe(hsotg);
-
 	/* Initialize to legacy fifo configuration values */
 	hsotg->g_rx_fifo_sz = 2048;
 	hsotg->g_np_g_tx_fifo_sz = 1024;
-- 
1.9.2

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#1211145 — [PATCH 7/7] usb: dwc2: refactor common low-level hw code to platform.c

DWC2 module on some platforms needs three additional hardware
resources: phy controller, clock and power supply. All of them must be
enabled/activated to properly initialize and operate. This was initially
handled in s3c-hsotg driver, which has been converted to 'gadget' part
of dwc2 driver. Unfortunately, not all of this code got moved to common
platform code, what resulted in accessing DWC2 registers without
enabling low-level hardware resources. This fails for example on Exynos
SoCs. This patch moves all the code for managing those resources to
common platform.c file and provides convenient wrappers for controlling
them.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
 drivers/usb/dwc2/core.h     |   4 +-
 drivers/usb/dwc2/gadget.c   | 188 +++++-----------------------------------
 drivers/usb/dwc2/platform.c | 207 ++++++++++++++++++++++++++++++++++++--------
 3 files changed, 195 insertions(+), 204 deletions(-)

diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
index 0ed87620941b..ec820bdf98c0 100644
--- a/drivers/usb/dwc2/core.h
+++ b/drivers/usb/dwc2/core.h
@@ -690,6 +690,7 @@ struct dwc2_hsotg {
 	enum usb_dr_mode dr_mode;
 	unsigned int hcd_enabled:1;
 	unsigned int gadget_enabled:1;
+	unsigned int ll_hw_enabled:1;
 
 	struct phy *phy;
 	struct usb_phy *uphy;
@@ -1088,7 +1089,8 @@ extern void dwc2_set_all_params(struct dwc2_core_params *params, int value);
 
 extern int dwc2_get_hwparams(struct dwc2_hsotg *hsotg);
 
-
+extern int dwc2_lowlevel_hw_enable(struct dwc2_hsotg *hsotg);
+extern int dwc2_lowlevel_hw_disable(struct dwc2_hsotg *hsotg);
 
 /*
  * Dump core registers and SPRAM
diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index bccb60fcdd70..98f139be8c7f 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -25,15 +25,11 @@
 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/slab.h>
-#include <linux/clk.h>
-#include <linux/regulator/consumer.h>
 #include <linux/of_platform.h>
-#include <linux/phy/phy.h>
 
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
 #include <linux/usb/phy.h>
-#include <linux/platform_data/s3c-hsotg.h>
 
 #include "core.h"
 #include "hw.h"
@@ -2944,50 +2940,6 @@ static struct usb_ep_ops s3c_hsotg_ep_ops = {
 };
 
 /**
- * s3c_hsotg_phy_enable - enable platform phy dev
- * @hsotg: The driver state
- *
- * A wrapper for platform code responsible for controlling
- * low-level USB code
- */
-static void s3c_hsotg_phy_enable(struct dwc2_hsotg *hsotg)
-{
-	struct platform_device *pdev = to_platform_device(hsotg->dev);
-
-	dev_dbg(hsotg->dev, "pdev 0x%p\n", pdev);
-
-	if (hsotg->uphy)
-		usb_phy_init(hsotg->uphy);
-	else if (hsotg->plat && hsotg->plat->phy_init)
-		hsotg->plat->phy_init(pdev, hsotg->plat->phy_type);
-	else {
-		phy_init(hsotg->phy);
-		phy_power_on(hsotg->phy);
-	}
-}
-
-/**
- * s3c_hsotg_phy_disable - disable platform phy dev
- * @hsotg: The driver state
- *
- * A wrapper for platform code responsible for controlling
- * low-level USB code
- */
-static void s3c_hsotg_phy_disable(struct dwc2_hsotg *hsotg)
-{
-	struct platform_device *pdev = to_platform_device(hsotg->dev);
-
-	if (hsotg->uphy)
-		usb_phy_shutdown(hsotg->uphy);
-	else if (hsotg->plat && hsotg->plat->phy_exit)
-		hsotg->plat->phy_exit(pdev, hsotg->plat->phy_type);
-	else {
-		phy_power_off(hsotg->phy);
-		phy_exit(hsotg->phy);
-	}
-}
-
-/**
  * s3c_hsotg_init - initalize the usb core
  * @hsotg: The driver state
  */
@@ -3068,14 +3020,13 @@ static int s3c_hsotg_udc_start(struct usb_gadget *gadget,
 	hsotg->gadget.dev.of_node = hsotg->dev->of_node;
 	hsotg->gadget.speed = USB_SPEED_UNKNOWN;
 
