The chipidea changes for v4.5-rc1

- Delete static debug for chipidea driver.
 - Suspend USB core when A device tries to switch to peripheral mode,
   at former design, it just stopped SoF simply but USB core doesn't know it.
 - Several small changes.
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Merge tag 'usb-ci-v4.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/peter.chen/usb into usb-testing

Peter writes:

The chipidea changes for v4.5-rc1

- Delete static debug for chipidea driver.
- Suspend USB core when A device tries to switch to peripheral mode,
  at former design, it just stopped SoF simply but USB core doesn't know it.
- Several small changes.

Documentation/usb/chipidea.txt

@@ -7,8 +7,8 @@ with 2 Freescale i.MX6Q sabre SD boards.
 ---------------------------------------
 Select CONFIG_USB_OTG_FSM, rebuild kernel Image and modules.
 If you want to check some internal variables for otg fsm,
-select CONFIG_USB_CHIPIDEA_DEBUG, there are 2 files which
-can show otg fsm variables and some controller registers value:
+mount debugfs, there are 2 files which can show otg fsm
+variables and some controller registers value:
 cat /sys/kernel/debug/ci_hdrc.0/otg
 cat /sys/kernel/debug/ci_hdrc.0/registers
 

drivers/usb/chipidea/Kconfig

@@ -37,9 +37,4 @@ config USB_CHIPIDEA_HOST
 	  Say Y here to enable host controller functionality of the
 	  ChipIdea driver.
 
-config USB_CHIPIDEA_DEBUG
-	bool "ChipIdea driver debug"
-	help
-	  Say Y here to enable debugging output of the ChipIdea driver.
-
 endif

drivers/usb/chipidea/Makefile

@@ -1,11 +1,8 @@
-ccflags-$(CONFIG_USB_CHIPIDEA_DEBUG) := -DDEBUG
-
 obj-$(CONFIG_USB_CHIPIDEA)		+= ci_hdrc.o
 
-ci_hdrc-y				:= core.o otg.o
+ci_hdrc-y				:= core.o otg.o debug.o
 ci_hdrc-$(CONFIG_USB_CHIPIDEA_UDC)	+= udc.o
 ci_hdrc-$(CONFIG_USB_CHIPIDEA_HOST)	+= host.o
-ci_hdrc-$(CONFIG_USB_CHIPIDEA_DEBUG)	+= debug.o
 ci_hdrc-$(CONFIG_USB_OTG_FSM)		+= otg_fsm.o
 
 # Glue/Bridge layers go here

drivers/usb/chipidea/ci.h

@@ -433,4 +433,7 @@ int hw_wait_reg(struct ci_hdrc *ci, enum ci_hw_regs reg, u32 mask,
 
 void ci_platform_configure(struct ci_hdrc *ci);
 
+int dbg_create_files(struct ci_hdrc *ci);
+
+void dbg_remove_files(struct ci_hdrc *ci);
 #endif	/* __DRIVERS_USB_CHIPIDEA_CI_H */

drivers/usb/chipidea/ci_hdrc_imx.c

@@ -345,6 +345,11 @@ static int ci_hdrc_imx_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static void ci_hdrc_imx_shutdown(struct platform_device *pdev)
+{
+	ci_hdrc_imx_remove(pdev);
+}
+
 #ifdef CONFIG_PM
 static int imx_controller_suspend(struct device *dev)
 {
@@ -462,6 +467,7 @@ static const struct dev_pm_ops ci_hdrc_imx_pm_ops = {
 static struct platform_driver ci_hdrc_imx_driver = {
 	.probe = ci_hdrc_imx_probe,
 	.remove = ci_hdrc_imx_remove,
+	.shutdown = ci_hdrc_imx_shutdown,
 	.driver = {
 		.name = "imx_usb",
 		.of_match_table = ci_hdrc_imx_dt_ids,

drivers/usb/chipidea/core.c

@@ -23,7 +23,6 @@
  * - BUS:    bus glue code, bus abstraction layer
  *
  * Compile Options
- * - CONFIG_USB_CHIPIDEA_DEBUG: enable debug facilities
  * - STALL_IN:  non-empty bulk-in pipes cannot be halted
  *              if defined mass storage compliance succeeds but with warnings
  *              => case 4: Hi >  Dn
@@ -71,7 +70,6 @@
 #include "udc.h"
 #include "bits.h"
 #include "host.h"
-#include "debug.h"
 #include "otg.h"
 #include "otg_fsm.h"
 
