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| author | Guennadi Liakhovetski | 2011-01-21 16:56:42 +0100 |
|---|---|---|
| committer | Grant Likely | 2011-01-21 18:02:35 +0100 |
| commit | 9dabb3f3269d042908bf1f4e685413c39cc8c373 (patch) | |
| tree | a6913470397af37729670966b9683aec48edb525 /mm/bootmem.c | |
| parent | spi/spi_sh_msiof: cosmetic clean-up (diff) | |
| download | kernel-qcow2-linux-9dabb3f3269d042908bf1f4e685413c39cc8c373.tar.gz kernel-qcow2-linux-9dabb3f3269d042908bf1f4e685413c39cc8c373.tar.xz kernel-qcow2-linux-9dabb3f3269d042908bf1f4e685413c39cc8c373.zip | |
spi/spi_sh_msiof: consolidate data in 8-bit mode into 32-bit words
Instead of sending data 8 bits at a time in 8-bit SPI mode, swap bytes
and send and receive them 32 bits at a time. Tested with an SD-card,
with which this patch reduced the number of interrupts by 50%, when
reading 5MiB of data (there are also small service packets, the number
of interrupts, produced by 512-byte sectors should, of course, drop by
75%), and improved throughput by more than 40%.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'mm/bootmem.c')
0 files changed, 0 insertions, 0 deletions