From ba47f66bd9fc451e9ce88f291e057b2f4910d01c Mon Sep 17 00:00:00 2001 From: Dan Streetman Date: Wed, 24 May 2006 09:39:16 -0700 Subject: [PATCH] improved TT scheduling for EHCI This updates the EHCI driver by adding an improved scheduler for the transaction translators, found in USB 2.0 hubs and used for low and full speed devices. - adds periodic_tt_usecs() and some helper functions, which does the same thing that "periodic_usecs" does, except on the other side of the TT, i.e. it calculates the low/fullspeed bandwidth usage instead of highspeed. - adds a tt_available() function which is the new implementation of what tt_no_collision() does ... while tt_no_collision() ensures that each TT handles only 1 periodic transfer at a time (a very pessimistic approach) this version instead tracks bandwidth and allows each TT to handle as many transfers as will fit on each TT's downstream bus (closer to best-case). The new scheduler is selected by a config option, marked as EXPERIMENTAL so it can be tested (and more broadly reviewed) for a while until it seems safe to remove the original scheduler. Signed-off-by: Dan Streetman Signed-off-by: David Brownell Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/Kconfig | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) (limited to 'drivers/usb/host/Kconfig') 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" -- cgit v1.2.3 From 5a9d6e0632b867ca71d3ee1e7e5c2365b6711031 Mon Sep 17 00:00:00 2001 From: Jean-Luc Leger Date: Fri, 23 Jun 2006 02:05:21 -0700 Subject: [PATCH] clean up default value of USB_ISP116X_HCD, USB_SL811_HCD and USB_SL811_CS Default values for boolean and tristate options can only be 'y', 'm' or 'n'. This patch removes wrong default for USB_ISP116X_HCD, USB_SL811_HCD and USB_SL811_CS. Signed-off-by: Jean-Luc Leger Cc: Greg KH Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/usb/host/Kconfig | 3 --- 1 file changed, 3 deletions(-) (limited to 'drivers/usb/host/Kconfig') diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig index c060eb9b3b19..b93d71d28db7 100644 --- a/drivers/usb/host/Kconfig +++ b/drivers/usb/host/Kconfig @@ -70,7 +70,6 @@ config USB_EHCI_TT_NEWSCHED config USB_ISP116X_HCD tristate "ISP116X HCD support" depends on USB - default N ---help--- The ISP1160 and ISP1161 chips are USB host controllers. Enable this option if your board has this chip. If unsure, say N. @@ -145,7 +144,6 @@ config USB_UHCI_HCD config USB_SL811_HCD tristate "SL811HS HCD support" depends on USB - default N help The SL811HS is a single-port USB controller that supports either host side or peripheral side roles. Enable this option if your @@ -158,7 +156,6 @@ config USB_SL811_HCD config USB_SL811_CS tristate "CF/PCMCIA support for SL811HS HCD" depends on USB_SL811_HCD && PCMCIA - default N help Wraps a PCMCIA driver around the SL811HS HCD, supporting the RATOC REX-CFU1U CF card (often used with PDAs). If unsure, say N. -- cgit v1.2.3