From: David Brownell <david-b@pacbell.net>
To: Andrew Morton <akpm@linux-foundation.org>,
Linux Kernel list <linux-kernel@vger.kernel.org>
Cc: Tony Lindgren <tony@atomide.com>,
imre.deak@solidboot.com, spi-devel-general@lists.sourceforge.net
Subject: [patch 2.6.22-rc2-git] omap_uwire: SPI_CPHA mode bugfix
Date: Tue, 22 May 2007 13:58:31 -0700 [thread overview]
Message-ID: <200705221358.32467.david-b@pacbell.net> (raw)
From: Imre Deak <imre.deak@solidboot.com>
The omap_uwire controller driver handles SPI_CPHA incorrectly;
It should mean:
CPHA=0 ... sample at leading edge of clock
CPHA=1 ... sample at trailing edge of clock
This bug has been masked by inverse bugs in layered drivers;
and was uncovered by running some of them on non-OMAP hardware.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
--- o26.orig/drivers/spi/omap_uwire.c 2007-05-22 07:49:52.000000000 -0700
+++ o26/drivers/spi/omap_uwire.c 2007-05-22 08:02:03.000000000 -0700
@@ -358,11 +358,11 @@ static int uwire_setup_transfer(struct s
switch (spi->mode & (SPI_CPOL | SPI_CPHA)) {
case SPI_MODE_0:
case SPI_MODE_3:
- flags |= UWIRE_WRITE_RISING_EDGE | UWIRE_READ_FALLING_EDGE;
+ flags |= UWIRE_WRITE_FALLING_EDGE | UWIRE_READ_RISING_EDGE;
break;
case SPI_MODE_1:
case SPI_MODE_2:
- flags |= UWIRE_WRITE_FALLING_EDGE | UWIRE_READ_RISING_EDGE;
+ flags |= UWIRE_WRITE_RISING_EDGE | UWIRE_READ_FALLING_EDGE;
break;
}
reply other threads:[~2007-05-22 21:02 UTC|newest]
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