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authorKumar Gala <galak@gate.crashing.org>2006-01-20 13:57:52 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2006-03-20 14:49:55 -0800
commit8cd42e97bf451bbbb2f54dc571366ae5a72faaea (patch)
tree9bd591f62813e477da3484bfe159228a7507eeb7 /drivers/usb/host/ehci-q.c
parent80cb9aee01245b38325dd84f1359b14a3f01f10d (diff)
[PATCH] USB: EHCI and Freescale 83xx quirk
On the MPC834x processors the multiport host (MPH) EHCI controller has an erratum in which the port number in the queue head expects to be 0..N-1 instead of 1..N. If we are on one of these chips we subtract one from the port number before putting it into the queue head. Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host/ehci-q.c')
-rw-r--r--drivers/usb/host/ehci-q.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
index 9b13bf2fa98..6e28e593c04 100644
--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -721,7 +721,14 @@ qh_make (
info1 |= maxp << 16;
info2 |= (EHCI_TUNE_MULT_TT << 30);
- info2 |= urb->dev->ttport << 23;
+
+ /* Some Freescale processors have an erratum in which the
+ * port number in the queue head was 0..N-1 instead of 1..N.
+ */
+ if (ehci_has_fsl_portno_bug(ehci))
+ info2 |= (urb->dev->ttport-1) << 23;
+ else
+ info2 |= urb->dev->ttport << 23;
/* set the address of the TT; for TDI's integrated
* root hub tt, leave it zeroed.