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i2c: mxs: handle spurious interrupt
After an error interrupt setting cmd->err, I see another interrupt that the data engine is empty which clears cmd->err before being processed. So, clear cmd->err at the beginning of a transfer only to handle these consecutive interrupts. Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
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@ -227,6 +227,7 @@ static int mxs_i2c_xfer_msg(struct i2c_adapter *adap, struct i2c_msg *msg,
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return -EINVAL;
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init_completion(&i2c->cmd_complete);
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i2c->cmd_err = 0;
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flags = stop ? MXS_I2C_CTRL0_POST_SEND_STOP : 0;
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@ -299,8 +300,6 @@ static irqreturn_t mxs_i2c_isr(int this_irq, void *dev_id)
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MXS_I2C_CTRL1_SLAVE_STOP_IRQ | MXS_I2C_CTRL1_SLAVE_IRQ))
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/* MXS_I2C_CTRL1_OVERSIZE_XFER_TERM_IRQ is only for slaves */
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i2c->cmd_err = -EIO;
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else
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i2c->cmd_err = 0;
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is_last_cmd = (readl(i2c->regs + MXS_I2C_QUEUESTAT) &
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MXS_I2C_QUEUESTAT_WRITE_QUEUE_CNT_MASK) == 0;
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