diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index dde4c83516a1870bd4ed7a11e3fe433ced0979af..e6b682c6c236b8152561496b2e00bba22e75e25c 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -3426,6 +3426,9 @@ static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state) unsigned long long u2_pel; int ret; + if (udev->state != USB_STATE_CONFIGURED) + return 0; + /* Convert SEL and PEL stored in ns to us */ u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000); u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000); diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c index fae697ed0b708352e06e6e6135a2b49ece4ea34a..773a6b28c4f1657670547265e0d73caed6366907 100644 --- a/drivers/usb/host/xhci-hub.c +++ b/drivers/usb/host/xhci-hub.c @@ -287,7 +287,7 @@ static int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend) if (virt_dev->eps[i].ring && virt_dev->eps[i].ring->dequeue) xhci_queue_stop_endpoint(xhci, slot_id, i, suspend); } - cmd->command_trb = xhci->cmd_ring->enqueue; + cmd->command_trb = xhci_find_next_enqueue(xhci->cmd_ring); list_add_tail(&cmd->cmd_list, &virt_dev->cmd_list); xhci_queue_stop_endpoint(xhci, slot_id, 0, suspend); xhci_ring_cmd_db(xhci); @@ -552,11 +552,15 @@ void xhci_del_comp_mod_timer(struct xhci_hcd *xhci, u32 status, u16 wIndex) * - Mark a port as being done with device resume, * and ring the endpoint doorbells. * - Stop the Synopsys redriver Compliance Mode polling. + * - Drop and reacquire the xHCI lock, in order to wait for port resume. */ static u32 xhci_get_port_status(struct usb_hcd *hcd, struct xhci_bus_state *bus_state, __le32 __iomem **port_array, - u16 wIndex, u32 raw_port_status) + u16 wIndex, u32 raw_port_status, + unsigned long flags) + __releases(&xhci->lock) + __acquires(&xhci->lock) { struct xhci_hcd *xhci = hcd_to_xhci(hcd); u32 status = 0; @@ -591,21 +595,42 @@ static u32 xhci_get_port_status(struct usb_hcd *hcd, return 0xffffffff; if (time_after_eq(jiffies, bus_state->resume_done[wIndex])) { + int time_left; + xhci_dbg(xhci, "Resume USB2 port %d\n", wIndex + 1); bus_state->resume_done[wIndex] = 0; clear_bit(wIndex, &bus_state->resuming_ports); + + set_bit(wIndex, &bus_state->rexit_ports); xhci_set_link_state(xhci, port_array, wIndex, XDEV_U0); - xhci_dbg(xhci, "set port %d resume\n", - wIndex + 1); - slot_id = xhci_find_slot_id_by_port(hcd, xhci, - wIndex + 1); - if (!slot_id) { - xhci_dbg(xhci, "slot_id is zero\n"); - return 0xffffffff; + + spin_unlock_irqrestore(&xhci->lock, flags); + time_left = wait_for_completion_timeout( + &bus_state->rexit_done[wIndex], + msecs_to_jiffies( + XHCI_MAX_REXIT_TIMEOUT)); + spin_lock_irqsave(&xhci->lock, flags); + + if (time_left) { + slot_id = xhci_find_slot_id_by_port(hcd, + xhci, wIndex + 1); + if (!slot_id) { + xhci_dbg(xhci, "slot_id is zero\n"); + return 0xffffffff; + } + xhci_ring_device(xhci, slot_id); + } else { + int port_status = xhci_readl(xhci, + port_array[wIndex]); + xhci_warn(xhci, "Port resume took longer than %i msec, port status = 0x%x\n", + XHCI_MAX_REXIT_TIMEOUT, + port_status); + status |= USB_PORT_STAT_SUSPEND; + clear_bit(wIndex, &bus_state->rexit_ports); } - xhci_ring_device(xhci, slot_id); + bus_state->port_c_suspend |= 1 << wIndex; bus_state->suspended_ports &= ~(1 << wIndex); } else { @@ -728,7 +753,7 