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| author | Haavard Skinnemoen <hskinnemoen@atmel.com> | 2008-02-06 09:38:11 (GMT) |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-06 18:41:10 (GMT) |
| commit | 1eed29df472a33bba013d5a2ea2f9e32f4414397 (patch) | |
| tree | 857d8c03baab8c845cd94cd601caab05e57dcb5b /virt | |
| parent | 3c72426f0539c1abce17918d1456f7a6a5a11f90 (diff) | |
| download | linux-fsl-qoriq-1eed29df472a33bba013d5a2ea2f9e32f4414397.tar.xz | |
atmel_spi throughput improvement
Don't insert (undesirable) delays between consecutive words (DLYBCT) or when
activating chipselects (DLYBS).
Removing the between-word delays improves the performance of bulk transfers
(such as mtd_dataflash, m25p80, mmc_spi) significantly. In one test, the
improvement was a factor of more than eight!
(The large DLYBCT value came from the legacy at91 SPI driver, and it's not
clear why it used such a huge value.)
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'virt')
0 files changed, 0 insertions, 0 deletions