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| author | Reinhard Pfau <pfau@gdsys.de> | 2013-06-26 15:55:14 +0200 |
|---|---|---|
| committer | Andy Fleming <afleming@freescale.com> | 2013-07-16 17:44:30 -0500 |
| commit | b778c1b5debc4176baf93ed5085498e603f99343 (patch) | |
| tree | 7407277be12748865e299c7facee99f7589ea752 /drivers/i2c | |
| parent | be6c1529c1ce9718cc955f23fdaa5891d15b6551 (diff) | |
| download | u-boot-imx-b778c1b5debc4176baf93ed5085498e603f99343.zip u-boot-imx-b778c1b5debc4176baf93ed5085498e603f99343.tar.gz u-boot-imx-b778c1b5debc4176baf93ed5085498e603f99343.tar.bz2 | |
i2c: fsl_i2c: i2c_read(): dont try to write address w/ alen=0
if alen is 0: no longer start a write cycle before reading data.
Signed-off-by: Dirk Eibach <dirk.eibach@gdsys.cc>
Signed-off-by: Reinhard Pfau <reinhard.pfau@gdsys.cc>
Acked-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Andy Fleming <afleming@freescale.com>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/fsl_i2c.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/i2c/fsl_i2c.c b/drivers/i2c/fsl_i2c.c index 1c7265d..5d7e010 100644 --- a/drivers/i2c/fsl_i2c.c +++ b/drivers/i2c/fsl_i2c.c @@ -383,13 +383,16 @@ i2c_read(u8 dev, uint addr, int alen, u8 *data, int length) int i = -1; /* signal error */ u8 *a = (u8*)&addr; - if (i2c_wait4bus() >= 0 + if (i2c_wait4bus() < 0) + return -1; + + if ((!length || alen > 0) && i2c_write_addr(dev, I2C_WRITE_BIT, 0) != 0 && __i2c_write(&a[4 - alen], alen) == alen) i = 0; /* No error so far */ - if (length - && i2c_write_addr(dev, I2C_READ_BIT, 1) != 0) + if (length && + i2c_write_addr(dev, I2C_READ_BIT, alen ? 1 : 0) != 0) i = __i2c_read(data, length); writeb(I2C_CR_MEN, &i2c_dev[i2c_bus_num]->cr); |