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| author | Ming Lei <ming.lei@canonical.com> | 2011-08-30 16:03:13 +0000 |
|---|---|---|
| committer | Benoit Goby <benoit@android.com> | 2011-09-06 17:40:39 -0700 |
| commit | 95cf7a199cf8bcd6647c3b90efb78614157bf766 (patch) | |
| tree | bf71c1c9a80c8d74b479f9a68a3b9132947c38a5 /drivers/net/wireless/bcmdhd/wl_cfgp2p.h | |
| parent | 7013f4976374ea75cb35446393be7bdc37bf607f (diff) | |
| download | kernel_samsung_crespo-95cf7a199cf8bcd6647c3b90efb78614157bf766.zip kernel_samsung_crespo-95cf7a199cf8bcd6647c3b90efb78614157bf766.tar.gz kernel_samsung_crespo-95cf7a199cf8bcd6647c3b90efb78614157bf766.tar.bz2 | |
usb: ehci: make HC see up-to-date qh/qtd descriptor ASAP
This patch introduces the helper of ehci_sync_mem to flush
qtd/qh into memory immediately on some ARM, so that HC can
see the up-to-date qtd/qh descriptor asap.
This patch fixs one performance bug on ARM Cortex A9 dual core
platform, which has been reported on quite a few ARM machines
(OMAP4, Tegra 2, snowball...), see details from link of
https://bugs.launchpad.net/bugs/709245.
The patch has been tested ok on OMAP4 panda A1 board, and the
performance of 'dd' over usb mass storage can be increased from
4~5MB/sec to 14~16MB/sec after applying this patch.
Change-Id: I7994c58a1001c7f46f13e09420328a3916bbfcef
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Diffstat (limited to 'drivers/net/wireless/bcmdhd/wl_cfgp2p.h')
0 files changed, 0 insertions, 0 deletions