diff options
Diffstat (limited to 'drivers/usb/host/xhci-ring.c')
| -rw-r--r-- | drivers/usb/host/xhci-ring.c | 106 |
1 files changed, 44 insertions, 62 deletions
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 41d7a05f8af4..e6d858a49d04 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -3001,21 +3001,6 @@ int xhci_queue_intr_tx(struct xhci_hcd *xhci, gfp_t mem_flags, } /* - * The TD size is the number of bytes remaining in the TD (including this TRB), - * right shifted by 10. - * It must fit in bits 21:17, so it can't be bigger than 31. - */ -static u32 xhci_td_remainder(unsigned int remainder) -{ - u32 max = (1 << (21 - 17 + 1)) - 1; - - if ((remainder >> 10) >= max) - return max << 17; - else - return (remainder >> 10) << 17; -} - -/* * For xHCI 1.0 host controllers, TD size is the number of max packet sized * packets remaining in the TD (*not* including this TRB). * @@ -3027,30 +3012,36 @@ static u32 xhci_td_remainder(unsigned int remainder) * * TD size = total_packet_count - packets_transferred * - * It must fit in bits 21:17, so it can't be bigger than 31. + * For xHCI 0.96 and older, TD size field should be the remaining bytes + * including this TRB, right shifted by 10 + * + * For all hosts it must fit in bits 21:17, so it can't be bigger than 31. + * This is taken care of in the TRB_TD_SIZE() macro + * * The last TRB in a TD must have the TD size set to zero. */ -static u32 xhci_v1_0_td_remainder(int running_total, int trb_buff_len, - unsigned int total_packet_count, struct urb *urb, - unsigned int num_trbs_left) +static u32 xhci_td_remainder(struct xhci_hcd *xhci, int transferred, + int trb_buff_len, unsigned int td_total_len, + struct urb *urb, unsigned int num_trbs_left) { - int packets_transferred; + u32 maxp, total_packet_count; + + if (xhci->hci_version < 0x100) + return ((td_total_len - transferred) >> 10); + + maxp = GET_MAX_PACKET(usb_endpoint_maxp(&urb->ep->desc)); + total_packet_count = DIV_ROUND_UP(td_total_len, maxp); /* One TRB with a zero-length data packet. */ - if (num_trbs_left == 0 || (running_total == 0 && trb_buff_len == 0)) + if (num_trbs_left == 0 || (transferred == 0 && trb_buff_len == 0) || + trb_buff_len == td_total_len) return 0; - /* All the TRB queueing functions don't count the current TRB in - * running_total. - */ - packets_transferred = (running_total + trb_buff_len) / - GET_MAX_PACKET(usb_endpoint_maxp(&urb->ep->desc)); - - if ((total_packet_count - packets_transferred) > 31) - return 31 << 17; - return (total_packet_count - packets_transferred) << 17; + /* Queueing functions don't count the current TRB into transferred */ + return (total_packet_count - ((transferred + trb_buff_len) / maxp)); } + static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct urb *urb, int slot_id, unsigned int ep_index) { @@ -3172,17 +3163,12 @@ static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t mem_flags, } /* Set the TRB length, TD size, and interrupter fields. */ - if (xhci->hci_version < 0x100) { - remainder = xhci_td_remainder( - urb->transfer_buffer_length - - running_total); - } else { - remainder = xhci_v1_0_td_remainder(running_total, - trb_buff_len, total_packet_count, urb, - num_trbs - 1); - } + remainder = xhci_td_remainder(xhci, running_total, trb_buff_len, + urb->transfer_buffer_length, + urb, num_trbs - 1); + length_field = TRB_LEN(trb_buff_len) | - remainder | + TRB_TD_SIZE(remainder) | TRB_INTR_TARGET(0); if (num_trbs > 1) @@ -3345,17 +3331,12 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags, field |= TRB_ISP; /* Set the TRB length, TD size, and interrupter fields. */ - if (xhci->hci_version < 0x100) { - remainder = xhci_td_remainder( - urb->transfer_buffer_length - - running_total); - } else { - remainder = xhci_v1_0_td_remainder(running_total, - trb_buff_len, total_packet_count, urb, - num_trbs - 1); - } + remainder = xhci_td_remainder(xhci, running_total, trb_buff_len, + urb->transfer_buffer_length, + urb, num_trbs - 1); + length_field = TRB_LEN(trb_buff_len) | - remainder | + TRB_TD_SIZE(remainder) | TRB_INTR_TARGET(0); if (num_trbs > 1) @@ -3393,7 +3374,7 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct usb_ctrlrequest *setup; struct xhci_generic_trb *start_trb; int start_cycle; - u32 field, length_field; + u32 field, length_field, remainder; struct urb_priv *urb_priv; struct xhci_td *td; @@ -3466,9 +3447,15 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags, else field = TRB_TYPE(TRB_DATA); + remainder = xhci_td_remainder(xhci, 0, + urb->transfer_buffer_length, + urb->transfer_buffer_length, + urb, 1); + length_field = TRB_LEN(urb->transfer_buffer_length) | - xhci_td_remainder(urb->transfer_buffer_length) | + TRB_TD_SIZE(remainder) | TRB_INTR_TARGET(0); + if (urb->transfer_buffer_length > 0) { if (setup->bRequestType & USB_DIR_IN) field |= TRB_DIR_IN; @@ -3691,17 +3678,12 @@ static int xhci_queue_isoc_tx(struct xhci_hcd *xhci, gfp_t mem_flags, trb_buff_len = td_remain_len; /* Set the TRB length, TD size, & interrupter fields. */ - if (xhci->hci_version < 0x100) { - remainder = xhci_td_remainder( - td_len - running_total); - } else { - remainder = xhci_v1_0_td_remainder( - running_total, trb_buff_len, - total_packet_count, urb, - (trbs_per_td - j - 1)); - } + remainder = xhci_td_remainder(xhci, running_total, + trb_buff_len, td_len, + urb, trbs_per_td - j - 1); + length_field = TRB_LEN(trb_buff_len) | - remainder | + TRB_TD_SIZE(remainder) | TRB_INTR_TARGET(0); queue_trb(xhci, ep_ring, more_trbs_coming, |