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| author | Alan Stern <stern@rowland.harvard.edu> | 2012-07-11 11:22:26 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-07-16 16:54:25 -0700 |
| commit | df2022553dd8d34d49e16c19d851ea619438f0ef (patch) | |
| tree | 9850c967e0fbee1cb99e900c2e60a0ad50b528da /Documentation/frv/features.txt | |
| parent | 314466101c6ae14f6f5db8a86eda1509ba2c02a8 (diff) | |
| download | op-kernel-dev-df2022553dd8d34d49e16c19d851ea619438f0ef.zip op-kernel-dev-df2022553dd8d34d49e16c19d851ea619438f0ef.tar.gz | |
USB: EHCI: use hrtimer for interrupt QH unlink
This patch (as1577) adds hrtimer support for unlinking interrupt QHs
in ehci-hcd. The current code relies on a fixed delay of either 2 or
55 us, which is not always adequate and in any case is totally bogus.
Thanks to internal caching, the EHCI hardware may continue to access
an interrupt QH for more than a millisecond after it has been unlinked.
In fact, the EHCI spec doesn't say how long to wait before using an
unlinked interrupt QH. The patch sets the delay to 9 microframes
minimum, which ought to be adequate.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/frv/features.txt')
0 files changed, 0 insertions, 0 deletions
