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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>
This commit is contained in:
Wolfram Sang 2015-09-03 22:20:05 +02:00 committed by Wolfram Sang
parent 049e6dde7e
commit 93c659d820
1 changed files with 5 additions and 12 deletions
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17
drivers/i2c/busses/i2c-rcar.c
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@ -144,9 +144,10 @@ static void rcar_i2c_init(struct rcar_i2c_priv *priv)
{
/* 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 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
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 @@ static int rcar_i2c_probe(struct platform_device *pdev)
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);