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| author |  Zeng Tao <prime.zeng@hisilicon.com>
| 2018-09-28 19:27:52 +0800 |
|---|---|---|
| committer |  Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| 2018-10-02 12:05:30 -0700 |
| commit | bd0e6c9614b95352eb31d0207df16dc156c527fa (patch) | |
| tree | 274c7a7b59d5b149f183371dff221a52f292a9b4 /Documentation/admin-guide | |
| parent | dt-bindings: usb-xhci: Document r8a7744 support (diff) | |
| download | linux-bd0e6c9614b95352eb31d0207df16dc156c527fa.tar.gz linux-bd0e6c9614b95352eb31d0207df16dc156c527fa.tar.bz2 linux-bd0e6c9614b95352eb31d0207df16dc156c527fa.zip | |
usb: hub: try old enumeration scheme first for high speed devices
The new scheme is required just to support legacy low and full-speed
devices. For high speed devices, it will slower the enumeration speed.
So in this patch we try the "old" enumeration scheme first for high speed
devices, and this is what Windows does since Windows 8.
Signed-off-by: Zeng Tao <prime.zeng@hisilicon.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Reviewed-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 92eb1f42240d..151c527571e5 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -4610,7 +4610,8 @@ usbcore.old_scheme_first= [USB] Start with the old device initialization - scheme (default 0 = off). + scheme, applies only to low and full-speed devices + (default 0 = off). usbcore.usbfs_memory_mb= [USB] Memory limit (in MB) for buffers allocated by |