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spi_mpc83xx: add small delay after asserting chip-select line

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This is needed for some underlaying GPIO controllers that may be a bit
slow, or if chip-select signal need some time to stabilize.

For what it's worth, we already have the similar delay for chip-select
de-assertion case.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Cc: Kumar Gala <galak@gate.crashing.org>
Cc: David Brownell <david-b@pacbell.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Anton Vorontsov 2009-06-18 16:49:01 -07:00 committed by Linus Torvalds
parent fd8a11e100
commit 5afbf098d1
1 changed files with 3 additions and 1 deletions
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4
drivers/spi/spi_mpc83xx.c
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@ -383,8 +383,10 @@ static void mpc83xx_spi_work(struct work_struct *work)
break;
}
if (cs_change)
if (cs_change) {
mpc83xx_spi_chipselect(spi, BITBANG_CS_ACTIVE);
ndelay(nsecs);
}
cs_change = t->cs_change;
if (t->len)
status = mpc83xx_spi_bufs(spi, t);