Messages in this thread Patch in this message | | | From | Bryan Wu <> | Subject | [PATCH 02/20] Blackfin SPI Driver: Fix erroneous SPI Clock divisor calculation | Date | Fri, 6 Feb 2009 15:12:50 +0800 |
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From: Michael Hennerich <michael.hennerich@analog.com>
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> --- arch/blackfin/include/asm/bfin5xx_spi.h | 2 ++ drivers/spi/spi_bfin5xx.c | 3 +++ 2 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/arch/blackfin/include/asm/bfin5xx_spi.h b/arch/blackfin/include/asm/bfin5xx_spi.h index 1306e6b..e1bb164 100644 --- a/arch/blackfin/include/asm/bfin5xx_spi.h +++ b/arch/blackfin/include/asm/bfin5xx_spi.h @@ -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 diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c index 590f975..f2e18f7 100644 --- a/drivers/spi/spi_bfin5xx.c +++ b/drivers/spi/spi_bfin5xx.c @@ -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; } -- 1.5.6.3
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