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| author |   Alain Volmat <alain.volmat@st.com> | 2019-10-15 15:03:09 +0200 |
|---|---|---|
| committer |   Wolfram Sang <wsa@the-dreams.de> | 2019-10-26 16:37:16 +0200 |
| commit | 52d3be711e065a97a57c2f2ffba3098748855bd6 (patch) | |
| tree | ebf8d57000a7a32fe29d8743818d04d27e72a23e /drivers/i2c | |
| parent | i2c: i801: Add support for Intel Comet Lake PCH-H (diff) | |
| download | linux-dev-52d3be711e065a97a57c2f2ffba3098748855bd6.tar.xz linux-dev-52d3be711e065a97a57c2f2ffba3098748855bd6.zip | |
i2c: stm32f7: rework slave_id allocation
The IP can handle two slave addresses. One address can either be
7 bits or 10 bits while the other can only be 7 bits.
In order to ensure that a 10 bits address can always be allocated
(assuming there is only one 7 bits address already allocated),
pick up the 7-bits only address slot in priority when performing a 7-bits
address allocation.
Fixes: 60d609f30de2 ("i2c: i2c-stm32f7: Add slave support")
Signed-off-by: Alain Volmat <alain.volmat@st.com>
Reviewed-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-stm32f7.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c index d36cf08461f7..cfae01b15243 100644 --- a/drivers/i2c/busses/i2c-stm32f7.c +++ b/drivers/i2c/busses/i2c-stm32f7.c @@ -1265,7 +1265,7 @@ static int stm32f7_i2c_get_free_slave_id(struct stm32f7_i2c_dev *i2c_dev, * slave[0] supports 7-bit and 10-bit slave address * slave[1] supports 7-bit slave address only */ - for (i = 0; i < STM32F7_I2C_MAX_SLAVE; i++) { + for (i = STM32F7_I2C_MAX_SLAVE - 1; i >= 0; i--) { if (i == 1 && (slave->flags & I2C_CLIENT_PEC)) continue; if (!i2c_dev->slave[i]) { |