Commit 5afbf098 authored Jun 18, 2009 by Anton Vorontsov Committed by Linus Torvalds Jun 19, 2009

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>

parent fd8a11e1

drivers/spi/spi_mpc83xx.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -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);