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-rw-r--r--drivers/usb/host/Kconfig20
1 files changed, 19 insertions, 1 deletions
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index e27b79a3c05f..c060eb9b3b19 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -47,7 +47,25 @@ config USB_EHCI_ROOT_HUB_TT
controller is needed. It's safe to say "y" even if your
controller doesn't support this feature.
- This supports the EHCI implementation from TransDimension Inc.
+ This supports the EHCI implementation that's originally
+ from ARC, and has since changed hands a few times.
+
+config USB_EHCI_TT_NEWSCHED
+ bool "Improved Transaction Translator scheduling (EXPERIMENTAL)"
+ depends on USB_EHCI_HCD && EXPERIMENTAL
+ ---help---
+ This changes the periodic scheduling code to fill more of the low
+ and full speed bandwidth available from the Transaction Translator
+ (TT) in USB 2.0 hubs. Without this, only one transfer will be
+ issued in each microframe, significantly reducing the number of
+ periodic low/fullspeed transfers possible.
+
+ If you have multiple periodic low/fullspeed devices connected to a
+ highspeed USB hub which is connected to a highspeed USB Host
+ Controller, and some of those devices will not work correctly
+ (possibly due to "ENOSPC" or "-28" errors), say Y.
+
+ If unsure, say N.
config USB_ISP116X_HCD
tristate "ISP116X HCD support"