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| author | Stuart_Hayes@Dell.com <Stuart_Hayes@Dell.com> | 2007-05-03 08:58:49 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-07-12 16:29:45 -0700 |
| commit | 196705c9bbc03540429b0f7cf9ee35c2f928a534 (patch) | |
| tree | 37ddc23737bced60a8defc52f643f362e2744908 /drivers/usb/host/ehci-mem.c | |
| parent | ec22559e0b7a05283a3413bda5d177e42c950e23 (diff) | |
| download | linux-196705c9bbc03540429b0f7cf9ee35c2f928a534.tar.gz linux-196705c9bbc03540429b0f7cf9ee35c2f928a534.tar.bz2 linux-196705c9bbc03540429b0f7cf9ee35c2f928a534.zip | |
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.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-mem.c b/drivers/usb/host/ehci-mem.c index a8ba2e1497a4..5cff6bace5e5 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); |