4.9-stable review patch. If anyone has any objections, please let me know.
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From: Wolfram Sang wsa+renesas@sang-engineering.com
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
--- drivers/i2c/busses/i2c-rcar.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/i2c/busses/i2c-rcar.c +++ b/drivers/i2c/busses/i2c-rcar.c @@ -700,6 +700,8 @@ static int rcar_i2c_master_xfer(struct i
pm_runtime_get_sync(dev);
+ rcar_i2c_init(priv); + ret = rcar_i2c_bus_barrier(priv); if (ret < 0) goto out; @@ -857,8 +859,6 @@ static int rcar_i2c_probe(struct platfor if (ret < 0) goto out_pm_put;
- rcar_i2c_init(priv); - /* 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;