-	ret = regulator_bulk_enable(ARRAY_SIZE(hsotg->supplies),
-				    hsotg->supplies);
-	if (ret) {
-		dev_err(hsotg->dev, "failed to enable supplies: %d\n", ret);
-		goto err;
+	if (hsotg->dr_mode == USB_DR_MODE_PERIPHERAL) {
+		ret = dwc2_lowlevel_hw_enable(hsotg);
+		if (ret)
+			goto err;
+		hsotg->ll_hw_enabled = true;
 	}
 
-	s3c_hsotg_phy_enable(hsotg);
 	if (!IS_ERR_OR_NULL(hsotg->uphy))
 		otg_set_peripheral(hsotg->uphy->otg, &hsotg->gadget);
 
@@ -3133,9 +3084,11 @@ static int s3c_hsotg_udc_stop(struct usb_gadget *gadget)
 
 	if (!IS_ERR_OR_NULL(hsotg->uphy))
 		otg_set_peripheral(hsotg->uphy->otg, NULL);
-	s3c_hsotg_phy_disable(hsotg);
 
-	regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies), hsotg->supplies);
+	if (hsotg->dr_mode == USB_DR_MODE_PERIPHERAL) {
+		dwc2_lowlevel_hw_disable(hsotg);
+		hsotg->ll_hw_enabled = false;
+	}
 
 	mutex_unlock(&hsotg->init_mutex);
 
@@ -3473,7 +3426,6 @@ static inline void s3c_hsotg_of_probe(struct dwc2_hsotg *hsotg) { }
 int dwc2_gadget_init(struct dwc2_hsotg *hsotg, int irq)
 {
 	struct device *dev = hsotg->dev;
-	struct s3c_hsotg_plat *plat = dev->platform_data;
 	int epnum;
 	int ret;
 	int i;
@@ -3495,19 +3447,8 @@ int dwc2_gadget_init(struct dwc2_hsotg *hsotg, int irq)
 	for (i = 0; i < MAX_EPS_CHANNELS; i++)
 		dev_dbg(dev, "Periodic TXFIFO%2d size: %d\n", i,
 						hsotg->g_tx_fifo_sz[i]);
-	/*
-	 * If platform probe couldn't find a generic PHY or an old style
-	 * USB PHY, fall back to pdata
-	 */
-	if (IS_ERR_OR_NULL(hsotg->phy) && IS_ERR_OR_NULL(hsotg->uphy)) {
-		plat = dev_get_platdata(dev);
-		if (!plat) {
-			dev_err(dev,
-			"no platform data or transceiver defined\n");
-			return -EPROBE_DEFER;
-		}
-		hsotg->plat = plat;
-	} else if (hsotg->phy) {
+
+	if (hsotg->phy) {
 		/*
 		 * If using the generic PHY framework, check if the PHY bus
 		 * width is 8-bit and set the phyif appropriately.
@@ -3516,50 +3457,12 @@ int dwc2_gadget_init(struct dwc2_hsotg *hsotg, int irq)
 			hsotg->phyif = GUSBCFG_PHYIF8;
 	}
 
-	hsotg->clk = devm_clk_get(dev, "otg");
-	if (IS_ERR(hsotg->clk)) {
-		hsotg->clk = NULL;
-		dev_dbg(dev, "cannot get otg clock\n");
-	}
-
 	hsotg->gadget.max_speed = USB_SPEED_HIGH;
 	hsotg->gadget.ops = &s3c_hsotg_gadget_ops;
 	hsotg->gadget.name = dev_name(dev);
 	if (hsotg->dr_mode == USB_DR_MODE_OTG)
 		hsotg->gadget.is_otg = 1;
 
