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    Subject[PATCH] i2c: rk3x: fix 0 length write transfers
    Date
    i2cdetect -q was broken (everything was a false positive, and no transfers were
    actually being sent over i2c). The way it works is by sending a 0 length write
    request and checking for NACK. This patch fixes the 0 length writes and actually
    sends them.

    Reported-by: Doug Anderson <dianders@chromium.org>
    Signed-off-by: Alexandru M Stan <amstan@chromium.org>
    ---
    drivers/i2c/busses/i2c-rk3x.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/drivers/i2c/busses/i2c-rk3x.c b/drivers/i2c/busses/i2c-rk3x.c
    index b41d979..f486d0e 100644
    --- a/drivers/i2c/busses/i2c-rk3x.c
    +++ b/drivers/i2c/busses/i2c-rk3x.c
    @@ -238,7 +238,7 @@ static void rk3x_i2c_fill_transmit_buf(struct rk3x_i2c *i2c)
    for (i = 0; i < 8; ++i) {
    val = 0;
    for (j = 0; j < 4; ++j) {
    - if (i2c->processed == i2c->msg->len)
    + if ((i2c->processed == i2c->msg->len) && (cnt != 0))
    break;

    if (i2c->processed == 0 && cnt == 0)
    --
    2.1.0.rc2.206.gedb03e5


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