Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit aaa0ef28 authored by Geoff Levand's avatar Geoff Levand
Browse files

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: default avatarGeoff Levand <geoff@infradead.org>
Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
parent df7c1ca2

drivers/usb/host/ehci-hcd.c

+1 −0
Original line number Diff line number Diff line
@@ -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;