diff options
| author | Fabrice Gasnier <fabrice.gasnier@st.com> | 2019-09-30 17:28:01 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-10 11:34:26 +0100 |
| commit | 8b3153fb1a64764bf5b7a25fd02735a91648693a (patch) | |
| tree | 2e473f5cbcb07a1358169f18229f563f7b9fb310 /drivers | |
| parent | 9a41a6084fd35f3f0efbb4f12796e21733a816b2 (diff) | |
i2c: stm32f7: fix first byte to send in slave mode
[ Upstream commit 02e64276c6dbcc4c5f39844f33d18180832a58f3 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/i2c/busses/i2c-stm32f7.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c index 266d1c269b83..0af9219e45f7 100644 --- a/drivers/i2c/busses/i2c-stm32f7.c +++ b/drivers/i2c/busses/i2c-stm32f7.c @@ -1192,6 +1192,8 @@ 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); |