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usb: PS3 EHCI QH read work-around
authorGeoff Levand <geoff@infradead.org>
Wed, 9 Nov 2011 00:01:18 +0000 (16:01 -0800)
committerGeoff Levand <geoff@infradead.org>
Fri, 9 Dec 2011 18:48:00 +0000 (10:48 -0800)
commit50ebb20242267d38d09826116d6793c5e33c5291
tree0beaecc5c1de54558ce6aad072dcdcc731595d15tree | snapshot
parent43d30b82bdca96389d143a985ed0348445b7dcaecommit | diff
usb: PS3 EHCI QH read work-around

PS3 EHCI HC errata fix 244.  The SCC EHCI HC will not correctly perform QH
reads that occur near or span a micro-frame boundry.  This is due to a problem
in the Nak Count Reload Control logic (EHCI Specification 1.0 Section 4.9.1).

The work-around for this problem is for the HC driver to set I=1 (inactive) for
QHs with H=1 (list head).

Signed-off-by: Geoff Levand <geoff@infradead.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
drivers/usb/host/ehci-hcd.c diff | blob | history
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