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i2c: xlp9xx: Handle NACK on DATA properly

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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.cherian@cavium.com>
Reviewed-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
George Cherian 2018-02-27 13:26:19 +00:00 committed by Wolfram Sang
parent d3898a7852
commit e349d7d08e
1 changed files with 8 additions and 6 deletions
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14
drivers/i2c/busses/i2c-xlp9xx.c
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@ -352,7 +352,9 @@ static int xlp9xx_i2c_xfer_msg(struct xlp9xx_i2c_dev *priv, struct i2c_msg *msg,
/* set cmd reg */ /* set cmd reg */
cmd = XLP9XX_I2C_CMD_START; 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) if (last_msg)
cmd |= XLP9XX_I2C_CMD_STOP; 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 = msecs_to_jiffies(XLP9XX_I2C_TIMEOUT_MS);
timeleft = wait_for_completion_timeout(&priv->msg_complete, timeleft); 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); dev_dbg(priv->dev, "transfer error %x!\n", priv->msg_err);
if (priv->msg_err & XLP9XX_I2C_INTEN_BUSERR) xlp9xx_write_i2c_reg(priv, XLP9XX_I2C_CMD, XLP9XX_I2C_CMD_STOP);
xlp9xx_i2c_init(priv); return -EIO;
return (priv->msg_err & XLP9XX_I2C_INTEN_NACKADDR) ? } else if (priv->msg_err & XLP9XX_I2C_INTEN_NACKADDR) {
-ENXIO : -EIO; return -ENXIO;
} }
if (timeleft == 0) { if (timeleft == 0) {