[PATCH 0/3] inherit dma configuration from parent dev

[PATCH 0/3] inherit dma configuration from parent dev

[Sriram Dash]

For xhci-hcd platform device, all the DMA parameters are not configured
properly, notably dma ops for dwc3 devices.

The idea here is that you pass in the parent of_node along with the child
device pointer, so it would behave exactly like the parent already does.
The difference is that it also handles all the other attributes besides
the mask.

Sriram Dash (3):
  usb: dwc3: host: inherit dma configuration from parent dev
  usb: dwc3: host: Do not use dma_set_coherent_mask
  usb: dwc3: host: Do not use dma_coerce_mask_and_coherent

 drivers/usb/chipidea/core.c    |  3 ---
 drivers/usb/chipidea/host.c    |  3 ++-
 drivers/usb/chipidea/udc.c     | 10 +++++----
 drivers/usb/core/buffer.c      | 12 +++++------
 drivers/usb/core/hcd.c         | 48 +++++++++++++++++++++++++-----------------
 drivers/usb/core/usb.c         | 18 ++++++++--------
 drivers/usb/dwc3/core.c        | 28 ++++++++++++------------
 drivers/usb/dwc3/core.h        |  1 +
 drivers/usb/dwc3/dwc3-exynos.c | 10 ---------
 drivers/usb/dwc3/dwc3-st.c     |  1 -
 drivers/usb/dwc3/ep0.c         |  8 +++----
 drivers/usb/dwc3/gadget.c      | 37 ++++++++++++++++----------------
 drivers/usb/dwc3/host.c        | 12 ++++-------
 drivers/usb/host/ehci-fsl.c    |  4 ++--
 drivers/usb/host/xhci-mem.c    | 12 +++++------
 drivers/usb/host/xhci-plat.c   | 33 +++++++++++++++++++++++------
 drivers/usb/host/xhci.c        | 15 +++++++++----
 include/linux/usb.h            |  1 +
 include/linux/usb/hcd.h        |  3 +++
 19 files changed, 144 insertions(+), 115 deletions(-)

-- 
2.1.0

[PATCH 1/3] usb: dwc3: host: inherit dma configuration from parent dev

[Sriram Dash]

For xhci-hcd platform device, all the DMA parameters are not configured
properly, notably dma ops for dwc3 devices.

The idea here is that you pass in the parent of_node along with the child
device pointer, so it would behave exactly like the parent already does.
The difference is that it also handles all the other attributes besides
the mask.
Splitting the usb_bus->controller field into the Linux-internal device
(used for the sysfs hierarchy, for printks and for power management)
and a new pointer (used for DMA, DT enumeration and phy lookup) probably
covers all that we really need.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sriram Dash <sriram.dash@nxp.com>
Cc: Felipe Balbi <felipe.balbi@linux.intel.com>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Sinjan Kumar <sinjank@codeaurora.org>
Cc: David Fisher <david.fisher1@synopsys.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: "Thang Q. Nguyen" <tqnguyen@apm.com>
Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Ming Lei <tom.leiming@gmail.com>
Cc: Jon Masters <jcm@redhat.com>
Cc: Dann Frazier <dann.frazier@canonical.com>
Cc: Peter Chen <peter.chen@nxp.com>
Cc: Leo Li <pku.leo@gmail.com>
---
 drivers/usb/chipidea/host.c  |  3 ++-
 drivers/usb/chipidea/udc.c   | 10 +++++----
 drivers/usb/core/buffer.c    | 12 +++++------
 drivers/usb/core/hcd.c       | 48 ++++++++++++++++++++++++++------------------
 drivers/usb/core/usb.c       | 18 ++++++++---------
 drivers/usb/dwc3/core.c      | 22 +++++++++++++-------
 drivers/usb/dwc3/core.h      |  1 +
 drivers/usb/dwc3/ep0.c       |  8 ++++----
 drivers/usb/dwc3/gadget.c    | 37 +++++++++++++++++-----------------
 drivers/usb/dwc3/host.c      |  8 ++++----
 drivers/usb/host/ehci-fsl.c  |  4 ++--
 drivers/usb/host/xhci-mem.c  | 12 +++++------
 drivers/usb/host/xhci-plat.c | 33 +++++++++++++++++++++++-------
 drivers/usb/host/xhci.c      | 15 ++++++++++----
 include/linux/usb.h          |  1 +
 include/linux/usb/hcd.h      |  3 +++
 16 files changed, 144 insertions(+), 91 deletions(-)

diff --git a/drivers/usb/chipidea/host.c b/drivers/usb/chipidea/host.c
index 96ae695..ca27893 100644
--- a/drivers/usb/chipidea/host.c
+++ b/drivers/usb/chipidea/host.c
@@ -116,7 +116,8 @@ static int host_start(struct ci_hdrc *ci)
 	if (usb_disabled())
 		return -ENODEV;
 
-	hcd = usb_create_hcd(&ci_ehci_hc_driver, ci->dev, dev_name(ci->dev));
+	hcd = __usb_create_hcd(&ci_ehci_hc_driver, ci->dev->parent,
+			       ci->dev, dev_name(ci->dev), NULL);
 	if (!hcd)
 		return -ENOMEM;
 
diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index 661f43f..bc55922 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -423,7 +423,8 @@ static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 
 	hwreq->req.status = -EALREADY;
 
-	ret = usb_gadget_map_request(&ci->gadget, &hwreq->req, hwep->dir);
+	ret = usb_gadget_map_request_by_dev(ci->dev->parent,
+					    &hwreq->req, hwep->dir);
 	if (ret)
 		return ret;
 
@@ -603,7 +604,8 @@ static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 		list_del_init(&node->td);
 	}
 
-	usb_gadget_unmap_request(&hwep->ci->gadget, &hwreq->req, hwep->dir);
+	usb_gadget_unmap_request_by_dev(hwep->ci->dev->parent,
+					&hwreq->req, hwep->dir);
 
 	hwreq->req.actual += actual;
 
@@ -1904,13 +1906,13 @@ static int udc_start(struct ci_hdrc *ci)
 	INIT_LIST_HEAD(&ci->gadget.ep_list);
 
 	/* alloc resources */
-	ci->qh_pool = dma_pool_create("ci_hw_qh", dev,
+	ci->qh_pool = dma_pool_create("ci_hw_qh", dev->parent,
 				       sizeof(struct ci_hw_qh),
 				       64, CI_HDRC_PAGE_SIZE);
 	if (ci->qh_pool == NULL)
 		return -ENOMEM;
 
-	ci->td_pool = dma_pool_create("ci_hw_td", dev,
+	ci->td_pool = dma_pool_create("ci_hw_td", dev->parent,
 				       sizeof(struct ci_hw_td),
 				       64, CI_HDRC_PAGE_SIZE);
 	if (ci->td_pool == NULL) {
diff --git a/drivers/usb/core/buffer.c b/drivers/usb/core/buffer.c
index 98e39f9..1e41ef7 100644
--- a/drivers/usb/core/buffer.c
+++ b/drivers/usb/core/buffer.c
@@ -63,7 +63,7 @@ int hcd_buffer_create(struct usb_hcd *hcd)
 	int		i, size;
 
 	if (!IS_ENABLED(CONFIG_HAS_DMA) ||
-	    (!hcd->self.controller->dma_mask &&
+	    (!hcd->self.sysdev->dma_mask &&
 	     !(hcd->driver->flags & HCD_LOCAL_MEM)))
 		return 0;
 
@@ -72,7 +72,7 @@ int hcd_buffer_create(struct usb_hcd *hcd)
 		if (!size)
 			continue;
 		snprintf(name, sizeof(name), "buffer-%d", size);
-		hcd->pool[i] = dma_pool_create(name, hcd->self.controller,
+		hcd->pool[i] = dma_pool_create(name, hcd->self.sysdev,
 				size, size, 0);
 		if (!hcd->pool[i]) {
 			hcd_buffer_destroy(hcd);
@@ -127,7 +127,7 @@ void *hcd_buffer_alloc(
 
 	/* some USB hosts just use PIO */
 	if (!IS_ENABLED(CONFIG_HAS_DMA) ||
-	    (!bus->controller->dma_mask &&
+	    (!bus->sysdev->dma_mask &&
 	     !(hcd->driver->flags & HCD_LOCAL_MEM))) {
 		*dma = ~(dma_addr_t) 0;
 		return kmalloc(size, mem_flags);
@@ -137,7 +137,7 @@ void *hcd_buffer_alloc(
 		if (size <= pool_max[i])
 			return dma_pool_alloc(hcd->pool[i], mem_flags, dma);
 	}
-	return dma_alloc_coherent(hcd->self.controller, size, dma, mem_flags);
+	return dma_alloc_coherent(hcd->self.sysdev, size, dma, mem_flags);
 }
 
 void hcd_buffer_free(
@@ -154,7 +154,7 @@ void hcd_buffer_free(
 		return;
 
 	if (!IS_ENABLED(CONFIG_HAS_DMA) ||
-	    (!bus->controller->dma_mask &&
+	    (!bus->sysdev->dma_mask &&
 	     !(hcd->driver->flags & HCD_LOCAL_MEM))) {
 		kfree(addr);
 		return;
@@ -166,5 +166,5 @@ void hcd_buffer_free(
 			return;
 		}
 	}
-	dma_free_coherent(hcd->self.controller, size, addr, dma);
+	dma_free_coherent(hcd->self.sysdev, size, addr, dma);
 }
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 479e223..f8feb08 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -1073,6 +1073,7 @@ static void usb_deregister_bus (struct usb_bus *bus)
 static int register_root_hub(struct usb_hcd *hcd)
 {
 	struct device *parent_dev = hcd->self.controller;
+	struct device *sysdev = hcd->self.sysdev;
 	struct usb_device *usb_dev = hcd->self.root_hub;
 	const int devnum = 1;
 	int retval;
@@ -1119,7 +1120,7 @@ static int register_root_hub(struct usb_hcd *hcd)
 		/* Did the HC die before the root hub was registered? */
 		if (HCD_DEAD(hcd))
 			usb_hc_died (hcd);	/* This time clean up */
-		usb_dev->dev.of_node = parent_dev->of_node;
+		usb_dev->dev.of_node = sysdev->of_node;
 	}
 	mutex_unlock(&usb_bus_idr_lock);
 
