From 5f081af6cbb83e72194ad3a82623ca42eeb0e662 Mon Sep 17 00:00:00 2001 From: Geoff Levand Date: Tue, 8 Nov 2011 16:01:18 -0800 Subject: usb: PS3 EHCI QH read work-around commit aaa0ef289afe9186f81e2340114ea413eef0492a upstream. 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 Acked-by: Alan Stern Signed-off-by: Ben Hutchings --- drivers/usb/host/ehci-hcd.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index da2f7118a81c..64c0d7b5a903 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -620,6 +620,7 @@ static int ehci_init(struct usb_hcd *hcd) hw = ehci->async->hw; hw->hw_next = QH_NEXT(ehci, ehci->async->qh_dma); hw->hw_info1 = cpu_to_hc32(ehci, QH_HEAD); + hw->hw_info1 |= cpu_to_hc32(ehci, (1 << 7)); /* I = 1 */ hw->hw_token = cpu_to_hc32(ehci, QTD_STS_HALT); hw->hw_qtd_next = EHCI_LIST_END(ehci); ehci->async->qh_state = QH_STATE_LINKED; -- cgit v1.2.3