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i2c: stm32f7: fix first byte to send in slave mode
The slave-interface documentation [1] states "the bus driver should
transmit the first byte" upon I2C_SLAVE_READ_REQUESTED slave event:
- 'val': backend returns first byte to be sent
The driver currently ignores the 1st byte to send on this event.
[1] https://www.kernel.org/doc/Documentation/i2c/slave-interface
Fixes: 60d609f30d
("i2c: i2c-stm32f7: Add slave support")
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Reviewed-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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@ -1192,6 +1192,8 @@ static void stm32f7_i2c_slave_start(struct stm32f7_i2c_dev *i2c_dev)
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STM32F7_I2C_CR1_TXIE;
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stm32f7_i2c_set_bits(base + STM32F7_I2C_CR1, mask);
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/* Write 1st data byte */
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writel_relaxed(value, base + STM32F7_I2C_TXDR);
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} else {
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/* Notify i2c slave that new write transfer is starting */
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i2c_slave_event(slave, I2C_SLAVE_WRITE_REQUESTED, &value);
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