diff options
Diffstat (limited to 'drivers/usb/host/xhci-ring.c')
| -rw-r--r-- | drivers/usb/host/xhci-ring.c | 76 |
1 files changed, 70 insertions, 6 deletions
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 766f6a6..27d690d 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -2655,6 +2655,35 @@ static u32 xhci_td_remainder(unsigned int remainder) return (remainder >> 10) << 17; } +/* + * For xHCI 1.0 host controllers, TD size is the number of packets remaining in + * the TD (*not* including this TRB). + * + * Total TD packet count = total_packet_count = + * roundup(TD size in bytes / wMaxPacketSize) + * + * Packets transferred up to and including this TRB = packets_transferred = + * rounddown(total bytes transferred including this TRB / wMaxPacketSize) + * + * TD size = total_packet_count - packets_transferred + * + * It must fit in bits 21:17, so it can't be bigger than 31. + */ + +static u32 xhci_v1_0_td_remainder(int running_total, int trb_buff_len, + unsigned int total_packet_count, struct urb *urb) +{ + int packets_transferred; + + /* All the TRB queueing functions don't count the current TRB in + * running_total. + */ + packets_transferred = (running_total + trb_buff_len) / + le16_to_cpu(urb->ep->desc.wMaxPacketSize); + + return xhci_td_remainder(total_packet_count - packets_transferred); +} + static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct urb *urb, int slot_id, unsigned int ep_index) { @@ -2665,6 +2694,7 @@ static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct scatterlist *sg; int num_sgs; int trb_buff_len, this_sg_len, running_total; + unsigned int total_packet_count; bool first_trb; u64 addr; bool more_trbs_coming; @@ -2678,6 +2708,8 @@ static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t mem_flags, num_trbs = count_sg_trbs_needed(xhci, urb); num_sgs = urb->num_sgs; + total_packet_count = roundup(urb->transfer_buffer_length, + le16_to_cpu(urb->ep->desc.wMaxPacketSize)); trb_buff_len = prepare_transfer(xhci, xhci->devs[slot_id], ep_index, urb->stream_id, @@ -2758,11 +2790,20 @@ static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t mem_flags, (unsigned int) (addr + TRB_MAX_BUFF_SIZE) & ~(TRB_MAX_BUFF_SIZE - 1), (unsigned int) addr + trb_buff_len); } - remainder = xhci_td_remainder(urb->transfer_buffer_length - - running_total) ; + + /* 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); + } length_field = TRB_LEN(trb_buff_len) | remainder | TRB_INTR_TARGET(0); + if (num_trbs > 1) more_trbs_coming = true; else @@ -2819,6 +2860,7 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags, u32 field, length_field; int running_total, trb_buff_len, ret; + unsigned int total_packet_count; u64 addr; if (urb->num_sgs) @@ -2873,6 +2915,8 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags, start_cycle = ep_ring->cycle_state; running_total = 0; + total_packet_count = roundup(urb->transfer_buffer_length, + le16_to_cpu(urb->ep->desc.wMaxPacketSize)); /* How much data is in the first TRB? */ addr = (u64) urb->transfer_dma; trb_buff_len = TRB_MAX_BUFF_SIZE - @@ -2910,11 +2954,19 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags, if (usb_urb_dir_in(urb)) field |= TRB_ISP; - remainder = xhci_td_remainder(urb->transfer_buffer_length - - running_total); + /* 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); + } length_field = TRB_LEN(trb_buff_len) | remainder | TRB_INTR_TARGET(0); + if (num_trbs > 1) more_trbs_coming = true; else @@ -3111,12 +3163,15 @@ static int xhci_queue_isoc_tx(struct xhci_hcd *xhci, gfp_t mem_flags, /* Queue the first TRB, even if it's zero-length */ for (i = 0; i < num_tds; i++) { - first_trb = true; + unsigned int total_packet_count; + first_trb = true; running_total = 0; addr = start_addr + urb->iso_frame_desc[i].offset; td_len = urb->iso_frame_desc[i].length; td_remain_len = td_len; + total_packet_count = roundup(td_len, + le16_to_cpu(urb->ep->desc.wMaxPacketSize)); trbs_per_td = count_isoc_trbs_needed(xhci, urb, i); @@ -3172,10 +3227,19 @@ static int xhci_queue_isoc_tx(struct xhci_hcd *xhci, gfp_t mem_flags, if (trb_buff_len > td_remain_len) trb_buff_len = td_remain_len; - remainder = xhci_td_remainder(td_len - running_total); + /* 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); + } length_field = TRB_LEN(trb_buff_len) | remainder | TRB_INTR_TARGET(0); + queue_trb(xhci, ep_ring, false, more_trbs_coming, lower_32_bits(addr), upper_32_bits(addr), |