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authorStuart_Hayes@Dell.com <Stuart_Hayes@Dell.com>2007-05-03 08:58:49 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2007-07-12 16:29:45 -0700
commit196705c9bbc03540429b0f7cf9ee35c2f928a534 (patch)
tree37ddc23737bced60a8defc52f643f362e2744908 /drivers/usb/host/ehci-mem.c
parentec22559e0b7a05283a3413bda5d177e42c950e23 (diff)
USB: EHCI cpufreq fix
EHCI controllers that don't cache enough microframes can get MMF errors when CPU frequency changes occur between the start and completion of split interrupt transactions, due to delays in reading main memory (caused by CPU cache snoop delays). This patch adds a cpufreq notifier to the EHCI driver that will inactivate split interrupt transactions during frequency transitions. It was tested on Intel ICH7 and Serverworks/Broadcom HT1000 EHCI controllers. Signed-off-by: Stuart Hayes <stuart_hayes@dell.com> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host/ehci-mem.c')
-rw-r--r--drivers/usb/host/ehci-mem.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-mem.c b/drivers/usb/host/ehci-mem.c
index a8ba2e1497a..5cff6bace5e 100644
--- a/drivers/usb/host/ehci-mem.c
+++ b/drivers/usb/host/ehci-mem.c
@@ -94,6 +94,9 @@ static struct ehci_qh *ehci_qh_alloc (struct ehci_hcd *ehci, gfp_t flags)
qh->qh_dma = dma;
// INIT_LIST_HEAD (&qh->qh_list);
INIT_LIST_HEAD (&qh->qtd_list);
+#ifdef CONFIG_CPU_FREQ
+ INIT_LIST_HEAD (&qh->split_intr_qhs);
+#endif
/* dummy td enables safe urb queuing */
qh->dummy = ehci_qtd_alloc (ehci, flags);