@@ -1465,19 +1466,19 @@ void usb_hcd_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
 	dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
 	if (IS_ENABLED(CONFIG_HAS_DMA) &&
 	    (urb->transfer_flags & URB_DMA_MAP_SG))
-		dma_unmap_sg(hcd->self.controller,
+		dma_unmap_sg(hcd->self.sysdev,
 				urb->sg,
 				urb->num_sgs,
 				dir);
 	else if (IS_ENABLED(CONFIG_HAS_DMA) &&
 		 (urb->transfer_flags & URB_DMA_MAP_PAGE))
-		dma_unmap_page(hcd->self.controller,
+		dma_unmap_page(hcd->self.sysdev,
 				urb->transfer_dma,
 				urb->transfer_buffer_length,
 				dir);
 	else if (IS_ENABLED(CONFIG_HAS_DMA) &&
 		 (urb->transfer_flags & URB_DMA_MAP_SINGLE))
-		dma_unmap_single(hcd->self.controller,
+		dma_unmap_single(hcd->self.sysdev,
 				urb->transfer_dma,
 				urb->transfer_buffer_length,
 				dir);
@@ -1520,11 +1521,11 @@ int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
 			return ret;
 		if (IS_ENABLED(CONFIG_HAS_DMA) && hcd->self.uses_dma) {
 			urb->setup_dma = dma_map_single(
-					hcd->self.controller,
+					hcd->self.sysdev,
 					urb->setup_packet,
 					sizeof(struct usb_ctrlrequest),
 					DMA_TO_DEVICE);
-			if (dma_mapping_error(hcd->self.controller,
+			if (dma_mapping_error(hcd->self.sysdev,
 						urb->setup_dma))
 				return -EAGAIN;
 			urb->transfer_flags |= URB_SETUP_MAP_SINGLE;
@@ -1555,7 +1556,7 @@ int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
 				}
 
 				n = dma_map_sg(
-						hcd->self.controller,
+						hcd->self.sysdev,
 						urb->sg,
 						urb->num_sgs,
 						dir);
@@ -1570,12 +1571,12 @@ int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
 			} else if (urb->sg) {
 				struct scatterlist *sg = urb->sg;
 				urb->transfer_dma = dma_map_page(
-						hcd->self.controller,
+						hcd->self.sysdev,
 						sg_page(sg),
 						sg->offset,
 						urb->transfer_buffer_length,
 						dir);
-				if (dma_mapping_error(hcd->self.controller,
+				if (dma_mapping_error(hcd->self.sysdev,
 						urb->transfer_dma))
 					ret = -EAGAIN;
 				else
@@ -1585,11 +1586,11 @@ int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
 				ret = -EAGAIN;
 			} else {
 				urb->transfer_dma = dma_map_single(
-						hcd->self.controller,
+						hcd->self.sysdev,
 						urb->transfer_buffer,
 						urb->transfer_buffer_length,
 						dir);
-				if (dma_mapping_error(hcd->self.controller,
+				if (dma_mapping_error(hcd->self.sysdev,
 						urb->transfer_dma))
 					ret = -EAGAIN;
 				else
@@ -2511,8 +2512,8 @@ static void init_giveback_urb_bh(struct giveback_urb_bh *bh)
  * Return: On success, a pointer to the created and initialized HCD structure.
  * On failure (e.g. if memory is unavailable), %NULL.
  */
-struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
-		struct device *dev, const char *bus_name,
+struct usb_hcd *__usb_create_hcd(const struct hc_driver *driver,
+		struct device *sysdev, struct device *dev, const char *bus_name,
 		struct usb_hcd *primary_hcd)
 {
 	struct usb_hcd *hcd;
@@ -2553,8 +2554,9 @@ struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
 
 	usb_bus_init(&hcd->self);
 	hcd->self.controller = dev;
+	hcd->self.sysdev = sysdev;
 	hcd->self.bus_name = bus_name;
-	hcd->self.uses_dma = (dev->dma_mask != NULL);
+	hcd->self.uses_dma = (sysdev->dma_mask != NULL);
 
 	init_timer(&hcd->rh_timer);
 	hcd->rh_timer.function = rh_timer_func;
@@ -2569,6 +2571,14 @@ struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
 			"USB Host Controller";
 	return hcd;
 }
+EXPORT_SYMBOL_GPL(__usb_create_hcd);
+
+struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
+		struct device *dev, const char *bus_name,
+		struct usb_hcd *primary_hcd)
+{
+	return __usb_create_hcd(driver, dev, dev, bus_name, primary_hcd);
+}
 EXPORT_SYMBOL_GPL(usb_create_shared_hcd);
 
 /**
@@ -2588,7 +2598,7 @@ EXPORT_SYMBOL_GPL(usb_create_shared_hcd);
 struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
 		struct device *dev, const char *bus_name)
 {
-	return usb_create_shared_hcd(driver, dev, bus_name, NULL);
+	return __usb_create_hcd(driver, dev, dev, bus_name, NULL);
 }
 EXPORT_SYMBOL_GPL(usb_create_hcd);
 
@@ -2715,7 +2725,7 @@ int usb_add_hcd(struct usb_hcd *hcd,
 	struct usb_device *rhdev;
 
 	if (IS_ENABLED(CONFIG_USB_PHY) && !hcd->usb_phy) {
-		struct usb_phy *phy = usb_get_phy_dev(hcd->self.controller, 0);
+		struct usb_phy *phy = usb_get_phy_dev(hcd->self.sysdev, 0);
 
 		if (IS_ERR(phy)) {
 			retval = PTR_ERR(phy);
@@ -2733,7 +2743,7 @@ int usb_add_hcd(struct usb_hcd *hcd,
 	}
 
 	if (IS_ENABLED(CONFIG_GENERIC_PHY) && !hcd->phy) {
-		struct phy *phy = phy_get(hcd->self.controller, "usb");
+		struct phy *phy = phy_get(hcd->self.sysdev, "usb");
 
 		if (IS_ERR(phy)) {
 			retval = PTR_ERR(phy);
@@ -2781,7 +2791,7 @@ int usb_add_hcd(struct usb_hcd *hcd,
 	 */
 	retval = hcd_buffer_create(hcd);
 	if (retval != 0) {
-		dev_dbg(hcd->self.controller, "pool alloc failed\n");
+		dev_dbg(hcd->self.sysdev, "pool alloc failed\n");
 		goto err_create_buf;
 	}
 
@@ -2791,7 +2801,7 @@ int usb_add_hcd(struct usb_hcd *hcd,
 
 	rhdev = usb_alloc_dev(NULL, &hcd->self, 0);
 	if (rhdev == NULL) {
-		dev_err(hcd->self.controller, "unable to allocate root hub\n");
+		dev_err(hcd->self.sysdev, "unable to allocate root hub\n");
 		retval = -ENOMEM;
 		goto err_allocate_root_hub;
 	}
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 5921514..3abe83a 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -450,9 +450,9 @@ struct usb_device *usb_alloc_dev(struct usb_device *parent,
 	 * Note: calling dma_set_mask() on a USB device would set the
 	 * mask for the entire HCD, so don't do that.
 	 */
-	dev->dev.dma_mask = bus->controller->dma_mask;
-	dev->dev.dma_pfn_offset = bus->controller->dma_pfn_offset;
-	set_dev_node(&dev->dev, dev_to_node(bus->controller));
+	dev->dev.dma_mask = bus->sysdev->dma_mask;
+	dev->dev.dma_pfn_offset = bus->sysdev->dma_pfn_offset;
+	set_dev_node(&dev->dev, dev_to_node(bus->sysdev));
 	dev->state = USB_STATE_ATTACHED;
 	dev->lpm_disable_count = 1;
 	atomic_set(&dev->urbnum, 0);
@@ -800,7 +800,7 @@ struct urb *usb_buffer_map(struct urb *urb)
 	if (!urb
 			|| !urb->dev
 			|| !(bus = urb->dev->bus)
-			|| !(controller = bus->controller))
+			|| !(controller = bus->sysdev))
 		return NULL;
 
 	if (controller->dma_mask) {
@@ -838,7 +838,7 @@ void usb_buffer_dmasync(struct urb *urb)
 			|| !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)
 			|| !urb->dev
 			|| !(bus = urb->dev->bus)
-			|| !(controller = bus->controller))
+			|| !(controller = bus->sysdev))
 		return;
 
 	if (controller->dma_mask) {
@@ -872,7 +872,7 @@ void usb_buffer_unmap(struct urb *urb)
 			|| !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)
 			|| !urb->dev
 			|| !(bus = urb->dev->bus)
-			|| !(controller = bus->controller))
+			|| !(controller = bus->sysdev))
 		return;
 
 	if (controller->dma_mask) {
@@ -922,7 +922,7 @@ int usb_buffer_map_sg(const struct usb_device *dev, int is_in,
 
 	if (!dev
 			|| !(bus = dev->bus)
-			|| !(controller = bus->controller)
+			|| !(controller = bus->sysdev)
 			|| !controller->dma_mask)
 		return -EINVAL;
 
@@ -958,7 +958,7 @@ void usb_buffer_dmasync_sg(const struct usb_device *dev, int is_in,
 
 	if (!dev
 			|| !(bus = dev->bus)
-			|| !(controller = bus->controller)
+			|| !(controller = bus->sysdev)
 			|| !controller->dma_mask)
 		return;
 
@@ -986,7 +986,7 @@ void usb_buffer_unmap_sg(const struct usb_device *dev, int is_in,
 
 	if (!dev
 			|| !(bus = dev->bus)
-			|| !(controller = bus->controller)
+			|| !(controller = bus->sysdev)
 			|| !controller->dma_mask)
 		return;
 
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 7287a76..e0f64ef 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -25,6 +25,7 @@
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/platform_device.h>
+#include <linux/pci.h>
 #include <linux/pm_runtime.h>
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
@@ -229,7 +230,7 @@ static void dwc3_frame_length_adjustment(struct dwc3 *dwc)
 static void dwc3_free_one_event_buffer(struct dwc3 *dwc,
 		struct dwc3_event_buffer *evt)
 {
-	dma_free_coherent(dwc->dev, evt->length, evt->buf, evt->dma);
+	dma_free_coherent(dwc->sysdev, evt->length, evt->buf, evt->dma);
 }
 
 /**
@@ -251,7 +252,7 @@ static struct dwc3_event_buffer *dwc3_alloc_one_event_buffer(struct dwc3 *dwc,
 
 	evt->dwc	= dwc;
 	evt->length	= length;
-	evt->buf	= dma_alloc_coherent(dwc->dev, length,
+	evt->buf	= dma_alloc_coherent(dwc->sysdev, length,
 			&evt->dma, GFP_KERNEL);
 	if (!evt->buf)
 		return ERR_PTR(-ENOMEM);
@@ -370,11 +371,11 @@ static int dwc3_setup_scratch_buffers(struct dwc3 *dwc)
 	if (!WARN_ON(dwc->scratchbuf))
 		return 0;
 
-	scratch_addr = dma_map_single(dwc->dev, dwc->scratchbuf,
+	scratch_addr = dma_map_single(dwc->sysdev, dwc->scratchbuf,
 			dwc->nr_scratch * DWC3_SCRATCHBUF_SIZE,
 			DMA_BIDIRECTIONAL);
-	if (dma_mapping_error(dwc->dev, scratch_addr)) {
-		dev_err(dwc->dev, "failed to map scratch buffer\n");
+	if (dma_mapping_error(dwc->sysdev, scratch_addr)) {
+		dev_err(dwc->sysdev, "failed to map scratch buffer\n");
 		ret = -EFAULT;
 		goto err0;
 	}
@@ -398,7 +399,7 @@ static int dwc3_setup_scratch_buffers(struct dwc3 *dwc)
 	return 0;
 
 err1:
-	dma_unmap_single(dwc->dev, dwc->scratch_addr, dwc->nr_scratch *
+	dma_unmap_single(dwc->sysdev, dwc->scratch_addr, dwc->nr_scratch *
 			DWC3_SCRATCHBUF_SIZE, DMA_BIDIRECTIONAL);
 
 err0:
@@ -417,7 +418,7 @@ static void dwc3_free_scratch_buffers(struct dwc3 *dwc)
 	if (!WARN_ON(dwc->scratchbuf))
 		return;
 
-	dma_unmap_single(dwc->dev, dwc->scratch_addr, dwc->nr_scratch *
+	dma_unmap_single(dwc->sysdev, dwc->scratch_addr, dwc->nr_scratch *
 			DWC3_SCRATCHBUF_SIZE, DMA_BIDIRECTIONAL);
 	kfree(dwc->scratchbuf);
 }
@@ -943,6 +944,13 @@ static int dwc3_probe(struct platform_device *pdev)
 	dwc = PTR_ALIGN(mem, DWC3_ALIGN_MASK + 1);
 	dwc->mem = mem;
 	dwc->dev = dev;
+#ifdef CONFIG_PCI
+	/* TODO: or some other way of detecting this? */
+	if (dwc->dev->parent && dwc->dev->parent->bus == &pci_bus_type)
+		dwc->sysdev = dwc->dev->parent;
+	else
+#endif
+		dwc->sysdev = dwc->dev;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 6b60e42..b166b0a 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -851,6 +851,7 @@ struct dwc3 {
 	spinlock_t		lock;
 
 	struct device		*dev;
+	struct device		*sysdev;
 
 	struct platform_device	*xhci;
 	struct resource		xhci_resources[DWC3_XHCI_RESOURCES_NUM];
diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index fe79d77..4d13723 100644
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -974,8 +974,8 @@ static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
 		u32	transfer_size = 0;
 		u32	maxpacket;
 
