From: Geoff Levand Date: Wed, 9 Nov 2011 00:01:18 +0000 (-0800) Subject: usb: PS3 EHCI QH read work-around X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=aaa0ef289afe9186f81e2340114ea413eef0492a;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git 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 Acked-by: Alan Stern --- diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index e0ca9955880b..9496b7d7ab25 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -670,6 +670,7 @@ 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;