Re: [PATCH] spi/dw_spi: add a FIFO depth detection

[Jean-Hugues Deschenes <jean-hugues.deschenes-YGVykHU+fedBDgjK7y7TUQ@public.gmane.org>]

Feng Tang wrote:
> +
> +	/*
> +	 * Try to detect the FIFO depth if not set by interface driver,
> +	 * the depth could be from 2 to 256 from HW spec
> +	 */
> +	if (!dws->fifo_len) {
> +		u32 fifo;
> +		for (fifo = 2; fifo <= 257; fifo++) {
> +			dw_writew(dws, txfltr, fifo);
> +			if (fifo != dw_readw(dws, txfltr))
> +				break;
> +		}
> +
> +		dws->fifo_len = (fifo == 257) ? 0 : fifo;
> +		dw_writew(dws, txfltr, 0);
> +	}
>  }
>  
>  int __devinit dw_spi_add_host(struct dw_spi *dws)
>   
Just what I was looking for; thanks!

Acked-by: Jean-Hugues Deschenes <jean-hugues.deschenes-YGVykHU+fedBDgjK7y7TUQ@public.gmane.org>





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