-		ret = usb_gadget_map_request(&dwc->gadget, &req->request,
-				dep->number);
+		ret = usb_gadget_map_request_by_dev(dwc->sysdev,
+				&req->request, dep->number);
 		if (ret) {
 			dwc3_trace(trace_dwc3_ep0, "failed to map request");
 			return;
@@ -1002,8 +1002,8 @@ static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
 				dwc->ep0_bounce_addr, transfer_size,
 				DWC3_TRBCTL_CONTROL_DATA, false);
 	} else {
-		ret = usb_gadget_map_request(&dwc->gadget, &req->request,
-				dep->number);
+		ret = usb_gadget_map_request_by_dev(dwc->sysdev,
+				&req->request, dep->number);
 		if (ret) {
 			dwc3_trace(trace_dwc3_ep0, "failed to map request");
 			return;
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 07cc892..35375f4 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -185,8 +185,8 @@ void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
 	if (dwc->ep0_bounced && dep->number == 0)
 		dwc->ep0_bounced = false;
 	else
-		usb_gadget_unmap_request(&dwc->gadget, &req->request,
-				req->direction);
+		usb_gadget_unmap_request_by_dev(dwc->sysdev,
+				&req->request, req->direction);
 
 	trace_dwc3_gadget_giveback(req);
 
@@ -365,7 +365,7 @@ static int dwc3_alloc_trb_pool(struct dwc3_ep *dep)
 	if (dep->trb_pool)
 		return 0;
 
-	dep->trb_pool = dma_alloc_coherent(dwc->dev,
+	dep->trb_pool = dma_alloc_coherent(dwc->sysdev,
 			sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
 			&dep->trb_pool_dma, GFP_KERNEL);
 	if (!dep->trb_pool) {
@@ -381,7 +381,7 @@ static void dwc3_free_trb_pool(struct dwc3_ep *dep)
 {
 	struct dwc3		*dwc = dep->dwc;
 
-	dma_free_coherent(dwc->dev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
+	dma_free_coherent(dwc->sysdev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
 			dep->trb_pool, dep->trb_pool_dma);
 
 	dep->trb_pool = NULL;
@@ -990,8 +990,8 @@ static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep, u16 cmd_param)
 		 * here and stop, unmap, free and del each of the linked
 		 * requests instead of what we do now.
 		 */
-		usb_gadget_unmap_request(&dwc->gadget, &req->request,
-				req->direction);
+		usb_gadget_unmap_request_by_dev(dwc->sysdev,
+				&req->request, req->direction);
 		list_del(&req->list);
 		return ret;
 	}
@@ -1064,8 +1064,8 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
 
 	trace_dwc3_ep_queue(req);
 
-	ret = usb_gadget_map_request(&dwc->gadget, &req->request,
-			dep->direction);
+	ret = usb_gadget_map_request_by_dev(dwc->sysdev, &req->request,
+					    dep->direction);
 	if (ret)
 		return ret;
 
@@ -2879,7 +2879,7 @@ int dwc3_gadget_init(struct dwc3 *dwc)
 
 	dwc->irq_gadget = irq;
 
-	dwc->ctrl_req = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
+	dwc->ctrl_req = dma_alloc_coherent(dwc->sysdev, sizeof(*dwc->ctrl_req),
 			&dwc->ctrl_req_addr, GFP_KERNEL);
 	if (!dwc->ctrl_req) {
 		dev_err(dwc->dev, "failed to allocate ctrl request\n");
@@ -2887,8 +2887,9 @@ int dwc3_gadget_init(struct dwc3 *dwc)
 		goto err0;
 	}
 
-	dwc->ep0_trb = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ep0_trb) * 2,
-			&dwc->ep0_trb_addr, GFP_KERNEL);
+	dwc->ep0_trb = dma_alloc_coherent(dwc->sysdev,
+					  sizeof(*dwc->ep0_trb) * 2,
+					  &dwc->ep0_trb_addr, GFP_KERNEL);
 	if (!dwc->ep0_trb) {
 		dev_err(dwc->dev, "failed to allocate ep0 trb\n");
 		ret = -ENOMEM;
@@ -2901,7 +2902,7 @@ int dwc3_gadget_init(struct dwc3 *dwc)
 		goto err2;
 	}
 
-	dwc->ep0_bounce = dma_alloc_coherent(dwc->dev,
+	dwc->ep0_bounce = dma_alloc_coherent(dwc->sysdev,
 			DWC3_EP0_BOUNCE_SIZE, &dwc->ep0_bounce_addr,
 			GFP_KERNEL);
 	if (!dwc->ep0_bounce) {
@@ -2973,18 +2974,18 @@ int dwc3_gadget_init(struct dwc3 *dwc)
 
 err4:
 	dwc3_gadget_free_endpoints(dwc);
-	dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
+	dma_free_coherent(dwc->sysdev, DWC3_EP0_BOUNCE_SIZE,
 			dwc->ep0_bounce, dwc->ep0_bounce_addr);
 
 err3:
 	kfree(dwc->setup_buf);
 
 err2:
-	dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
+	dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb),
 			dwc->ep0_trb, dwc->ep0_trb_addr);
 
 err1:
-	dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
+	dma_free_coherent(dwc->sysdev, sizeof(*dwc->ctrl_req),
 			dwc->ctrl_req, dwc->ctrl_req_addr);
 
 err0:
@@ -2999,16 +3000,16 @@ void dwc3_gadget_exit(struct dwc3 *dwc)
 
 	dwc3_gadget_free_endpoints(dwc);
 
-	dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
+	dma_free_coherent(dwc->sysdev, DWC3_EP0_BOUNCE_SIZE,
 			dwc->ep0_bounce, dwc->ep0_bounce_addr);
 
 	kfree(dwc->setup_buf);
 	kfree(dwc->zlp_buf);
 
-	dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
+	dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb),
 			dwc->ep0_trb, dwc->ep0_trb_addr);
 
-	dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
+	dma_free_coherent(dwc->sysdev, sizeof(*dwc->ctrl_req),
 			dwc->ctrl_req, dwc->ctrl_req_addr);
 }
 
diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
index f6533c6..bb83eee 100644
--- a/drivers/usb/dwc3/host.c
+++ b/drivers/usb/dwc3/host.c
@@ -112,9 +112,9 @@ int dwc3_host_init(struct dwc3 *dwc)
 	return 0;
 err2:
 	phy_remove_lookup(dwc->usb2_generic_phy, "usb2-phy",
-			  dev_name(&xhci->dev));
+			  dev_name(dwc->dev));
 	phy_remove_lookup(dwc->usb3_generic_phy, "usb3-phy",
-			  dev_name(&xhci->dev));
+			  dev_name(dwc->dev));
 err1:
 	platform_device_put(xhci);
 	return ret;
@@ -123,8 +123,8 @@ int dwc3_host_init(struct dwc3 *dwc)
 void dwc3_host_exit(struct dwc3 *dwc)
 {
 	phy_remove_lookup(dwc->usb2_generic_phy, "usb2-phy",
-			  dev_name(&dwc->xhci->dev));
+			  dev_name(dwc->dev));
 	phy_remove_lookup(dwc->usb3_generic_phy, "usb3-phy",
-			  dev_name(&dwc->xhci->dev));
+			  dev_name(dwc->dev));
 	platform_device_unregister(dwc->xhci);
 }
diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index 9f5ffb6..b241995 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -96,8 +96,8 @@ static int fsl_ehci_drv_probe(struct platform_device *pdev)
 	}
 	irq = res->start;
 
-	hcd = usb_create_hcd(&fsl_ehci_hc_driver, &pdev->dev,
-				dev_name(&pdev->dev));
+	hcd = __usb_create_hcd(&fsl_ehci_hc_driver, &pdev->dev.parent,
+				&pdev->dev, dev_name(&pdev->dev), NULL);
 	if (!hcd) {
 		retval = -ENOMEM;
 		goto err1;
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 6afe323..79608df 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -586,7 +586,7 @@ static void xhci_free_stream_ctx(struct xhci_hcd *xhci,
 		unsigned int num_stream_ctxs,
 		struct xhci_stream_ctx *stream_ctx, dma_addr_t dma)
 {
-	struct device *dev = xhci_to_hcd(xhci)->self.controller;
+	struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
 	size_t size = sizeof(struct xhci_stream_ctx) * num_stream_ctxs;
 
 	if (size > MEDIUM_STREAM_ARRAY_SIZE)
@@ -614,7 +614,7 @@ static struct xhci_stream_ctx *xhci_alloc_stream_ctx(struct xhci_hcd *xhci,
 		unsigned int num_stream_ctxs, dma_addr_t *dma,
 		gfp_t mem_flags)
 {
-	struct device *dev = xhci_to_hcd(xhci)->self.controller;
+	struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
 	size_t size = sizeof(struct xhci_stream_ctx) * num_stream_ctxs;
 
 	if (size > MEDIUM_STREAM_ARRAY_SIZE)
@@ -1644,7 +1644,7 @@ void xhci_slot_copy(struct xhci_hcd *xhci,
 static int scratchpad_alloc(struct xhci_hcd *xhci, gfp_t flags)
 {
 	int i;
-	struct device *dev = xhci_to_hcd(xhci)->self.controller;
+	struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
 	int num_sp = HCS_MAX_SCRATCHPAD(xhci->hcs_params2);
 
 	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
@@ -1716,7 +1716,7 @@ static void scratchpad_free(struct xhci_hcd *xhci)
 {
 	int num_sp;
 	int i;
-	struct device *dev = xhci_to_hcd(xhci)->self.controller;
+	struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
 
 	if (!xhci->scratchpad)
 		return;
@@ -1792,7 +1792,7 @@ void xhci_free_command(struct xhci_hcd *xhci,
 
 void xhci_mem_cleanup(struct xhci_hcd *xhci)
 {
-	struct device	*dev = xhci_to_hcd(xhci)->self.controller;
+	struct device	*dev = xhci_to_hcd(xhci)->self.sysdev;
 	int size;
 	int i, j, num_ports;
 
@@ -2334,7 +2334,7 @@ static int xhci_setup_port_arrays(struct xhci_hcd *xhci, gfp_t flags)
 int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
 {
 	dma_addr_t	dma;
-	struct device	*dev = xhci_to_hcd(xhci)->self.controller;
+	struct device	*dev = xhci_to_hcd(xhci)->self.sysdev;
 	unsigned int	val, val2;
 	u64		val_64;
 	struct xhci_segment	*seg;
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index ed56bf9..beb95c8 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -14,6 +14,7 @@
 #include <linux/clk.h>
 #include <linux/dma-mapping.h>
 #include <linux/module.h>
+#include <linux/pci.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/usb/phy.h>
@@ -139,6 +140,7 @@ static int xhci_plat_probe(struct platform_device *pdev)
 {
 	const struct of_device_id *match;
 	const struct hc_driver	*driver;
+	struct device		*sysdev;
 	struct xhci_hcd		*xhci;
 	struct resource         *res;
 	struct usb_hcd		*hcd;
@@ -155,22 +157,39 @@ static int xhci_plat_probe(struct platform_device *pdev)
 	if (irq < 0)
 		return -ENODEV;
 
+	/*
+	 * sysdev must point to a device that is known to the system firmware
+	 * or PCI hardware. We handle these three cases here:
+	 * 1. xhci_plat comes from firmware
+	 * 2. xhci_plat is child of a device from firmware (dwc3-plat)
+	 * 3. xhci_plat is grandchild of a pci device (dwc3-pci)
+	 */
+	sysdev = &pdev->dev;
+	if (sysdev->parent && !sysdev->of_node && sysdev->parent->of_node)
+		sysdev = sysdev->parent;
+#ifdef CONFIG_PCI
+	else if (sysdev->parent && sysdev->parent->parent &&
+		 sysdev->parent->parent->bus == &pci_bus_type)
+		sysdev = sysdev->parent->parent;
+#endif
+
 	/* Try to set 64-bit DMA first */
-	if (WARN_ON(!pdev->dev.dma_mask))
+	if (WARN_ON(!sysdev->dma_mask))
 		/* Platform did not initialize dma_mask */
-		ret = dma_coerce_mask_and_coherent(&pdev->dev,
+		ret = dma_coerce_mask_and_coherent(sysdev,
 						   DMA_BIT_MASK(64));
 	else
-		ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+		ret = dma_set_mask_and_coherent(sysdev, DMA_BIT_MASK(64));
 
 	/* If seting 64-bit DMA mask fails, fall back to 32-bit DMA mask */
 	if (ret) {
-		ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+		ret = dma_set_mask_and_coherent(sysdev, DMA_BIT_MASK(32));
 		if (ret)
 			return ret;
 	}
 
-	hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
+	hcd = __usb_create_hcd(driver, sysdev, &pdev->dev,
+			       dev_name(&pdev->dev), NULL);
 	if (!hcd)
 		return -ENOMEM;
 
@@ -220,13 +239,13 @@ static int xhci_plat_probe(struct platform_device *pdev)
 		goto disable_clk;
 	}
 
-	if (device_property_read_bool(&pdev->dev, "usb3-lpm-capable"))
+	if (device_property_read_bool(sysdev, "usb3-lpm-capable"))
 		xhci->quirks |= XHCI_LPM_SUPPORT;
 
 	if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
 		xhci->shared_hcd->can_do_streams = 1;
 
-	hcd->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
+	hcd->usb_phy = devm_usb_get_phy_by_phandle(sysdev, "usb-phy", 0);
 	if (IS_ERR(hcd->usb_phy)) {
 		ret = PTR_ERR(hcd->usb_phy);
 		if (ret == -EPROBE_DEFER)
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 1a4ca02..6ce610b 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -231,6 +231,9 @@ static int xhci_free_msi(struct xhci_hcd *xhci)
 static int xhci_setup_msi(struct xhci_hcd *xhci)
 {
 	int ret;
+	/*
+	 * TODO:Check with MSI Soc for sysdev
+	 */
 	struct pci_dev  *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
 
 	ret = pci_enable_msi(pdev);
@@ -257,7 +260,7 @@ static int xhci_setup_msi(struct xhci_hcd *xhci)
  */
 static void xhci_free_irq(struct xhci_hcd *xhci)
 {
-	struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
+	struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.sysdev);
 	int ret;
 
 	/* return if using legacy interrupt */
@@ -743,7 +746,7 @@ void xhci_shutdown(struct usb_hcd *hcd)
 	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 
 	if (xhci->quirks & XHCI_SPURIOUS_REBOOT)
-		usb_disable_xhci_ports(to_pci_dev(hcd->self.controller));
+		usb_disable_xhci_ports(to_pci_dev(hcd->self.sysdev));
 
 	spin_lock_irq(&xhci->lock);
 	xhci_halt(xhci);
@@ -760,7 +763,7 @@ void xhci_shutdown(struct usb_hcd *hcd)
 
 	/* Yet another workaround for spurious wakeups at shutdown with HSW */
 	if (xhci->quirks & XHCI_SPURIOUS_WAKEUP)
-		pci_set_power_state(to_pci_dev(hcd->self.controller), PCI_D3hot);
+		pci_set_power_state(to_pci_dev(hcd->self.sysdev), PCI_D3hot);
 }
 
 #ifdef CONFIG_PM
@@ -4832,7 +4835,11 @@ int xhci_get_frame(struct usb_hcd *hcd)
 int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
 {
 	struct xhci_hcd		*xhci;
-	struct device		*dev = hcd->self.controller;
+	/*
+	 * TODO: Check with DWC3 clients for sysdev according to
+	 * quirks
+	 */
+	struct device		*dev = hcd->self.sysdev;
 	int			retval;
 
 	/* Accept arbitrarily long scatter-gather lists */
diff --git a/include/linux/usb.h b/include/linux/usb.h
index eba1f10..f3f5d8a 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -354,6 +354,7 @@ struct usb_devmap {
  */
 struct usb_bus {
 	struct device *controller;	/* host/master side hardware */
+	struct device *sysdev;		/* as seen from firmware or bus */
 	int busnum;			/* Bus number (in order of reg) */
 	const char *bus_name;		/* stable id (PCI slot_name etc) */
 	u8 uses_dma;			/* Does the host controller use DMA? */
diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index 66fc137..3860560 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -437,6 +437,9 @@ extern int usb_hcd_alloc_bandwidth(struct usb_device *udev,
 		struct usb_host_interface *new_alt);
 extern int usb_hcd_get_frame_number(struct usb_device *udev);
 
+struct usb_hcd *__usb_create_hcd(const struct hc_driver *driver,
+		struct device *sysdev, struct device *dev, const char *bus_name,
+		struct usb_hcd *primary_hcd);
 extern struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
 		struct device *dev, const char *bus_name);
 extern struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
-- 
2.1.0

Re: [PATCH 1/3] usb: dwc3: host: inherit dma configuration from parent dev

[Peter Chen]

On Tue, Oct 25, 2016 at 04:26:26PM +0530, Sriram Dash wrote:
> For xhci-hcd platform device, all the DMA parameters are not configured
> properly, notably dma ops for dwc3 devices.
> 
> The idea here is that you pass in the parent of_node along with the child
> device pointer, so it would behave exactly like the parent already does.
> The difference is that it also handles all the other attributes besides
> the mask.
> Splitting the usb_bus->controller field into the Linux-internal device
> (used for the sysfs hierarchy, for printks and for power management)
> and a new pointer (used for DMA, DT enumeration and phy lookup) probably
> covers all that we really need.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: Sriram Dash <sriram.dash@nxp.com>
> Cc: Felipe Balbi <felipe.balbi@linux.intel.com>
> Cc: Grygorii Strashko <grygorii.strashko@ti.com>
> Cc: Sinjan Kumar <sinjank@codeaurora.org>
> Cc: David Fisher <david.fisher1@synopsys.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: "Thang Q. Nguyen" <tqnguyen@apm.com>
> Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
> Cc: Stephen Boyd <sboyd@codeaurora.org>
> Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
> Cc: Ming Lei <tom.leiming@gmail.com>
> Cc: Jon Masters <jcm@redhat.com>
> Cc: Dann Frazier <dann.frazier@canonical.com>
> Cc: Peter Chen <peter.chen@nxp.com>
> Cc: Leo Li <pku.leo@gmail.com>
> ---
>  drivers/usb/chipidea/host.c  |  3 ++-
>  drivers/usb/chipidea/udc.c   | 10 +++++----
>  drivers/usb/core/buffer.c    | 12 +++++------
>  drivers/usb/core/hcd.c       | 48 ++++++++++++++++++++++++++------------------
>  drivers/usb/core/usb.c       | 18 ++++++++---------
>  drivers/usb/dwc3/core.c      | 22 +++++++++++++-------
>  drivers/usb/dwc3/core.h      |  1 +
>  drivers/usb/dwc3/ep0.c       |  8 ++++----
>  drivers/usb/dwc3/gadget.c    | 37 +++++++++++++++++-----------------
>  drivers/usb/dwc3/host.c      |  8 ++++----
>  drivers/usb/host/ehci-fsl.c  |  4 ++--
>  drivers/usb/host/xhci-mem.c  | 12 +++++------
>  drivers/usb/host/xhci-plat.c | 33 +++++++++++++++++++++++-------
>  drivers/usb/host/xhci.c      | 15 ++++++++++----
>  include/linux/usb.h          |  1 +
>  include/linux/usb/hcd.h      |  3 +++
>  16 files changed, 144 insertions(+), 91 deletions(-)
> 
> diff --git a/drivers/usb/chipidea/host.c b/drivers/usb/chipidea/host.c
> index 96ae695..ca27893 100644
> --- a/drivers/usb/chipidea/host.c
> +++ b/drivers/usb/chipidea/host.c
> @@ -116,7 +116,8 @@ static int host_start(struct ci_hdrc *ci)
>  	if (usb_disabled())
>  		return -ENODEV;
>  
> -	hcd = usb_create_hcd(&ci_ehci_hc_driver, ci->dev, dev_name(ci->dev));
> +	hcd = __usb_create_hcd(&ci_ehci_hc_driver, ci->dev->parent,
> +			       ci->dev, dev_name(ci->dev), NULL);
>  	if (!hcd)
>  		return -ENOMEM;
>  
> diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
> index 661f43f..bc55922 100644
> --- a/drivers/usb/chipidea/udc.c
> +++ b/drivers/usb/chipidea/udc.c
> @@ -423,7 +423,8 @@ static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
>  
>  	hwreq->req.status = -EALREADY;
>  
> -	ret = usb_gadget_map_request(&ci->gadget, &hwreq->req, hwep->dir);
> +	ret = usb_gadget_map_request_by_dev(ci->dev->parent,
> +					    &hwreq->req, hwep->dir);
>  	if (ret)
>  		return ret;
>  
> @@ -603,7 +604,8 @@ static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
>  		list_del_init(&node->td);
>  	}
>  
> -	usb_gadget_unmap_request(&hwep->ci->gadget, &hwreq->req, hwep->dir);
> +	usb_gadget_unmap_request_by_dev(hwep->ci->dev->parent,
> +					&hwreq->req, hwep->dir);
>  
>  	hwreq->req.actual += actual;
>  
> @@ -1904,13 +1906,13 @@ static int udc_start(struct ci_hdrc *ci)
>  	INIT_LIST_HEAD(&ci->gadget.ep_list);
>  
>  	/* alloc resources */
> -	ci->qh_pool = dma_pool_create("ci_hw_qh", dev,
> +	ci->qh_pool = dma_pool_create("ci_hw_qh", dev->parent,
>  				       sizeof(struct ci_hw_qh),
>  				       64, CI_HDRC_PAGE_SIZE);
>  	if (ci->qh_pool == NULL)
>  		return -ENOMEM;
>  
> -	ci->td_pool = dma_pool_create("ci_hw_td", dev,
> +	ci->td_pool = dma_pool_create("ci_hw_td", dev->parent,
>  				       sizeof(struct ci_hw_td),
>  				       64, CI_HDRC_PAGE_SIZE);

The chipidea part is ok for me, but just follow Arnd's suggestion
for patch split, subject, and commit log.

