SPI irq regression

[Otavio Salvador <otavio.salvador@xxxxxxxxxxxxxxxx>]

Hi,

Since commit:

commit 01b59ce5dac856323a0c13c1d51d99a819f32efe
Author: Emil Renner Berthing <kernel@xxxxxxxx>
Date:   Wed Oct 31 11:57:09 2018 +0100

    spi: rockchip: use irq rather than polling

    Register an interrupt handler to fill/empty the
    tx and rx fifos rather than busy-looping.

    Signed-off-by: Emil Renner Berthing <kernel@xxxxxxxx>
    Tested-by: Heiko Stuebner <heiko@xxxxxxxxx>
    Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>

SPI is no longer functional on a RV1108 Elgin board.

The error messages are:

[   46.186916] spidev spi0.0: SPI transfer timed out
[   46.187435] spi_master spi0: failed to transfer one message from queue

Reverting this commit makes SPI to work again.

Any ideas on how we can properly fix this regression?

-- 
Otavio Salvador                             O.S. Systems
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