Commit 7513e006 authored by Michael Hennerich's avatar Michael Hennerich Committed by Linus Torvalds
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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: default avatarMichael Hennerich <michael.hennerich@analog.com>
Signed-off-by: default avatarBryan Wu <cooloney@kernel.org>
Acked-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 8cf5858c
......@@ -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
......
......@@ -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;
}
......
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