i2c: rcar: rework hw init
We don't need to init HW before every transfer since we know the HW
state then. HW init at probe time is enough. While here, add setting the
clock register which belongs to init HW. Also, set MDBS bit since not
setting it is prohibited according to the manual.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index d8361da..877ce97 100644
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -144,9 +144,10 @@
{
/* reset master mode */
rcar_i2c_write(priv, ICMIER, 0);
- rcar_i2c_write(priv, ICMCR, 0);
+ rcar_i2c_write(priv, ICMCR, MDBS);
rcar_i2c_write(priv, ICMSR, 0);
- rcar_i2c_write(priv, ICMAR, 0);
+ /* start clock */
+ rcar_i2c_write(priv, ICCCR, priv->icccr);
}
static int rcar_i2c_bus_barrier(struct rcar_i2c_priv *priv)
@@ -495,16 +496,6 @@
pm_runtime_get_sync(dev);
- /*-------------- spin lock -----------------*/
- spin_lock_irqsave(&priv->lock, flags);
-
- rcar_i2c_init(priv);
- /* start clock */
- rcar_i2c_write(priv, ICCCR, priv->icccr);
-
- spin_unlock_irqrestore(&priv->lock, flags);
- /*-------------- spin unlock -----------------*/
-
ret = rcar_i2c_bus_barrier(priv);
if (ret < 0)
goto out;
@@ -669,6 +660,8 @@
if (IS_ERR(priv->io))
return PTR_ERR(priv->io);
+ rcar_i2c_init(priv);
+
irq = platform_get_irq(pdev, 0);
init_waitqueue_head(&priv->wait);
spin_lock_init(&priv->lock);