[ Upstream commit 0b57436f15bf40e432487086c4f2d01fd3529393 ]

We should check the bus state before reinitializing the IP core.
Otherwise, the internal bus busy state which also tracks multi-master
activity is lost.

Credits go to the Renesas BSP team for suggesting this change.
Reported-by: NYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Fixes: ae481cc1 ("i2c: rcar: fix resume by always initializing registers before transfer")
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>
Signed-off-by: NSasha Levin <sashal@kernel.org>