tree 7f51e793d1829c68fa7ead0c8c8ab947f2d416c6
parent 72a07a5e07c948d5a519138c351267766d29e764
author Wolfram Sang <wsa+renesas@sang-engineering.com> 1530218738 +0200
committer Simon Horman <horms+renesas@verge.net.au> 1533799550 +0200

i2c: rcar: handle RXDMA HW behaviour on Gen3

On Gen3, we can only do RXDMA once per transfer reliably. For that, we
must reset the device, then we can have RXDMA once. This patch
implements this. When there is no reset controller or the reset fails,
RXDMA will be blocked completely. Otherwise, it will be disabled after
the first RXDMA transfer. Based on a commit from the BSP by Hiromitsu
Yamasaki, yet completely refactored to handle multiple read messages
within one transfer.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
(cherry picked from commit 2b16fd63059ab9a46d473620749672dc342e1d21)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>