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i2c: rcar: disable PM in multi-master mode

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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;