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authorAnton Vorontsov <avorontsov@ru.mvista.com>2009-06-18 16:49:01 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-19 16:46:04 -0700
commit5afbf098d171664695db2a7e828e8d96871a01e1 (patch)
tree99e46bb86d1cecd144612d82667ef87cc2c79115
parentfd8a11e100b463811f41266ea3880c830f3359ea (diff)
downloadlinux-5afbf098d171664695db2a7e828e8d96871a01e1.tar.gz
spi_mpc83xx: add small delay after asserting chip-select line
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>
-rw-r--r--drivers/spi/spi_mpc83xx.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/spi/spi_mpc83xx.c b/drivers/spi/spi_mpc83xx.c
index 4988230a7e0..6e0232e65a3 100644
--- a/drivers/spi/spi_mpc83xx.c
+++ b/drivers/spi/spi_mpc83xx.c
@@ -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);