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i2c: rcar: check bus state before reinitializing

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We should check the bus state before reinitializing the IP core.
Otherwise, the internal bus busy state which also tracks multi-master
activity is lost.

Credits go to the Renesas BSP team for suggesting this change.

Reported-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Fixes: ae481cc139 ("i2c: rcar: fix resume by always initializing registers before transfer")
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Wolfram Sang 2018-11-13 12:15:42 +01:00 committed by Wolfram Sang
parent 39129f28c9
commit 0b57436f15
1 changed files with 5 additions and 4 deletions
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9
drivers/i2c/busses/i2c-rcar.c
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@ -779,6 +779,11 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
pm_runtime_get_sync(dev);
/* Check bus state before init otherwise bus busy info will be lost */
ret = rcar_i2c_bus_barrier(priv);
if (ret < 0)
goto out;
/* Gen3 needs a reset before allowing RXDMA once */
if (priv->devtype == I2C_RCAR_GEN3) {
priv->flags |= ID_P_NO_RXDMA;
@ -791,10 +796,6 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
rcar_i2c_init(priv);
ret = rcar_i2c_bus_barrier(priv);
if (ret < 0)
goto out;
for (i = 0; i < num; i++)
rcar_i2c_request_dma(priv, msgs + i);