linux-kernel - [PATCH 02/16] Blackfin SPI Driver: Fix erroneous SPI Clock divisor calculation

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Date:	Tue, 18 Nov 2008 15:52:26 +0800
From:	Bryan Wu <cooloney@...nel.org>
To:	dbrownell@...rs.sourceforge.net,
	spi-devel-general@...ts.sourceforge.net
Cc:	linux-kernel@...r.kernel.org,
	Michael Hennerich <michael.hennerich@...log.com>,
	Bryan Wu <cooloney@...nel.org>
Subject: [PATCH 02/16] Blackfin SPI Driver: Fix erroneous SPI Clock divisor calculation

From: Michael Hennerich <michael.hennerich@...log.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@...log.com>
Signed-off-by: Bryan Wu <cooloney@...nel.org>
---
 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 9fa1915..b16c3cd 100644
--- a/arch/blackfin/include/asm/bfin5xx_spi.h
+++ b/arch/blackfin/include/asm/bfin5xx_spi.h
@@ -21,6 +21,8 @@
 #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 e9b7366..a38106a 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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