From 5afbf098d171664695db2a7e828e8d96871a01e1 Mon Sep 17 00:00:00 2001 From: Anton Vorontsov Date: Thu, 18 Jun 2009 16:49:01 -0700 Subject: [PATCH] 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 Cc: Kumar Gala Cc: David Brownell Cc: Benjamin Herrenschmidt Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/spi/spi_mpc83xx.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi_mpc83xx.c b/drivers/spi/spi_mpc83xx.c index 4988230..6e0232e 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); -- 2.7.4