diff options
| -rw-r--r-- | drivers/usb/host/xhci-dbg.c | 2 | ||||
| -rw-r--r-- | drivers/usb/host/xhci-ring.c | 44 | ||||
| -rw-r--r-- | drivers/usb/host/xhci.h | 6 |
3 files changed, 47 insertions, 5 deletions
diff --git a/drivers/usb/host/xhci-dbg.c b/drivers/usb/host/xhci-dbg.c index c867ecbeaa60..2d16faefb429 100644 --- a/drivers/usb/host/xhci-dbg.c +++ b/drivers/usb/host/xhci-dbg.c @@ -101,6 +101,8 @@ static void xhci_print_cap_regs(struct xhci_hcd *xhci) HCC_64BIT_ADDR(temp) ? "64" : "32"); xhci_dbg(xhci, " HC %s Contiguous Frame ID Capability\n", HCC_CFC(temp) ? "has" : "hasn't"); + xhci_dbg(xhci, " HC %s generate Stopped - Short Package event\n", + HCC_SPC(temp) ? "can" : "can't"); /* FIXME */ xhci_dbg(xhci, " FIXME: more HCCPARAMS debugging\n"); diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index af8c0f24cf46..5fbf33987a85 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -1812,7 +1812,9 @@ static int finish_td(struct xhci_hcd *xhci, struct xhci_td *td, if (skip) goto td_cleanup; - if (trb_comp_code == COMP_STOP_INVAL || trb_comp_code == COMP_STOP) { + if (trb_comp_code == COMP_STOP_INVAL || + trb_comp_code == COMP_STOP || + trb_comp_code == COMP_STOP_SHORT) { /* The Endpoint Stop Command completion will take care of any * stopped TDs. A stopped TD may be restarted, so don't update * the ring dequeue pointer or take this TD off any lists yet. @@ -1919,8 +1921,22 @@ static int process_ctrl_td(struct xhci_hcd *xhci, struct xhci_td *td, else *status = 0; break; - case COMP_STOP_INVAL: + case COMP_STOP_SHORT: + if (event_trb == ep_ring->dequeue || event_trb == td->last_trb) + xhci_warn(xhci, "WARN: Stopped Short Packet on ctrl setup or status TRB\n"); + else + td->urb->actual_length = + EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)); + + return finish_td(xhci, td, event_trb, event, ep, status, false); case COMP_STOP: + /* Did we stop at data stage? */ + if (event_trb != ep_ring->dequeue && event_trb != td->last_trb) + td->urb->actual_length = + td->urb->transfer_buffer_length - + EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)); + /* fall through */ + case COMP_STOP_INVAL: return finish_td(xhci, td, event_trb, event, ep, status, false); default: if (!xhci_requires_manual_halt_cleanup(xhci, @@ -2014,6 +2030,8 @@ static int process_isoc_td(struct xhci_hcd *xhci, struct xhci_td *td, } if ((xhci->quirks & XHCI_TRUST_TX_LENGTH)) trb_comp_code = COMP_SHORT_TX; + /* fallthrough */ + case COMP_STOP_SHORT: case COMP_SHORT_TX: frame->status = td->urb->transfer_flags & URB_SHORT_NOT_OK ? -EREMOTEIO : 0; @@ -2049,6 +2067,10 @@ static int process_isoc_td(struct xhci_hcd *xhci, struct xhci_td *td, if (trb_comp_code == COMP_SUCCESS || skip_td) { frame->actual_length = frame->length; td->urb->actual_length += frame->length; + } else if (trb_comp_code == COMP_STOP_SHORT) { + frame->actual_length = + EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)); + td->urb->actual_length += frame->actual_length; } else { for (cur_trb = ep_ring->dequeue, cur_seg = ep_ring->deq_seg; cur_trb != event_trb; @@ -2129,6 +2151,7 @@ static int process_bulk_intr_td(struct xhci_hcd *xhci, struct xhci_td *td, *status = 0; } break; + case COMP_STOP_SHORT: case COMP_SHORT_TX: if (td->urb->transfer_flags & URB_SHORT_NOT_OK) *status = -EREMOTEIO; @@ -2145,8 +2168,20 @@ static int process_bulk_intr_td(struct xhci_hcd *xhci, struct xhci_td *td, td->urb->ep->desc.bEndpointAddress, td->urb->transfer_buffer_length, EVENT_TRB_LEN(le32_to_cpu(event->transfer_len))); + /* Stopped - short packet completion */ + if (trb_comp_code == COMP_STOP_SHORT) { + td->urb->actual_length = + EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)); + + if (td->urb->transfer_buffer_length < + td->urb->actual_length) { + xhci_warn(xhci, "HC gave bad length of %d bytes txed\n", + EVENT_TRB_LEN(le32_to_cpu(event->transfer_len))); + td->urb->actual_length = 0; + /* status will be set by usb core for canceled urbs */ + } /* Fast path - was this the last TRB in the TD for this URB? */ - if (event_trb == td->last_trb) { + } else if (event_trb == td->last_trb) { if (EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)) != 0) { td->urb->actual_length = td->urb->transfer_buffer_length - @@ -2300,6 +2335,9 @@ static int handle_tx_event(struct xhci_hcd *xhci, case COMP_STOP_INVAL: xhci_dbg(xhci, "Stopped on No-op or Link TRB\n"); break; + case COMP_STOP_SHORT: + xhci_dbg(xhci, "Stopped with short packet transfer detected\n"); + break; case COMP_STALL: xhci_dbg(xhci, "Stalled endpoint\n"); ep->ep_state |= EP_HALTED; diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 73686928cae3..dbda41e91c84 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -119,6 +119,8 @@ struct xhci_cap_regs { #define HCC_LTC(p) ((p) & (1 << 6)) /* true: no secondary Stream ID Support */ #define HCC_NSS(p) ((p) & (1 << 7)) +/* true: HC supports Stopped - Short Packet */ +#define HCC_SPC(p) ((p) & (1 << 9)) /* true: HC has Contiguous Frame ID Capability */ #define HCC_CFC(p) ((p) & (1 << 11)) /* Max size for Primary Stream Arrays - 2^(n+1), where n is bits 12:15 */ @@ -1063,8 +1065,8 @@ struct xhci_transfer_event { #define COMP_STOP 26 /* Same as COMP_EP_STOPPED, but the transferred length in the event is invalid */ #define COMP_STOP_INVAL 27 -/* Control Abort Error - Debug Capability - control pipe aborted */ -#define COMP_DBG_ABORT 28 +/* Same as COMP_EP_STOPPED, but a short packet detected */ +#define COMP_STOP_SHORT 28 /* Max Exit Latency Too Large Error */ #define COMP_MEL_ERR 29 /* TRB type 30 reserved */ |