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List:       linux-usb
Subject:    [PATCH] EHCI: make CONFIG_USB_EHCI_TT_NEWSCHED default to Y
From:       Alan Stern <stern () rowland ! harvard ! edu>
Date:       2010-05-21 21:08:21
Message-ID: Pine.LNX.4.44L0.1005211706390.4257-100000 () iolanthe ! rowland ! org
[Download RAW message or body]

This patch (as1382) changes the USB_EHCI_TT_NEWSCHED Kconfig option to
be non-experimental and to default to Y.  This option has existed for
a long time, and I have not heard any complaints concerning it.  By
contrast, several people have reported that their devices could be
made to work only by enabling the option.

The point of changing the default is to cause the option to be enabled
by distros that simply use the default settings for esoteric things
like this.

This change was motivated by Bugzilla #15649.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: David Brownell <david-b@pacbell.net>

---

Index: usb-2.6/drivers/usb/host/Kconfig
===================================================================
--- usb-2.6.orig/drivers/usb/host/Kconfig
+++ usb-2.6/drivers/usb/host/Kconfig
@@ -72,8 +72,9 @@ config USB_EHCI_ROOT_HUB_TT
 	  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
+	bool "Improved Transaction Translator scheduling"
+	depends on USB_EHCI_HCD
+	default y
 	---help---
 	  This changes the periodic scheduling code to fill more of the low
 	  and full speed bandwidth available from the Transaction Translator
@@ -84,9 +85,11 @@ config USB_EHCI_TT_NEWSCHED
 	  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.
+	  (possibly due to "ENOSPC" or "-28" errors), say Y.  Conversely, if
+	  you have only one such device and it doesn't work, you could try
+	  saying N.
 
-	  If unsure, say N.
+	  If unsure, say Y.
 
 config USB_EHCI_BIG_ENDIAN_MMIO
 	bool

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