-	/* reset the system */
-
-	ret = clk_prepare_enable(hsotg->clk);
-	if (ret) {
-		dev_err(dev, "failed to enable otg clk\n");
-		goto err_clk;
-	}
-
-
-	/* regulators */
-
-	for (i = 0; i < ARRAY_SIZE(hsotg->supplies); i++)
-		hsotg->supplies[i].supply = s3c_hsotg_supply_names[i];
-
-	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(hsotg->supplies),
-				 hsotg->supplies);
-	if (ret) {
-		dev_err(dev, "failed to request supplies: %d\n", ret);
-		goto err_clk;
-	}
-
-	ret = regulator_bulk_enable(ARRAY_SIZE(hsotg->supplies),
-				    hsotg->supplies);
-
-	if (ret) {
-		dev_err(dev, "failed to enable supplies: %d\n", ret);
-		goto err_clk;
-	}
-
-	/* usb phy enable */
-	s3c_hsotg_phy_enable(hsotg);
-
 	/*
 	 * Force Device mode before initialization.
 	 * This allows correctly configuring fifo for device mode.
@@ -3577,7 +3480,7 @@ int dwc2_gadget_init(struct dwc2_hsotg *hsotg, int irq)
 	ret = s3c_hsotg_hw_cfg(hsotg);
 	if (ret) {
 		dev_err(hsotg->dev, "Hardware configuration failed: %d\n", ret);
-		goto err_clk;
+		return ret;
 	}
 
 	s3c_hsotg_init(hsotg);
@@ -3589,35 +3492,28 @@ int dwc2_gadget_init(struct dwc2_hsotg *hsotg, int irq)
 			DWC2_CTRL_BUFF_SIZE, GFP_KERNEL);
 	if (!hsotg->ctrl_buff) {
 		dev_err(dev, "failed to allocate ctrl request buff\n");
-		ret = -ENOMEM;
-		goto err_supplies;
+		return -ENOMEM;
 	}
 
 	hsotg->ep0_buff = devm_kzalloc(hsotg->dev,
 			DWC2_CTRL_BUFF_SIZE, GFP_KERNEL);
 	if (!hsotg->ep0_buff) {
 		dev_err(dev, "failed to allocate ctrl reply buff\n");
-		ret = -ENOMEM;
-		goto err_supplies;
+		return -ENOMEM;
 	}
 
 	ret = devm_request_irq(hsotg->dev, irq, s3c_hsotg_irq, IRQF_SHARED,
 				dev_name(hsotg->dev), hsotg);
 	if (ret < 0) {
-		s3c_hsotg_phy_disable(hsotg);
-		clk_disable_unprepare(hsotg->clk);
-		regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies),
-				       hsotg->supplies);
 		dev_err(dev, "cannot claim IRQ for gadget\n");
-		goto err_supplies;
+		return ret;
 	}
 
 	/* hsotg->num_of_eps holds number of EPs other than ep0 */
 
 	if (hsotg->num_of_eps == 0) {
 		dev_err(dev, "wrong number of EPs (zero)\n");
-		ret = -EINVAL;
-		goto err_supplies;
+		return -EINVAL;
 	}
 
 	/* setup endpoint information */
@@ -3631,8 +3527,7 @@ int dwc2_gadget_init(struct dwc2_hsotg *hsotg, int irq)
 						     GFP_KERNEL);
 	if (!hsotg->ctrl_req) {
 		dev_err(dev, "failed to allocate ctrl req\n");
-		ret = -ENOMEM;
-		goto err_supplies;
+		return -ENOMEM;
 	}
 
 	/* initialise the endpoints now the core has been initialised */
@@ -3645,30 +3540,13 @@ int dwc2_gadget_init(struct dwc2_hsotg *hsotg, int irq)
 								epnum, 0);
 	}
 
