i2c: rcar: handle RXDMA HW behaviour on Gen3

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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

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Wolfram Sang 2018-06-28 22:45:38 +02:00 • committed by Wolfram Sang

parent 9f9e3e0d4d

commit 2b16fd6305

1 changed files with 51 additions and 3 deletions

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drivers/i2c/busses/i2c-rcar.c

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