spi/spi_sh_msiof: consolidate data in 8-bit mode into 32-bit words

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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>

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Guennadi Liakhovetski 2011-01-21 16:56:42 +01:00 • committed by Grant Likely

parent e2dbf5ebcc

commit 9dabb3f326

1 changed files with 59 additions and 0 deletions

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drivers/spi/spi_sh_msiof.c

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