-	/* disable power and clock */
-	s3c_hsotg_phy_disable(hsotg);
-
-	ret = regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies),
-				    hsotg->supplies);
-	if (ret) {
-		dev_err(dev, "failed to disable supplies: %d\n", ret);
-		goto err_supplies;
-	}
-
 	ret = usb_add_gadget_udc(dev, &hsotg->gadget);
 	if (ret)
-		goto err_supplies;
+		return ret;
 
 	s3c_hsotg_dump(hsotg);
 
 	return 0;
-
-err_supplies:
-	s3c_hsotg_phy_disable(hsotg);
-err_clk:
-	clk_disable_unprepare(hsotg->clk);
-
-	return ret;
 }
 
 /**
@@ -3678,7 +3556,6 @@ err_clk:
 int s3c_hsotg_remove(struct dwc2_hsotg *hsotg)
 {
 	usb_del_gadget_udc(&hsotg->gadget);
-	clk_disable_unprepare(hsotg->clk);
 
 	return 0;
 }
@@ -3686,12 +3563,9 @@ int s3c_hsotg_remove(struct dwc2_hsotg *hsotg)
 int s3c_hsotg_suspend(struct dwc2_hsotg *hsotg)
 {
 	unsigned long flags;
-	int ret = 0;
 
 	if (hsotg->lx_state != DWC2_L0)
-		return ret;
-
-	mutex_lock(&hsotg->init_mutex);
+		return 0;
 
 	if (hsotg->driver) {
 		int ep;
@@ -3706,52 +3580,34 @@ int s3c_hsotg_suspend(struct dwc2_hsotg *hsotg)
 		hsotg->gadget.speed = USB_SPEED_UNKNOWN;
 		spin_unlock_irqrestore(&hsotg->lock, flags);
 
-		s3c_hsotg_phy_disable(hsotg);
-
 		for (ep = 0; ep < hsotg->num_of_eps; ep++) {
 			if (hsotg->eps_in[ep])
 				s3c_hsotg_ep_disable(&hsotg->eps_in[ep]->ep);
 			if (hsotg->eps_out[ep])
 				s3c_hsotg_ep_disable(&hsotg->eps_out[ep]->ep);
 		}
-
-		ret = regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies),
-					     hsotg->supplies);
-		clk_disable(hsotg->clk);
 	}
 
-	mutex_unlock(&hsotg->init_mutex);
-
-	return ret;
+	return 0;
 }
 
 int s3c_hsotg_resume(struct dwc2_hsotg *hsotg)
 {
 	unsigned long flags;
-	int ret = 0;
 
 	if (hsotg->lx_state == DWC2_L2)
-		return ret;
-
-	mutex_lock(&hsotg->init_mutex);
+		return 0;
 
 	if (hsotg->driver) {
 		dev_info(hsotg->dev, "resuming usb gadget %s\n",
 			 hsotg->driver->driver.name);
 
-		clk_enable(hsotg->clk);
-		ret = regulator_bulk_enable(ARRAY_SIZE(hsotg->supplies),
-					    hsotg->supplies);
-
-		s3c_hsotg_phy_enable(hsotg);
-
 		spin_lock_irqsave(&hsotg->lock, flags);
 		s3c_hsotg_core_init_disconnected(hsotg, false);
 		if (hsotg->enabled)
 			s3c_hsotg_core_connect(hsotg);
 		spin_unlock_irqrestore(&hsotg->lock, flags);
 	}
-	mutex_unlock(&hsotg->init_mutex);
 
-	return ret;
+	return 0;
 }
diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
index dad15ad1ecb4..2e55481e030c 100644
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -37,11 +37,14 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/slab.h>
+#include <linux/clk.h>
 #include <linux/device.h>
 #include <linux/dma-mapping.h>
 #include <linux/of_device.h>
 #include <linux/mutex.h>
 #include <linux/platform_device.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_data/s3c-hsotg.h>
 
