> Reproduction test:
> 1. Add udelay(1) after disabling ICDMAER. (It is expected to
> generate an interrupt of rcar_i2c_irq())
>
> void rcar_i2c_dma_unmap(struct rcar_i2c_priv *priv)
> {
> ...
> rcar_i2c_write(priv, ICDMAER, 0);
> udelay(1); <-- Add this line
For the record (and self-documentation): I needed to increase the delay
and was using usleep_range(500, 800) in the end.
> ...
> priv->dma_direction = DMA_NONE;
> }
>
> 2. Execute DMA transfer.
> Performs DMA transfer of read or write. In the sample, write was used.
>
> $ i2cset -y -f 4 0x6a 0x01 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 i
And I used this command instead to make sure another message is waiting:
$ i2ctransfer -y 4 w9@0x6a 1 1+ r16
Yet, in general, I could reproduce that this patch fixes the issue, so
all is fine, I think.
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