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i2c: rcar: clarify PM handling with more comments 

PM handling is correct but might be a bit subtle. Add some comments for
clarification.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Wolfram Sang 2017-04-20 12:04:33 +02:00 committed by Wolfram Sang
parent ae481cc139
commit 63a761eef5
1 changed files with 3 additions and 1 deletions
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4
drivers/i2c/busses/i2c-rcar.c
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@ -753,6 +753,7 @@ static int rcar_reg_slave(struct i2c_client *slave)
if (slave->flags & I2C_CLIENT_TEN)
return -EAFNOSUPPORT;
/* Keep device active for slave address detection logic */
pm_runtime_get_sync(rcar_i2c_priv_to_dev(priv));
priv->slave = slave;
@ -856,13 +857,14 @@ static int rcar_i2c_probe(struct platform_device *pdev)
priv->dma_direction = DMA_NONE;
priv->dma_rx = priv->dma_tx = ERR_PTR(-EPROBE_DEFER);
/* Activate device for clock calculation */
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);
ret = rcar_i2c_clock_calculate(priv, &i2c_t);
if (ret < 0)
goto out_pm_put;
/* Don't suspend when multi-master to keep arbitration working */
/* Stay always active when multi-master to keep arbitration working */
if (of_property_read_bool(dev->of_node, "multi-master"))
priv->flags |= ID_P_PM_BLOCKED;
else