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i2c-algo-pca: Let PCA9564 recover from unacked data byte (state 0x30)

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Currently, the i2c-algo-pca driver does nothing if the chip enters state
0x30 (Data byte in I2CDAT has been transmitted; NOT ACK has been
received).  Thus, the i2c bus connected to the controller gets stuck
afterwards.

I have seen this kind of error on a custom board in certain load
situations most probably caused by interference or noise.

A possible reaction is to let the controller generate a STOP condition.
This is documented in the PCA9564 data sheet (2006-09-01) and the same
is done for other NACK states as well.

Further, state 0x38 isn't handled completely, either. Try to do another
START in this case like the data sheet says. As this couldn't be tested,
I've added a comment to try to reset the chip if the START doesn't help
as suggested by Wolfram Sang.

Signed-off-by: Enrik Berkhan <Enrik.Berkhan@ge.com>
Reviewed-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Enrik Berkhan 2009-05-05 08:39:25 +02:00 committed by Jean Delvare
parent 0cdba07bb2
commit 2196d1cf4a
1 changed files with 11 additions and 0 deletions
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11
drivers/i2c/algos/i2c-algo-pca.c
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@ -287,10 +287,21 @@ static int pca_xfer(struct i2c_adapter *i2c_adap,
case 0x30: /* Data byte in I2CDAT has been transmitted; NOT ACK has been received */ case 0x30: /* Data byte in I2CDAT has been transmitted; NOT ACK has been received */
DEB2("NOT ACK received after data byte\n"); DEB2("NOT ACK received after data byte\n");
pca_stop(adap);
goto out; goto out;
case 0x38: /* Arbitration lost during SLA+W, SLA+R or data bytes */ case 0x38: /* Arbitration lost during SLA+W, SLA+R or data bytes */
DEB2("Arbitration lost\n"); DEB2("Arbitration lost\n");
/*
* The PCA9564 data sheet (2006-09-01) says "A
* START condition will be transmitted when the
* bus becomes free (STOP or SCL and SDA high)"
* when the STA bit is set (p. 11).
*
* In case this won't work, try pca_reset()
* instead.
*/
pca_start(adap);
goto out; goto out;
case 0x58: /* Data byte has been received; NOT ACK has been returned */ case 0x58: /* Data byte has been received; NOT ACK has been returned */