From 7ee24eb508d61e5b74dcc80f644adfb5916f7580 Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Wed, 23 Dec 2015 17:56:34 +0100 Subject: 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 Signed-off-by: Wolfram Sang Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-rcar.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) (limited to 'drivers/i2c/busses/i2c-rcar.c') diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c index 79fd2aab8fa0..e596ed9771bc 100644 --- a/drivers/i2c/busses/i2c-rcar.c +++ b/drivers/i2c/busses/i2c-rcar.c @@ -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; -- cgit