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i2c: designware: report short transfers

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Rather than reporting success for a short transfer due to interrupt
latency, report an error both to the caller, as well as to the kernel
log.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Russell King 2016-11-18 19:40:04 +00:00 committed by Wolfram Sang
parent 9c763584b7
commit 2bf413d56b
1 changed files with 6 additions and 1 deletions
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7
drivers/i2c/busses/i2c-designware-core.c
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@ -758,7 +758,7 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
}
/* no error */
if (likely(!dev->cmd_err)) {
if (likely(!dev->cmd_err && !dev->status)) {
ret = num;
goto done;
}
@ -768,6 +768,11 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
ret = i2c_dw_handle_tx_abort(dev);
goto done;
}
if (dev->status)
dev_err(dev->dev,
"transfer terminated early - interrupt latency too high?\n");
ret = -EIO;
done: