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dm: usb: xhci: Implement get_max_xfer_size() operation
authorBin Meng <bmeng.cn@gmail.com>
Thu, 7 Sep 2017 13:13:18 +0000 (06:13 -0700)
committerMarek Vasut <marek.vasut+renesas@gmail.com>
Wed, 27 Sep 2017 10:12:22 +0000 (12:12 +0200)
commit022ceacaf8a6a67f86f0a5ed8f6ce6b2f6ab73a4
tree80c4c186f1765fb057c26bca5a59a98d96e2e109tree | snapshot
parent3e59f59015e39ceb870fa8a7a12e0464e775512bcommit | diff
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.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
drivers/usb/host/xhci.c diff | blob | history
Domain: System / Kernel;