Hi, mostly looking good...
> +#define IMX_I2C_DMA_THRESHOLD 16
Have you guessed or measured this value? A comment about this value
would be nice.
>
> +struct imx_i2c_dma {
> + struct dma_chan *chan_tx;
> + struct dma_chan *chan_rx;
> + struct dma_chan *chan_using;
> + struct completion cmd_complete;
> + dma_addr_t dma_buf;
> + unsigned int dma_len;
> + unsigned int dma_transfer_dir;
> + unsigned int dma_data_dir;
Please use proper types as there are things like 'enum
dma_data_direction' and the likes...
> + dmaengine_submit(txdesc);
This can fail, too. Use dma_submit_error() to check.
> + result = wait_for_completion_interruptible_timeout(
> + &i2c_imx->dma->cmd_complete,
> + msecs_to_jiffies(IMX_I2C_DMA_TIMEOUT));
Have you tested signals extensively? I can't really recommend the
_intrruptible_ here. I don't see any cleaning up to get the bus to a
consistent state again. Most people drop the interruptible sooner or
later.
> + /* Init DMA config if support*/
> + i2c_imx_dma_request(i2c_imx, phy_addr);
Make this function void? DMA is optional anyhow.
Thanks,
Wolfram
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