Initially, we only needed a reset controller to make sure RXDMA works at
least once per transfer. Meanwhile, documentation has been updated. It
now says that a reset has to be performed prior every transaction, even
if it is non-DMA. So, make the reset controller a requirement instead of
being optional. And bail out if resetting fails.
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
Change since v1:
* bail out when resetting fails (Thanks, Geert!)
drivers/i2c/busses/i2c-rcar.c | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)
diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index 5e97635faf78..bb4fc66309c2 100644
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -838,12 +838,10 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
/* Gen3 needs a reset before allowing RXDMA once */
if (priv->devtype == I2C_RCAR_GEN3) {
- priv->flags |= ID_P_NO_RXDMA;
- if (!IS_ERR(priv->rstc)) {
- ret = rcar_i2c_do_reset(priv);
- if (ret == 0)
- priv->flags &= ~ID_P_NO_RXDMA;
- }
+ priv->flags &= ~ID_P_NO_RXDMA;
+ ret = rcar_i2c_do_reset(priv);
+ if (ret)
+ return ret;
}
rcar_i2c_init(priv);
@@ -1096,11 +1094,13 @@ static int rcar_i2c_probe(struct platform_device *pdev)
if (priv->devtype == I2C_RCAR_GEN3) {
priv->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
- if (!IS_ERR(priv->rstc)) {
- ret = reset_control_status(priv->rstc);
- if (ret < 0)
- priv->rstc = ERR_PTR(-ENOTSUPP);
- }
+ if (IS_ERR(priv->rstc))
+ return dev_err_probe(&pdev->dev, PTR_ERR(priv->rstc),
+ "couldn't get reset");
+
+ ret = reset_control_status(priv->rstc);
+ if (ret < 0)
+ return ret;
}
/* Stay always active when multi-master to keep arbitration working */
--
2.35.1
