lkml.org 
[lkml]   [2009]   [Feb]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 02/20] Blackfin SPI Driver: Fix erroneous SPI Clock divisor calculation
Date
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

\
 
 \ /
  Last update: 2009-02-06 08:15    [W:0.116 / U:39.404 seconds]
©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site