From: Jan Glauber Date: Tue, 26 Apr 2016 14:26:52 +0000 (+0200) Subject: i2c: octeon: Remove zero-length message support X-Git-Tag: v4.7-rc1~113^2~23 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=392d01de2d2476e8a50cf30f049e369deaaea127;p=karo-tx-linux.git 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 Signed-off-by: Wolfram Sang --- 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; }