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i2c: rcar: disable PM in multi-master mode 

In multi master mode, the IP core needs to be always active for
arbitration reasons. Get the config from DT and set up PM depending on
the config.

Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
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 2015-12-23 17:56:34 +01:00 committed by Wolfram Sang
parent 42c0783b89
commit 7ee24eb508
1 changed files with 14 additions and 3 deletions
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17
drivers/i2c/busses/i2c-rcar.c
View File

@ -96,6 +96,9 @@
#define ID_DONE (1 << 2)
#define ID_ARBLOST (1 << 3)
#define ID_NACK (1 << 4)
/* persistent flags */
#define ID_P_PM_BLOCKED (1 << 31)
#define ID_P_MASK ID_P_PM_BLOCKED
enum rcar_i2c_type {
I2C_RCAR_GEN1,
@ -277,7 +280,7 @@ static void rcar_i2c_next_msg(struct rcar_i2c_priv *priv)
{
priv->msg++;
priv->msgs_left--;
priv->flags = 0;
priv->flags &= ID_P_MASK;
rcar_i2c_prepare_msg(priv);
}
@ -495,7 +498,7 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
/* init first message */
priv->msg = msgs;
priv->msgs_left = num;
priv->flags = ID_FIRST_MSG;
priv->flags = (priv->flags & ID_P_MASK) | ID_FIRST_MSG;
rcar_i2c_prepare_msg(priv);
time_left = wait_event_timeout(priv->wait, priv->flags & ID_DONE,
@ -630,7 +633,13 @@ static int rcar_i2c_probe(struct platform_device *pdev)
goto out_pm_put;
rcar_i2c_init(priv);
pm_runtime_put(dev);
/* Don't suspend when multi-master to keep arbitration working */
if (of_property_read_bool(dev->of_node, "multi-master"))
priv->flags |= ID_P_PM_BLOCKED;
else
pm_runtime_put(dev);
irq = platform_get_irq(pdev, 0);
ret = devm_request_irq(dev, irq, rcar_i2c_irq, 0, dev_name(dev), priv);
@ -664,6 +673,8 @@ static int rcar_i2c_remove(struct platform_device *pdev)
struct device *dev = &pdev->dev;
i2c_del_adapter(&priv->adap);
if (priv->flags & ID_P_PM_BLOCKED)
pm_runtime_put(dev);
pm_runtime_disable(dev);
return 0;