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xilinx_xiic: Fix transfer initialisation

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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 9656eeebf3f1 ("i2c: Revert i2c: xiic: Do not reset controller before every transfer")

hs: Fixed DOS line endings
    added missing '\n'
    Fixed git commit description style

Signed-off-by: Tomas Melin <tomas.melin@vaisala.com>
This commit is contained in:
Melin Tomas 2019-06-28 12:08:40 +00:00 • committed by Heiko Schocher
parent 5324e8ef6c
commit d3826fb052
1 changed files with 12 additions and 0 deletions
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12
drivers/i2c/xilinx_xiic.c
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@ -266,8 +266,20 @@ static void xiic_reinit(struct xilinx_xiic_priv *priv)
static int xilinx_xiic_xfer(struct udevice *dev, struct i2c_msg *msg, int nmsgs)
{
struct xilinx_xiic_priv *priv = dev_get_priv(dev);
int ret = 0;
ret = wait_for_bit_8(priv->base + XIIC_SR_REG_OFFSET,
XIIC_SR_BUS_BUSY_MASK, false, 1000, true);
if (ret == -ETIMEDOUT)
dev_err(dev, "timeout waiting for bus not busy condition\n");
if (ret)
return ret;
xiic_reinit(priv);
for (; nmsgs > 0; nmsgs--, msg++) {
if (msg->flags & I2C_M_RD)
ret = xilinx_xiic_read_common(dev, msg, nmsgs);