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, break; } status = xhci_get_port_status(hcd, bus_state, port_array, - wIndex, temp); + wIndex, temp, flags); if (status == 0xffffffff) goto error; diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index 53b972c2a09f10be38a474042d03757618bc76a4..83bcd13622c3466e655a00166bf6e8076ae198bc 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -2428,6 +2428,8 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags) for (i = 0; i < USB_MAXCHILDREN; ++i) { xhci->bus_state[0].resume_done[i] = 0; xhci->bus_state[1].resume_done[i] = 0; + /* Only the USB 2.0 completions will ever be used. */ + init_completion(&xhci->bus_state[1].rexit_done[i]); } if (scratchpad_alloc(xhci, flags)) diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 411da1fc7ae8ad0550df9cecb8d5a4bdab0fa543..6bfbd80ec2b9edfa0a079767381d7d733d8c7035 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -123,6 +123,16 @@ static int enqueue_is_link_trb(struct xhci_ring *ring) return TRB_TYPE_LINK_LE32(link->control); } +union xhci_trb *xhci_find_next_enqueue(struct xhci_ring *ring) +{ + /* Enqueue pointer can be left pointing to the link TRB, + * we must handle that + */ + if (TRB_TYPE_LINK_LE32(ring->enqueue->link.control)) + return ring->enq_seg->next->trbs; + return ring->enqueue; +} + /* Updates trb to point to the next TRB in the ring, and updates seg if the next * TRB is in a new segment. This does not skip over link TRBs, and it does not * effect the ring dequeue or enqueue pointers. @@ -859,8 +869,12 @@ static void handle_stopped_endpoint(struct xhci_hcd *xhci, /* Otherwise ring the doorbell(s) to restart queued transfers */ ring_doorbell_for_active_rings(xhci, slot_id, ep_index); } - ep->stopped_td = NULL; - ep->stopped_trb = NULL; + + /* Clear stopped_td and stopped_trb if endpoint is not halted */ + if (!(ep->ep_state & EP_HALTED)) { + ep->stopped_td = NULL; + ep->stopped_trb = NULL; + } /* * Drop the lock and complete the URBs in the cancelled TD list. @@ -1414,6 +1428,12 @@ static void handle_cmd_completion(struct xhci_hcd *xhci, inc_deq(xhci, xhci->cmd_ring); return; } + /* There is no command to handle if we get a stop event when the + * command ring is empty, event->cmd_trb points to the next + * unset command + */ + if (xhci->cmd_ring->dequeue == xhci->cmd_ring->enqueue) + return; } switch (le32_to_cpu(xhci->cmd_ring->dequeue->generic.field[3]) @@ -1743,6 +1763,19 @@ static void handle_port_status(struct xhci_hcd *xhci, } } + /* + * Check to see if xhci-hub.c is waiting on RExit to U0 transition (or + * RExit to a disconnect state). If so, let the the driver know it's + * out of the RExit state. + */ + if (!DEV_SUPERSPEED(temp) && + test_and_clear_bit(faked_port_index, + &bus_state->rexit_ports)) { + complete(&bus_state->rexit_done[faked_port_index]); + bogus_port_status = true; + goto cleanup; + } + if (hcd->speed != HCD_USB3) xhci_test_and_clear_bit(xhci, port_array, faked_port_index, PORT_PLC); diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 49b6edb84a79eccfd5f935db8e03bad0957ee5ad..1e36dbb4836693dbe5ac90b8231361f82645a7b1 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -2598,15 +2598,7 @@ static int xhci_configure_endpoint(struct xhci_hcd *xhci, if (command) { cmd_completion = command->completion; cmd_status = &command->status; - command->command_trb = xhci->cmd_ring->enqueue; - - /* Enqueue pointer can be left pointing to the link TRB, - * we must handle that - */ - if (TRB_TYPE_LINK_LE32(command->command_trb->link.control)) - command->command_trb = - xhci->cmd_ring->enq_seg->next->trbs; - + command->command_trb = xhci_find_next_enqueue(xhci->cmd_ring); list_add_tail(&command->cmd_list, &virt_dev->cmd_list); } else { cmd_completion = &virt_dev->cmd_completion; @@ -2614,7 +2606,7 @@ static int xhci_configure_endpoint(struct xhci_hcd *xhci, } init_completion(cmd_completion); - cmd_trb = xhci->cmd_ring->dequeue; + cmd_trb = xhci_find_next_enqueue(xhci->cmd_ring); if (!ctx_change) ret = xhci_queue_configure_endpoint(xhci, in_ctx->dma, udev->slot_id, must_succeed); @@ -3439,14 +3431,7 @@ int xhci_discover_or_reset_device(struct usb_hcd *hcd, struct usb_device *udev) /* Attempt to submit the Reset Device command to the command ring */ spin_lock_irqsave(&xhci->lock, flags); - reset_device_cmd->command_trb = xhci->cmd_ring->enqueue; - - /* Enqueue pointer can be left pointing to the link TRB, - * we must handle that - */ - if (TRB_TYPE_LINK_LE32(reset_device_cmd->command_trb->link.control)) - reset_device_cmd->command_trb = - xhci->cmd_ring->enq_seg->next->trbs; + reset_device_cmd->command_trb = xhci_find_next_enqueue(xhci->cmd_ring); list_add_tail(&reset_device_cmd->cmd_list, &virt_dev->cmd_list); ret = xhci_queue_reset_device(xhci, slot_id); @@ -3650,7 +3635,7 @@ int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev) union xhci_trb *cmd_trb; spin_lock_irqsave(&xhci->lock, flags); - cmd_trb = xhci->cmd_ring->dequeue; + cmd_trb = xhci_find_next_enqueue(xhci->cmd_ring); ret = xhci_queue_slot_control(xhci, TRB_ENABLE_SLOT, 0); if (ret) { spin_unlock_irqrestore(&xhci->lock, flags); @@ -3785,7 +3770,7 @@ int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev) slot_ctx->dev_info >> 27); spin_lock_irqsave(&xhci->lock, flags); - cmd_trb = xhci->cmd_ring->dequeue; + cmd_trb = xhci_find_next_enqueue(xhci->cmd_ring); ret = xhci_queue_address_device(xhci, virt_dev->in_ctx->dma, udev->slot_id); if (ret) { diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 46aa14894148962e3aff6c8028f8d07cbcb07951..289fbfbae7463f429ef051602e08e7eccb3e06e8 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1412,8 +1412,18 @@ struct xhci_bus_state { unsigned long resume_done[USB_MAXCHILDREN]; /* which ports have started to resume */ unsigned long resuming_ports; + /* Which ports are waiting on RExit to U0 transition. */ + unsigned long rexit_ports; + struct completion rexit_done[USB_MAXCHILDREN]; }; + +/* + * It can take up to 20 ms to transition from RExit to U0 on the + * Intel Lynx Point LP xHCI host. + */ +#define XHCI_MAX_REXIT_TIMEOUT (20 * 1000) + static inline unsigned int hcd_index(struct usb_hcd *hcd) { if (hcd->speed == HCD_USB3) @@ -1840,6 +1850,7 @@ int xhci_cancel_cmd(struct xhci_hcd *xhci, struct xhci_command *command, union xhci_trb *cmd_trb); void xhci_ring_ep_doorbell(struct xhci_hcd *xhci, unsigned int slot_id, unsigned int ep_index, unsigned int stream_id); +union xhci_trb *xhci_find_next_enqueue(struct xhci_ring *ring); /* xHCI roothub code */ void xhci_set_link_state(struct xhci_hcd *xhci, __le32 __iomem **port_array,