 #include <linux/usb/of.h>
 
@@ -112,6 +115,114 @@ static const struct dwc2_core_params params_rk3066 = {
 };
 
 /**
+ * dwc2_lowlevel_hw_enable - enable platform lowlevel hw resources
+ * @hsotg: The driver state
+ *
+ * A wrapper for platform code responsible for controlling
+ * low-level USB platform resources (phy, clock, regulators)
+ */
+int dwc2_lowlevel_hw_enable(struct dwc2_hsotg *hsotg)
+{
+	struct platform_device *pdev = to_platform_device(hsotg->dev);
+	int ret;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(hsotg->supplies),
+				    hsotg->supplies);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(hsotg->clk);
+	if (ret)
+		return ret;
+
+	if (hsotg->uphy)
+		ret = usb_phy_init(hsotg->uphy);
+	else if (hsotg->plat && hsotg->plat->phy_init)
+		ret = hsotg->plat->phy_init(pdev, hsotg->plat->phy_type);
+	else {
+		ret = phy_power_on(hsotg->phy);
+		if (ret == 0)
+			ret = phy_init(hsotg->phy);
+	}
+	return ret;
+}
+
+/**
+ * dwc2_lowlevel_hw_enable - disable platform lowlevel hw resources
+ * @hsotg: The driver state
+ *
+ * A wrapper for platform code responsible for controlling
+ * low-level USB platform resources (phy, clock, regulators)
+ */
+int dwc2_lowlevel_hw_disable(struct dwc2_hsotg *hsotg)
+{
+	struct platform_device *pdev = to_platform_device(hsotg->dev);
+	int ret = 0;
+
+	if (hsotg->uphy)
+		usb_phy_shutdown(hsotg->uphy);
+	else if (hsotg->plat && hsotg->plat->phy_exit)
+		ret = hsotg->plat->phy_exit(pdev, hsotg->plat->phy_type);
+	else {
+		ret = phy_exit(hsotg->phy);
+		if (ret == 0)
+			ret = phy_power_off(hsotg->phy);
+	}
+	if (ret)
+		return ret;
+
+	clk_disable_unprepare(hsotg->clk);
+
+	ret = regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies),
+				     hsotg->supplies);
+
+	return ret;
+}
+
+static int dwc2_lowlevel_hw_init(struct dwc2_hsotg *hsotg)
+{
+	int i, ret;
+	/*
+	 * Attempt to find a generic PHY, then look for an old style
+	 * USB PHY and then fall back to pdata
+	 */
+	hsotg->phy = devm_phy_get(hsotg->dev, "usb2-phy");
+	if (IS_ERR(hsotg->phy)) {
+		hsotg->phy = NULL;
+		hsotg->uphy = devm_usb_get_phy(hsotg->dev, USB_PHY_TYPE_USB2);
+		if (IS_ERR(hsotg->uphy))
+			hsotg->uphy = NULL;
+		else
+			hsotg->plat = dev_get_platdata(hsotg->dev);
+	}
+
+	if (!hsotg->phy && !hsotg->uphy && !hsotg->plat) {
+		dev_err(hsotg->dev, "no platform data or transceiver defined\n");
+		return -EPROBE_DEFER;
+	}
+
+	/* Clock */
+	hsotg->clk = devm_clk_get(hsotg->dev, "otg");
+	if (IS_ERR(hsotg->clk)) {
+		hsotg->clk = NULL;
+		dev_dbg(hsotg->dev, "cannot get otg clock\n");
+	}
+
+	/* Regulators */
+	for (i = 0; i < ARRAY_SIZE(hsotg->supplies); i++)
+		hsotg->supplies[i].supply = s3c_hsotg_supply_names[i];
+
+	ret = devm_regulator_bulk_get(hsotg->dev, ARRAY_SIZE(hsotg->supplies),
+				      hsotg->supplies);
+	if (ret) {
+		dev_err(hsotg->dev, "failed to request supplies: %d\n", ret);
+		return ret;
+	}
+	return 0;
+}
+
+
+/**
  * dwc2_driver_remove() - Called when the DWC_otg core is unregistered with the
  * DWC_otg driver
  *
@@ -126,12 +237,19 @@ static int dwc2_driver_remove(struct platform_device *dev)
 {
 	struct dwc2_hsotg *hsotg = platform_get_drvdata(dev);
 
