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| author | Nicolas Boichat <drinkcat@chromium.org> | 2018-05-28 08:32:18 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-31 12:48:17 +0200 |
| commit | 25244227158e1502062041365a439a54cb8fe673 (patch) | |
| tree | 87af664545c88bc045cd1598c79caad305d77178 /Documentation/ABI/testing/sysfs-fs-xfs | |
| parent | usb: xhci: tegra: Fix runtime PM support (diff) | |
| download | linux-25244227158e1502062041365a439a54cb8fe673.tar.xz linux-25244227158e1502062041365a439a54cb8fe673.zip | |
usb: hub: Per-port setting to use old enumeration scheme
The "old" enumeration scheme is considerably faster (it takes
~244ms instead of ~356ms to get the descriptor).
It is currently only possible to use the old scheme globally
(/sys/module/usbcore/parameters/old_scheme_first), which is not
desirable as the new scheme was introduced to increase compatibility
with more devices.
However, in our case, we care about time-to-active for a specific
USB device (which we make the firmware for), on a specific port
(that is pogo-pin based: not a standard USB port). This new
sysfs option makes it possible to use the old scheme on a single
port only.
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-fs-xfs')
0 files changed, 0 insertions, 0 deletions