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i2c: imx: Check for I2SR_IAL after every byte
Arbitration Lost (IAL) can happen after every single byte transfer. If arbitration is lost, the I2C hardware will autonomously switch from master mode to slave. If a transfer is not aborted in this state, consecutive transfers will not be executed by the hardware and will timeout. Signed-off-by: Christian Eggers <ceggers@arri.de> Tested (not extensively) on Vybrid VF500 (Toradex VF50): Tested-by: Krzysztof Kozlowski <krzk@kernel.org> Acked-by: Oleksij Rempel <o.rempel@pengutronix.de> Cc: stable@vger.kernel.org Signed-off-by: Wolfram Sang <wsa@kernel.org>
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@ -490,6 +490,16 @@ static int i2c_imx_trx_complete(struct imx_i2c_struct *i2c_imx, bool atomic)
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dev_dbg(&i2c_imx->adapter.dev, "<%s> Timeout\n", __func__);
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return -ETIMEDOUT;
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}
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/* check for arbitration lost */
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if (i2c_imx->i2csr & I2SR_IAL) {
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dev_dbg(&i2c_imx->adapter.dev, "<%s> Arbitration lost\n", __func__);
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i2c_imx_clear_irq(i2c_imx, I2SR_IAL);
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i2c_imx->i2csr = 0;
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return -EAGAIN;
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}
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dev_dbg(&i2c_imx->adapter.dev, "<%s> TRX complete\n", __func__);
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i2c_imx->i2csr = 0;
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return 0;
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