Peter

>  	if (ci->td_pool == NULL) {
> diff --git a/drivers/usb/core/buffer.c b/drivers/usb/core/buffer.c
> index 98e39f9..1e41ef7 100644
> --- a/drivers/usb/core/buffer.c
> +++ b/drivers/usb/core/buffer.c
> @@ -63,7 +63,7 @@ int hcd_buffer_create(struct usb_hcd *hcd)
>  	int		i, size;
>  
>  	if (!IS_ENABLED(CONFIG_HAS_DMA) ||
> -	    (!hcd->self.controller->dma_mask &&
> +	    (!hcd->self.sysdev->dma_mask &&
>  	     !(hcd->driver->flags & HCD_LOCAL_MEM)))
>  		return 0;
>  
> @@ -72,7 +72,7 @@ int hcd_buffer_create(struct usb_hcd *hcd)
>  		if (!size)
>  			continue;
>  		snprintf(name, sizeof(name), "buffer-%d", size);
> -		hcd->pool[i] = dma_pool_create(name, hcd->self.controller,
> +		hcd->pool[i] = dma_pool_create(name, hcd->self.sysdev,
>  				size, size, 0);
>  		if (!hcd->pool[i]) {
>  			hcd_buffer_destroy(hcd);
> @@ -127,7 +127,7 @@ void *hcd_buffer_alloc(
>  
>  	/* some USB hosts just use PIO */
>  	if (!IS_ENABLED(CONFIG_HAS_DMA) ||
> -	    (!bus->controller->dma_mask &&
> +	    (!bus->sysdev->dma_mask &&
>  	     !(hcd->driver->flags & HCD_LOCAL_MEM))) {
>  		*dma = ~(dma_addr_t) 0;
>  		return kmalloc(size, mem_flags);
> @@ -137,7 +137,7 @@ void *hcd_buffer_alloc(
>  		if (size <= pool_max[i])
>  			return dma_pool_alloc(hcd->pool[i], mem_flags, dma);
>  	}
> -	return dma_alloc_coherent(hcd->self.controller, size, dma, mem_flags);
> +	return dma_alloc_coherent(hcd->self.sysdev, size, dma, mem_flags);
>  }
>  
>  void hcd_buffer_free(
> @@ -154,7 +154,7 @@ void hcd_buffer_free(
>  		return;
>  
>  	if (!IS_ENABLED(CONFIG_HAS_DMA) ||
> -	    (!bus->controller->dma_mask &&
> +	    (!bus->sysdev->dma_mask &&
>  	     !(hcd->driver->flags & HCD_LOCAL_MEM))) {
>  		kfree(addr);
>  		return;
> @@ -166,5 +166,5 @@ void hcd_buffer_free(
>  			return;
>  		}
>  	}
> -	dma_free_coherent(hcd->self.controller, size, addr, dma);
> +	dma_free_coherent(hcd->self.sysdev, size, addr, dma);
>  }
> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
> index 479e223..f8feb08 100644
> --- a/drivers/usb/core/hcd.c
> +++ b/drivers/usb/core/hcd.c
> @@ -1073,6 +1073,7 @@ static void usb_deregister_bus (struct usb_bus *bus)
>  static int register_root_hub(struct usb_hcd *hcd)
>  {
>  	struct device *parent_dev = hcd->self.controller;
> +	struct device *sysdev = hcd->self.sysdev;
>  	struct usb_device *usb_dev = hcd->self.root_hub;
>  	const int devnum = 1;
>  	int retval;
> @@ -1119,7 +1120,7 @@ static int register_root_hub(struct usb_hcd *hcd)
>  		/* Did the HC die before the root hub was registered? */
>  		if (HCD_DEAD(hcd))
>  			usb_hc_died (hcd);	/* This time clean up */
> -		usb_dev->dev.of_node = parent_dev->of_node;
> +		usb_dev->dev.of_node = sysdev->of_node;
>  	}
>  	mutex_unlock(&usb_bus_idr_lock);
>  
> @@ -1465,19 +1466,19 @@ void usb_hcd_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
>  	dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
>  	if (IS_ENABLED(CONFIG_HAS_DMA) &&
>  	    (urb->transfer_flags & URB_DMA_MAP_SG))
> -		dma_unmap_sg(hcd->self.controller,
> +		dma_unmap_sg(hcd->self.sysdev,
>  				urb->sg,
>  				urb->num_sgs,
>  				dir);
>  	else if (IS_ENABLED(CONFIG_HAS_DMA) &&
>  		 (urb->transfer_flags & URB_DMA_MAP_PAGE))
> -		dma_unmap_page(hcd->self.controller,
> +		dma_unmap_page(hcd->self.sysdev,
>  				urb->transfer_dma,
>  				urb->transfer_buffer_length,
>  				dir);
>  	else if (IS_ENABLED(CONFIG_HAS_DMA) &&
>  		 (urb->transfer_flags & URB_DMA_MAP_SINGLE))
> -		dma_unmap_single(hcd->self.controller,
> +		dma_unmap_single(hcd->self.sysdev,
>  				urb->transfer_dma,
>  				urb->transfer_buffer_length,
>  				dir);
> @@ -1520,11 +1521,11 @@ int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
>  			return ret;
>  		if (IS_ENABLED(CONFIG_HAS_DMA) && hcd->self.uses_dma) {
>  			urb->setup_dma = dma_map_single(
> -					hcd->self.controller,
> +					hcd->self.sysdev,
>  					urb->setup_packet,
>  					sizeof(struct usb_ctrlrequest),
>  					DMA_TO_DEVICE);
> -			if (dma_mapping_error(hcd->self.controller,
> +			if (dma_mapping_error(hcd->self.sysdev,
>  						urb->setup_dma))
>  				return -EAGAIN;
>  			urb->transfer_flags |= URB_SETUP_MAP_SINGLE;
> @@ -1555,7 +1556,7 @@ int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
>  				}
>  
>  				n = dma_map_sg(
> -						hcd->self.controller,
> +						hcd->self.sysdev,
>  						urb->sg,
>  						urb->num_sgs,
>  						dir);
> @@ -1570,12 +1571,12 @@ int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
>  			} else if (urb->sg) {
>  				struct scatterlist *sg = urb->sg;
>  				urb->transfer_dma = dma_map_page(
> -						hcd->self.controller,
> +						hcd->self.sysdev,
>  						sg_page(sg),
>  						sg->offset,
>  						urb->transfer_buffer_length,
>  						dir);
> -				if (dma_mapping_error(hcd->self.controller,
> +				if (dma_mapping_error(hcd->self.sysdev,
>  						urb->transfer_dma))
>  					ret = -EAGAIN;
>  				else
> @@ -1585,11 +1586,11 @@ int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
>  				ret = -EAGAIN;
>  			} else {
>  				urb->transfer_dma = dma_map_single(
> -						hcd->self.controller,
> +						hcd->self.sysdev,
>  						urb->transfer_buffer,
>  						urb->transfer_buffer_length,
>  						dir);
> -				if (dma_mapping_error(hcd->self.controller,
> +				if (dma_mapping_error(hcd->self.sysdev,
>  						urb->transfer_dma))
>  					ret = -EAGAIN;
>  				else
> @@ -2511,8 +2512,8 @@ static void init_giveback_urb_bh(struct giveback_urb_bh *bh)
>   * Return: On success, a pointer to the created and initialized HCD structure.
>   * On failure (e.g. if memory is unavailable), %NULL.
>   */
> -struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
> -		struct device *dev, const char *bus_name,
> +struct usb_hcd *__usb_create_hcd(const struct hc_driver *driver,
> +		struct device *sysdev, struct device *dev, const char *bus_name,
>  		struct usb_hcd *primary_hcd)
>  {
>  	struct usb_hcd *hcd;
> @@ -2553,8 +2554,9 @@ struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
>  
>  	usb_bus_init(&hcd->self);
>  	hcd->self.controller = dev;
> +	hcd->self.sysdev = sysdev;
>  	hcd->self.bus_name = bus_name;
> -	hcd->self.uses_dma = (dev->dma_mask != NULL);
> +	hcd->self.uses_dma = (sysdev->dma_mask != NULL);
>  
>  	init_timer(&hcd->rh_timer);
>  	hcd->rh_timer.function = rh_timer_func;
> @@ -2569,6 +2571,14 @@ struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
>  			"USB Host Controller";
>  	return hcd;
>  }
> +EXPORT_SYMBOL_GPL(__usb_create_hcd);
> +
> +struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
> +		struct device *dev, const char *bus_name,
> +		struct usb_hcd *primary_hcd)
> +{
> +	return __usb_create_hcd(driver, dev, dev, bus_name, primary_hcd);
> +}
>  EXPORT_SYMBOL_GPL(usb_create_shared_hcd);
>  
>  /**
> @@ -2588,7 +2598,7 @@ EXPORT_SYMBOL_GPL(usb_create_shared_hcd);
>  struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
>  		struct device *dev, const char *bus_name)
>  {
> -	return usb_create_shared_hcd(driver, dev, bus_name, NULL);
> +	return __usb_create_hcd(driver, dev, dev, bus_name, NULL);
>  }
>  EXPORT_SYMBOL_GPL(usb_create_hcd);
>  
> @@ -2715,7 +2725,7 @@ int usb_add_hcd(struct usb_hcd *hcd,
>  	struct usb_device *rhdev;
>  
>  	if (IS_ENABLED(CONFIG_USB_PHY) && !hcd->usb_phy) {
> -		struct usb_phy *phy = usb_get_phy_dev(hcd->self.controller, 0);
> +		struct usb_phy *phy = usb_get_phy_dev(hcd->self.sysdev, 0);
>  
>  		if (IS_ERR(phy)) {
>  			retval = PTR_ERR(phy);
> @@ -2733,7 +2743,7 @@ int usb_add_hcd(struct usb_hcd *hcd,
>  	}
>  
>  	if (IS_ENABLED(CONFIG_GENERIC_PHY) && !hcd->phy) {
> -		struct phy *phy = phy_get(hcd->self.controller, "usb");
> +		struct phy *phy = phy_get(hcd->self.sysdev, "usb");
>  
>  		if (IS_ERR(phy)) {
>  			retval = PTR_ERR(phy);
> @@ -2781,7 +2791,7 @@ int usb_add_hcd(struct usb_hcd *hcd,
>  	 */
>  	retval = hcd_buffer_create(hcd);
>  	if (retval != 0) {
> -		dev_dbg(hcd->self.controller, "pool alloc failed\n");
> +		dev_dbg(hcd->self.sysdev, "pool alloc failed\n");
>  		goto err_create_buf;
>  	}
>  
> @@ -2791,7 +2801,7 @@ int usb_add_hcd(struct usb_hcd *hcd,
>  
>  	rhdev = usb_alloc_dev(NULL, &hcd->self, 0);
>  	if (rhdev == NULL) {
> -		dev_err(hcd->self.controller, "unable to allocate root hub\n");
> +		dev_err(hcd->self.sysdev, "unable to allocate root hub\n");
>  		retval = -ENOMEM;
>  		goto err_allocate_root_hub;
>  	}
> diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
> index 5921514..3abe83a 100644
> --- a/drivers/usb/core/usb.c
> +++ b/drivers/usb/core/usb.c
> @@ -450,9 +450,9 @@ struct usb_device *usb_alloc_dev(struct usb_device *parent,
>  	 * Note: calling dma_set_mask() on a USB device would set the
>  	 * mask for the entire HCD, so don't do that.
>  	 */
> -	dev->dev.dma_mask = bus->controller->dma_mask;
> -	dev->dev.dma_pfn_offset = bus->controller->dma_pfn_offset;
> -	set_dev_node(&dev->dev, dev_to_node(bus->controller));
> +	dev->dev.dma_mask = bus->sysdev->dma_mask;
> +	dev->dev.dma_pfn_offset = bus->sysdev->dma_pfn_offset;
> +	set_dev_node(&dev->dev, dev_to_node(bus->sysdev));
>  	dev->state = USB_STATE_ATTACHED;
>  	dev->lpm_disable_count = 1;
>  	atomic_set(&dev->urbnum, 0);
> @@ -800,7 +800,7 @@ struct urb *usb_buffer_map(struct urb *urb)
>  	if (!urb
>  			|| !urb->dev
>  			|| !(bus = urb->dev->bus)
> -			|| !(controller = bus->controller))
> +			|| !(controller = bus->sysdev))
>  		return NULL;
>  
>  	if (controller->dma_mask) {
> @@ -838,7 +838,7 @@ void usb_buffer_dmasync(struct urb *urb)
>  			|| !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)
>  			|| !urb->dev
>  			|| !(bus = urb->dev->bus)
> -			|| !(controller = bus->controller))
> +			|| !(controller = bus->sysdev))
>  		return;
>  
>  	if (controller->dma_mask) {
