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Koen Kooi
189ce92b4c
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net> Signed-off-by: Denys Dmytriyenko <denys@ti.com>
37 lines
1.4 KiB
Diff
37 lines
1.4 KiB
Diff
From 8358979f2727e09ed8658dfbc95fa3ffdbbdac75 Mon Sep 17 00:00:00 2001
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From: Geoff Levand <geoff@infradead.org>
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Date: Tue, 8 Nov 2011 16:01:18 -0800
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Subject: [PATCH 61/67] usb: PS3 EHCI QH read work-around
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commit aaa0ef289afe9186f81e2340114ea413eef0492a upstream.
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PS3 EHCI HC errata fix 244. The SCC EHCI HC will not correctly perform QH
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reads that occur near or span a micro-frame boundry. This is due to a problem
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in the Nak Count Reload Control logic (EHCI Specification 1.0 Section 4.9.1).
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The work-around for this problem is for the HC driver to set I=1 (inactive) for
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QHs with H=1 (list head).
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Signed-off-by: Geoff Levand <geoff@infradead.org>
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Acked-by: Alan Stern <stern@rowland.harvard.edu>
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Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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---
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drivers/usb/host/ehci-hcd.c | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
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index da2f711..64c0d7b 100644
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--- a/drivers/usb/host/ehci-hcd.c
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+++ b/drivers/usb/host/ehci-hcd.c
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@@ -620,6 +620,7 @@ static int ehci_init(struct usb_hcd *hcd)
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hw = ehci->async->hw;
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hw->hw_next = QH_NEXT(ehci, ehci->async->qh_dma);
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hw->hw_info1 = cpu_to_hc32(ehci, QH_HEAD);
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+ hw->hw_info1 |= cpu_to_hc32(ehci, (1 << 7)); /* I = 1 */
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hw->hw_token = cpu_to_hc32(ehci, QTD_STS_HALT);
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hw->hw_qtd_next = EHCI_LIST_END(ehci);
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ehci->async->qh_state = QH_STATE_LINKED;
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--
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1.7.9.5
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