----- Original Message -----
> From: [email protected]
> To: "sarah a sharp" <[email protected]>, "bhavik kothari"
> <[email protected]>, "chintan
> mehta" <[email protected]>, "shimmering h"
> <[email protected]>
> Cc: [email protected]
> Sent: Wednesday, January 9, 2013 4:47:08 AM
> Subject: FAILED: patch "[PATCH] xHCI: Fix TD Size calculation on 1.0 hosts."
> failed to apply to 3.0-stable tree
>
>
> The patch below does not apply to the 3.0-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git
> commit
> id to <[email protected]>.
I'll working on this.
>
> thanks,
>
> greg k-h
>
> ------------------ original commit in Linus's tree ------------------
>
> From 4525c0a10dff7ad3669763c28016c7daffc3900e Mon Sep 17 00:00:00
> 2001
> From: Sarah Sharp <[email protected]>
> Date: Thu, 25 Oct 2012 15:56:40 -0700
> Subject: [PATCH] xHCI: Fix TD Size calculation on 1.0 hosts.
>
> The xHCI 1.0 specification made a change to the TD Size field in
> TRBs.
> The value is now the number of packets that remain to be sent in the
> TD,
> not including this TRB. The TD Size value for the last TRB in a TD
> must
> always be zero.
>
> The xHCI function xhci_v1_0_td_remainder() attempts to calculate
> this,
> but it gets it wrong. First, it erroneously reuses the old
> xhci_td_remainder function, which will right shift the value by 10.
> The
> xHCI 1.0 spec as of June 2011 says nothing about right shifting by
> 10.
> Second, it does not set the TD size for the last TRB in a TD to zero.
>
> Third, it uses roundup instead of DIV_ROUND_UP. The total packet
> count
> is supposed to be the total number of bytes in this TD, divided by
> the
> max packet size, rounded up. DIV_ROUND_UP is the right function to
> use
> in that case.
>
> With the old code, a TD on an endpoint with max packet size 1024
> would
> be set up like so:
> TRB 1, TRB length = 600 bytes, TD size = 0
> TRB 1, TRB length = 200 bytes, TD size = 0
> TRB 1, TRB length = 100 bytes, TD size = 0
>
> With the new code, the TD would be set up like this:
> TRB 1, TRB length = 600 bytes, TD size = 1
> TRB 1, TRB length = 200 bytes, TD size = 1
> TRB 1, TRB length = 100 bytes, TD size = 0
>
> This commit should be backported to kernels as old as 3.0, that
> contain
> the commit 4da6e6f247a2601ab9f1e63424e4d944ed4124f3 "xhci 1.0: Update
> TD
> size field format."
>
> Signed-off-by: Sarah Sharp <[email protected]>
> Reported-by: Chintan Mehta <[email protected]>
> Reported-by: Shimmer Huang <[email protected]>
> Tested-by: Bhavik Kothari <[email protected]>
> Tested-by: Shimmer Huang <[email protected]>
> Cc: [email protected]
>
> diff --git a/drivers/usb/host/xhci-ring.c
> b/drivers/usb/host/xhci-ring.c
> index 77f1ace..cbb44b7 100644
> --- a/drivers/usb/host/xhci-ring.c
> +++ b/drivers/usb/host/xhci-ring.c
> @@ -3071,11 +3071,11 @@ static u32 xhci_td_remainder(unsigned int
> remainder)
> }
>
> /*
> - * For xHCI 1.0 host controllers, TD size is the number of packets
> remaining in
> - * the TD (*not* including this TRB).
> + * For xHCI 1.0 host controllers, TD size is the number of max
> packet sized
> + * packets remaining in the TD (*not* including this TRB).
> *
> * Total TD packet count = total_packet_count =
> - * roundup(TD size in bytes / wMaxPacketSize)
> + * DIV_ROUND_UP(TD size in bytes / wMaxPacketSize)
> *
> * Packets transferred up to and including this TRB =
> packets_transferred =
> * rounddown(total bytes transferred including this TRB /
> wMaxPacketSize)
> @@ -3083,15 +3083,16 @@ 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.
> + * 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 total_packet_count, struct urb *urb,
> + unsigned int num_trbs_left)
> {
> int packets_transferred;
>
> /* One TRB with a zero-length data packet. */
> - if (running_total == 0 && trb_buff_len == 0)
> + if (num_trbs_left == 0 || (running_total == 0 && trb_buff_len ==
> 0))
> return 0;
>
> /* All the TRB queueing functions don't count the current TRB in
> @@ -3100,7 +3101,9 @@ static u32 xhci_v1_0_td_remainder(int
> running_total, int trb_buff_len,
> packets_transferred = (running_total + trb_buff_len) /
> usb_endpoint_maxp(&urb->ep->desc);
>
> - return xhci_td_remainder(total_packet_count - packets_transferred);
> + if ((total_packet_count - packets_transferred) > 31)
> + return 31 << 17;
> + return (total_packet_count - packets_transferred) << 17;
> }
>
> static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
> @@ -3127,7 +3130,7 @@ 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_mapped_sgs;
> - total_packet_count = roundup(urb->transfer_buffer_length,
> + total_packet_count = DIV_ROUND_UP(urb->transfer_buffer_length,
> usb_endpoint_maxp(&urb->ep->desc));
>
> trb_buff_len = prepare_transfer(xhci, xhci->devs[slot_id],
> @@ -3210,7 +3213,8 @@ static int queue_bulk_sg_tx(struct xhci_hcd
> *xhci, gfp_t mem_flags,
> running_total);
> } else {
> remainder = xhci_v1_0_td_remainder(running_total,
> - trb_buff_len, total_packet_count, urb);
> + trb_buff_len, total_packet_count, urb,
> + num_trbs - 1);
> }
> length_field = TRB_LEN(trb_buff_len) |
> remainder |
> @@ -3318,7 +3322,7 @@ 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,
> + total_packet_count = DIV_ROUND_UP(urb->transfer_buffer_length,
> usb_endpoint_maxp(&urb->ep->desc));
> /* How much data is in the first TRB? */
> addr = (u64) urb->transfer_dma;
> @@ -3364,7 +3368,8 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci,
> gfp_t mem_flags,
> running_total);
> } else {
> remainder = xhci_v1_0_td_remainder(running_total,
> - trb_buff_len, total_packet_count, urb);
> + trb_buff_len, total_packet_count, urb,
> + num_trbs - 1);
> }
> length_field = TRB_LEN(trb_buff_len) |
> remainder |
> @@ -3627,7 +3632,7 @@ static int xhci_queue_isoc_tx(struct xhci_hcd
> *xhci, gfp_t mem_flags,
> 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,
> + total_packet_count = DIV_ROUND_UP(td_len,
> usb_endpoint_maxp(&urb->ep->desc));
> /* A zero-length transfer still involves at least one packet. */
> if (total_packet_count == 0)
> @@ -3706,7 +3711,8 @@ static int xhci_queue_isoc_tx(struct xhci_hcd
> *xhci, gfp_t mem_flags,
> } else {
> remainder = xhci_v1_0_td_remainder(
> running_total, trb_buff_len,
> - total_packet_count, urb);
> + total_packet_count, urb,
> + (trbs_per_td - j - 1));
> }
> length_field = TRB_LEN(trb_buff_len) |
> remainder |
>
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