> @@ -872,7 +872,7 @@ void usb_buffer_unmap(struct urb *urb)
>  			|| !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)
>  			|| !urb->dev
>  			|| !(bus = urb->dev->bus)
> -			|| !(controller = bus->controller))
> +			|| !(controller = bus->sysdev))
>  		return;
>  
>  	if (controller->dma_mask) {
> @@ -922,7 +922,7 @@ int usb_buffer_map_sg(const struct usb_device *dev, int is_in,
>  
>  	if (!dev
>  			|| !(bus = dev->bus)
> -			|| !(controller = bus->controller)
> +			|| !(controller = bus->sysdev)
>  			|| !controller->dma_mask)
>  		return -EINVAL;
>  
> @@ -958,7 +958,7 @@ void usb_buffer_dmasync_sg(const struct usb_device *dev, int is_in,
>  
>  	if (!dev
>  			|| !(bus = dev->bus)
> -			|| !(controller = bus->controller)
> +			|| !(controller = bus->sysdev)
>  			|| !controller->dma_mask)
>  		return;
>  
> @@ -986,7 +986,7 @@ void usb_buffer_unmap_sg(const struct usb_device *dev, int is_in,
>  
>  	if (!dev
>  			|| !(bus = dev->bus)
> -			|| !(controller = bus->controller)
> +			|| !(controller = bus->sysdev)
>  			|| !controller->dma_mask)
>  		return;
>  
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 7287a76..e0f64ef 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -25,6 +25,7 @@
>  #include <linux/slab.h>
>  #include <linux/spinlock.h>
>  #include <linux/platform_device.h>
> +#include <linux/pci.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/interrupt.h>
>  #include <linux/ioport.h>
> @@ -229,7 +230,7 @@ static void dwc3_frame_length_adjustment(struct dwc3 *dwc)
>  static void dwc3_free_one_event_buffer(struct dwc3 *dwc,
>  		struct dwc3_event_buffer *evt)
>  {
> -	dma_free_coherent(dwc->dev, evt->length, evt->buf, evt->dma);
> +	dma_free_coherent(dwc->sysdev, evt->length, evt->buf, evt->dma);
>  }
>  
>  /**
> @@ -251,7 +252,7 @@ static struct dwc3_event_buffer *dwc3_alloc_one_event_buffer(struct dwc3 *dwc,
>  
>  	evt->dwc	= dwc;
>  	evt->length	= length;
> -	evt->buf	= dma_alloc_coherent(dwc->dev, length,
> +	evt->buf	= dma_alloc_coherent(dwc->sysdev, length,
>  			&evt->dma, GFP_KERNEL);
>  	if (!evt->buf)
>  		return ERR_PTR(-ENOMEM);
> @@ -370,11 +371,11 @@ static int dwc3_setup_scratch_buffers(struct dwc3 *dwc)
>  	if (!WARN_ON(dwc->scratchbuf))
>  		return 0;
>  
> -	scratch_addr = dma_map_single(dwc->dev, dwc->scratchbuf,
> +	scratch_addr = dma_map_single(dwc->sysdev, dwc->scratchbuf,
>  			dwc->nr_scratch * DWC3_SCRATCHBUF_SIZE,
>  			DMA_BIDIRECTIONAL);
> -	if (dma_mapping_error(dwc->dev, scratch_addr)) {
> -		dev_err(dwc->dev, "failed to map scratch buffer\n");
> +	if (dma_mapping_error(dwc->sysdev, scratch_addr)) {
> +		dev_err(dwc->sysdev, "failed to map scratch buffer\n");
>  		ret = -EFAULT;
>  		goto err0;
>  	}
> @@ -398,7 +399,7 @@ static int dwc3_setup_scratch_buffers(struct dwc3 *dwc)
>  	return 0;
>  
>  err1:
> -	dma_unmap_single(dwc->dev, dwc->scratch_addr, dwc->nr_scratch *
> +	dma_unmap_single(dwc->sysdev, dwc->scratch_addr, dwc->nr_scratch *
>  			DWC3_SCRATCHBUF_SIZE, DMA_BIDIRECTIONAL);
>  
>  err0:
> @@ -417,7 +418,7 @@ static void dwc3_free_scratch_buffers(struct dwc3 *dwc)
>  	if (!WARN_ON(dwc->scratchbuf))
>  		return;
>  
> -	dma_unmap_single(dwc->dev, dwc->scratch_addr, dwc->nr_scratch *
> +	dma_unmap_single(dwc->sysdev, dwc->scratch_addr, dwc->nr_scratch *
>  			DWC3_SCRATCHBUF_SIZE, DMA_BIDIRECTIONAL);
>  	kfree(dwc->scratchbuf);
>  }
> @@ -943,6 +944,13 @@ static int dwc3_probe(struct platform_device *pdev)
>  	dwc = PTR_ALIGN(mem, DWC3_ALIGN_MASK + 1);
>  	dwc->mem = mem;
>  	dwc->dev = dev;
> +#ifdef CONFIG_PCI
> +	/* TODO: or some other way of detecting this? */
> +	if (dwc->dev->parent && dwc->dev->parent->bus == &pci_bus_type)
> +		dwc->sysdev = dwc->dev->parent;
> +	else
> +#endif
> +		dwc->sysdev = dwc->dev;
>  
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	if (!res) {
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index 6b60e42..b166b0a 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -851,6 +851,7 @@ struct dwc3 {
>  	spinlock_t		lock;
>  
>  	struct device		*dev;
> +	struct device		*sysdev;
>  
>  	struct platform_device	*xhci;
>  	struct resource		xhci_resources[DWC3_XHCI_RESOURCES_NUM];
> diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
> index fe79d77..4d13723 100644
> --- a/drivers/usb/dwc3/ep0.c
> +++ b/drivers/usb/dwc3/ep0.c
> @@ -974,8 +974,8 @@ static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
>  		u32	transfer_size = 0;
>  		u32	maxpacket;
>  
> -		ret = usb_gadget_map_request(&dwc->gadget, &req->request,
> -				dep->number);
> +		ret = usb_gadget_map_request_by_dev(dwc->sysdev,
> +				&req->request, dep->number);
>  		if (ret) {
>  			dwc3_trace(trace_dwc3_ep0, "failed to map request");
>  			return;
> @@ -1002,8 +1002,8 @@ static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
>  				dwc->ep0_bounce_addr, transfer_size,
>  				DWC3_TRBCTL_CONTROL_DATA, false);
>  	} else {
> -		ret = usb_gadget_map_request(&dwc->gadget, &req->request,
> -				dep->number);
> +		ret = usb_gadget_map_request_by_dev(dwc->sysdev,
> +				&req->request, dep->number);
>  		if (ret) {
>  			dwc3_trace(trace_dwc3_ep0, "failed to map request");
>  			return;
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index 07cc892..35375f4 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -185,8 +185,8 @@ void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
>  	if (dwc->ep0_bounced && dep->number == 0)
>  		dwc->ep0_bounced = false;
>  	else
> -		usb_gadget_unmap_request(&dwc->gadget, &req->request,
> -				req->direction);
> +		usb_gadget_unmap_request_by_dev(dwc->sysdev,
> +				&req->request, req->direction);
>  
>  	trace_dwc3_gadget_giveback(req);
>  
> @@ -365,7 +365,7 @@ static int dwc3_alloc_trb_pool(struct dwc3_ep *dep)
>  	if (dep->trb_pool)
>  		return 0;
>  
> -	dep->trb_pool = dma_alloc_coherent(dwc->dev,
> +	dep->trb_pool = dma_alloc_coherent(dwc->sysdev,
>  			sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
>  			&dep->trb_pool_dma, GFP_KERNEL);
>  	if (!dep->trb_pool) {
> @@ -381,7 +381,7 @@ static void dwc3_free_trb_pool(struct dwc3_ep *dep)
>  {
>  	struct dwc3		*dwc = dep->dwc;
>  
> -	dma_free_coherent(dwc->dev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
> +	dma_free_coherent(dwc->sysdev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
>  			dep->trb_pool, dep->trb_pool_dma);
>  
>  	dep->trb_pool = NULL;
> @@ -990,8 +990,8 @@ static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep, u16 cmd_param)
>  		 * here and stop, unmap, free and del each of the linked
>  		 * requests instead of what we do now.
>  		 */
> -		usb_gadget_unmap_request(&dwc->gadget, &req->request,
> -				req->direction);
> +		usb_gadget_unmap_request_by_dev(dwc->sysdev,
> +				&req->request, req->direction);
>  		list_del(&req->list);
>  		return ret;
>  	}
> @@ -1064,8 +1064,8 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
>  
>  	trace_dwc3_ep_queue(req);
>  
> -	ret = usb_gadget_map_request(&dwc->gadget, &req->request,
> -			dep->direction);
> +	ret = usb_gadget_map_request_by_dev(dwc->sysdev, &req->request,
> +					    dep->direction);
>  	if (ret)
>  		return ret;
>  
> @@ -2879,7 +2879,7 @@ int dwc3_gadget_init(struct dwc3 *dwc)
>  
>  	dwc->irq_gadget = irq;
>  
> -	dwc->ctrl_req = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
> +	dwc->ctrl_req = dma_alloc_coherent(dwc->sysdev, sizeof(*dwc->ctrl_req),
>  			&dwc->ctrl_req_addr, GFP_KERNEL);
>  	if (!dwc->ctrl_req) {
>  		dev_err(dwc->dev, "failed to allocate ctrl request\n");
> @@ -2887,8 +2887,9 @@ int dwc3_gadget_init(struct dwc3 *dwc)
>  		goto err0;
>  	}
>  
> -	dwc->ep0_trb = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ep0_trb) * 2,
> -			&dwc->ep0_trb_addr, GFP_KERNEL);
> +	dwc->ep0_trb = dma_alloc_coherent(dwc->sysdev,
> +					  sizeof(*dwc->ep0_trb) * 2,
> +					  &dwc->ep0_trb_addr, GFP_KERNEL);
>  	if (!dwc->ep0_trb) {
>  		dev_err(dwc->dev, "failed to allocate ep0 trb\n");
>  		ret = -ENOMEM;
> @@ -2901,7 +2902,7 @@ int dwc3_gadget_init(struct dwc3 *dwc)
>  		goto err2;
>  	}
>  
> -	dwc->ep0_bounce = dma_alloc_coherent(dwc->dev,
> +	dwc->ep0_bounce = dma_alloc_coherent(dwc->sysdev,
>  			DWC3_EP0_BOUNCE_SIZE, &dwc->ep0_bounce_addr,
>  			GFP_KERNEL);
>  	if (!dwc->ep0_bounce) {
> @@ -2973,18 +2974,18 @@ int dwc3_gadget_init(struct dwc3 *dwc)
>  
>  err4:
>  	dwc3_gadget_free_endpoints(dwc);
> -	dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
> +	dma_free_coherent(dwc->sysdev, DWC3_EP0_BOUNCE_SIZE,
>  			dwc->ep0_bounce, dwc->ep0_bounce_addr);
>  
>  err3:
>  	kfree(dwc->setup_buf);
>  
>  err2:
> -	dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
> +	dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb),
>  			dwc->ep0_trb, dwc->ep0_trb_addr);
>  
>  err1:
> -	dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
> +	dma_free_coherent(dwc->sysdev, sizeof(*dwc->ctrl_req),
>  			dwc->ctrl_req, dwc->ctrl_req_addr);
>  
>  err0:
> @@ -2999,16 +3000,16 @@ void dwc3_gadget_exit(struct dwc3 *dwc)
>  
>  	dwc3_gadget_free_endpoints(dwc);
>  
> -	dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
> +	dma_free_coherent(dwc->sysdev, DWC3_EP0_BOUNCE_SIZE,
>  			dwc->ep0_bounce, dwc->ep0_bounce_addr);
>  
>  	kfree(dwc->setup_buf);
>  	kfree(dwc->zlp_buf);
>  
> -	dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
> +	dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb),
>  			dwc->ep0_trb, dwc->ep0_trb_addr);
>  
> -	dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
> +	dma_free_coherent(dwc->sysdev, sizeof(*dwc->ctrl_req),
>  			dwc->ctrl_req, dwc->ctrl_req_addr);
>  }
>  
> diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
> index f6533c6..bb83eee 100644
> --- a/drivers/usb/dwc3/host.c
> +++ b/drivers/usb/dwc3/host.c
