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| author |   Chunfeng Yun <chunfeng.yun@mediatek.com> | 2021-03-08 10:51:53 +0800 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-10 09:37:16 +0100 |
| commit | 1bf661daf6b084bc4d753f55b54f35dc98709685 (patch) | |
| tree | c2785efd89cf86c1ccb2f69ef08ea082e9cd45f6 /drivers/usb/common/debug.c | |
| parent | usb: xhci-mtk: get the microframe boundary for ESIT (diff) | |
| download | linux-dev-1bf661daf6b084bc4d753f55b54f35dc98709685.tar.xz linux-dev-1bf661daf6b084bc4d753f55b54f35dc98709685.zip | |
usb: xhci-mtk: add only one extra CS for FS/LS INTR
In USB2 Spec:
"11.18.5 TT Response Generation
In general, there will be two (or more) complete-split
transactions scheduled for a periodic endpoint.
However, for interrupt endpoints, the maximum size of
the full-/low-speed transaction guarantees that it can
never require more than two complete-split transactions.
Two complete-split transactions are only required
when the transaction spans a microframe boundary."
Due to the maxp is 64, and less then 188 (at most in one
microframe), seems never span boundary, so use only one CS
for FS/LS interrupt transfer, this will save some bandwidth.
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/5b9ff09f53d23cf9e5c5437db4ffc18b798bf60c.1615170625.git.chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/common/debug.c')
0 files changed, 0 insertions, 0 deletions