+	mutex_lock(&hsotg->init_mutex);
+
 	dwc2_debugfs_exit(hsotg);
 	if (hsotg->hcd_enabled)
 		dwc2_hcd_remove(hsotg);
 	if (hsotg->gadget_enabled)
 		s3c_hsotg_remove(hsotg);
 
+	if (hsotg->ll_hw_enabled)
+		dwc2_lowlevel_hw_disable(hsotg);
+
+	mutex_unlock(&hsotg->init_mutex);
+
 	return 0;
 }
 
@@ -163,8 +281,6 @@ static int dwc2_driver_probe(struct platform_device *dev)
 	struct dwc2_core_params defparams;
 	struct dwc2_hsotg *hsotg;
 	struct resource *res;
-	struct phy *phy;
-	struct usb_phy *uphy;
 	int retval;
 	int irq;
 
@@ -222,32 +338,13 @@ static int dwc2_driver_probe(struct platform_device *dev)
 
 	hsotg->dr_mode = of_usb_get_dr_mode(dev->dev.of_node);
 
-	/*
-	 * Attempt to find a generic PHY, then look for an old style
-	 * USB PHY
-	 */
-	phy = devm_phy_get(&dev->dev, "usb2-phy");
-	if (IS_ERR(phy)) {
-		hsotg->phy = NULL;
-		uphy = devm_usb_get_phy(&dev->dev, USB_PHY_TYPE_USB2);
-		if (IS_ERR(uphy))
-			hsotg->uphy = NULL;
-		else
-			hsotg->uphy = uphy;
-	} else {
-		hsotg->phy = phy;
-		phy_power_on(hsotg->phy);
-		phy_init(hsotg->phy);
-	}
+	retval = dwc2_lowlevel_hw_init(hsotg);
+	if (retval)
+		return retval;
 
 	spin_lock_init(&hsotg->lock);
 	mutex_init(&hsotg->init_mutex);
 
-	/* Detect config values from hardware */
-	retval = dwc2_get_hwparams(hsotg);
-	if (retval)
-		return retval;
-
 	hsotg->core_params = devm_kzalloc(&dev->dev,
 				sizeof(*hsotg->core_params), GFP_KERNEL);
 	if (!hsotg->core_params)
@@ -255,13 +352,25 @@ static int dwc2_driver_probe(struct platform_device *dev)
 
 	dwc2_set_all_params(hsotg->core_params, -1);
 
+	retval = dwc2_lowlevel_hw_enable(hsotg);
+	if (retval)
+		return retval;
+	hsotg->ll_hw_enabled = true;
+
+	/* Detect config values from hardware */
+	retval = dwc2_get_hwparams(hsotg);
+	if (retval)
+		goto error;
+
 	/* Validate parameter values */
 	dwc2_set_parameters(hsotg, params);
 
+	mutex_lock(&hsotg->init_mutex);
+
 	if (hsotg->dr_mode != USB_DR_MODE_HOST) {
 		retval = dwc2_gadget_init(hsotg, irq);
 		if (retval)
-			return retval;
+			goto err_unlock;
 		hsotg->gadget_enabled = 1;
 	}
 
@@ -270,7 +379,7 @@ static int dwc2_driver_probe(struct platform_device *dev)
 		if (retval) {
 			if (hsotg->gadget_enabled)
 				s3c_hsotg_remove(hsotg);
-			return retval;
+			goto err_unlock;
 		}
 		hsotg->hcd_enabled = 1;
 	}
@@ -279,6 +388,21 @@ static int dwc2_driver_probe(struct platform_device *dev)
 
 	dwc2_debugfs_init(hsotg);
 
