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i2c: at91_i2c: Wait for TXRDY after sending the first byte

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The driver must wait for TXRDY after each byte is pushed into
the i2c FIFO before pushing the next byte. Previously this was
not done for the first byte, causing a race condition with zeros
sometimes being sent for the next byte (which is typically the
first actual data byte).

Signed-off-by: Alan Ott <alan@softiron.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Alan Ott 2017-11-28 22:25:23 -05:00 • committed by Heiko Schocher
parent 50a69095cb
commit 0afbb0e1c0
1 changed files with 2 additions and 0 deletions
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drivers/i2c/at91_i2c.c
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@ -72,6 +72,8 @@ static int at91_i2c_xfer_msg(struct at91_i2c_bus *bus, struct i2c_msg *msg)
} else {
writel(msg->buf[0], &reg->thr);
ret = at91_wait_for_xfer(bus, TWI_SR_TXRDY);
for (i = 1; !ret && (i < msg->len); i++) {
writel(msg->buf[i], &reg->thr);
ret = at91_wait_for_xfer(bus, TWI_SR_TXRDY);