Commit 7513e006 authored Apr 06, 2009 by Michael Hennerich Committed by Linus Torvalds Apr 07, 2009

Blackfin SPI Driver: Fix erroneous SPI Clock divisor calculation



Fix erroneous SPI Clock divisor calculation.  Make sure SPI_BAUD is always
>= 2.  Writing a value of 0 or 1 to the SPI_BAUD register disables the
serial clock.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
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>

parent 8cf5858c

arch/blackfin/include/asm/bfin5xx_spi.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -11,6 +11,8 @@
		#ifndef _SPI_CHANNEL_H_
		#define _SPI_CHANNEL_H_

		#define MIN_SPI_BAUD_VAL 2

		#define SPI_READ 0
		#define SPI_WRITE 1

drivers/spi/spi_bfin5xx.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -158,6 +158,9 @@ static u16 hz_to_spi_baud(u32 speed_hz)
		if ((sclk % (2 * speed_hz)) > 0)
		spi_baud++;

		if (spi_baud < MIN_SPI_BAUD_VAL)
		spi_baud = MIN_SPI_BAUD_VAL;

		return spi_baud;
		}