+	/* Gadget code manages lowlevel hw on its own */
+	if (hsotg->dr_mode == USB_DR_MODE_PERIPHERAL) {
+		dwc2_lowlevel_hw_disable(hsotg);
+		hsotg->ll_hw_enabled = false;
+	}
+
+	mutex_unlock(&hsotg->init_mutex);
+
+	return 0;
+
+err_unlock:
+	mutex_unlock(&hsotg->init_mutex);
+error:
+	dwc2_lowlevel_hw_disable(hsotg);
+	hsotg->ll_hw_enabled = false;
 	return retval;
 }
 
@@ -287,13 +411,16 @@ static int __maybe_unused dwc2_suspend(struct device *dev)
 	struct dwc2_hsotg *dwc2 = dev_get_drvdata(dev);
 	int ret = 0;
 
-	if (dwc2_is_device_mode(dwc2)) {
-		ret = s3c_hsotg_suspend(dwc2);
-	} else {
-		phy_exit(dwc2->phy);
-		phy_power_off(dwc2->phy);
+	mutex_lock(&dwc2->init_mutex);
+
+	if (dwc2_is_device_mode(dwc2))
+		s3c_hsotg_suspend(dwc2);
+
+	if (dwc2->ll_hw_enabled)
+		ret = dwc2_lowlevel_hw_disable(dwc2);
+
+	mutex_unlock(&dwc2->init_mutex);
 
-	}
 	return ret;
 }
 
@@ -302,13 +429,19 @@ static int __maybe_unused dwc2_resume(struct device *dev)
 	struct dwc2_hsotg *dwc2 = dev_get_drvdata(dev);
 	int ret = 0;
 
-	if (dwc2_is_device_mode(dwc2)) {
-		ret = s3c_hsotg_resume(dwc2);
-	} else {
-		phy_power_on(dwc2->phy);
-		phy_init(dwc2->phy);
+	mutex_lock(&dwc2->init_mutex);
 
+	if (dwc2->ll_hw_enabled) {
+		ret = dwc2_lowlevel_hw_enable(dwc2);
+		if (ret)
+			goto err;
 	}
+
+	if (dwc2_is_device_mode(dwc2))
+		ret = s3c_hsotg_resume(dwc2);
+err:
+	mutex_unlock(&dwc2->init_mutex);
+
 	return ret;
 }
 
-- 
1.9.2

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#1217992 — Re: [PATCH 7/7] usb: dwc2: refactor common low-level hw code to platform.c

On 8/21/2015 5:39 AM, Marek Szyprowski wrote:
> DWC2 module on some platforms needs three additional hardware
> resources: phy controller, clock and power supply. All of them must be
> enabled/activated to properly initialize and operate. This was initially
> handled in s3c-hsotg driver, which has been converted to 'gadget' part
> of dwc2 driver. Unfortunately, not all of this code got moved to common
> platform code, what resulted in accessing DWC2 registers without
> enabling low-level hardware resources. This fails for example on Exynos
> SoCs. This patch moves all the code for managing those resources to
> common platform.c file and provides convenient wrappers for controlling
> them.
> 
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---
>  drivers/usb/dwc2/core.h     |   4 +-
>  drivers/usb/dwc2/gadget.c   | 188 +++++-----------------------------------
>  drivers/usb/dwc2/platform.c | 207 ++++++++++++++++++++++++++++++++++++--------
>  3 files changed, 195 insertions(+), 204 deletions(-)
> 
> diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
> index 0ed87620941b..ec820bdf98c0 100644
> --- a/drivers/usb/dwc2/core.h
> +++ b/drivers/usb/dwc2/core.h
> @@ -690,6 +690,7 @@ struct dwc2_hsotg {
>  	enum usb_dr_mode dr_mode;
>  	unsigned int hcd_enabled:1;
>  	unsigned int gadget_enabled:1;
> +	unsigned int ll_hw_enabled:1;

It seems like this flag is used to restore the state of the
lowlevel_hw on suspend/resume?

I think it is clearer to put the setting/clearing of the flag
inside the ll_hw_enable/disable and then check and adjust on
suspend/resume. That way you don't have to manage this flag
everywhere you call enable/disable().

