atmel_spi: work-around required for new HW bug in AT91SAM9263 Rev.B SPI controller
authorJean-Christophe Lallemand <jcl@develtech.com>
Wed, 12 Nov 2008 21:27:00 +0000 (13:27 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 13 Nov 2008 01:17:17 +0000 (17:17 -0800)
commit50d7d5bf3168db5d04566dd7ffb9a820e9fdf484
tree55eba6757e8068e2a85d886d99701118f73f9170
parent79b92f2bab0dc5ac70e8391548f75ac3268426e4
atmel_spi: work-around required for new HW bug in AT91SAM9263 Rev.B SPI controller

We're working with an AT91SAM9263 Rev B in our design and I experienced
some inconsistency in spi-based touchscreen usage between our board and
the Atmel evaluation kit we have that runs on a Rev A chip.

The data was apparently delayed by 1 byte and got ridiculous data out of
the touchscreen driver, very strange.  As everything looked normal in
the spi, touchscreen and dma logs, I contacted the Atmel support and
they triggered me on a new HW bug that appeared in the Rev B SPI
controller.

The problem is that the SPI controller on the Rev B needs that the
software reset is performed two times so that it's performed correctly.

Applying the patch below solves the issue on my Rev B board.  I've tested
it as well on my Rev A evaluation kit and it has apparently no unwanted
side effect, things continue to work as expected.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/spi/atmel_spi.c