@@ -688,52 +686,39 @@ static int ci_get_platdata(struct device *dev,
 	if (usb_get_maximum_speed(dev) == USB_SPEED_FULL)
 		platdata->flags |= CI_HDRC_FORCE_FULLSPEED;
 
-	if (of_find_property(dev->of_node, "phy-clkgate-delay-us", NULL))
 	of_property_read_u32(dev->of_node, "phy-clkgate-delay-us",
 				     &platdata->phy_clkgate_delay_us);
 
 	platdata->itc_setting = 1;
-	if (of_find_property(dev->of_node, "itc-setting", NULL)) {
-		ret = of_property_read_u32(dev->of_node, "itc-setting",
-			&platdata->itc_setting);
-		if (ret) {
-			dev_err(dev,
-				"failed to get itc-setting\n");
-			return ret;
-		}
-	}
 
-	if (of_find_property(dev->of_node, "ahb-burst-config", NULL)) {
+	of_property_read_u32(dev->of_node, "itc-setting",
+					&platdata->itc_setting);
+
 	ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
 				&platdata->ahb_burst_config);
-		if (ret) {
-			dev_err(dev,
-				"failed to get ahb-burst-config\n");
+	if (!ret) {
+		platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
+	} else if (ret != -EINVAL) {
+		dev_err(dev, "failed to get ahb-burst-config\n");
 		return ret;
 	}
-		platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
-	}
 
-	if (of_find_property(dev->of_node, "tx-burst-size-dword", NULL)) {
 	ret = of_property_read_u32(dev->of_node, "tx-burst-size-dword",
 				&platdata->tx_burst_size);
-		if (ret) {
-			dev_err(dev,
-				"failed to get tx-burst-size-dword\n");
-			return ret;
-		}
+	if (!ret) {
 		platdata->flags |= CI_HDRC_OVERRIDE_TX_BURST;
+	} else if (ret != -EINVAL) {
+		dev_err(dev, "failed to get tx-burst-size-dword\n");
+		return ret;
 	}
 
-	if (of_find_property(dev->of_node, "rx-burst-size-dword", NULL)) {
 	ret = of_property_read_u32(dev->of_node, "rx-burst-size-dword",
 				&platdata->rx_burst_size);
-		if (ret) {
-			dev_err(dev,
-				"failed to get rx-burst-size-dword\n");
-			return ret;
-		}
+	if (!ret) {
 		platdata->flags |= CI_HDRC_OVERRIDE_RX_BURST;
+	} else if (ret != -EINVAL) {
+		dev_err(dev, "failed to get rx-burst-size-dword\n");
+		return ret;
 	}
 
 	ext_id = ERR_PTR(-ENODEV);

drivers/usb/chipidea/debug.c

@@ -15,7 +15,6 @@
 #include "ci.h"
 #include "udc.h"
 #include "bits.h"
-#include "debug.h"
 #include "otg.h"
 
 /**

drivers/usb/chipidea/debug.h

@@ -1,30 +0,0 @@
-/*
- * debug.h - ChipIdea USB driver debug interfaces
- *
- * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
- *
- * Author: David Lopo
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#ifndef __DRIVERS_USB_CHIPIDEA_DEBUG_H
-#define __DRIVERS_USB_CHIPIDEA_DEBUG_H
-
-#ifdef CONFIG_USB_CHIPIDEA_DEBUG
-int dbg_create_files(struct ci_hdrc *ci);
-void dbg_remove_files(struct ci_hdrc *ci);
-#else
-static inline int dbg_create_files(struct ci_hdrc *ci)
-{
-	return 0;
-}
-
-static inline void dbg_remove_files(struct ci_hdrc *ci)
-{
-}
-#endif
-
-#endif /* __DRIVERS_USB_CHIPIDEA_DEBUG_H */

drivers/usb/chipidea/host.c

@@ -190,6 +190,8 @@ static void host_stop(struct ci_hdrc *ci)
 			(ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
 				regulator_disable(ci->platdata->reg_vbus);
 	}
+	ci->hcd = NULL;
+	ci->otg.host = NULL;
 }
 
