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| author |   Nicolas Boichat <drinkcat@chromium.org> | 2018-05-28 14:32:19 +0800 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-31 12:48:17 +0200 |
| commit | aa071a92bbf09d993ff0dbf3b1f2b53ac93ad654 (patch) | |
| tree | a6c57deabc0ca7ac0eb080aa3a0d061db8517945 /include/linux/usb.h | |
| parent | usb: hub: Per-port setting to use old enumeration scheme (diff) | |
| download | linux-dev-aa071a92bbf09d993ff0dbf3b1f2b53ac93ad654.tar.xz linux-dev-aa071a92bbf09d993ff0dbf3b1f2b53ac93ad654.zip | |
usb: hub: Per-port setting to reduce TRSTRCY to 10 ms
Currently, the USB hub core waits for 50 ms after enumerating the
device. This was added to help "some high speed devices" to
enumerate (b789696af8 "[PATCH] USB: relax usbcore reset timings").
On some devices, the time-to-active is important, so we provide
a per-port option to reduce the time to what the USB specification
requires: 10 ms.
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/usb.h')
| -rw-r--r-- | include/linux/usb.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/usb.h b/include/linux/usb.h index 2ade17992ed6..4cdd515a4385 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -496,6 +496,9 @@ enum usb_port_connect_type { /* For the given port, prefer the old (faster) enumeration scheme. */ #define USB_PORT_QUIRK_OLD_SCHEME BIT(0) +/* Decrease TRSTRCY to 10ms during device enumeration. */ +#define USB_PORT_QUIRK_FAST_ENUM BIT(1) + /* * USB 2.0 Link Power Management (LPM) parameters. */ |