> @@ -112,9 +112,9 @@ int dwc3_host_init(struct dwc3 *dwc)
>  	return 0;
>  err2:
>  	phy_remove_lookup(dwc->usb2_generic_phy, "usb2-phy",
> -			  dev_name(&xhci->dev));
> +			  dev_name(dwc->dev));
>  	phy_remove_lookup(dwc->usb3_generic_phy, "usb3-phy",
> -			  dev_name(&xhci->dev));
> +			  dev_name(dwc->dev));
>  err1:
>  	platform_device_put(xhci);
>  	return ret;
> @@ -123,8 +123,8 @@ int dwc3_host_init(struct dwc3 *dwc)
>  void dwc3_host_exit(struct dwc3 *dwc)
>  {
>  	phy_remove_lookup(dwc->usb2_generic_phy, "usb2-phy",
> -			  dev_name(&dwc->xhci->dev));
> +			  dev_name(dwc->dev));
>  	phy_remove_lookup(dwc->usb3_generic_phy, "usb3-phy",
> -			  dev_name(&dwc->xhci->dev));
> +			  dev_name(dwc->dev));
>  	platform_device_unregister(dwc->xhci);
>  }
> diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
> index 9f5ffb6..b241995 100644
> --- a/drivers/usb/host/ehci-fsl.c
> +++ b/drivers/usb/host/ehci-fsl.c
> @@ -96,8 +96,8 @@ static int fsl_ehci_drv_probe(struct platform_device *pdev)
>  	}
>  	irq = res->start;
>  
> -	hcd = usb_create_hcd(&fsl_ehci_hc_driver, &pdev->dev,
> -				dev_name(&pdev->dev));
> +	hcd = __usb_create_hcd(&fsl_ehci_hc_driver, &pdev->dev.parent,
> +				&pdev->dev, dev_name(&pdev->dev), NULL);
>  	if (!hcd) {
>  		retval = -ENOMEM;
>  		goto err1;
> diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
> index 6afe323..79608df 100644
> --- a/drivers/usb/host/xhci-mem.c
> +++ b/drivers/usb/host/xhci-mem.c
> @@ -586,7 +586,7 @@ static void xhci_free_stream_ctx(struct xhci_hcd *xhci,
>  		unsigned int num_stream_ctxs,
>  		struct xhci_stream_ctx *stream_ctx, dma_addr_t dma)
>  {
> -	struct device *dev = xhci_to_hcd(xhci)->self.controller;
> +	struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
>  	size_t size = sizeof(struct xhci_stream_ctx) * num_stream_ctxs;
>  
>  	if (size > MEDIUM_STREAM_ARRAY_SIZE)
> @@ -614,7 +614,7 @@ static struct xhci_stream_ctx *xhci_alloc_stream_ctx(struct xhci_hcd *xhci,
>  		unsigned int num_stream_ctxs, dma_addr_t *dma,
>  		gfp_t mem_flags)
>  {
> -	struct device *dev = xhci_to_hcd(xhci)->self.controller;
> +	struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
>  	size_t size = sizeof(struct xhci_stream_ctx) * num_stream_ctxs;
>  
>  	if (size > MEDIUM_STREAM_ARRAY_SIZE)
> @@ -1644,7 +1644,7 @@ void xhci_slot_copy(struct xhci_hcd *xhci,
>  static int scratchpad_alloc(struct xhci_hcd *xhci, gfp_t flags)
>  {
>  	int i;
> -	struct device *dev = xhci_to_hcd(xhci)->self.controller;
> +	struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
>  	int num_sp = HCS_MAX_SCRATCHPAD(xhci->hcs_params2);
>  
>  	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
> @@ -1716,7 +1716,7 @@ static void scratchpad_free(struct xhci_hcd *xhci)
>  {
>  	int num_sp;
>  	int i;
> -	struct device *dev = xhci_to_hcd(xhci)->self.controller;
> +	struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
>  
>  	if (!xhci->scratchpad)
>  		return;
> @@ -1792,7 +1792,7 @@ void xhci_free_command(struct xhci_hcd *xhci,
>  
>  void xhci_mem_cleanup(struct xhci_hcd *xhci)
>  {
> -	struct device	*dev = xhci_to_hcd(xhci)->self.controller;
> +	struct device	*dev = xhci_to_hcd(xhci)->self.sysdev;
>  	int size;
>  	int i, j, num_ports;
>  
> @@ -2334,7 +2334,7 @@ static int xhci_setup_port_arrays(struct xhci_hcd *xhci, gfp_t flags)
>  int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
>  {
>  	dma_addr_t	dma;
> -	struct device	*dev = xhci_to_hcd(xhci)->self.controller;
> +	struct device	*dev = xhci_to_hcd(xhci)->self.sysdev;
>  	unsigned int	val, val2;
>  	u64		val_64;
>  	struct xhci_segment	*seg;
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index ed56bf9..beb95c8 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -14,6 +14,7 @@
>  #include <linux/clk.h>
>  #include <linux/dma-mapping.h>
>  #include <linux/module.h>
> +#include <linux/pci.h>
>  #include <linux/of.h>
>  #include <linux/platform_device.h>
>  #include <linux/usb/phy.h>
> @@ -139,6 +140,7 @@ static int xhci_plat_probe(struct platform_device *pdev)
>  {
>  	const struct of_device_id *match;
>  	const struct hc_driver	*driver;
> +	struct device		*sysdev;
>  	struct xhci_hcd		*xhci;
>  	struct resource         *res;
>  	struct usb_hcd		*hcd;
> @@ -155,22 +157,39 @@ static int xhci_plat_probe(struct platform_device *pdev)
>  	if (irq < 0)
>  		return -ENODEV;
>  
> +	/*
> +	 * sysdev must point to a device that is known to the system firmware
> +	 * or PCI hardware. We handle these three cases here:
> +	 * 1. xhci_plat comes from firmware
> +	 * 2. xhci_plat is child of a device from firmware (dwc3-plat)
> +	 * 3. xhci_plat is grandchild of a pci device (dwc3-pci)
> +	 */
> +	sysdev = &pdev->dev;
> +	if (sysdev->parent && !sysdev->of_node && sysdev->parent->of_node)
> +		sysdev = sysdev->parent;
> +#ifdef CONFIG_PCI
> +	else if (sysdev->parent && sysdev->parent->parent &&
> +		 sysdev->parent->parent->bus == &pci_bus_type)
> +		sysdev = sysdev->parent->parent;
> +#endif
> +
>  	/* Try to set 64-bit DMA first */
> -	if (WARN_ON(!pdev->dev.dma_mask))
> +	if (WARN_ON(!sysdev->dma_mask))
>  		/* Platform did not initialize dma_mask */
> -		ret = dma_coerce_mask_and_coherent(&pdev->dev,
> +		ret = dma_coerce_mask_and_coherent(sysdev,
>  						   DMA_BIT_MASK(64));
>  	else
> -		ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
> +		ret = dma_set_mask_and_coherent(sysdev, DMA_BIT_MASK(64));
>  
>  	/* If seting 64-bit DMA mask fails, fall back to 32-bit DMA mask */
>  	if (ret) {
> -		ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
> +		ret = dma_set_mask_and_coherent(sysdev, DMA_BIT_MASK(32));
>  		if (ret)
>  			return ret;
>  	}
>  
> -	hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
> +	hcd = __usb_create_hcd(driver, sysdev, &pdev->dev,
> +			       dev_name(&pdev->dev), NULL);
>  	if (!hcd)
>  		return -ENOMEM;
>  
> @@ -220,13 +239,13 @@ static int xhci_plat_probe(struct platform_device *pdev)
>  		goto disable_clk;
>  	}
>  
> -	if (device_property_read_bool(&pdev->dev, "usb3-lpm-capable"))
> +	if (device_property_read_bool(sysdev, "usb3-lpm-capable"))
>  		xhci->quirks |= XHCI_LPM_SUPPORT;
>  
>  	if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
>  		xhci->shared_hcd->can_do_streams = 1;
>  
> -	hcd->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
> +	hcd->usb_phy = devm_usb_get_phy_by_phandle(sysdev, "usb-phy", 0);
>  	if (IS_ERR(hcd->usb_phy)) {
>  		ret = PTR_ERR(hcd->usb_phy);
>  		if (ret == -EPROBE_DEFER)
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> index 1a4ca02..6ce610b 100644
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
> @@ -231,6 +231,9 @@ static int xhci_free_msi(struct xhci_hcd *xhci)
>  static int xhci_setup_msi(struct xhci_hcd *xhci)
>  {
>  	int ret;
> +	/*
> +	 * TODO:Check with MSI Soc for sysdev
> +	 */
>  	struct pci_dev  *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
>  
>  	ret = pci_enable_msi(pdev);
> @@ -257,7 +260,7 @@ static int xhci_setup_msi(struct xhci_hcd *xhci)
>   */
>  static void xhci_free_irq(struct xhci_hcd *xhci)
>  {
> -	struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
> +	struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.sysdev);
>  	int ret;
>  
>  	/* return if using legacy interrupt */
> @@ -743,7 +746,7 @@ void xhci_shutdown(struct usb_hcd *hcd)
>  	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
>  
>  	if (xhci->quirks & XHCI_SPURIOUS_REBOOT)
> -		usb_disable_xhci_ports(to_pci_dev(hcd->self.controller));
> +		usb_disable_xhci_ports(to_pci_dev(hcd->self.sysdev));
>  
>  	spin_lock_irq(&xhci->lock);
>  	xhci_halt(xhci);
> @@ -760,7 +763,7 @@ void xhci_shutdown(struct usb_hcd *hcd)
>  
>  	/* Yet another workaround for spurious wakeups at shutdown with HSW */
>  	if (xhci->quirks & XHCI_SPURIOUS_WAKEUP)
> -		pci_set_power_state(to_pci_dev(hcd->self.controller), PCI_D3hot);
> +		pci_set_power_state(to_pci_dev(hcd->self.sysdev), PCI_D3hot);
>  }
>  
>  #ifdef CONFIG_PM
> @@ -4832,7 +4835,11 @@ int xhci_get_frame(struct usb_hcd *hcd)
>  int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
>  {
>  	struct xhci_hcd		*xhci;
> -	struct device		*dev = hcd->self.controller;
> +	/*
> +	 * TODO: Check with DWC3 clients for sysdev according to
> +	 * quirks
> +	 */
> +	struct device		*dev = hcd->self.sysdev;
>  	int			retval;
>  
>  	/* Accept arbitrarily long scatter-gather lists */
> diff --git a/include/linux/usb.h b/include/linux/usb.h
> index eba1f10..f3f5d8a 100644
> --- a/include/linux/usb.h
> +++ b/include/linux/usb.h
> @@ -354,6 +354,7 @@ struct usb_devmap {
>   */
>  struct usb_bus {
>  	struct device *controller;	/* host/master side hardware */
> +	struct device *sysdev;		/* as seen from firmware or bus */
>  	int busnum;			/* Bus number (in order of reg) */
>  	const char *bus_name;		/* stable id (PCI slot_name etc) */
>  	u8 uses_dma;			/* Does the host controller use DMA? */
> diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
> index 66fc137..3860560 100644
> --- a/include/linux/usb/hcd.h
> +++ b/include/linux/usb/hcd.h
> @@ -437,6 +437,9 @@ extern int usb_hcd_alloc_bandwidth(struct usb_device *udev,
>  		struct usb_host_interface *new_alt);
>  extern int usb_hcd_get_frame_number(struct usb_device *udev);
>  
> +struct usb_hcd *__usb_create_hcd(const struct hc_driver *driver,
> +		struct device *sysdev, struct device *dev, const char *bus_name,
> +		struct usb_hcd *primary_hcd);
>  extern struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
>  		struct device *dev, const char *bus_name);
>  extern struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
> -- 
> 2.1.0
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-usb" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

