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usb: Add helper API to issue stop endpoint command

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This API is used to issue stop endpoint command on
requested endpoint in order to retire all active TRBs
in the transfer ring.

Change-Id: I312772367a2cd293982a66ea8b75e04a8b1f2fd0
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
This commit is contained in:
Hemant Kumar 2017-11-14 20:06:15 -08:00 committed by Mayank Rana
parent dcfa572221
commit 0a1c067c9e
5 changed files with 77 additions and 0 deletions
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8
drivers/usb/core/hcd.c
View File

@ -2300,6 +2300,14 @@ int usb_hcd_get_controller_id(struct usb_device *udev)
return hcd->driver->get_core_id(hcd);
}
int usb_hcd_stop_endpoint(struct usb_device *udev,
struct usb_host_endpoint *ep)
{
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
return hcd->driver->stop_endpoint(hcd, udev, ep);
}
#ifdef CONFIG_PM
int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg)

6
drivers/usb/core/usb.c
View File

@ -871,6 +871,12 @@ int usb_get_controller_id(struct usb_device *dev)
}
EXPORT_SYMBOL(usb_get_controller_id);
int usb_stop_endpoint(struct usb_device *dev, struct usb_host_endpoint *ep)
{
return usb_hcd_stop_endpoint(dev, ep);
}
EXPORT_SYMBOL(usb_stop_endpoint);
/*-------------------------------------------------------------------*/
/*
* __usb_get_extra_descriptor() finds a descriptor of specific type in the

56
drivers/usb/host/xhci.c
View File

@ -4986,6 +4986,61 @@ int xhci_get_core_id(struct usb_hcd *hcd)
return xhci->core_id;
}
static int xhci_stop_endpoint(struct usb_hcd *hcd,
struct usb_device *udev, struct usb_host_endpoint *ep)
{
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
unsigned int ep_index;
struct xhci_virt_device *virt_dev;
struct xhci_command *cmd;
unsigned long flags;
int ret = 0;
cmd = xhci_alloc_command(xhci, false, true, GFP_NOIO);
if (!cmd)
return -ENOMEM;
spin_lock_irqsave(&xhci->lock, flags);
virt_dev = xhci->devs[udev->slot_id];
if (!virt_dev) {
ret = -ENODEV;
goto err;
}
ep_index = xhci_get_endpoint_index(&ep->desc);
if (virt_dev->eps[ep_index].ring &&
virt_dev->eps[ep_index].ring->dequeue) {
ret = xhci_queue_stop_endpoint(xhci, cmd, udev->slot_id,
ep_index, 0);
if (ret)
goto err;
xhci_ring_cmd_db(xhci);
spin_unlock_irqrestore(&xhci->lock, flags);
/* Wait for stop endpoint command to finish */
wait_for_completion(cmd->completion);
if (cmd->status == COMP_COMMAND_ABORTED ||
cmd->status == COMP_STOPPED) {
xhci_warn(xhci,
"stop endpoint command timeout for ep%d%s\n",
usb_endpoint_num(&ep->desc),
usb_endpoint_dir_in(&ep->desc) ? "in" : "out");
ret = -ETIME;
}
goto free_cmd;
}
err:
spin_unlock_irqrestore(&xhci->lock, flags);
free_cmd:
xhci_free_command(xhci, cmd);
return ret;
}
static const struct hc_driver xhci_hc_driver = {
.description = "xhci-hcd",
.product_desc = "xHCI Host Controller",
@ -5050,6 +5105,7 @@ static const struct hc_driver xhci_hc_driver = {
.get_sec_event_ring_phys_addr = xhci_get_sec_event_ring_phys_addr,
.get_xfer_ring_phys_addr = xhci_get_xfer_ring_phys_addr,
.get_core_id = xhci_get_core_id,
.stop_endpoint = xhci_stop_endpoint,
};
void xhci_init_driver(struct hc_driver *drv,

3
include/linux/usb.h
View File

@ -826,6 +826,9 @@ extern phys_addr_t usb_get_xfer_ring_phys_addr(struct usb_device *dev,
struct usb_host_endpoint *ep, dma_addr_t *dma);
extern int usb_get_controller_id(struct usb_device *dev);
extern int usb_stop_endpoint(struct usb_device *dev,
struct usb_host_endpoint *ep);
/* Sets up a group of bulk endpoints to support multiple stream IDs. */
extern int usb_alloc_streams(struct usb_interface *interface,
struct usb_host_endpoint **eps, unsigned int num_eps,

4
include/linux/usb/hcd.h
View File

@ -408,6 +408,8 @@ struct hc_driver {
struct usb_device *udev, struct usb_host_endpoint *ep,
dma_addr_t *dma);
int (*get_core_id)(struct usb_hcd *hcd);
int (*stop_endpoint)(struct usb_hcd *hcd, struct usb_device *udev,
struct usb_host_endpoint *ep);
};
static inline int hcd_giveback_urb_in_bh(struct usb_hcd *hcd)
@ -455,6 +457,8 @@ extern phys_addr_t usb_hcd_get_sec_event_ring_phys_addr(
extern phys_addr_t usb_hcd_get_xfer_ring_phys_addr(
struct usb_device *udev, struct usb_host_endpoint *ep, dma_addr_t *dma);
extern int usb_hcd_get_controller_id(struct usb_device *udev);
extern int usb_hcd_stop_endpoint(struct usb_device *udev,
struct usb_host_endpoint *ep);
struct usb_hcd *__usb_create_hcd(const struct hc_driver *driver,
struct device *sysdev, struct device *dev, const char *bus_name,