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i2c: rcar: fix resume by always initializing registers before transfer

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commit ae481cc139658e89eb3ea671dd00b67bd87f01a3 upstream.

Resume failed because of uninitialized registers. Instead of adding a
resume callback, we simply initialize registers before every transfer.
This lightweight change is more robust and will keep us safe if we ever
need support for power domains or dynamic frequency changes.

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>
Cc: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wolfram Sang 2017-04-18 20:38:35 +02:00 committed by Greg Kroah-Hartman
parent 8d33a08bd4
commit 2aa465dbe2
1 changed files with 2 additions and 1 deletions
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3
drivers/i2c/busses/i2c-rcar.c
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@ -484,6 +484,8 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
pm_runtime_get_sync(dev);
rcar_i2c_init(priv);
ret = rcar_i2c_bus_barrier(priv);
if (ret < 0)
goto out;
@ -624,7 +626,6 @@ static int rcar_i2c_probe(struct platform_device *pdev)
if (ret < 0)
goto out_pm_put;
rcar_i2c_init(priv);
pm_runtime_put(dev);
irq = platform_get_irq(pdev, 0);