In case we receive NACK on DATA we shouldn't be resetting the controller,
rather we should issue STOP command. This will terminate the current
transaction and -EIO is returned.
While at that handle the SMBus Quick Command properly.
We shouldn't be setting the XLP9XX_I2C_CMD_READ/WRITE for such
transactions.
Signed-off-by: George Cherian <george.cher...@cavium.com>
---
drivers/i2c/busses/i2c-xlp9xx.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/drivers/i2c/busses/i2c-xlp9xx.c b/drivers/i2c/busses/i2c-xlp9xx.c
index 42dd1fa..eb8913e 100644
--- a/drivers/i2c/busses/i2c-xlp9xx.c
+++ b/drivers/i2c/busses/i2c-xlp9xx.c
@@ -352,7 +352,9 @@ static int xlp9xx_i2c_xfer_msg(struct xlp9xx_i2c_dev *priv,
struct i2c_msg *msg,
/* set cmd reg */
cmd = XLP9XX_I2C_CMD_START;
- cmd |= (priv->msg_read ? XLP9XX_I2C_CMD_READ : XLP9XX_I2C_CMD_WRITE);
+ if (msg->len)
+ cmd |= (priv->msg_read ?
+ XLP9XX_I2C_CMD_READ : XLP9XX_I2C_CMD_WRITE);
if (last_msg)
cmd |= XLP9XX_I2C_CMD_STOP;
@@ -361,12 +363,12 @@ static int xlp9xx_i2c_xfer_msg(struct xlp9xx_i2c_dev
*priv, struct i2c_msg *msg,
timeleft = msecs_to_jiffies(XLP9XX_I2C_TIMEOUT_MS);
timeleft = wait_for_completion_timeout(&priv->msg_complete, timeleft);
- if (priv->msg_err) {
+ if (priv->msg_err & XLP9XX_I2C_INTEN_BUSERR) {
dev_dbg(priv->dev, "transfer error %x!\n", priv->msg_err);
- if (priv->msg_err & XLP9XX_I2C_INTEN_BUSERR)
- xlp9xx_i2c_init(priv);
- return (priv->msg_err & XLP9XX_I2C_INTEN_NACKADDR) ?
- -ENXIO : -EIO;
+ xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CMD, XLP9XX_I2C_CMD_STOP);
+ return -EIO;
+ } else if (priv->msg_err & XLP9XX_I2C_INTEN_NACKADDR) {
+ return -ENXIO;
}
if (timeleft == 0) {
--
2.1.4
