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[stable,4.19+,01/20] i2c: stm32f7: fix first byte to send in slave mode

Message ID 20191115223356.27675-1-mathieu.poirier@linaro.org
State New
Headers show
Series [stable,4.19+,01/20] i2c: stm32f7: fix first byte to send in slave mode | expand

Commit Message

Mathieu Poirier Nov. 15, 2019, 10:33 p.m. UTC 
From: Fabrice Gasnier <fabrice.gasnier@st.com>


commit 915da2b794ce4fc98b1acf64d64354f22a5e4931 upstream

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: 60d609f30de2 ("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>

Cc: stable <stable@vger.kernel.org> # 4.19+
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

---
 drivers/i2c/busses/i2c-stm32f7.c | 2 ++
 1 file changed, 2 insertions(+)

-- 
2.17.1
diff mbox series

Patch

diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
index ac9c9486b834..48521bc8a4d2 100644
--- a/drivers/i2c/busses/i2c-stm32f7.c
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -1177,6 +1177,8 @@  static void stm32f7_i2c_slave_start(struct stm32f7_i2c_dev *i2c_dev)
 			STM32F7_I2C_CR1_TXIE;
 		stm32f7_i2c_set_bits(base + STM32F7_I2C_CR1, mask);
 
+		/* Write 1st data byte */
+		writel_relaxed(value, base + STM32F7_I2C_TXDR);
 	} else {
 		/* Notify i2c slave that new write transfer is starting */
 		i2c_slave_event(slave, I2C_SLAVE_WRITE_REQUESTED, &value);