John



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#1211147 — [PATCH 3/7] regulators: max77693: register driver earlier to avoid deferred probe

MAX77693 based regulators are used by USB gadget subsystem, which
doesn't support deferred probe, so the driver should be registered
before USB gadget drivers get probed.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
 drivers/regulator/max77693.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/regulator/max77693.c b/drivers/regulator/max77693.c
index 788379b87962..de730fd3f8a5 100644
--- a/drivers/regulator/max77693.c
+++ b/drivers/regulator/max77693.c
@@ -300,7 +300,17 @@ static struct platform_driver max77693_pmic_driver = {
 	.id_table = max77693_pmic_id,
 };
 
-module_platform_driver(max77693_pmic_driver);
+static int __init max77693_pmic_init(void)
+{
+	return platform_driver_register(&max77693_pmic_driver);
+}
+subsys_initcall(max77693_pmic_init);
+
+static void __exit max77693_pmic_cleanup(void)
+{
+	platform_driver_unregister(&max77693_pmic_driver);
+}
+module_exit(max77693_pmic_cleanup);
 
 MODULE_DESCRIPTION("MAXIM 77693/77843 regulator driver");
 MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
-- 
1.9.2

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#1211555 — Re: [PATCH 3/7] regulators: max77693: register driver earlier to avoid deferred probe

W dniu 21.08.2015 o 21:38, Marek Szyprowski pisze:
> MAX77693 based regulators are used by USB gadget subsystem, which
> doesn't support deferred probe, so the driver should be registered
> before USB gadget drivers get probed.
> 
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---
>  drivers/regulator/max77693.c | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
> 

Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>

Best regards,
Krzysztof

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#1211845

On 21.08.2015 21:38, Marek Szyprowski wrote:
> Dear All,
> 
> Since v3.19 s3c-hsotg (DWC2) USB controller stopped working on
> Exynos4412-based Trats2 platform. However on Odroid-U3 (which is also
> Exynos4412-based) it worked fine all the time. After long investigation
> it turned out that this was caused by 2 independent issues.
> 
> First issue was caused by patch 7eec1266751bd3a25e35ce88686634c768fedc24
> ("ARM: dts: Add Maxim 77693 PMIC to exynos4412-trats2") added support
> for Maxim 77693 regulators, but without defining consumers for them.
> This causes regulator core to disable them. However SAFEOUT1 regulator
> provides power supply to VBUS signal, which also power some USB phy
> related parts of Exynos SoC core. This has been fixed by patches 1-3,
> which adds support for VBUS regulator, defines them in DTS for all
> Exynos platforms and changes probe sequence of the drivers to ensure no
> deferred probe occurs (USB gadget subsystem doesn't support deferred
> probe yet).
> 
> Second issue is related to DWC2 driver rewrite and host/gadget/dual-role
> integration code. DWC2 module on some platforms needs three additional
> hardware resources: phy, clock and power supply. All of them must be
> enabled/activated to properly initialize and operate. This was initially
> handled in s3c-hsotg driver, which has been converted to 'gadget' part
> of dwc2 driver. Unfortunately, not all of this code got moved to common
> platform code, what resulted in accessing DWC2 registers without
> enabling power supply regulators and clock. This caused initialization
> failure on Exynos4412-based Trats2. Odroid U3 board worked fine, because
> power supplies used by DWC2 module are marked there as 'always-on',
> because they are also used by other modules (USB hub) and clock was
> shared with USB2 PHY, so it was already enabled. This initialization
> issue has been fixed by the last patch. While preparing it I've also
> fixed a few minor issues found in nearby code (patches 4-6).
> 
> I would like to get those patches merged separately to respective
> subsystem trees:
> patch 1: phy subsystem tree
> patch 2: Samsung Exynos tree
> patch 3: regulator subsystem tree
> patch 4-7: USB gadget subsystem tree
> 
> Patches have been prepared on top of linux-next from 20150821.

Entire patchset tested on Trats2 board:
Tested-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>

Best regards,
Krzysztof

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