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i2c: rcar: check bus free before first message

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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@sang-engineering.com>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Wolfram Sang 2014-05-28 09:44:40 +02:00 committed by Wolfram Sang
parent f2382249b2
commit 3f7de22eb2
1 changed files with 5 additions and 11 deletions
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16
drivers/i2c/busses/i2c-rcar.c
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@ -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)