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[PATCH] USB: EHCI and Freescale 83xx quirk

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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>
This commit is contained in:
Kumar Gala
2006-01-20 13:57:52 -08:00
committed by Greg Kroah-Hartman
parent 80cb9aee01
commit 8cd42e97bf
3 changed files with 33 additions and 1 deletions
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9
drivers/usb/host/ehci-q.c
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@@ -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.