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| author | Jan Glauber | 2016-04-26 16:26:52 +0200 |
|---|---|---|
| committer | Wolfram Sang | 2016-04-26 23:02:47 +0200 |
| commit | 392d01de2d2476e8a50cf30f049e369deaaea127 (patch) | |
| tree | 6cef3ad55c638a68599e3cccd194bedc7ecd1d35 /drivers/i2c/busses | |
| parent | i2c: s3c2410: Check clk_prepare_enable() return value (diff) | |
| download | kernel-qcow2-linux-392d01de2d2476e8a50cf30f049e369deaaea127.tar.gz kernel-qcow2-linux-392d01de2d2476e8a50cf30f049e369deaaea127.tar.xz kernel-qcow2-linux-392d01de2d2476e8a50cf30f049e369deaaea127.zip | |
i2c: octeon: Remove zero-length message support
Zero-length message support (SMBUS QUICK or i2c) never worked with
the Octeon hardware. Disable SMBUS QUICK support and bail out in
case of a zero-length i2c request.
After this change 'i2c-detect -q' will return an error on Octeon but
the previously reported results were wrong anyway.
Signed-off-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c/busses')
| -rw-r--r-- | drivers/i2c/busses/i2c-octeon.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/i2c/busses/i2c-octeon.c b/drivers/i2c/busses/i2c-octeon.c index 6a4f0581a7e0..4fc471ce173e 100644 --- a/drivers/i2c/busses/i2c-octeon.c +++ b/drivers/i2c/busses/i2c-octeon.c @@ -838,9 +838,6 @@ static int octeon_i2c_read(struct octeon_i2c *i2c, int target, int i, result, length = *rlength; bool final_read = false; - if (length < 1) - return -EINVAL; - octeon_i2c_data_write(i2c, (target << 1) | 1); octeon_i2c_ctl_write(i2c, TWSI_CTL_ENAB); @@ -926,6 +923,12 @@ static int octeon_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, for (i = 0; ret == 0 && i < num; i++) { struct i2c_msg *pmsg = &msgs[i]; + /* zero-length messages are not supported */ + if (!pmsg->len) { + ret = -EOPNOTSUPP; + break; + } + ret = octeon_i2c_start(i2c); if (ret) return ret; @@ -999,7 +1002,7 @@ static struct i2c_bus_recovery_info octeon_i2c_recovery_info = { static u32 octeon_i2c_functionality(struct i2c_adapter *adap) { - return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | + return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK) | I2C_FUNC_SMBUS_READ_BLOCK_DATA | I2C_SMBUS_BLOCK_PROC_CALL; } |