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authorWolfram Sang <wsa+renesas@sang-engineering.com>2015-09-03 22:20:05 +0200
committerWolfram Sang <wsa@the-dreams.de>2015-10-09 22:29:28 +0100
commit93c659d820ef291f6ca5e628f44b26cfb2226aba (patch)
treeda6a8f48c8dd17ea6ef721a4a360fac958898db6 /drivers/i2c
parent049e6dde7e57f0054fdc49102e7ef4830c698b46 (diff)
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>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-rcar.c17
1 files changed, 5 insertions, 12 deletions
diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index d8361dada584..877ce97ac7a5 100644
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -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);