 

drivers/usb/chipidea/otg_fsm.c

@@ -485,20 +485,30 @@ static void ci_otg_loc_conn(struct otg_fsm *fsm, int on)
 
 /*
  * Generate SOF by host.
- * This is controlled through suspend/resume the port.
  * In host mode, controller will automatically send SOF.
  * Suspend will block the data on the port.
+ *
+ * This is controlled through usbcore by usb autosuspend,
+ * so the usb device class driver need support autosuspend,
+ * otherwise the bus suspend will not happen.
  */
 static void ci_otg_loc_sof(struct otg_fsm *fsm, int on)
 {
-	struct ci_hdrc	*ci = container_of(fsm, struct ci_hdrc, fsm);
+	struct usb_device *udev;
 
-	if (on)
-		hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_FPR,
-							PORTSC_FPR);
-	else
-		hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_SUSP,
-							PORTSC_SUSP);
+	if (!fsm->otg->host)
+		return;
+
+	udev = usb_hub_find_child(fsm->otg->host->root_hub, 1);
+	if (!udev)
+		return;
+
+	if (on) {
+		usb_disable_autosuspend(udev);
+	} else {
+		pm_runtime_set_autosuspend_delay(&udev->dev, 0);
+		usb_enable_autosuspend(udev);
+	}
 }
 
 /*

drivers/usb/chipidea/udc.c

@@ -26,7 +26,6 @@
 #include "ci.h"
 #include "udc.h"
 #include "bits.h"
-#include "debug.h"
 #include "otg.h"
 #include "otg_fsm.h"
 
@@ -403,9 +402,9 @@ static inline u8 _usb_addr(struct ci_hw_ep *ep)
 }
 
 /**
- * _hardware_queue: configures a request at hardware level
- * @gadget: gadget
+ * _hardware_enqueue: configures a request at hardware level
  * @hwep:   endpoint
+ * @hwreq:  request
  *
  * This function returns an error code
  */
@@ -434,19 +433,28 @@ static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 	if (hwreq->req.dma % PAGE_SIZE)
 		pages--;
 
-	if (rest == 0)
-		add_td_to_list(hwep, hwreq, 0);
+	if (rest == 0) {
+		ret = add_td_to_list(hwep, hwreq, 0);
+		if (ret < 0)
+			goto done;
+	}
 
 	while (rest > 0) {
 		unsigned count = min(hwreq->req.length - hwreq->req.actual,
 					(unsigned)(pages * CI_HDRC_PAGE_SIZE));
-		add_td_to_list(hwep, hwreq, count);
+		ret = add_td_to_list(hwep, hwreq, count);
+		if (ret < 0)
+			goto done;
+
 		rest -= count;
 	}
 
 	if (hwreq->req.zero && hwreq->req.length && hwep->dir == TX
-	    && (hwreq->req.length % hwep->ep.maxpacket == 0))
-		add_td_to_list(hwep, hwreq, 0);
+	    && (hwreq->req.length % hwep->ep.maxpacket == 0)) {
+		ret = add_td_to_list(hwep, hwreq, 0);
+		if (ret < 0)
+			goto done;
+	}
 
 	firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
 
@@ -787,8 +795,12 @@ static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
 
 /**
  * _ep_queue: queues (submits) an I/O request to an endpoint
+ * @ep:        endpoint
+ * @req:       request
+ * @gfp_flags: GFP flags (not used)
  *
  * Caller must hold lock
+ * This function returns an error code
  */
 static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
 		    gfp_t __maybe_unused gfp_flags)