Searched hist:dbdd01408220a5006ca6890c3ab778fd52493a42 (Results 1 – 1 of 1) sorted by relevance
| /rk3399_rockchip-uboot/drivers/usb/host/ |
| H A D | xhci.c | dbdd01408220a5006ca6890c3ab778fd52493a42 Thu Sep 07 13:13:18 UTC 2017 Bin Meng <bmeng.cn@gmail.com> UPSTREAM: dm: usb: xhci: Implement get_max_xfer_size() operation
xHCD allocates one segment which includes 64 TRBs for each endpoint
and the last TRB in this segment is configured as a link TRB to form
a TRB ring. Each TRB can transfer up to 64K bytes, however data
buffers referenced by transfer TRBs shall not span 64KB boundaries.
Hence the maximum number of TRBs we can use in one transfer is 62.
Change-Id: I7ea20b7805fe4da11343d38001a414b95751c7d5
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
(cherry picked from commit 022ceacaf8a6a67f86f0a5ed8f6ce6b2f6ab73a4)
|