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| author | Joakim Tjernlund <Joakim.Tjernlund@transmode.se> | 2009-09-22 13:40:44 +0200 |
|---|---|---|
| committer | Heiko Schocher <hs@denx.de> | 2009-09-28 07:35:56 +0200 |
| commit | d1c9e5b37901b53ffc1ce3f08ec8ed61bfd557b6 (patch) | |
| tree | 78182e8bca0369b4bbd625da4a41cf0c5267535e /drivers | |
| parent | 99404202127346b9e91503bbd69deafa18c980c4 (diff) | |
| download | u-boot-imx-d1c9e5b37901b53ffc1ce3f08ec8ed61bfd557b6.zip u-boot-imx-d1c9e5b37901b53ffc1ce3f08ec8ed61bfd557b6.tar.gz u-boot-imx-d1c9e5b37901b53ffc1ce3f08ec8ed61bfd557b6.tar.bz2 | |
fsl_i2c: Do not generate STOP after read.
__i2c_read always ends with a STOP condition thereby releasing
the bus. It is cleaner to do the STOP magic in i2c_read(), like
i2c_write() does. This may also help future multimaster systems which
wants to hold on to the bus until all transactions are finished.
Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/i2c/fsl_i2c.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/i2c/fsl_i2c.c b/drivers/i2c/fsl_i2c.c index 4d5552b..2241990 100644 --- a/drivers/i2c/fsl_i2c.c +++ b/drivers/i2c/fsl_i2c.c @@ -353,9 +353,10 @@ __i2c_read(u8 *data, int length) writeb(I2C_CR_MEN | I2C_CR_MSTA | I2C_CR_TXAK, &i2c_dev[i2c_bus_num]->cr); - /* Generate stop on last byte */ + /* Do not generate stop on last byte */ if (i == length - 1) - writeb(I2C_CR_MEN | I2C_CR_TXAK, &i2c_dev[i2c_bus_num]->cr); + writeb(I2C_CR_MEN | I2C_CR_MSTA | I2C_CR_MTX, + &i2c_dev[i2c_bus_num]->cr); data[i] = readb(&i2c_dev[i2c_bus_num]->dr); } @@ -378,11 +379,11 @@ i2c_read(u8 dev, uint addr, int alen, u8 *data, int length) && i2c_write_addr(dev, I2C_READ_BIT, 1) != 0) i = __i2c_read(data, length); - if (length && i2c_wait4bus()) /* Wait until STOP */ - debug("i2c_read: wait4bus timed out\n"); - writeb(I2C_CR_MEN, &i2c_dev[i2c_bus_num]->cr); + if (i2c_wait4bus()) /* Wait until STOP */ + debug("i2c_read: wait4bus timed out\n"); + if (i == length) return 0; |