From: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
We should always check if the bus is free, independently if it is a read
or write. It should be done before the first message, though. After
that, we ourselves keep the bus busy. Remove a 'ret' assignment which
only silenced a build warning.
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
drivers/i2c/busses/i2c-rcar.c | 16 +++++-----------
1 file changed, 5 insertions(+), 11 deletions(-)
diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index 9757adf33f37..a97a14955ddf 100644
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -294,15 +294,6 @@ static int rcar_i2c_recv(struct rcar_i2c_priv *priv)
static int rcar_i2c_send(struct rcar_i2c_priv *priv)
{
- int ret;
-
- /*
- * It should check bus status when send case
- */
- ret = rcar_i2c_bus_barrier(priv);
- if (ret < 0)
- return ret;
-
rcar_i2c_set_addr(priv, 0);
rcar_i2c_status_clear(priv);
rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_START);
@@ -508,7 +499,10 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
spin_unlock_irqrestore(&priv->lock, flags);
/*-------------- spin unlock -----------------*/
- ret = -EINVAL;
+ ret = rcar_i2c_bus_barrier(priv);
+ if (ret < 0)
+ goto out;
+
for (i = 0; i < num; i++) {
/* This HW can't send STOP after address phase */
if (msgs[i].len == 0) {
@@ -569,7 +563,7 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
ret = i + 1; /* The number of transfer */
}
-
+out:
pm_runtime_put(dev);
if (ret < 0 && ret != -ENXIO)
--
2.0.0.rc2
--
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