-- 

Best Regards,
Peter Chen

[PATCH 2/3] usb: dwc3: host: Do not use dma_set_coherent_mask

[Sriram Dash]

Do not require dma_set_coherent_mask for hcd

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/usb/chipidea/core.c | 3 ---
 drivers/usb/dwc3/core.c     | 6 ------
 drivers/usb/dwc3/dwc3-st.c  | 1 -
 drivers/usb/dwc3/host.c     | 4 ----
 4 files changed, 14 deletions(-)

diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index 69426e6..8917a03 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -833,9 +833,6 @@ struct platform_device *ci_hdrc_add_device(struct device *dev,
 	}
 
 	pdev->dev.parent = dev;
-	pdev->dev.dma_mask = dev->dma_mask;
-	pdev->dev.dma_parms = dev->dma_parms;
-	dma_set_coherent_mask(&pdev->dev, dev->coherent_dma_mask);
 
 	ret = platform_device_add_resources(pdev, res, nres);
 	if (ret)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index e0f64ef..0af0dc0 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1059,12 +1059,6 @@ static int dwc3_probe(struct platform_device *pdev)
 
 	spin_lock_init(&dwc->lock);
 
-	if (!dev->dma_mask) {
-		dev->dma_mask = dev->parent->dma_mask;
-		dev->dma_parms = dev->parent->dma_parms;
-		dma_set_coherent_mask(dev, dev->parent->coherent_dma_mask);
-	}
-
 	pm_runtime_set_active(dev);
 	pm_runtime_use_autosuspend(dev);
 	pm_runtime_set_autosuspend_delay(dev, DWC3_DEFAULT_AUTOSUSPEND_DELAY);
diff --git a/drivers/usb/dwc3/dwc3-st.c b/drivers/usb/dwc3/dwc3-st.c
index 89a2f71..4d7439c 100644
--- a/drivers/usb/dwc3/dwc3-st.c
+++ b/drivers/usb/dwc3/dwc3-st.c
@@ -218,7 +218,6 @@ static int st_dwc3_probe(struct platform_device *pdev)
 	if (IS_ERR(regmap))
 		return PTR_ERR(regmap);
 
-	dma_set_coherent_mask(dev, dev->coherent_dma_mask);
 	dwc3_data->dev = dev;
 	dwc3_data->regmap = regmap;
 
diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
index bb83eee..045ec27 100644
--- a/drivers/usb/dwc3/host.c
+++ b/drivers/usb/dwc3/host.c
@@ -72,11 +72,7 @@ int dwc3_host_init(struct dwc3 *dwc)
 		return -ENOMEM;
 	}
 
-	dma_set_coherent_mask(&xhci->dev, dwc->dev->coherent_dma_mask);
-
 	xhci->dev.parent	= dwc->dev;
-	xhci->dev.dma_mask	= dwc->dev->dma_mask;
-	xhci->dev.dma_parms	= dwc->dev->dma_parms;
 
 	dwc->xhci = xhci;
 
-- 
2.1.0

Re: [PATCH 2/3] usb: dwc3: host: Do not use dma_set_coherent_mask

[Arnd Bergmann]

On Tuesday, October 25, 2016 4:26:27 PM CEST Sriram Dash wrote:
> Do not require dma_set_coherent_mask for hcd
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Aside from the comments I had for patch 3, you are doing two
different things here:

> diff --git a/drivers/usb/dwc3/dwc3-st.c b/drivers/usb/dwc3/dwc3-st.c
> index 89a2f71..4d7439c 100644
> --- a/drivers/usb/dwc3/dwc3-st.c
> +++ b/drivers/usb/dwc3/dwc3-st.c
> @@ -218,7 +218,6 @@ static int st_dwc3_probe(struct platform_device *pdev)
>  	if (IS_ERR(regmap))
>  		return PTR_ERR(regmap);
>  
> -	dma_set_coherent_mask(dev, dev->coherent_dma_mask);
>  	dwc3_data->dev = dev;
>  	dwc3_data->regmap = regmap;
>  

This one was setting the mask for the device itself (incorrectly),
so it can be removed along with the dma_coerce_mask_and_coherent()
call in dwc3_exynos_probe, or as a separate patch. It is an
independent cleanup.

> --- a/drivers/usb/chipidea/core.c
> +++ b/drivers/usb/chipidea/core.c
> @@ -833,9 +833,6 @@ struct platform_device *ci_hdrc_add_device(struct device *dev,
>
> -	dma_set_coherent_mask(&pdev->dev, dev->coherent_dma_mask);
>  
>  	ret = platform_device_add_resources(pdev, res, nres);
>  	if (ret)

> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -1059,12 +1059,6 @@ static int dwc3_probe(struct platform_device *pdev)
>  
>  	spin_lock_init(&dwc->lock);
>  
> -		dma_set_coherent_mask(dev, dev->parent->coherent_dma_mask);

> --- a/drivers/usb/dwc3/host.c
> +++ b/drivers/usb/dwc3/host.c
> @@ -72,11 +72,7 @@ int dwc3_host_init(struct dwc3 *dwc)
>  		return -ENOMEM;
>  	}
>  
> -	dma_set_coherent_mask(&xhci->dev, dwc->dev->coherent_dma_mask);
> -

These three all set the mask for the *child* devices, as
that is no longer needed after the change in patch 1/3.
I'd suggest leaving those changes together with the rest of
that patch.

However, it's probably better to split up that patch along the
boundaries of the drivers, starting with the USB core:

1/4 usb: separate out sysdev pointer from usb_bus
2/4 usb: chipidea: use bus->sysdev for DMA configuration
3/4 usb: xhci: use bus->sysdev for DMA configuration
4/4 usb: dwc3: use bus->sysdev for DMA configuration

	Arnd

RE: [PATCH 2/3] usb: dwc3: host: Do not use dma_set_coherent_mask

[Sriram Dash]

>From: Arnd Bergmann [mailto:arnd@arndb.de]
>On Tuesday, October 25, 2016 4:26:27 PM CEST Sriram Dash wrote:
>> Do not require dma_set_coherent_mask for hcd
>>
>> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
>
>Aside from the comments I had for patch 3, you are doing two different things
>here:
>
>> diff --git a/drivers/usb/dwc3/dwc3-st.c b/drivers/usb/dwc3/dwc3-st.c
>> index 89a2f71..4d7439c 100644
>> --- a/drivers/usb/dwc3/dwc3-st.c
>> +++ b/drivers/usb/dwc3/dwc3-st.c
>> @@ -218,7 +218,6 @@ static int st_dwc3_probe(struct platform_device *pdev)
>>  	if (IS_ERR(regmap))
>>  		return PTR_ERR(regmap);
>>
>> -	dma_set_coherent_mask(dev, dev->coherent_dma_mask);
>>  	dwc3_data->dev = dev;
>>  	dwc3_data->regmap = regmap;
>>
>
>This one was setting the mask for the device itself (incorrectly), so it can be
>removed along with the dma_coerce_mask_and_coherent() call in
>dwc3_exynos_probe, or as a separate patch. It is an independent cleanup.
>
>> --- a/drivers/usb/chipidea/core.c
>> +++ b/drivers/usb/chipidea/core.c
>> @@ -833,9 +833,6 @@ struct platform_device *ci_hdrc_add_device(struct
>> device *dev,
>>
>> -	dma_set_coherent_mask(&pdev->dev, dev->coherent_dma_mask);
>>
>>  	ret = platform_device_add_resources(pdev, res, nres);
>>  	if (ret)
>
>> --- a/drivers/usb/dwc3/core.c
>> +++ b/drivers/usb/dwc3/core.c
>> @@ -1059,12 +1059,6 @@ static int dwc3_probe(struct platform_device
>> *pdev)
>>
>>  	spin_lock_init(&dwc->lock);
>>
>> -		dma_set_coherent_mask(dev, dev->parent-
>>coherent_dma_mask);
>
>> --- a/drivers/usb/dwc3/host.c
>> +++ b/drivers/usb/dwc3/host.c
>> @@ -72,11 +72,7 @@ int dwc3_host_init(struct dwc3 *dwc)
>>  		return -ENOMEM;
>>  	}
>>
>> -	dma_set_coherent_mask(&xhci->dev, dwc->dev->coherent_dma_mask);
>> -
>
>These three all set the mask for the *child* devices, as that is no longer needed
>after the change in patch 1/3.
>I'd suggest leaving those changes together with the rest of that patch.
>
>However, it's probably better to split up that patch along the boundaries of the
>drivers, starting with the USB core:
>

Ok. Will do the needful in the next version.

>1/4 usb: separate out sysdev pointer from usb_bus
>2/4 usb: chipidea: use bus->sysdev for DMA configuration
>3/4 usb: xhci: use bus->sysdev for DMA configuration
>4/4 usb: dwc3: use bus->sysdev for DMA configuration
>
>	Arnd

[PATCH 3/3] usb: dwc3: host: Do not use dma_coerce_mask_and_coherent

[Sriram Dash]

Do not use dma_coerce_mask_and_coherent for hcd.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/usb/dwc3/dwc3-exynos.c | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-exynos.c b/drivers/usb/dwc3/dwc3-exynos.c
index 2f1fb7e..e27899b 100644
--- a/drivers/usb/dwc3/dwc3-exynos.c
+++ b/drivers/usb/dwc3/dwc3-exynos.c
@@ -20,7 +20,6 @@
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/platform_device.h>
-#include <linux/dma-mapping.h>
 #include <linux/clk.h>
 #include <linux/usb/otg.h>
 #include <linux/usb/usb_phy_generic.h>
@@ -117,15 +116,6 @@ static int dwc3_exynos_probe(struct platform_device *pdev)
 	if (!exynos)
 		return -ENOMEM;
 
-	/*
-	 * Right now device-tree probed devices don't get dma_mask set.
-	 * Since shared usb code relies on it, set it here for now.
-	 * Once we move to full device tree support this will vanish off.
-	 */
-	ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
-	if (ret)
-		return ret;
-
 	platform_set_drvdata(pdev, exynos);
 
 	exynos->dev	= dev;
-- 
2.1.0

Re: [PATCH 3/3] usb: dwc3: host: Do not use dma_coerce_mask_and_coherent

[Arnd Bergmann]

On Tuesday, October 25, 2016 4:26:28 PM CEST Sriram Dash wrote:
> Do not use dma_coerce_mask_and_coherent for hcd.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

The patch is good, but please follow the usual rules for submitting
someone else's patch:

- As the first line, have "From: Arnd Bergmann <arnd@arndb.de>".
  "git format-patch" adds this automatically if you pass that
  address as the "--author" argument to "git commit".

- Add you "Signed-off-by" line at below mine (or any other lines)

I would also suggest a more elaborate changelog text, the
free-form text should explain why something is done, rather than
repeat the subject:

| The dma mask is correctly set up by the DT probe function, no
| need to override it any more.

	Arnd

RE: [PATCH 3/3] usb: dwc3: host: Do not use dma_coerce_mask_and_coherent

[Sriram Dash]

>From: Arnd Bergmann [mailto:arnd@arndb.de]
>On Tuesday, October 25, 2016 4:26:28 PM CEST Sriram Dash wrote:
>> Do not use dma_coerce_mask_and_coherent for hcd.
>>
>> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
>
>The patch is good, but please follow the usual rules for submitting someone else's
>patch:
>
>- As the first line, have "From: Arnd Bergmann <arnd@arndb.de>".
>  "git format-patch" adds this automatically if you pass that
>  address as the "--author" argument to "git commit".
>
>- Add you "Signed-off-by" line at below mine (or any other lines)
>
>I would also suggest a more elaborate changelog text, the free-form text should
>explain why something is done, rather than repeat the subject:
>
>| The dma mask is correctly set up by the DT probe function, no need to
>| override it any more.
>

Ok Arnd. I will take care for the next version.

>	Arnd