Prior to starting a new transfer, conditionally wait for bus to not be busy.
Reinitialise controller as otherwise operation is not stable. For reference, see linux kernel commit: 9656eeebf3f1dd05376c4c923797369746d9a618
Signed-off-by: Tomas Melin tomas.melin@vaisala.com --- drivers/i2c/xilinx_xiic.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/i2c/xilinx_xiic.c b/drivers/i2c/xilinx_xiic.c index e4ca0ab936..4c2d0edf48 100644 --- a/drivers/i2c/xilinx_xiic.c +++ b/drivers/i2c/xilinx_xiic.c @@ -267,6 +267,15 @@ static void xiic_reinit(struct xilinx_xiic_priv *priv) static int xilinx_xiic_xfer(struct udevice *dev, struct i2c_msg *msg, int nmsgs) { int ret = 0; + struct xilinx_xiic_priv *priv = dev_get_priv(dev); + + ret = wait_for_bit_8(priv->base + XIIC_SR_REG_OFFSET, + XIIC_SR_BUS_BUSY_MASK, false, 3000, true); + + if (ret) + return ret; + + xiic_reinit(priv);
for (; nmsgs > 0; nmsgs--, msg++) { if (msg->flags & I2C_M_RD)